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Evolutionary status of W Vir pulsating variables: Stellar evolution calculations for population II stars with initial
composition $Y_0=0.25$, $Z_0=10^{-3}$ and the initial stellar mass $M_0 =
0.82M_\odot$ were carried out from the main sequence to the white dwarf stage.
Twelve AGB and post--AGB evolutionary sequences w... | astro-ph |
COSMIC RAYS FROM ACCRETING ISOLATED NEUTRON STARS: Interstellar matter that is accreted onto isolated magnetic neutron stars in
the Galaxy ($\sim 10^9$ by number) is accelerated and reflected back by MHD
shocks, which envelope the stars. The integrated power in the Galaxy
$L_{cr,ns}$ is $ \sgreat 10^{40} {\rm erg \ s^{... | astro-ph |
Systematic differences in simple stellar population model results:
Application to the M31 globular-like cluster system: Simple stellar population (SSP) synthesis models are useful tools for
studying the nature of unresolved star clusters in external galaxies. However,
the plethora of currently available SSP models gi... | astro-ph |
Dark Matter Halos in Galaxies and Globular Cluster Populations: We combine a new, comprehensive database for globular cluster populations in
all types of galaxies with a new calibration of galaxy halo masses based
entirely on weak lensing. Correlating these two sets of data, we find that the
mass ratio $\eta \equiv M_{... | astro-ph |
Ultraviolet C II and Si III Transit Spectroscopy and Modeling of the
Evaporating Atmosphere of GJ436b: Hydrogen gas evaporating from the atmosphere of the hot-Neptune GJ436b
absorbs over 50% of the stellar Ly$\alpha$ emission during transit. Given the
planet's atmospheric composition and energy-limited escape rate, t... | astro-ph |
How Spatially Resolved Polarimetry Informs Black Hole Accretion Flow
Models: The Event Horizon Telescope (EHT) Collaboration has successfully produced
images of two supermassive black holes, enabling novel tests of black holes and
their accretion flows on horizon scales. The EHT has so far published total
intensity a... | astro-ph |
Modeling the Mass Distribution in Spiral Galaxies: We use deep r-band photometry and Halpha rotation curves for a sample of 290
late-type spirals to model their mass distribution within the optical radius.
We examine luminosity profile decompositions into bulge and disk carefully and
confirm that bulge light is best mo... | astro-ph |
Yet another UFO in the X-ray spectrum of a high-z lensed QSO: Ultra-fast outflows (UFO) appear to be common in local active galactic nuclei
(AGN) and may be powerful enough ($\dot{E}_{kin}$$\geq$1\% of L$_{bol}$) to
effectively quench the star formation in their host galaxies. To test feedback
models based on AGN outfl... | astro-ph |
MUCHFUSS - Massive Unseen Companions to Hot Faint Underluminous Stars
from SDSS: The project Massive Unseen Companions to Hot Faint Underluminous Stars from
SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact
companions (white dwarfs with masses $M>1.0 {\rm M_{\odot}}$, neutron stars or
black hole... | astro-ph |
Electron Acceleration at Rippled Low-Mach-number Shocks in High-beta
Collisionless Cosmic Plasmas: Using large-scale fully-kinetic two-dimensional particle-in-cell simulations,
we investigate the effects of shock rippling on electron acceleration at
low-Mach-number shocks propagating in high-$\beta$ plasmas, in appli... | astro-ph |
Analysis of the Data from Compton X-ray Polarimeters which Measure the
Azimuthal and Polar Scattering Angles: X-ray polarimetry has the potential to make key-contributions to our
understanding of galactic compact objects like binary black hole systems and
neutron stars, and extragalactic objects like active galactic ... | astro-ph |
Periodograms for Multiband Astronomical Time Series: This paper introduces the multiband periodogram, a general extension of the
well-known Lomb-Scargle approach for detecting periodic signals in time-domain
data. In addition to advantages of the Lomb-Scargle method such as treatment of
non-uniform sampling and heteros... | astro-ph |
Galaxy Formation with BECDM: I. Turbulence and relaxation of idealised
haloes: We present a theoretical analysis of some unexplored aspects of relaxed
Bose-Einstein condensate dark matter (BECDM) haloes. This type of ultralight
bosonic scalar field dark matter is a viable alternative to the standard cold
