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2020-04-23 | Chandra High Energy Transmission Gratings Spectra of V3890 Sgr | The recurrent nova (RN) V3890 Sgr was observed during the 7th day after the
onset of its most recent outburst, with the Chandra ACIS-S camera and High
Energy Transmission Gratings (HETG). A rich emission line spectrum was
detected, due to transitions of Fe-L and K-shell ions ranging from neon to
iron. The measured abso... | 2004.11263v2 |
2020-05-19 | ARES II: Characterising the Hot Jupiters WASP-127 b, WASP-79 b and WASP-62 b with HST | This paper presents the atmospheric characterisation of three large, gaseous
planets: WASP-127b, WASP-79b and WASP-62b. We analysed spectroscopic data
obtained with the G141 grism (1.088 - 1.68 $\mu$m) of the Wide Field Camera 3
(WFC3) onboard the Hubble Space Telescope (HST) using the Iraclis pipeline and
the TauREx3 ... | 2005.09615v2 |
2020-05-29 | Cold, dry, windy, and UV irradiated -- surveying Mars relevant conditions in Ojos del Salado Volcano (Andes Mountains, Chile) | The Special Collection of papers in this issue of Astrobiology provide an
overview of the characteristics and potential for future exploration of the
Ojos del Salado volcano, located in the Andes Mountains in front of the Atacama
Desert in northern Chile. The main benefits of this site compared with others
are the comb... | 2005.14450v1 |
2020-06-05 | Chemically peculiar A and F stars with enhanced s-process and iron-peak elements: stellar radiative acceleration at work | We present $\gtrsim 15,000$ metal-rich (${\rm [Fe/H]}>-0.2$dex) A and F stars
whose surface abundances deviate strongly from Solar abundance ratios and
cannot plausibly reflect their birth material composition. These stars are
identified by their high [Ba/Fe] abundance ratios (${\rm [Ba/Fe]}>1.0$dex) in
the LAMOST DR5 ... | 2006.03329v1 |
2020-06-29 | Impact of the returning radiation on the analysis of the reflection spectra of black holes | A fraction of the electromagnetic radiation emitted from the surface of a
geometrically thin and optically thick accretion disk of a black hole returns
to the disk because of the strong light bending in the vicinity of the compact
object (returning radiation). While such radiation clearly affects the observed
spectrum ... | 2006.15838v2 |
2020-07-02 | Iron in X-COP: tracing enrichment in cluster outskirts with high accuracy abundance profiles | We present the first metal abundance profiles for a representative sample of
massive clusters. Our measures extend to $R_{500}$ and are corrected for a
systematic error plaguing previous outskirt estimates. Our profiles flatten out
at large radii, admittedly not a new result, however the radial range and
representative... | 2007.01084v1 |
2020-07-21 | Unveiling the Planet Population at Birth | The radius distribution of small, close-in exoplanets has recently been shown
to be bimodal. The photoevaporation model predicted this bimodality. In the
photoevaporation scenario, some planets are completely stripped of their
primordial H/He atmospheres, whereas others retain them. Comparisons between
the photoevapora... | 2007.11006v2 |
2020-07-24 | The Most Metal-poor Stars in the Inner Bulge | The bulge is the oldest component of the Milky Way. Since numerous
simulations of Milky Way formation have predicted that the oldest stars at a
given metallicity are found on tightly bound orbits, the Galaxy's oldest stars
are likely metal-poor stars in the inner bulge with small apocenters (i.e.,
$R_{\mathrm{apo}}\les... | 2007.12728v1 |
2021-02-01 | Connecting the Light Curves of Type IIP Supernovae to the Properties of their Progenitors | Observations of core-collapse supernovae (CCSNe) reveal a wealth of
information about the dynamics of the supernova ejecta and its composition but
very little direct information about the progenitor. Constraining properties of
the progenitor and the explosion requires coupling the observations with a
theoretical model ... | 2102.01118v2 |
2021-06-09 | Turbulent transport of impurities in 3D devices | A large diffusive turbulent contribution to the radial impurity transport in
Wendelstein 7-X (W7-X) plasmas has been experimentally inferred during the
first campaigns and numerically confirmed by means of gyrokinetic simulations
with the code stella. In general, the absence of strong impurity accumulation
during the i... | 2106.05017v2 |
2021-06-21 | Correlations Among STM Observables in Disordered Unconventional Superconductors | New developments in scanning tunneling spectroscopy now allow for the
spatially resolved measurement of the Josephson critical current $I_c$ between
a tip and a superconducting sample, a nearly direct measurement of the true
superconducting order parameter. However, it is unclear how these $I_c$
measurements are correl... | 2106.11091v2 |
2021-06-24 | X-ray Emission of the $γ$-ray Loud Young Radio Galaxy NGC 3894 | The radio source 1146+596 is hosted by an elliptical/S0 galaxy NGC\,3894,
with a low-luminosity active nucleus. The radio structure is compact,
suggesting a very young age of the jets in the system. Recently, the source has
been confirmed as a high-energy (HE, $>0.1$\,GeV) $\gamma$-ray emitter, in the
most recent accum... | 2106.13193v2 |
2021-06-30 | The Inhomogeneity of Composition along the Magnetic Cloud Axis | It is generally accepted that CMEs result from eruptions of magnetic flux
ropes, which are dubbed as magnetic clouds in interplanetary space. The
composition (including the ionic charge states and elemental abundances) is
determined prior to and/or during CME eruptions in the solar atmosphere, and
does not alter during... | 2106.15834v1 |
2021-06-30 | Spectroscopy and photometry of the least-massive Type-II globular clusters: NGC1261 AND NGC6934 | Recent work has revealed two classes of Globular Clusters (GCs), dubbed
Type-I and Type-II. Type-II GCs are characterized by a blue- and a red- red
giant branch composed of stars with different metallicities, often coupled with
distinct abundances in the slow-neutron capture elements (s-elements). Here we
continue the ... | 2106.15978v1 |
2021-07-02 | Ti I lines at 2.2 $μ$m as probes of the cool parts of sunspots | The sunspot umbra harbors the coolest plasma on the solar surface due to the
presence of strong magnetic fields. The routinely used atomic lines to observe
the photosphere have weak signals in the umbra and are often swamped by
molecular lines. This makes it harder to infer the properties of the umbra,
especially in th... | 2107.01247v1 |
2022-07-23 | Data Adaptive Regularization for Abdominal Quantitative Susceptibility Mapping | Purpose: To improve repeatability and reproducibility across acquisition
parameters and reduce bias in quantitative susceptibility mapping (QSM) of the
liver, through development of an optimized regularized reconstruction algorithm
for abdominal QSM.
