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the atmospheric remote-sensing infrared exoplanet large-survey was selected as m4 mission in the esa cosmic vision programme. this mission will study the chemical composition of exoplanetary atmospheres via high resolution, multi-wavelength spectroscopy with high photometric precision. these tasks demand highly stable ... | architectural design of the ariel fgs software |
one of our goals with the soon-to-launch james webb space telescope (jwst) is to better characterize the atmospheres of exoplanets. but will clouds get in the way of our chances?the hunt for wateras a stars light filters through a planets atmosphere on its way to earth, the atmosphere absorbs certain wavelengths depend... | cloudy challenges to exploring exoplanet atmospheres |
an essential factor for the habitability of rocky exoplanets over geologic timescales is climate regulation via the carbonate-silicate cycle. without such regulation, uninhabitably hot or cold climates could form, even for planets lying within their host star's habitable zone. while often associated with plate tectonic... | compositional constraints on the lifetime of habitable climates on rocky exoplanets |
one of the fundamental questions for planetary science is how surfaces of other planets similar to the rocky bodies in our solar system look like. what is the rock structure like? will there be water? are there any active atmospheric cycles? how can we detect these different conditions? the current space missions and g... | from clouds to crust — cloud diversity and surface conditions in atmospheres of rocky exoplanets |
interpretation of future observational measurements of exoplanet atmospheres requires understanding their chemistry, dynamics, and energetics. recent advancements in numerical modeling of exoplanets allow for state-of-the-art predictions of atmospheric evolution, planetary habitability, and spectroscopic measurements. ... | on the ionospheres of strongly- to weakly-oxygenated terrestrial exoplanets |
relatively little is understood about the atmospheric composition of middling size exoplanets, sub-neptunes. although being one of the most common planets observed [1], a subclass of these exoplanets have long eluded atmospheric characterization for their uncharacteristically flat spectra observed from the hubble space... | cleaning our hazy and cloudy lens on sub-neptune exoplanets |
stellar flares of active m dwarfs can affect the atmospheric composition of close-orbiting gas giants and can result in time-dependent transmission spectra, which in turn can bias retrieval analyses. existing studies that have researched this do not account for possible effects of climate dynamics and have not explored... | how stellar flares of m dwarfs impact the composition and spectra of gaseous exoplanets |
for thousands of years, inspired by the star-filled dark night sky, people have wondered what lies beyond earth. today, the search for signs of life is a key motivator in modern-day planetary exploration. the newly launched james webb space telescope will enable us to study gases in rocky exoplanet atmospheres, possibl... | planetary atmospheres and the search for signs of life beyond earth |
the upcoming launch of jwst brings with it an excitement to finally have the precision necessary to begin to observe and characterize the atmospheres of true terrestrial planets via transmission spectroscopy. previous studies of the viability of this technique have assumed cloud-free or constant-cloud-deck atmospheres ... | the impact of variable cloud cover on multi-epoch transmission observations of terrestrial exoplanet atmospheres. |
non-rocky sub-jovian exoplanets in high irradiation environments are rare. ltt9779b is one of the few such planets discovered to date, and the first example of an ultra-hot neptune. the planet's bulk density indicates that it has a substantial atmosphere. to investigate its atmospheric composition and shed further ligh... | first thermal eclipses and phase curves of a hot neptune |
the mechanical, structural and thermal design of the telescope assembly of arielgarcia-perez, j. perez-alvarez, a. fernandez-soler, g. alonso (*) instituto de microgravedad ignacio da riva (idr/upm), universidad politécnica de madrid (upm), 28040 madrid, spain(*) corresponding authorabstractthe atmospheric remote-sensi... | the mechanical, structural and thermal design of the telescope assembly of ariel |
now is an exciting, perhaps "revolutionary", time to be an exoplanet scientist. kepler provided us with a powerful foundation in exoplanet statistics and occurrence rates, which helped motivate the all-sky tess mission that has provided thousands of new, closer-by transiting planet candidates primed for detailed charac... | current and future landscape of small exoplanet demographics |