dark matter ... | astro-ph |
Neutrino spectra evolution during proto-neutron star deleptonization: The neutrino-driven wind, which occurs after the onset of a core-collapse
supernova explosion, has long been considered as the possible site for the
synthesis of heavy r-process elements in the Universe. Only recently, it has
been possible to simulat... | astro-ph |
Identifying hot subdwarf stars from photometric data using Gaussian
mixture model and graph neural network: Hot subdwarf stars are very important for understanding stellar evolution,
stellar astrophysics, and binary star systems. Identifying more such stars can
help us better understand their statistical distribution... | astro-ph |
VLA Detection of RRLs from the radio nucleus of NGC 253 : Ionization by
a weak AGN, an obscured SSC or a compact SNR ?: We have imaged the H92alpha and H75alpha radio recombination line (RRL)
emissions from the starburst galaxy NGC 253 with a resolution of ~4 pc. The
peak of the RRL emission at both frequencies coinc... | astro-ph |
The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T
Transition: We present the first results from our high-precision infrared (IR) astrometry
program at the Canada-France-Hawaii Telescope. We measure parallaxes for 83
ultracool dwarfs (spectral types M6--T9) in 49 systems, with a median
uncertaint... | astro-ph |
Quantum vacuum and accelerated expansion: A new approach to extraction of quantum vacuum energy, in the context of the
accelerated expansion, is proposed, and it is shown that experimentally
realistic orders of values can be derived. The idea has been implemented in the
framework of the Friedmann-Lemaitre-Robertson-Wal... | astro-ph |
Almost All of Kepler's Multiple Planet Candidates are Planets: We present a statistical analysis that demonstrates that the overwhelming
majority of Kepler candidate multiple transiting systems (multis) indeed
represent true, physically-associated transiting planets. Binary stars provide
the primary source of false pos... | astro-ph |
ROSAT PSPC and Hri Observations of the Composite Starburst/Seyfert 2
Galaxy NGC 1672: The nearby barred spiral galaxy NGC 1672 is thought to have a weak Seyfert
nucleus in addition to its strong starburst activity. Observations with the
PSPC and HRI instruments on board the ROSAT X-ray satellite show that three
X-ray... | astro-ph |
The Host Galaxy of GRB 060505: Host ISM Properties: We investigate the ISM environment of GRB 060505. Using optical emission-line
diagnostic ratios, we compare the ISM properties of the GRB 060505 host region
with the hosts of unambiguous long- and short-duration GRBs. We show that the
metallicity, ionization state, an... | astro-ph |
Properties of Ellipticity Correlation with Atmospheric Structure from
Gemini South: Cosmic shear holds great promise for a precision independent measurement of
$\Omega\rm_m$, the mass density of the universe relative to the critical
density. The signal is expected to be weak, so a thorough understanding of
systematic... | astro-ph |
Radiative Transfer Effect on Ultraviolet Pumping of the 21cm Line in the
High Redshift Universe: During the epoch of reionization the 21cm signal is sensitive to the
scattering rate of the ultraviolet photons, redshifting across the Lyman_alpha
resonance. Here we calculate the photon scattering rate profile for a sin... | astro-ph |
On the Efficiency of Thermal Conduction in Galaxy Clusters: Galaxy clusters host a large reservoir of diffuse plasma with
radially-varying temperature profiles. The efficiency of thermal conduction in
the intracluster medium (ICM) is complicated by the existence of turbulence and
magnetic fields, and has received a lot... | astro-ph |
Mapping the Clumpy Structures within Submillimeter Galaxies using
Laser-Guide Star Adaptive Optics Spectroscopy: We present the first integral-field spectroscopic observations of
high-redshift submillimeter-selected galaxies (SMGs) using Laser Guide Star
Adaptive Optics (LGS-AO). We target H-alpha emission of three S... | astro-ph |
Searching for an Intermediate Mass Black Hole in the Blue Compact Dwarf
galaxy MRK 996: The possibility is explored that accretion on an intermediate mass black hole
contributes to the ionisation of the interstellar medium of the Compact Blue