Theory and Methods: An optimized approach to estimation of magnetic... | 2207.11416v1 |
2022-07-27 | The breakdown of both strange metal and superconducting states at a pressure-induced quantum critical point in iron-pnictide superconductors | The strange metal (SM) state, characterized by a linear-in-temperature
resistivity, is often seen in the normal state of high temperature
superconductors. It is believed that the SM state is one of the keys to
understand the underlying mechanism of high-Tc superconductivity. Here we
report the first observation of the ... | 2207.13272v2 |
2017-05-29 | Baby MIND: A magnetized segmented neutrino detector for the WAGASCI experiment | T2K (Tokai-to-Kamioka) is a long-baseline neutrino experiment in Japan
designed to study various parameters of neutrino oscillations. A near detector
complex (ND280) is located 280~m downstream of the production target and
measures neutrino beam parameters before any oscillations occur. ND280's
measurements are used to... | 1705.10406v3 |
2017-06-15 | $η$ Carinae's Dusty Homunculus Nebula from Near-Infrared to Submillimeter Wavelengths: Mass, Composition, and Evidence for Fading Opacity | Infrared observations of the dusty, massive Homunculus Nebula around the
luminous blue variable $\eta$ Carinae are crucial to characterize the mass-loss
history and help constrain the mechanisms leading to the Great Eruption. We
present the 2.4 - 670 $\mu$m spectral energy distribution, constructed from
legacy ISO obse... | 1706.05112v1 |
2017-06-29 | X-shooter spectroscopy of young stellar objects in Lupus: Lithium, iron, and barium elemental abundances | With the purpose of performing a homogeneous determination of elemental
abundances for members of the Lupus T association, we analyzed three chemical
elements: lithium, iron, and barium. The aims were: to derive the Li abundance
for ~90% of known class II stars in the Lupus I, II, III, IV clouds; to perform
chemical ta... | 1706.09684v1 |
2018-02-02 | Spectral Evidence for Amorphous Silicates in Least-processed CO Meteorites and Their Parent Bodies | Least-processed carbonaceous chondrites (carbonaceous chondrites that have
experienced minimal aqueous alteration and thermal metamorphism) are
characterized by their predominately amorphous iron-rich silicate
interchondrule matrices and chondrule rims. The presence of abundant amorphous
material in a meteorite indicat... | 1802.00830v1 |
2018-02-08 | Orbital Origin of Extremely Anisotropic Superconducting Gap in Nematic Phase of FeSe Superconductor | The iron-based superconductors are characterized by multiple-orbital physics
where all the five Fe 3$d$ orbitals get involved. The multiple-orbital nature
gives rise to various novel phenomena like orbital-selective Mott transition,
nematicity and orbital fluctuation that provide a new route for realizing
superconducti... | 1802.02940v1 |
2018-02-13 | Probing the use of spectroscopy to determine the meteoritic analogues of meteors | Determining the source regions of meteorites is one of the major goals of
current research in planetary science. Whereas asteroid observations are
currently unable to pinpoint the source regions of most meteorite classes,
observations of meteors with camera networks and the subsequent recovery of the
meteorite may help... | 1802.04699v2 |
2018-02-14 | Hydrodynamical Neutron-star Kicks in Electron-capture Supernovae and Implications for the CRAB Supernova | Neutron stars (NSs) obtain kicks of typically several 100 km/s at birth. The
gravitational tug-boat mechanism can explain these kicks as consequences of
asymmetric mass ejection during the supernova (SN) explosion. Support for this
hydrodynamic explanation is provided by observations of SN remnants with
associated NSs,... | 1802.05274v2 |
2018-02-21 | Can the relativistic light bending model explain X-ray spectral variations of Seyfert galaxies? | Many Seyfert galaxies are known to exhibit Fe-K broad emission line features
in their X-ray energy spectra. The observed lines have three distinct features;
(1) the line profiles are skewed and show significant low-energy tails, (2) the
Fe-K band have low variability, which produces a broad and deep dip in the
root-mea... | 1802.07554v2 |
2018-02-21 | Broad absorption line symbiotic stars: highly ionized species in the fast outflow from MWC 560 | In symbiotic binaries, jets and disk winds may be integral to the physics of
accretion onto white dwarfs from cool giants. The persistent outflow from
symbiotic star MWC 560 (=V694 Mon) is known to manifest as broad absorption
lines (BALs), most prominently at the Balmer transitions. We report the
detection of high-ion... | 1802.07743v2 |
2018-02-28 | Late metal-silicate separation on the IAB parent asteroid: Constraints from combined W and Pt isotopes and thermal modelling | The short-lived $^{182}$Hf-$^{182}$W decay system is a powerful chronometer
for constraining the timing of metal-silicate separation and core formation in