hot rocky exoplanets present us with the unique opportunity to give us insights into their interiors through the characterization of their atmospheres. with the upcoming launch of the jwst and ariel ushering in a new era of exoplanet observations, this topic is becoming more relevant than ever. a crucial element in thi... | modeling volatile species in magma ocean-atmosphere interactions on hot rockyexoplanets |
plain language summarythe modelling of the martian climate has drastically improved over the last two decades. there are currently several highly sophisticated mars models being used for research, these have already greatly improved our understanding of mars' climate. here i detail the adaptation of the met office unif... | modelling an idealised martian climate with the unified model: the next "giant leap" for mars gcms. |
no planet in the solar system exists that is analogous to super-earths and mini-neptunes, a class of exoplanets with radii between those of earth and neptune. because of stronger gravity than earth, the new class of exoplanet can retain a sizable hydrogen-dominated atmosphere. we call these planets gas dwarf planets, i... | detecting biosignatures in the atmospheres of gas dwarfs with jwst |
envision [1,2] is a venus orbiter mission that will determine the nature and current state of geological activity on venus, and its relationship with the atmosphere, to understand how and why venus and earth evolved so differently. it is a candidate for esa's m5 space science mission, with strong nasa participation. it... | envision: europe's proposed mission to venus |
massspec, a method for determining the mass of a transiting exoplanet from its transmission spectrum alone, was proposed by dewit and seager (2013). the premise of this method relies on the planet's surface gravity being extracted from the transmission spectrum via its affect on the atmospheric scale height, which in t... | challenges to constraining exoplanet masses via transmission spectroscopy |
opening windows into the atmospheres of other worlds is undoubtedly among the most pivotal contributions to hst's scientific legacy. exoplanetary transmission spectra have yielded insights into the their composition, temperatures, and pressures, providing a foundation for the new era of atmospheric characterization wit... | unlocking the stellar treasure trove: a legacy library of stellar hosts' heterogeneities, activity, and spectral contributions from hst exoplanet data |
a lack of strong atmospheric spectral features when observing exoplanets may suggest the presence of a high, optically thick cloud layer and poses great challenges for atmospheric characterization. as a result there are many outstanding questions about the clouds, and more generally particulates, present in exoplanet a... | laboratory studies of extraterrestrial clouds through terrestrial means |
studying the chemical compositions of exoplanetary atmospheres provides valuable information about the conditions and characteristics of those atmospheres, which could help search for signs of extraterrestrial life. to date, over 3,000 exoplanets have been discovered using the transit method. the transmission spectrosc... | transmission spectroscopy analyses of jovian planets with hubble space telescope |
in the study of planetary habitability, it is critical to recognize that all models and subsequent inferences of exoplanet atmospheres, interiors, and surface conditions are based largely on in-situ data acquired from solar system bodies. a fundamental challenge that the exoplanet community faces is the dearth of knowl... | testing the boundaries of planetary habitability: the critical need for in-situ data |
the chemical state of an atmosphere greatly affects the climate and habitability of an exoplanet. therefore, a correct interpretation of exoplanet observations will require an understanding of the underlying chemistry. furthermore, it has been found that the presence of lightning on exoplanets is reasonable, which can ... | lightning disequilibrium chemistry on habitable zone exoplanets |
understanding the surface composition and conditions on venus is beneficial for improving our understanding of the origin and evolution of terrestrial planets and characteristics of exoplanets. microwave remote sensing with sar can be used to image the surface of venus through a dense optically opaque atmosphere. synth... | design of polarimetric synthetic aperture radar for venus: a proposal |
a key objective of exoplanet science is to determine the chemical, dynamical, and radiative processes that govern planetary atmospheres. countless orbits/hours of hst/spitzer have been employed to determine transiting exoplanet atmospheric properties spanning the uv to mid-ir. these multiwavelength observations have pr... | testing giant extrasolar planet atmospheric physics with uv-scope |