Dwarf galaxy MRK996. Chandra observations set tight upper limits (99.7 per ... | astro-ph |
Stability of planetary, single M dwarf, and binary star companions to
Kepler detached eclipsing binaries and a possible five body system: In this study we identify 11 Kepler systems (KIC 5255552, 5653126, 5731312,
7670617, 7821010, 8023317, 10268809, 10296163, 11519226, 11558882 and 12356914)
with a "flip-flop" effec... | astro-ph |
Dependence of fragmentation in self-gravitating accretion discs on small
scale structure: We propose a framework for understanding the fragmentation criterion for
self-gravitating discs which, in contrast to studies that emphasise the
`gravoturbulent' nature of such discs, instead focuses on the properties of
their q... | astro-ph |
Improved Weak Lensing Photometric Redshift Calibration via StratLearn
and Hierarchical Modeling: Discrepancies between cosmological parameter estimates from cosmic shear
surveys and from recent Planck cosmic microwave background measurements
challenge the ability of the highly successful $\Lambda$CDM model to describ... | astro-ph |
Topology of the Galaxy Distribution in the Hubble Deep Fields: We have studied topology of the distribution of the high redshift galaxies
identified in the Hubble Deep Field (HDF) North and South. The two-dimensional
genus is measured from the projected distributions of the HDF galaxies at
angular scales from $3.8''$ t... | astro-ph |
Numerical study of Cosmic Ray Diffusion in MHD turbulence: We study diffusion of Cosmic Rays (CRs) in turbulent magnetic fields using
test particle simulations. Electromagnetic fields are produced in direct
numerical MHD simulations of turbulence and used as an input for particle
tracing, particle feedback on turbulenc... | astro-ph |
The Galactic Plane Observed by XMM-Newton: In A0-1 we proposed an ambitious long-term survey of selected regions of our
Galaxy (the XGPS survey) using the EPIC CCD cameras on XMM-Newton. The first
phase of the programme, which aims to survey a strip of the Galactic Plane in
the Scutum region, is currently underway. Her... | astro-ph |
Possible Quasi-Periodic Oscillations from Unstable Accretion: 3D MHD
Simulations: We investigate the photometric variability of magnetized stars, particularly
neutron stars, accreting through a magnetic Rayleigh-Taylor-type instability at
the disk-magnetosphere interface, and compare it with the variability during
st... | astro-ph |
High time resolution observations of the January 2000 glitch in the Vela
pulsar: Pulsars are rotating neutron stars, sweeping the emission regions from the
magnetic poles across our line of sight. Isolated neutron stars lose angular
momentum through dipole radiation and (possibly) particle winds, hence they
slow down... | astro-ph |
Jupiter's equatorial quasi-quadrennial oscillation forced by internal
thermal forcing: Observations have shown that there exists downward propagation of alternating
westward/eastward jets in Jupiter's equatorial stratosphere, with a
quasi-period between four and six years. This phenomenon is generally called
the quas... | astro-ph |
First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations:
Preliminary Maps and Basic Results: We present full sky microwave maps in five bands (23 to 94 GHz) from the WMAP
first year sky survey. Calibration errors are <0.5% and the low systematic
error level is well specified. The 2<l<900 anisotropy power ... | astro-ph |
The SONYC survey: Towards a complete census of brown dwarfs in star
forming regions: SONYC, short for "Substellar Objects in Nearby Young Clusters", is a survey
program to provide a census of the substellar population in nearby star forming
regions. We have conducted deep optical and near-infrared photometry in five
... | astro-ph |
Evolution of the L1 halo family in the radial solar sail CRTBP: We present a detailed investigation of the dramatic changes that occur in the
$\mathcal{L}_1$ halo family when radiation pressure is introduced into the
Sun-Earth circular restricted three-body problem (CRTBP). This
photo-gravitational CRTBP can be used to... | astro-ph |
Neutrinos as a diagnostic of cosmic ray Galactic/extra-galactic
transition: Motivated by a recent change in viewing the onset of the extra-galactic
component in the cosmic ray spectrum, we have fitted the observed data down to