planetesimals and planets. Neutron capture effects on W isotopes, however,
significantly hamper the application of this tool. In order to correct for
neutron capture... | 1802.10421v1 |
2018-07-05 | V902 Monocerotis: a likely disc-accreting intermediate polar | Aims: We aim to confirm whether the eclipsing cataclysmic variable V902 Mon
is an Intermediate Polar, to characterise its X-ray spectrum and flux, and to
refine its orbital ephemeris and spin period. Methods: We performed
spectrographic observations of V902 Mon in 2016 with the 2.2m Calar Alto
telescope, and X-ray phot... | 1807.01981v1 |
2018-07-05 | Mineralogy, structure and habitability of carbon-enriched rocky exoplanets: A laboratory approach | Carbon-enriched rocky exoplanets have been proposed around dwarf stars as
well as around binary stars, white dwarfs and pulsars. However, the
mineralogical make up of such planets is poorly constrained. We performed
high-pressure high-temperature laboratory experiments ($P$ = 1$-$2 GPa, $T$ =
1523$-$1823 K) on carbon-e... | 1807.02064v2 |
2018-07-10 | X-shooting GRBs at high redshift: probing dust production history | Evolved asymptotic giant branch (AGB) stars and Type Ia supernovae (SNe) are
important contributors to the elements that form dust in the interstellar
medium of galaxies, in particular, carbon and iron. However, they require at
least a Gyr to start producing these elements, therefore, a change in dust
quantity or prope... | 1807.03597v1 |
2018-07-18 | Optical dimming of RW Aur associated with an iron rich corona and exceptionally high absorbing column density | RW Aur is a binary system composed of two young, low-mass stars. The primary,
RW Aur A, has undergone visual dimming events ($\Delta V =2-3$~mag) in 2011,
2014-16, and 2017-2018. Visual and IR observations indicate a gray absorber
that moved into the line-of-sight. This dimming is also associated with changes
in the ou... | 1807.06995v1 |
2018-07-25 | APOGEE Data Releases 13 and 14: Stellar Parameter and Abundance Comparisons With Independent Analyses | Data from the SDSS-IV / Apache Point Observatory Galactic Evolution
Experiment (APOGEE-2) have been released as part of SDSS Data Releases 13
(DR13) and 14 (DR14). These include high resolution H-band spectra, radial
velocities, and derived stellar parameters and abundances. DR13, released in
August 2016, contained APO... | 1807.09784v1 |
2018-08-01 | Nebular-phase spectra of superluminous supernovae: physical insights from observational and statistical properties | We study the spectroscopic evolution of superluminous supernovae (SLSNe)
later than 100 days after maximum light. We present new data for Gaia16apd and
SN2017egm, and analyse these with a larger sample comprising 41 spectra of 12
events. The spectra become nebular within 2-4 $e$-folding times after light
curve peak, wi... | 1808.00510v2 |
2018-10-24 | Fe I in the Beta Pictoris circumstellar gas disk. II. The time variations in the iron circumstellar gas | Beta Pictoris is a young planetary system surrounded by a debris disk of dust
and gas. The gas source of this disk could be exocomets (or 'falling and
evaporating bodies', FEBs), which produce refractory elements (Mg, Ca, Fe)
through sublimation of dust grains at several tens of stellar radii. Nearly
1700 high resoluti... | 1810.10421v1 |
2019-01-17 | Emergence of Superconductivity from Fully Incoherent Normal State in an Iron-Based Superconductor (Ba$_{0.6}$K$_{0.4}$)Fe$_2$As$_2$ | In unconventional superconductors, it is generally believed that
understanding the physical properties of the normal state is a pre-requisite
for understanding the superconductivity mechanism. In conventional
superconductors like niobium or lead, the normal state is a Fermi liquid with a
well-defined Fermi surface and ... | 1901.05693v1 |
2019-01-24 | Anisotropic magnetic excitations and incipient Néel order in Ba(Fe$_{1-x}$Mn$_{x}$)$_{2}$As$_{2}$ | It is currently understood that high temperature superconductivity (SC) in
the transition metal $(M)$ substituted iron arsenides
Ba(Fe$_{1-x}$$M$$_{x}$)$_{2}$As$_{2}$ is promoted by magnetic excitations with
wave vectors $(\pi,0)$ or $(0,\pi)$. It is known that while a small amount of
Co substitution leads to SC, the s... | 1901.08543v3 |
2019-04-09 | CsMn$_4$As$_3$: A layered tetragonal transition-metal pnictide compound with antiferromagnetic ground state | We report the synthesis and properties of a new layered tetragonal ternary
compound CsMn$_4$As$_3$ (structure: KCu$_4$S$_3$-type, space group: $P4/mmm$,
No. 123 and $Z = 2$). The material is a small band-gap semiconductor and
exhibits an antiferromagnetic ground state associated with Mn spins. The
compound exhibits a s... | 1904.04598v1 |
2019-04-09 | Insulating Parent Phase and Distinct Doping Evolution to Superconductivity in Single-Layer FeSe/SrTiO3 Films | The single-layer FeSe/SrTiO3 (FeSe/STO) films have attracted much attention
because of their simple crystal structure, distinct electronic structure and