the soon-to-launch nasa james webb space telescope (jwst) will provide unprecedented opportunities for characterizing exoplanet atmospheres. however, given the relatively large amount of observational time required to study the atmospheres of potentially earth-like exoplanets, it is important to develop an understandin... | characterizing atmospheres of transiting earth-like planets orbiting m dwarfs |
the esa envision mission will determine the nature and current state of venus' geological evolution and its relationship with the atmosphere, to understand how and why venus and earth evolved so differently. venus may once have been habitable, with liquid water oceans, before developing the enormous greenhouse warming ... | the venspec suite on the esa envision mission – a holistic investigation of the coupled surface atmosphere system of venus |
liquid water is generally assumed to be an essential factor for the emergence of life, and so a major goal in exoplanet science is the search for planets with water oceans. on terrestrial planets, the silicate mantle is a large source of water, which can be outgassed into the atmosphere via volcanism. outgassing is sub... | water oceans on high-density, stagnant-lid exoplanets from coupled interior-atmosphere modeling |
discovery of frequent superflares on active cool stars opened a new avenue in understanding the properties of eruptive events and their impact on exoplanetary environments. solar data suggest that coronal mass ejections (cmes) should be associated with superflares on active solar-like planet hosts and produce stellar e... | extreme energetic particle events by superflare associated cmes from planet hosting stars |
secondary eclipses of transiting exoplanets (when a host star occults its planet) are diagnostic of atmospheric composition, meteorology, and can even potentially reveal geophysical activity. indeed, volcanic activity has been suggested to explain year-to-year variability in infrared eclipses of the hot super-earth 55 ... | searching for eclipse variability for kepler-76 b in the kepler dataset |
only a single near-surface profile exists of the atmosphere of our twin planet, that obtained in 1985 by the vega-2 lander. the handful of other probe missions have very limited vertical resolution, or sensor failures. unlike altitudes above 40km, which have been relatively well-surveyed by radio occultation profiles f... | venus atmospheric structure investigation (vasi) on the davinci probe |
potentially habitable exoplanets are targets of great interest for upcoming astronomical observatories and mission concepts such as jwst, luvoir, habex, ost, and mirecle. clouds strongly affect climate and habitability, but they are highly uncertain. cloud microphysics, in particular, is often crudely approximated by a... | impact of planetary parameters on water clouds microphysics |
life has played a key role in shaping the atmosphere since its origin on earth and is likely to have played a similar role on inhabited exoplanets. however, modelling the biosphere's impact on climate is complicated by the range of time and spatial scales involved. 3d climate models have successfully been used to spati... | towards coupled modelling of the biosphere and atmosphere for the archean earth and similar exoplanets |
depending on the metallicity of the protoplanetary disk and processes such as gas accretion during planetary formation and atmospheric loss during planetary evolution, the atmospheres of sub-jupiter-sized planets could exhibit a variety of bulk compositions. examples include hydrogen-dominated atmospheres like jupiter,... | effects of bulk composition on the atmospheric dynamics on close-in exoplanets |
escape is a mission proposed to esa in response to the m5 call that will quantitatively estimate the amount of escaping particles of the major atmospheric components (nitrogen and oxygen), as neutral and ionised species, escaping from the earth as a magnetised planet. the spatial distribution and temporal variability o... | european spacecraft for the study of atmospheric particle escape (escape): a planetary mission to earth, proposed to esa in response to the m5-call |
here we approach the study of extraterrestrial lightning by studying the formation and propagation of streamer discharges on titan with an atmospheric composition of n2:ch4=98.4%:1.6%. therefore, we simulate the motion of electrons from initial electron-ion patches in n2:ch4 and for comparison also in n2:o2 mixtures wi... | electron transport and streamer propagation in the atmosphere of titan and other n2:ch4 or n2:o2 mixtures |