$10^{8.6}$ GeV and have obtained the corresponding power emissivity. This
transition energy... | astro-ph |
Unusual Burst Emission from the New Soft Gamma Repeater SGR1627-41: In June-July,1998 the Konus-Wind burst spectrometer observed a series of
bursts from the new soft gamma repeater SGR1627-41. Time histories and energy
spectra of the bursts have been studied, revealing fluences and peak fluxes in
the ranges of 3x10^{-7... | astro-ph |
On the Particle Acceleration Mechanisms in a Double Radio Relic Galaxy
Cluster, Abell 1240: We present a 368 ks deep Chandra observation of Abell~1240, a binary merging
galaxy cluster at a redshift of 0.195 with two Brightest Cluster Galaxies
(BCGs) may have passed each other 0.3 Gyr ago. Building upon previous
inves... | astro-ph |
Thermal structure and cooling of neutron stars with magnetized envelopes: The thermal structure of neutron stars with magnetized envelopes is studied
using modern physics input. The relation between the internal (T_i) and local
surface temperatures is calculated and fitted by analytic expressions for
magnetic field str... | astro-ph |
The ALHAMBRA survey: an empirical estimation of the cosmic variance for
merger fraction studies based on close pairs: Our goal is to estimate empirically, for the first time, the cosmic variance
that affects merger fraction studies based on close pairs. We compute the
merger fraction from photometric redshift close p... | astro-ph |
Signatures of a Maxwellian Component in Shock-Accelerated Electrons in
GRBs: Recent particle-in-cell simulations suggest that a large fraction of the
energy dissipated in a relativistic shock is deposited into a Maxwellian
distribution of electrons that is connected to the high-energy power-law tail.
Here, we explore... | astro-ph |
Nonlinear cascades in two-dimensional turbulent magnetoconvection: The dynamics of spectral transport in two-dimensional turbulent convection of
electrically conducting fluids is studied by means of direct numerical
simulations (DNS) in the frame of the magnetohydrodynamic (MHD) Boussinesq
approximation. The system per... | astro-ph |
The Greater Taurus-Auriga Ecosystem I: There Is A Distributed Older
Population: The Taurus-Auriga association and its associated molecular cloud are a
benchmark population for studies of star and planet formation. The census of
Taurus-Auriga has been assembled over seven decades and has inherited the
biases, incomple... | astro-ph |
A Swift Fix II: Physical Parameters of Type I Superluminous Supernovae: In November 2020, the Swift team announced a major update to the calibration
of the UltraViolet and Optical Telescope (UVOT) data to correct for the gradual
loss of sensitivity over time. Beginning in roughly 2015, the correction
affected observati... | astro-ph |
The Evolution and Star Formation History of M33: We construct a parameterized model to explore the main properties of the star
formation history of M33. We assume that the disk originates and grows by the
primordial gas infall and adopt the simple form of gas accretion rate with one
free parameter, the infall time-scal... | astro-ph |
HAT-P-47b AND HAT-P-48b: Two Low Density Sub-Saturn-Mass Transiting
Planets on the Edge of the Period--Mass Desert: We report the discovery of two new transiting extrasolar planets orbiting
moderately bright (V = 10.7 and 12.2 mag) F stars (masses of 1.39 Msun and 1.10
Msun, respectively). The planets have periods of... | astro-ph |
X-ray Reverberation Observational Modelling in Active Galactic Nuclei: X-ray reverberation in Active Galactic Nuclei, believed to be the result of
the reprocessing of coronal photons by the underlying accretion disc, has
allowed us to probe the properties of the inner-most regions of the accretion
flow and the central ... | astro-ph |
A Viscous Heating Mechanism for the Hot Plasma in the Galactic Center
Region: In addition to lines originating in a soft phase at ~0.8 keV and to cold
molecular clouds, the X-ray spectra from the Galactic center region also
exhibit properties similar to those of a diffuse, thin, very hot plasma at 8
keV on a scale of... | astro-ph |
Cosmological parameters from the comparison of peculiar velocities with
predictions from the 2M++ density field: Peculiar velocity measurements are the only tool available in the