record high superconducting transition temperature (Tc). The origin of the
dramatic Tc enhancement in single-layer FeSe/STO films and the dichotomy of
superconductivit... | 1904.04662v1 |
2019-06-19 | Iron abundance distribution in the hot gas of merging galaxy clusters | We present XMM-Newton/EPIC observations of six merging galaxy clusters and
study the distributions of their temperature, iron (Fe) abundance and
pseudo-entropy along the merging axis. For the first time, we focus
simultaneously, and in a comprehensive way, on the chemical and thermodynamic
properties of the freshly col... | 1906.08067v1 |
2019-07-02 | Neutron star mergers and rare core-collapse supernovae as sources of r-process enrichment in simulated galaxies | We use cosmological, magnetohydrodynamical simulations of Milky Way-mass
galaxies from the Auriga project to study their enrichment with rapid neutron
capture (r-process) elements. We implement a variety of enrichment models from
both binary neutron star mergers and rare core-collapse supernovae. We focus on
the abunda... | 1907.01557v2 |
2019-07-17 | Heavy metals in intermediate He-rich hot subdwarfs: The chemical composition of HZ44 and HD127493 | Hot subluminous stars can be spectroscopically classified as subdwarf B (sdB)
and O (sdO) stars. While the latter are predominantly hydrogen deficient, the
former are mostly helium deficient. The atmospheres of most sdOs are almost
devoid of hydrogen, whereas a small group of hot subdwarf stars of mixed H/He
compositio... | 1907.07781v1 |
2019-07-29 | Turbulence and Rotation in Solar-Type Stars | Stellar spectra with a high resolution of 115000 obtained with the HARPS
spectrograph provide an opportunity to examine turbulence velocities and their
depth distributions in the photosphere of stars. Fourier analysis was performed
for 17 iron lines in the spectra of 13 stars with an effective temperature of
4900--6200... | 1907.12241v1 |
2019-10-07 | Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr$_\mathbf{0.67}$Na$_\mathbf{0.33}$Fe$_\mathbf{2}$As$_\mathbf{2}$ | We report the temperature-dependent optical conductivity and ARPES studies of
the iron-based superconductor (SC) Sr$_{0.67}$Na$_{0.33}$Fe$_2$As$_2$ in the
high-temperature tetragonal paramagnetic phase; below the structural and
magnetic transitions at $T_{\rm N}\simeq$125 K in the orthorhombic
spin-density-wave (SDW)-l... | 1910.02927v2 |
2019-10-28 | Type Ia Supernova Explosions from Hybrid Carbon-Oxygen-Neon White Dwarf Progenitors That Have Mixed During Cooling | The creation of "hybrid" white dwarfs, made of a C-O core within a O-Ne shell
has been proposed, and studies indicate that ignition in the C-rich central
region makes these viable progenitors for thermonuclear (type Ia) supernovae.
Recent work found that the C-O core is mixed with the surrounding O-Ne as the
white dwar... | 1910.12403v1 |
2019-12-15 | The influence of NLTE effects in Fe I lines on an inverted atmosphere I. 6301 A and 6302 A lines formed in 1D NLTE | Ultraviolet over-ionisation of iron atoms in the solar atmosphere leads to
deviations in their level populations from the Saha-Boltzmann statistics. This
causes their line profiles to form in Non-Local Thermodynamic Equilibrium
(NLTE) conditions. While inverting such profiles to determine atmospheric
parameters, the NL... | 1912.07007v2 |
2020-03-06 | Studying the Reflection Spectra of the New Black Hole X-ray Binary Candidate MAXI J1631-479 Observed by NuSTAR: A Variable Broad Iron Line Profile | We present results from the Nuclear Spectroscopic Telescope Array (NuSTAR)
observations of the new black hole X-ray binary candidate MAXI J1631-479 at two
epochs during its 2018-2019 outburst, which caught the source in a disk
dominant state and a power-law dominant state. Strong relativistic disk
reflection features a... | 2003.03465v1 |
2020-08-04 | The infancy of core-collapse supernova remnants | We present 3D hydrodynamic simulations of neutrino-driven supernovae (SNe)
with the PROMETHEUS-HOTB code, evolving the asymmetrically expanding ejecta
from shock breakout until they reach the homologous expansion phase after
roughly one year. Our calculations continue the simulations for two red
supergiant (RSG) and tw... | 2008.01763v2 |
2020-08-13 | On the detection of surface spin freezing in iron oxide nanoparticles and its long-term evolution under ambient oxidation | Exchange bias effects linked to surface spin freezing (SSF) are commonly
found in iron oxide nanoparticles, while signatures of SSF in low-field
temperature-dependent magnetization curves have been much less frequently
reported. Here, we present magnetic properties of dense assemblies of
similar-sized (~ 8 nm diameter)... | 2008.05874v1 |
2020-08-31 | Structural, magnetic and electronic properties of CaBaCo4-xMxO7 (M= Fe, Zn) | The effect of substituting iron and zinc for cobalt in CaBaCo$_4$O$_7$ has
been investigated using neutron diffraction and x-ray absorption spectroscopy.