why our most earth-like neighbor is so different ? venus should be the most earth-like of our planetary neighbors: its size, bulk composition and distance from the sun are similar to those of earth. surprisingly little is known about its past and current state, not even the basic sequence and timing of events that form... | science with envision: understanding why our most earth-like neighbor is so different |
the atmospheric structure and composition of wasp-12b has been hotly contested for years, with disagreements in the presence of a thermal inversion as well as the c/o ratio (madhusudhan et al. 2011 nature 469, 64-67; crossfield et al. 2012 apj 760, 140; swain et al. 2013 icarus 225, 432-445; line et al. 2014 apj 783, 7... | on the dayside atmospheric structure and composition of wasp-12b |
the james webb space telescope offers astronomers the opportunity to observe the composition, structure, and dynamics of transiting exoplanet atmospheres with unprecedented detail. however, such observations require very precise time-series spectroscopic monitoring of bright stars and present unique technical challenge... | the transiting exoplanet community early release science program for jwst |
directly imaged substellar companions around stars are key objects for better understanding the formation and evolution of brown dwarfs and massive planets, as we can infer physical properties like the age, distance or metallicity from their host stars. moreover, we can characterize them spectroscopically, seeking for ... | benchmark brown dwarf companions as exoplanets analogues |
space photometry such as performed by kepler and corot provides exoplanets radius and phase curves with an exquisite precision. the phase curve constrains the longitudinal variation of the albedo and shed light on the horizontal distribution of clouds. the planet radius constraints thermal evolution of the planet, pote... | characterizing exoplanets atmospheres with space photometry at optical wavelengths |
physicochemical and environmental conditions determine the range of possible biogeochemistries on planets and moons. yet, the earth shows that as soon as life took hold, it modified its environment, from the mineralogy of sediments to the global composition of the atmosphere. in their evolution, life and environment ar... | the co-evolution of life & environment, and the astrobiological quest |
exoplanets with size between the earth and neptune (1-4r⊕) do not have any equivalent in our solar system and remain challenging to characterize. yet, there are ubiquitous in the galaxy and fulton et al. (2017) showed that their distribution (number of planets per star vs radius) is bimodal highlighting a gap in the nu... | hst wfc3 g141 data analysis: exploring the transition from super-earth to sub-neptune |
the nasa ames cosmic simulation chamber (cosmic) is a unique facility that is used to study, in the laboratory, neutral and ionized molecules, nanoparticles and grains under the low temperature and high vacuum conditions representative of interstellar, circumstellar, and planetary environments. cosmic is composed of a ... | addressing the experimental needs for the james webb space telescope with the nasa ames' cosmic and ocf facility |
as jwst and other next-generation observatories begin to operate, follow-up observations of planets discovered by missions like kepler and tess will enable exceptional characterization of exoplanetary atmospheres. understanding the stellar environments these planets reside in is critical to these efforts, with the uv r... | quantifying the impact of stellar uv scaling relations on modelling planetary atmospheres |
one of the fundamental questions for planetary science is how surfaces of other planets similar to the rocky bodies in our solar system look like. what is the rock structure like? will there be water? are there any active atmospheric cycles? how can these different conditions be detected? the current space missions and... | from clouds to crust - cloud diversity and surface conditions in atmospheres of rocky exoplanets |
the first in situ mission to venus atmosphere since the ussr vega landers in 1985 was selected by nasa in june 2021. known as davinci or deep atmosphere of venus investigation of noble-gases, chemistry, and imaging, this multi-phase mission will launch in 2029 and conduct two remote-sensing flybys of venus in 2030 befo... | the davinci mission to venus atmosphere and tesserae |
the current understanding of the oxidation state of the archean atmosphere hinges on sulfur gas and organic haze photochemistry. while much of the focus has centered on sulfur dioxide (so2), there are far fewer studies of hydrogen sulfide (h2s) and its influence on archean organic haze and sulfur chemistry. here, we pr... | trace h2s promotes organic aerosol production and oxidized organosulfur formation in archean organic haze chemistry |