low-redshift Universe for mapping the large-scale distribution of matter and
can thus be used to constrain cosmology. Using redshifts from ... | astro-ph |
Multi-band optical variability of the Blazar S5 0716+714 in outburst
state during 2014-2015: We analyzed the multi-band optical behaviour of the BL Lacertae object, S5
0716+714, during its outburst state from 2014 November - 2015 March. We took
data on 23 nights at three observatories, one in India and two in Bulgari... | astro-ph |
Red-Sequence Galaxies at High Redshift by the COMBO-17+4 Survey: We investigate the evolution of the galaxy population since redshift 2 with a
focus on the colour bimodality and mass density of the red sequence. We obtain
precise and reliable photometric redshifts up to z=2 by supplementing the
optical survey COMBO-17 ... | astro-ph |
The DRAO Synthesis Telescope: The DRAO Synthesis Telescope (ST) is a forefront telescope for imaging
large-scale neutral hydrogen and polarized radio continuum emission at
arcminute resolution. Equipped for observations at 1420 and 408 MHz, the ST
completed the Canadian Galactic Plane Survey, providing pioneering measu... | astro-ph |
Solar Activity and Space Weather: After providing an overview of solar activity as measured by the sunspot
number (SSN) and space weather events during solar cycles (SCs) 21-24, we focus
on the weak solar activity in SC 24. The weak solar activity reduces the number
of energetic eruptions from the Sun and hence the num... | astro-ph |
Strong stellar-driven outflows shape the evolution of galaxies at cosmic
dawn: We study galaxy mass assembly and cosmic star formation rate (SFR) at
high-redshift (z$\gt$4), by comparing data from multiwavelength surveys with
predictions from the GAlaxy Evolution and Assembly (GAEA) model. GAEA
implements a stellar f... | astro-ph |
Calibrating Galaxy Redshifts Using Absorption by the Surrounding
Intergalactic Medium: Rest-frame UV spectral lines of star-forming galaxies are systematically
offset from the galaxies' systemic redshifts, probably because of large-scale
outflows. We calibrate galaxy redshifts measured from rest-frame UV lines by
uti... | astro-ph |
Stimulated Raman scattering of water maser lines in astrophysical
plasmas: Radiative transfer equations are derived and solved for the stimulated Raman
scattering of water maser lines in the astrophysical plasmas with electron
density of about 10^6 - 10^7 cm-3. In stimulated Raman scattering, the energy
of water mase... | astro-ph |
Tomography of the environment of the COSMOS/AzTEC-3 submillimeter galaxy
at z=5.3 revealed by Lyalpha and MUSE observations: We study the members of the protocluster around AzTEC3 submillimeter galaxy
at z=5.3. We analyzed the data from the MUSE instrument in an area of 1.4x1.4
arcmin^2 around AzTEC3 and derived info... | astro-ph |
Accretion by the Secondary in Eta Carinae During the Spectroscopic
Event: I. Flow Parameters: We examine the influence of the gravity of the companion (the secondary) to
the massive primary star Eta Carinae on the winds blown by the primary and the
secondary. The two winds collide with each other after passing throug... | astro-ph |
Wetter Stratospheres on High Obliquity Planets: We investigate how obliquity affects stratospheric humidity using a 3D
general circulation model and find the stratosphere under high obliquity could
be over 3 orders of magnitude moister than under the low obliquity equivalent,
even with the same global annual mean surfa... | astro-ph |
Diagnostic of the temperature and differential emission measure (DEM)
based on Hinode/XRT data: We discuss here various methodologies and an optimal strategy of the
temperature and emission measure diagnostics based on Hinode X-Ray Telescope
data. As an example of our results we present determination of the temperatu... | astro-ph |
Special point on the mass radius diagram of hybrid stars: An analytical study that explains the existence of a very small region on the
mass radius diagram of hybrid stars where all of the lines representing the
sequences of models with different constant values of the bag constant B
intersect is presented. This circum... | astro-ph |
Common envelope events with low-mass giants: understanding the energy
budget: Common envelope events are important interactions between two binary stars