The orthorhombic distortion present in the parent compound CaBaCo$_4$O$_7$
decreases with increasing the content of either Fe or Zn. The samples
CaBaCo$_3$ZnO$_7$ and... | 2008.13649v1 |
2020-10-14 | The X-SHOOTER/ALMA sample of Quasars in the Epoch of Reionization. I. NIR spectral modeling, iron enrichment and broad emission line properties | We present X-SHOOTER near-infrared spectroscopy of a large sample of 38
luminous ($M_{1450}=-29.0$ to $-24.4$) quasars at $5.78<z<7.54$, which have
complementary CII observations from ALMA. This X-SHOOTER/ALMA sample provides
us with the most comprehensive view of reionization-era quasars to date,
allowing us to connec... | 2010.06902v1 |
2020-10-21 | Composition and origin of L5 Trojan asteroids of Mars: Insights from spectroscopy | We investigate the mineralogy of L5 Martian Trojan asteroids via reflectance
spectroscopy, in particular (101429) 1998 $\mbox{VF}_{31}$, the only L5 Trojan
that does not belong to the Eureka family (Christou, 2013). We find that this
asteroid most likely belongs to the Bus-Demeo S-complex, in agreement with
Rivkin et a... | 2010.10947v1 |
2020-10-29 | Spectroscopic Evidence of Superconductivity Pairing at 83 K in Single-Layer FeSe/SrTiO3 Films | Single-layer FeSe films grown on the SrTiO3 substrate (FeSe/STO) have
attracted much attention because of their possible record-high superconducting
critical temperature Tc and distinct electronic structures in iron-based
superconductors. However, it has been under debate on how high its Tc can
really reach due to the ... | 2010.15362v1 |
2020-11-03 | Discovery of a Fast Iron Low-ionization Outflow in the Early Evolution of the Nearby Tidal Disruption Event AT2019qiz | We report the results of ultraviolet (UV) and optical photometric and
spectroscopic analysis of the tidal disruption event (TDE) AT2019qiz. Our
follow-up observations started $<$10 days after the source began to brighten in
the optical and lasted for a period of six months. Our late-time host-dominated
spectrum indicat... | 2011.01593v2 |
2020-11-15 | Three-dimensional Supernova Models Provide New Insights into the Origins of Stardust | We present the isotope yields of two post-explosion, three-dimensional 15
$M_\odot$ core-collapse supernova models, 15S and 15A, and compare them to the
carbon, nitrogen, silicon, aluminum, sulfur, calcium, titanium, iron, and
nickel isotopic compositions of SiC stardust. We find that these core-collapse
supernova mode... | 2011.07459v2 |
2020-11-25 | Light Quantum Control of Persisting Higgs Modes in Iron-Based Superconductors | The Higgs mechanism, i.e., spontaneous symmetry breaking of the quantum
vacuum, is a cross-disciplinary principle, universal for understanding dark
energy, antimatter and quantum materials, from superconductivity to magnetism.
Yet, Higgs modes in one-band superconductors (SCs) are currently under debate
due to their co... | 2011.13036v2 |
2020-11-27 | XMM-Newton observations of the extremely X-ray luminous quasar CFHQS J142952+544717=SRGE J142952.1+544716 at redshift z=6.18 | We present results from a 20 ks XMM-Newton DDT observation of the radio-load
quasar CFHQS J142952+544717 at z=6.18, whose extreme X-ray luminosity was
recently revealed by the SRG/eROSITA telescope in the course of its first
all-sky survey. The quasar has been confidently detected with a total of $\sim
1400$ net counts... | 2011.13724v2 |
2020-12-02 | Synthesis and Characterization of Sodium Iron Antimonate Na2FeSbO5 One-Dimensional Antiferromagnetic Chain Compound with a Spin Glass Ground State | A new oxide, sodium iron antimonate, Na2FeSbO5, was synthesized and
structurally characterized, and its static and dynamic magnetic properties were
comprehensively studied both experimentally by dc and ac magnetic
susceptibility, magnetization, specific heat, electron spin resonance (ESR) and
Moessbauer measurements, a... | 2012.01106v1 |
2021-01-02 | Influence of NLTE effects in Fe I lines on inverted atmosphere II. 6301 A and 6302 A lines formed in 3DNLTE | This paper forms the second part of our study on how the neglect of NLTE
conditions in the formation of Fe I 6301.5 A and the 6302.5 A lines influences
the atmosphere obtained by inverting their profiles in LTE. The main cause of
NLTE effects is the line opacity deficit due to the excess ionization of the Fe
I atoms by... | 2101.00506v1 |
2021-01-24 | Exploring the diversity of double detonation explosions for type Ia supernovae: Effects of the post-explosion helium shell composition | The detonation of a helium shell on top of a carbon-oxygen white dwarf has
been argued as a potential explosion mechanism for type Ia supernovae (SNe~Ia).
The ash produced during helium shell burning can lead to light curves and
spectra that are inconsistent with normal SNe~Ia, but may be viable for some
objects showin... | 2101.09792v1 |
2021-03-12 | Chemical analysis of the Bulge Globular Cluster NGC 6553 | Globular Clusters are among the oldest objects in the Galaxy, thus their
researchers are key to understanding the processes of evolution and formation
that the galaxy has experienced in early stages. Spectroscopic studies allow us
to carry out detailed analyzes on the chemical composition of Globular
Clusters. The aim ... | 2103.07014v1 |
2021-04-03 | Genuine Electronic Structure and Superconducting Gap Structure in (Ba$_{0.6}$K$_{0.4}$)Fe$_{2}$As$_{2}$ Superconductor | The electronic structure and superconducting gap structure are prerequisites
to establish microscopic theories in understanding the superconductivity
mechanism of iron-based superconductors. However, even for the most extensively
studied optimally-doped (Ba$_{0.6}$K$_{0.4}$)Fe$_2$As$_2$, there remain
outstanding contro... | 2104.01407v1 |
2021-05-04 | The Effect of Geometry, Spin and Orbital Optimization in Achieving Accurate, Fully-Correlated Results for Iron-Sulfur Cubanes | Iron-sulfur clusters comprise an important functional motif of the catalytic
centers of biological systems, capable of enabling important chemical
transformations at ambient conditions. This remarkable capability derives from
a notoriously complex electronic structure that is characterized by a high
density of states t... | 2105.01754v2 |