we performed heating experiments and subsequent bulk element analyses on murchison samples to determine murchison's broader elemental outgassing trends. | outgassing composition of the murchison meteorite: implications for volatile depletion of planetesimals and terrestrial exoplanet atmospheres |
traditional habitable zone theory assumes that the silicate-weathering feedback regulates the atmospheric co2 of planets within the habitable zone to maintain surface temperatures that allow for liquid water. there is some non-definitive evidence that this feedback has worked in earth history, but it is untested in an ... | a statistical comparative planetology approach to test the habitable zone concept with future space telescopes |
low-mass exoplanets, including rocky planets, might present atmospheres that are massive enough to be detected by jwst in transmission or emission spectroscopy. the first assessment of the observability of their atmosphere is based on their density, which is determined by their bulk composition and irradiance condition... | interior-atmosphere modelling of jwst rocky planets |
liquid water is generally assumed to be the most important factor for the emergence of life, and so a major goal in exoplanet science is the search for planets with water oceans. on terrestrial planets, the silicate mantle is a large source of water, which can be outgassed into the atmosphere via volcanism. outgassing ... | abundance of water oceans on high-density exoplanets from coupled interior-atmosphere modeling |
as the number of detected exoplanets grows exponentially, actively looking for signatures of life becomes increasingly possible. however, as the field advances, and we begin to get data about these planets' atmospheres, new approaches to understanding exoplanets and their observable properties are necessary to realize ... | towards new frameworks for identifying statistical laws in elemental use across ecosystems on earth as driven by planetary context |
during the past few years, exoplanet atmospheric studies have grown tremendously. detections of atomic and molecular species are reported from the ultraviolet to the infrared at low- and high-resolution for earth-mass to jupiter-mass planets and from temperate to ultra-hot worlds. nowadays, ground-based high-resolution... | wasp-127b: a misaligned planet with a partly cloudy atmosphereand tenuous sodium signature seen by espresso |
venus is a vital resource for understanding how earth developed and maintained its current habitable state. venus importance derives from its climate being the antithesis of earths despite being the most similar planet to earth in the solar system. investigating the reasons for this stark divergence in evolution has be... | surprising similarities: comparing the transit spectra of potential earth-like and venus-like exoplanets |
since the discovery of a potentially low-mass exoplanet around our nearest neighbour star proxima centauri, several works have investigated the likelihood of a shielding atmosphere and therefore the potential surface habitability of proxima cen b. however, outgassing processes are influenced by several different (unkno... | interior heating and outgassing of proxima cen b: identification of critical parameters |
bayesian atmospheric radiative transfer (bart, harrington et al. 2021, cubillos et al. 2021, blecic et al. 2021) is an open-source, reproducible-research code for atmospheric composition and structure retrieval. its modular design and high degree of user control allow it to be configured to mimic the physics hardwired ... | the bayesian atmospheric radiative transfer (bart) code: exoplanet retrievals flexible enough to resolve controversies |
the twinkle space mission is a space-based observatory that has been conceived to measure the atmospheric composition of exoplanets, stars and solar system objects. twinkle's collaborative multi-year global survey programmes will deliver visible and infrared spectroscopy of thousands of objects within and beyond our so... | twinkle: a low-earth orbit, visible and infrared observatory for exoplanet and solar system spectroscopy |
the composition of rocky exoplanets in the context of stars' composition provides important constraints to formation theories. in this study, we select a sample of exoplanets with mass and radius measurements with an uncertainty <25% and obtain their interior structure. we calculate compositional markers, ratios of ... | chemical fingerprints of formation in rocky super-earths' data |