that lead to the formation of close binary systems. We present here a
systematic three-dimensional study in which we model common envelope events
with low-mass giant... | astro-ph |
Detecting and interpreting statistical lensing by absorbers: We propose a method for detecting gravitational magnification of distant
sources, like quasars, due to absorber systems detected in their spectra. We
first motivate the use of metal absorption lines rather than Lyman-alpha lines,
then we show how to relate th... | astro-ph |
Uncertainties in the Galactic dark matter distribution: an update: We present here a quantitative, accurate estimate of the impact of
uncertainties of astrophysical nature on the determination of the dark matter
distribution within our Galaxy, the Milky Way. Based on an update of a previous
analysis, this work is motiv... | astro-ph |
A Time-Efficient, Data Driven Modelling Approach For Predicting The
Geomagnetic Impact of Coronal Mass Ejections: To understand the global-scale physical processes behind coronal mass
ejection (CME)-driven geomagnetic storms and predict their intensity as a space
weather forecasting measure, we develop an interplanet... | astro-ph |
Generation of large-scale magnetic fields due to fluctuating $α$ in
shearing systems: We explore the growth of large-scale magnetic fields in a shear flow, due to
helicity fluctuations with a finite correlation time, through a study of the
Kraichnan-Moffatt model of zero-mean stochastic fluctuations of the $\alpha$
p... | astro-ph |
A Comparison of the UV and HI Properties of the Extended UV (XUV) Disk
Galaxies NGC 2541, NGC 5832 and ESO406-042: We present a UV study of 3 extended UV (XUV) galaxies that we have observed
with the UVIT and the GMRT. XUV galaxies show filamentary or diffuse star
formation well beyond their optical disks, in regions... | astro-ph |
PDRs4All III: JWST's NIR spectroscopic view of the Orion Bar: (Abridged) We investigate the impact of radiative feedback from massive stars
on their natal cloud and focus on the transition from the HII region to the
atomic PDR (crossing the ionisation front (IF)), and the subsequent transition
to the molecular PDR (cro... | astro-ph |
Spherical Harmonic Analysis of the Angular Distribution of Gamma-Ray
Bursts: We compute the angular power spectrum C_l of the BATSE 3B catalog, and find
no evidence for clustering on any scale. These constraints bridge the entire
range from small scales, probing source clustering and repetition, to large
scales const... | astro-ph |
High Energy Astroparticle Physics: We give a brief (and highly incomplete) overview of the current experimental
and theoretical status of high energy cosmic rays and their secondary
gamma-rays and neutrinos. We focus on the role of large scale magnetic fields
and on multi-messenger aspects linking these three channels.... | astro-ph |
Stellar streams from black hole-rich star clusters: Nearly a hundred progenitor-less, thin stellar streams have been discovered
in the Milky Way, thanks to Gaia and related surveys. Most streams are believed
to have formed from star clusters and it was recently proposed that extended
star clusters -- rich in stellar-ma... | astro-ph |
Engineering physics of superconducting hot-electron bolometer mixers: Superconducting hot-electron bolometers are presently the best performing
mixing devices for the frequency range beyond 1.2 THz, where good quality
superconductor-insulator-superconductor (SIS) devices do not exist. Their
physical appearance is very ... | astro-ph |
Choked accretion: from radial infall to bipolar outflows by breaking
spherical symmetry: Steady state, spherically symmetric accretion flows are well understood in
terms of the Bondi solution. Spherical symmetry however, is necessarily an
idealized approximation to reality. Here we explore the consequences of
deviati... | astro-ph |
Rational Approximation Formula for Chandrasekhar's H-function for
Isotropic Scattering: We first establish a simple procedure to obtain with 11-figure accuracy the
values of Chandrasekhar's H-function for isotropic scattering using a
closed-form integral representation and the Gauss-Legendre quadrature. Based on
the ... | astro-ph |
The Voyage of Metals in the Universe from Cosmological to Planetary
Scales: the need for a Very High-Resolution, High Throughput Soft X-ray