2021-05-10 | Cloud busting: enstatite and quartz clouds in the atmosphere of 2M2224-0158 | We present the most detailed data-driven exploration of cloud opacity in a
substellar object to-date. We have tested over 60 combinations of cloud
composition and structure, particle size distribution, scattering model, and
gas phase composition assumptions against archival $1-15 {\rm \mu m}$
spectroscopy for the unusu... | 2105.04268v1 |
2021-05-13 | Near-Room-Temperature Ferromagnetic Behavior of Single-Atom-Thick 2D Iron in Nanolaminated Ternary MAX Phases | Two dimensional (2D) ferromagnetic materials have attracted much attention in
the fields of condensed matter physics and materials science, but their
synthesis is still a challenge given their limitations on structural stability
and susceptibility to oxidization. MAX phases nanolaminated ternary carbides or
nitrides po... | 2105.06139v1 |
2021-05-26 | Magnetic Particle Spectroscopy (MPS) with One-stage Lock-in Implementation for Magnetic Bioassays with Improved Sensitivities | In recent years, magnetic particle spectroscopy (MPS) has become a highly
sensitive and versatile sensing technique for quantitative bioassays. It relies
on the dynamic magnetic responses of magnetic nanoparticles (MNPs) for the
detection of target analytes in liquid phase. There are many research studies
reporting the... | 2105.12718v1 |
2021-09-13 | The stellar mass versus stellar metallicity relation of star-forming galaxies at $1.6\le z\le3.0$ and implications for the evolution of the $α$-enhancement | We measure the relationship between stellar mass and stellar metallicity, the
stellar mass--metallicity relation (MZR), for 1336 star-forming galaxies at
$1.6\le z\le3.0$ (<z>=2.2) using rest-frame far-ultraviolet spectra from the
zCOSMOS-deep survey. High signal-to-noise composite spectra containing stellar
absorption... | 2109.06044v1 |
2021-09-28 | Stable nickel production in Type Ia supernovae: A smoking gun for the progenitor mass? | At present, there are strong indications that white dwarf (WD) stars with
masses well below the Chandrasekhar limit (MCh ~ 1.4 Msun) contribute a
significant fraction of SN Ia progenitors. The relative fraction of stable
iron-group elements synthesized in the explosion has been suggested as a
possible discriminant betw... | 2109.13840v3 |
2021-10-17 | The iron and oxygen content of LMC Classical Cepheids and its implications for the Extragalactic Distance Scale and Hubble constant | Classical Cepheids are primary distance indicators and a crucial stepping
stone to determining the present-day Hubble constant Ho to the precision and
accuracy required to constrain apparent deviations from the LCDM Concordance
Cosmological Model. We have measured the iron and oxygen abundances of of 89
Cepheids in the... | 2110.08860v2 |
2022-01-05 | Phase-resolved spectroscopy of a quasi-periodic oscillation in the black hole X-ray binary GRS 1915+105 with NICER and NuSTAR | Quasi-periodic oscillations (QPOs) are often present in the X-ray flux from
accreting stellar-mass black holes (BHs). If they are due to relativistic
(Lense-Thirring) precession of an inner accretion flow which is misaligned with
the disc, the iron emission line caused by irradiation of the disc by the inner
flow will ... | 2201.01765v1 |
2022-01-24 | Formation of Zn and Pb sulfides in a redox-sensitive modern system due to high atmospheric fallout | The study shows that the air-derived metal enrichment (up to 2.3 g Zn kg-1,
1.1 g Pb kg-1, and 62 mg Cd kg-1) is retained in a thin layer (~30 cm) around
10-15 cm below the peat surface. A combination of focused ion beam (FIB)
technology and scanning (SEM) and transmission (TEM) electron microscopy
reveals that microme... | 2201.09552v1 |
2022-02-14 | Giant Impact onto a Vesta-Like Asteroid and Formation of Mesosiderites through Mixing of Metallic Core and Surface Crust | Mesosiderites are a type of stony-iron meteorites composed of a mixture of
silicates and Fe-Ni metals. The mesosiderite silicates and metals are
considered to have originated from the crust and metal core, respectively, of a
differentiated asteroid. In contrast, mesosiderites rarely contain the olivine
that is mainly i... | 2202.06486v1 |
2022-02-16 | Spin Seebeck effect in iron oxide thin films: Effects of phase transition, phase coexistence, and surface magnetism | Understanding impacts of phase transition, phase coexistence, and surface
magnetism on the longitudinal spin Seebeck effect (LSSE) in a magnetic system
is essential to manipulate the spin to charge current conversion efficiency for
spincaloritronic applications. We aim to elucidate these effects by performing
a compreh... | 2202.07910v1 |
2022-02-16 | A new and homogeneous metallicity scale for Galactic classical Cepheids II. The abundance of iron and alpha elements | Classical Cepheids are the most popular distance indicators and tracers of
young stellar populations. The key advantage is that they are bright and they
can be easily identified in Local Group and Local Volume galaxies. Their
evolutionary and pulsation properties depend on their chemical abundances. The
main aim of thi... | 2202.07945v1 |
2022-03-01 | Low-luminosity type IIP supernovae: SN 2005cs and SN 2020cxd as very low-energy iron core-collapse explosions | SN 2020cxd is a representative of the family of low-energy, underluminous
Type IIP supernovae (SNe), whose observations and analysis were recently
reported by Yang et al. (2021). Here we re-evaluate the observational data for
the diagnostic SN properties by employing the hydrodynamic explosion model of a
9 MSun red sup... | 2203.00473v2 |
2022-03-06 | Coupling between the accreting corona and the relativistic jet in the micro quasar GRS 1915+105 | GRS 1915+105 was the first stellar-mass black-hole in our Galaxy to display a
superluminal radio jet, similar to those observed in active galactic nuclei
with a supermassive black hole at the centre. It has been proposed that the
radio emission in GRS 1915+105 is fed by instabilities in the accretion disc by
which the ... | 2203.02963v1 |
2022-03-07 | The in situ origin of the globular cluster NGC 6388 from abundances of Sc, V, and Zn of a large sample of stars | Chemical tagging of globular clusters (GCs) is often done using abundances of
alpha-elements. The iron-peak elements Sc, V, and in particular Zn were