the smallsat seej (pronounced "siege") will measure the fluxes of high-energy photons emanating from nearby, planet hosting stars and measure the absorption depth of x-rays in the atmospheres of hot jupiter, saturn, and neptune analogs. the discovery of exoplanets has fundamentally changed our perception of the univers... | seej : a smallsat to study the structure and evolution of exo-jupiter atmospheres |
one of the key findings regarding exoplanet science is that majority of the detected close-in planets from kepler fall within the super-earth/sub-neptune regime 1-3.5 earth radii. planet formation models of these systems suggest broad compositional diversity in this radius regime, with a high likelihood for large atmos... | filling a critical gap in the pressure-broadening data needed for modeling super-earths and neptunian atmospheres |
venus is comparable to the earth in size and overall distance from the sun, but is outside of a defined "habitable zone" in which water can exist in liquid form. the deep atmosphere of venus provides a hostile environment for life. however, recent work suggests that the atmosphere at cloud altitudes, which includes reg... | understanding the dynamics of the cloud-level atmosphere on venus and venus analog exoplanets using a middle atmosphere general circulation model |
the esa m4 mission ariel, the atmospheric remote-sensing infrared exoplanet large-survey, has been adopted in 2020 within the cosmic vision science programme of esa. the goal of ariel is to investigate the atmospheres of planets orbiting distant stars in order to address the fundamental questions on how planetary syste... | ariel — the esa m4 space mission to focus on the nature of exoplanets |
in only two decades since the first identification of a planet outside the solar system,and about one since the pioneering detection of an atmosphere, exoplanet science has established itself as a mature field of astrophysics. as the search of as-of-yet undiscovered planets goes on, the field is steadily expanding its ... | exoplanet atmosphere highlights |
the prevalence of rocky planets around nearby m-dwarfs, makes understanding these stars and their evolution over time a crucial component of characterizing these potentially habitable exoplanetary systems. of critical concern is their high-energy emissions from x-rays to the near ultraviolet, which play a key role in d... | far ultraviolet m-dwarf evolution survey: rotation-activity-age correlations across the high-energy spectrum |
the space telescope has helped to determine the atmospheric composition of an exoplanet using the light spectrum of its host star. spectral changes as the planet orbits the star reveal the long-sought presence of exoplanetary methane. | jwst ends game of hide and seek with methane |
traditional habitable zone theory assumes that the silicate-weathering feedback regulates the atmospheric co2 of planets within the habitable zone to maintain surface temperatures that allow for liquid water. there is some non-definitive evidence that this feedback has worked in earth history, but it is untested in an ... | testing the habitable zone |
spectroscopic measurements of exo-atmospheres are essential for full characterization of an exoplanet's composition, temperature, and habitability. given the state of our current technology, transiting hot jupiters are the best candidates for both transmission and emission spectroscopy due to their large radii, extende... | the exo-atmosphere of wasp-103b |
.the upper atmosphere of hd 209458 b undergoes hydrodynamic escape that is the most atmospheric efficient mass-loss process. previous works on its characterisation were mainly based on the available ly-α observations, which provide limited information due to the interstellar medium absorption and the geocoronal emissio... | characterisation of the upper atmosphere of hd 209458 b by means of helium triplet absorption spectra |
the chemical content of a planet-forming disk sets the atmospheric composition of the planets that have formed within it. the inheritance of ices from the dark cloud phase and the transport of these ices through the disk as the result of radial drift and trapping of large dust grains may be much more important for the ... | the impact of icy dust transport and dust traps on disk chemistry |
directly detecting thermal emission from young extrasolar planets allows measurement of their atmospheric composition, gravity and luminosity, which is influenced by their formation mechanism. the gemini planet imager exoplanet survey (gpies) is targeting 600 young, nearby stars using the gpi instrument. the star 51 er... | discovery and follow-up of 51 eri b, a directly-imaged jupiter-like exoplanet and status of the gpies campaign. |
we explore our ability to constrain the major c- and o-bearing chemical species (co, co2, ch4, and h2o), important for determining atmospheric opacity and radiation balance, using forward models for representative exoplanet atmospheres and a radiometric instrument model. we generated synthetic observational data of exo... | optimization of growth parameters for ws2 synthesis on si/sio2 and hopg: effects on crystallinity and optical properties |