Spectrometer: Metals form an essential part of the Universe at all scales. Without metals
we would not exist, and the Cosmos would look completely different. Metals are
primari... | astro-ph |
Origin of the Galactic Halo: accretion vs. in situ formation: We test the hypothesis that the classical and ultra-faint dwarf spheroidal
satellites of the our Galaxy have been the building blocks of the Galactic halo
by comparing their [O/Fe] and [Ba/Fe] vs. [Fe/H] patterns with the ones
observed in Galactic halo stars... | astro-ph |
The Cluster of Galaxies Abell 970: We present a dynamical analysis of the galaxy cluster Abell 970 based on a
new set of radial velocities measured at ESO, Pic du Midi and Haute-Provence
observatories. Our analysis indicates that this cluster has a substructure and
is out of dynamical equilibrium. This conclusion is al... | astro-ph |
Continuum and line modelling of discs around young stars. I. 300000 disc
models for Herschel/GASPS: We have combined the thermo-chemical disc code ProDiMo with the Monte Carlo
radiative transfer code MCFOST to calculate a grid of ~300000 circumstellar
disc models, systematically varying 11 stellar, disc and dust para... | astro-ph |
The near-infrared size-luminosity relations for Herbig Ae/Be disks: We report the results of a sensitive K-band survey of Herbig Ae/Be disk sizes
using the 85-m baseline Keck Interferometer. Targets were chosen to span the
maximum range of stellar properties to probe the disk size dependence on
luminosity and effective... | astro-ph |
Time resolved spectroscopy of the multiperiodic pulsating subdwarf B
star PG1605+072: We present results for the 2m spectroscopic part of the MultiSite
Spectroscopic Telescope campaign, which took place in May/June 2002. In order
to perform an asteroseismological analysis on the multiperiodic pulsating
subdwarf B sta... | astro-ph |
Unveiling the evolutionary state of three B supergiant stars: PU Gem,
$ε$ CMa and $η$ CMa: We aim to combine asteroseismology, spectroscopy, and evolutionary models to
establish a comprehensive picture of the evolution of Galactic blue supergiant
stars (BSG). To start such an investigation, we selected three BSG cand... | astro-ph |
The Oxygen Bottleneck for Technospheres: As oxygen is essential for respiration and metabolism for multicellular
organisms on Earth, its presence may be crucial for the development of a
complex biosphere on other planets. And because life itself, through
photosynthesis, contributed to creating our oxygen-rich atmospher... | astro-ph |
Coupling dark-baryonic matter density profile for vacuum decay scenarios: The cosmological consequences of an interacting model in which vacuum decay
law is deducted from the effect that vacuum decay has on the dark matter
evolution are investigated. Here, the baryonic matter is also considered as a
fluid gravitational... | astro-ph |
Epicyclic frequencies for rotating strange quark stars: the importance
of stellar oblateness: Kilohertz QPOs can be used as a probe of the inner regions of accretion disks
in compact stars and hence also of the properties of the central object. Most
models of kHz QPOs involve epicyclic frequencies to explain their or... | astro-ph |
Spatial correlation function and pairwise velocity dispersion of
galaxies: CDM models versus the Las Campanas Survey: We show, with the help of large N-body simulations, that the real-space
two-point correlation function and pairwise velocity dispersion of galaxies can
both be measured reliably from the Las Campanas ... | astro-ph |
Balmer jump variations of HD 215441 (Babcock's star): Balmer jump discontinuity of the peculiar star HD 215441 was measured on 14
continuous energy distributions obtained by S. J. Adelman at Kitt Peak National
and Palomar Observatories. The results show that the Balmer jump vary by about
0.05 dex over the cycle of the ... | astro-ph |
The dynamics of eccentric accretion discs in superhump systems: We have applied an eccentric accretion disc theory in simplified form to the
case of an accretion disc in a binary system, where the disc contains the 3:1
Lindblad resonance. This is relevant to the case of superhumps in SU Ursae
Majoris cataclysmic variab... | astro-ph |
The habitability of a stagnant-lid Earth: Plate tectonics is a fundamental component for the habitability of the Earth.