proposed as an alternative to alpha-elements to tag accreted GCs in the
metal-rich regime, where the dwarf galaxy Sagittarius and its GCs show
peculiarly marked under-abu... | 2203.03645v1 |
2022-03-22 | Co-loading of doxorubicin and iron oxide nanocubes in polycaprolactone fibers for combining Magneto-Thermal and chemotherapeutic effects on cancer cells | Among the strategies to fight cancer, multi-therapeutic approaches are
considered as a wise choice to put in place multiple weapons to suppress
tumors. In this work, to combine chemotherapeutic effects to magnetic
hyperthermia when using biocompatible scaffolds, we have established an
electrospinning method to produce ... | 2203.12380v1 |
2022-03-23 | Prospects of measuring a metallicity trend and spread in globular clusters from low-resolution spectroscopy | The metallicity spread, or the metallicity trend along the evolutionary
sequence of a globular cluster, is a rich source of information to help
understand the cluster physics (e.g. multiple populations) and stellar physics
(e.g. atomic diffusion). Low-resolution integral-field-unit spectroscopy in the
optical with the ... | 2203.12685v1 |
2022-03-30 | The p-process in exploding rotating massive stars | The p-process nucleosynthesis can explain proton-rich isotopes that are
heavier than iron, which are observed in the Solar System, but discrepancies
still persist and important questions concerning the astrophysical site(s) of
the p-process remain unanswered. We investigate how the p-process operates in
exploding rotat... | 2203.16380v1 |
2022-04-11 | The GAPS Programme at TNG XXXIII. HARPS-N detects multiple atomic species in emission from the dayside of KELT-20b | The detection of lines in emission in planetary atmospheres provides direct
evidence of temperature inversion. We confirm the trend of ultra-hot Jupiters
orbiting A-type stars showing temperature inversions on their daysides, by
detecting metals emission lines in the dayside of KELT-20b. We first detect the
planetary e... | 2204.04948v1 |
2022-05-19 | Nuclear Weak Rates and Nuclear Weak Processes in Stars | Nuclear weak rates in stellar environments are obtained by shell-model
calculations including Gamow-Teller (GT) and spin-dipole transitions, and
applied to nuclear weak processes in stars. The important roles of accurate
weak rates for the study of astrophysical processes are pointed out. The weak
rates in $sd$-shell a... | 2205.09262v2 |
2022-06-29 | Does the Fe L-shell blend bias abundance measurements in intermediate-temperature clusters? | In intermediate-temperature (T = 2.5 - 4.5 keV) galaxy clusters, abundance
measurements are almost-equally driven by Fe K and L transitions, at $\sim$ 6.7
keV and 0.9 - 1.3 keV, respectively. While K-shell-derived measurements are
considered reliable, the resolution of the currently available instrumentation,
as well a... | 2206.14827v1 |
2022-08-08 | The chemical abundance pattern of the extremely metal-poor thin disk star 2MASS J1808-5104 and its origins | We present a high-resolution ($R\sim35,000$), high signal-to-noise
($S/N=350$) Magellan/MIKE spectrum of the bright extremely metal-poor star
2MASS~J1808$-$5104. We find [Fe/H] = $-$4.01 (spectroscopic LTE stellar
parameters), [Fe/H] = $-$3.8 (photometric stellar parameters), [Fe/H] = $-$3.7
(spectroscopic NLTE stellar... | 2208.03891v1 |
2022-09-02 | An intermediate polar candidate toward the Galactic plane | For the past decade, it has been suggested that intermediate polars (IPs), a
subclass of magnetic cataclysmic variables (CVs), are one of the main
contributors to the hard diffuse X-ray emission from the Galactic center (GC)
and Galactic ridge. In our ongoing \emph{XMM-Newton} survey of the central
region of the Galact... | 2209.00970v1 |
2022-09-12 | 53Mn-53Cr chronology and ε54Cr-Δ17O genealogy of Erg Chech 002: the oldest andesite in the Solar System | The meteorite sample Erg Chech (EC) 002 is the oldest felsic igneous rock
from the Solar System analysed to date and provides a unique opportunity to
study the formation of felsic crusts on differentiated protoplanets immediately
after metal-silicate equilibration or core formation. The extinct 53Mn-53Cr
chronometer pr... | 2209.05381v1 |
2022-09-13 | The Puzzle of Meteoritic Minerals Heideite and Brezinaite; Are they Iron-based Superconductors? Are they Technosignatures? | Transition metal sulfides (Fe, V)3S4 and (Fe, Ti)3S4, with the monoclinic
Cr3S4 type structure have been studied for a long time, itinerant magnetism in
form of Spin density waves (SDW) have been found in these systems with
different features as evidenced by 57Fe Mossbauer Spectroscopy, there is an
intricate relationsh... | 2209.05679v1 |
2022-10-11 | Ironing the folds: The phase space chevrons of a GSE-like merger as a dark matter subhalo detector | Recent work uncovered features in the phase space of the Milky Way's stellar
halo which may be attributed to the last major merger. When stellar material
from a satellite is accreted onto its host, it phase mixes and appears finely
substructured in phase space. For a high-eccentricity merger, this substructure
most cle... | 2210.05679v2 |
2022-10-13 | TOI-561 b: A Low Density Ultra-Short Period "Rocky" Planet around a Metal-Poor Star | TOI-561 is a galactic thick disk star hosting an ultra-short period (0.45 day
orbit) planet with a radius of 1.37 R$_{\oplus}$, making it one of the most
metal-poor ([Fe/H] = -0.41) and oldest ($\sim$10 Gyr) sites where an
Earth-sized planet has been found. We present new simultaneous radial velocity
measurements (RVs)... | 2210.06665v3 |
2022-10-14 | The homogeneity of chemical abundances in H II regions of the Magellanic Clouds | We use very deep spectra obtained with the Ultraviolet-Visual Echelle
Spectrograph at the Very Large Telescope to derive physical conditions and
chemical abundances of four H II regions of the Large Magellanic Cloud (LMC)
and four H II regions of the Small Magellanic Cloud (SMC). The observations
cover the spectral ran... | 2210.07460v1 |
2022-11-11 | The unaltered pulsar: GRO J1750-27, a super-critical X-ray neutron star that does not blink an eye | When accreting X-ray pulsars (XRPs) undergo bright X-ray outbursts, their
luminosity-dependent spectral and timing features can be analysed in detail.
The XRP GRO J1750-27 recently underwent one of such episodes, during which it
was observed with $NuSTAR$ and monitored with $NICER$. Such a data set is
rarely available,... | 2211.06367v2 |
2022-12-01 | Three dimensional magnetorotational core-collapse supernova explosions of a 39 solar mass progenitor star | We perform three-dimensional simulations of magnetorotational supernovae
using a $39\,M_{\odot}$ progenitor star with two different initial magnetic
field strengths of $10^{10}$ G and $10^{12}$ G in the core. Both models rapidly
undergo shock revival and their explosion energies asymptote within a few
hundred milliseco... | 2212.00200v3 |
2022-12-12 | Systematic Broad-band X-ray Study of super-Eddington Accretion onto Supermassive Black Holes. I. X-ray Continuum | We present the first systematic broad-band X-ray study of super-Eddington
accretion onto SMBHs with simultaneous {\it NuSTAR} and {\it XMM-Newton} or
{\it Swift}/XRT observations of a sample of 8 super-Eddington accreting AGN
with Eddington ratio $1<\lambda_{\rm Edd}<426$. We find that the SEAMBHs show a
steep primary ... | 2212.06183v1 |
2022-12-15 | Non-trivial band topology and orbital-selective electronic nematicity in a new titanium-based kagome superconductor | Electronic nematicity that spontaneously breaks rotational symmetry has been
shown as a generic phenomenon in correlated quantum systems including
high-temperature superconductors and the AV3Sb5 (A = K, Rb, Cs) family with a
kagome network. Identifying the driving force has been a central challenge for
understanding ne... | 2212.07958v1 |
2023-01-20 | The chemical DNA of the Magellanic Clouds -- I. The chemical composition of 206 Small Magellanic Cloud red giant stars | We present the chemical composition of 206 red giant branch stars members of
the Small Magellanic Cloud (SMC) using optical, high-resolution spectra
collected with the multi-object spectrograph FLAMES-GIRAFFE at the ESO Very
Large Telescope. This sample includes stars in three fields located in
different positions with... | 2301.08758v1 |
2023-01-30 | The Hubble/STIS Near-ultraviolet Transmission Spectrum of HD 189733b | The benchmark hot Jupiter HD 189733b has been a key target to lay out the
foundations of comparative planetology for giant exoplanets. As such, HD
189733b has been extensively studied across the electromagnetic spectrum. Here,
we report the observation and analysis of three transit light curves of HD
189733b obtained w... | 2301.13025v1 |
2023-01-30 | A Catalog of 71 Coronal Line Galaxies in MaNGA: [NeV] is an Effective AGN Tracer | Despite the importance of AGN in galaxy evolution, accurate AGN
identification is often challenging, as common AGN diagnostics can be confused
by contributions from star formation and other effects (e.g.,
Baldwin-Phillips-Terlevich diagrams). However, one promising avenue for
identifying AGNs are ``coronal emission lin... | 2301.13322v1 |
2023-02-09 | Chaotic winds from a dying world: a one-dimensional map for evolving atmospheres | Planets which are smaller than Mercury and heated to sublimation temperatures
of $\sim$2000 K lose mass catastrophically in dusty evaporative winds. The
winds are observed to gust and recede largely without pattern; transit depths
from the Kepler mission vary randomly from orbit to orbit by up to a factor of
10 or more... | 2302.04898v2 |
2023-03-02 | Concurrent Ferromagnetism and Superconductivity in Fe(Te,Se) van der Waals Josephson Junctions | Ferromagnetism and superconductivity are two key ingredients to create
non-Abelian quasiparticle excitations that are expected as building blocks to
construct topological quantum computers. Adversely, ferromagnetism and
superconductivity are typically also two hostile orderings competing to align
spins in different con... | 2303.00966v2 |
2023-03-19 | $\rm Li_x(C_5H_5N)_yFe_{2-z}Se_2$: a defect resilient expanded-lattice high-temperature superconductor | Two-dimensional iron-chalcogenide intercalates display a remarkable
correlation of the interlayer spacing with the enhancement of the
superconducting critical temperature ($T_c$). In this work, synchrotron x-ray
absorption ($XAS$, at Fe and Se K edges) and emission ($XES$) spectroscopies,
allow to discuss how the impor... | 2303.10716v1 |
2023-05-02 | Lunar Mantle Structure and Composition Inferred From Apollo 12 -- Explorer 35 Electromagnetic Sounding | Constraints on the interior of the Moon have been derived from its inductive
response, principally as measured by the magnetic transfer function (TF)
between the distantly orbiting Explorer 35 satellite and the Apollo 12 surface
station. The most successful prior studies used a dataset spanning 0.01-1 mHz,
so the lunar... | 2305.01462v2 |
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