Yet whether it is a recurrent feature of terrestrial bodies orbiting other
stars or unique to the Earth is unknown. The stagnant lid may rather be the
most common tectonic expression on such bodies. T... | astro-ph |
The IceCube Neutrino Observatory Part V: Neutrino Oscillations and
Supernova Searches: Papers on neutrino oscillation and supernova searches submitted to the 33nd
International Cosmic Ray Conference (Rio de Janeiro 2013) by the IceCube
Collaboration. | astro-ph |
An analysis of the FIR/RADIO Continuum Correlation in the Small
Magellanic Cloud: The local correlation between far-infrared (FIR) emission and radio-continuum
(RC) emission for the Small Magellanic Cloud (SMC) is investigated over scales
from 3 kpc to 0.01 kpc. Here, we report good FIR/RC correlation down to ~15 pc.... | astro-ph |
Imprint of a 2 Myr old source on the cosmic ray anisotropy: We study numerically the anisotropy of the cosmic ray (CR) flux emitted by a
single source calculating the trajectories of individual CRs. We show that the
contribution of a single source to the observed anisotropy is instead
determined solely by the fraction ... | astro-ph |
Hall drift and the braking indices of young pulsars: Braking index measurements of young radio pulsars are all smaller than the
value expected for spin down by magnetic dipole braking. We investigate
magnetic field evolution in the neutron star crust due to Hall drift as an
explanation for observed braking indices. Usi... | astro-ph |
Elastic and breaking properties of epitaxial face-centered crystals in
neutron star crusts and white dwarf cores: Crystallization of dense matter in neutron star crusts and white dwarf cores
may be similar to epitaxial crystal growth in terrestrial laboratories. However
in stellar crystals, the spacing between horizo... | astro-ph |
Faint End of 1.3 mm Number Counts Revealed by ALMA: We present the faint end of number counts at 1.3 mm (238 GHz) obtained with
the Atacama Large Millimeter/submillimeter Array (ALMA). Band 6 observations
were carried out targeting 20 star-forming galaxies at z ~ 1.4 in the
Subaru/XMM-Newton Deep Survey field. In the o... | astro-ph |
Lyot-based Ultra-Fine Pointing Control System for Phase Mask
Coronagraphs: High performance coronagraphic imaging at small inner working angle requires
efficient control of low order aberrations. The absence of accurate pointing
control at small separation not only degrades coronagraph starlight rejection
but also in... | astro-ph |
On the accuracy of N-body simulations at very large scales: We examine the deviation of Cold Dark Matter particle trajectories from the
Newtonian result as the size of the region under study becomes comparable to or
exceeds the particle horizon. To first order in the gravitational potential,
the general relativistic re... | astro-ph |
The immediate environment of the Class 0 protostar VLA1623, on scales of
~50-100 AU, observed at millimetre and centimetre wavelengths: We present high angular resolution observations, taken with the Very Large
Array (VLA) and Multiple Element Radio Linked Interferometer Network (MERLIN)
radio telescopes, at 7mm and ... | astro-ph |
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