we explore our ability to constrain the major c- and o-bearing chemical species (co, co2, ch4, and h2o), important for determining atmospheric opacity and radiation balance, using forward models for representative exoplanet atmospheres and a radiometric instrument model. we generated synthetic observational data of exo... | exoplanet transmission spectral coverage and retrieval of atmospheric molecular abundances |
recent observations of transiting planets have revealed that clouds and hazes are common in exoplanet atmospheres. little is known, however, about how the clouds/hazes form, what their composition is, and how their properties vary with planet parameters. we propose to characterize the atmospheres of two exo-neptunes, g... | clouds in the forecast? a joint spitzer and hst investigation of clouds and hazes for two exo-neptunes |
with its thick co2 atmosphere, moonless skies, and proximity to the sun, venus is considered to be a close analog to common, presumably lifeless, rocky exoplanets. however, the recent suggestion of ph3 in the clouds of venus (greaves et al., 2020) has sparked renewed interest in the prospects for living organisms resid... | in-situ exploration of the exoplanet next door: revealing the chemistry, habitability and evidence of biological processes in the clouds of venus |
we propose a small go program (22.81 hrs charged time) to analyze the atmosphere of wasp-166b, a hot, puffy, super-neptune exoplanet (p = 5.44354 d, mp = 32.1 ± 1.6 m_earth, rp = 7.1 ± 0.3 r_earth, teq = 1270 ± 30 k). we will conduct transmission spectroscopy of one transit of wasp-166b with niriss soss order-1 (0.9 to... | transmission spectroscopy of the super-neptune wasp-166b |
from the census of known planets, the most common populations of exoplanets are super-earths and sub-neptunes. based on bulk densities, super-earths likely have a rocky surface potentially surrounded by thin atmospheres encompassing <1% of their mass, with either primordial or secondary compositions. sub-neptunes po... | from super-puffs to super-earths: finding and studying low-mass planets of varying h/he content |
hydrodynamic escape is the most efficient atmospheric mechanism of planetary mass loss and has a large impact on planetary evolution. however, the lack of observations remained this mechanism poorly understood. therefore, new observations of the he i triplet at 10830 å provide key information to advance hydrodynamic es... | characterisation of the hydrodynamic atmospheric escape of hd 209458 b, hd 189733 b, and gj 3470 b |
beta pictoris is a unique laboratory for studying the formation of giant exoplanets. the system contains two directly imaged planets with dynamically inferred masses, therefore it is a treasure for comparative exoplanetology and calibration of planet formation and evolution models. the presence of the second planet, wh... | unveiling formation signatures in the atmosphere of beta pictoris c |
a central question in exoplanetary research is the characterisation of the composition and internal structure of exoplanets. however, the observable parameters of an exoplanet are scarce and generally limited to the planet's mass and radius and the properties of its host star. this means that it is not possible to full... | a neural network based approach to modelling the internal structure of transiting exoplanets and its application to planets observed by the cheops mission |
atmospheres in our solar system range from oxidizing to reducing, transient to dense, veiled by clouds and hazes to transparent. observations already suggest that exoplanets exhibit an even more diverse range of atmospheric chemistry and composition. nevertheless, there are commonalities across the atmospheres of our s... | the diversity of planetary atmospheric chemistry |
in the past decade, several planets that transit across their parent star have been discovered. models of atmospheric radiative transfer in combination with statistical methods, known as atmospheric retrieval, have been used to interpret the observed spectra of these transiting exoplanets. these analyses seek to give i... | the effects of modeling clouds and hazes in transit transmission spectra of extra solar planets |
we present the discovery and planetary confirmation of koi-3138, a likely earth-sized (1.08 earth radii ) planet in a 9-day orbit around a nearby m dwarf star. a planet transit was detected around koi-3138 with the kepler spacecraft and confirmed via false positive analysis using data from the uk infrared telescope, di... | an exo-venus around a cool, nearby star |
ngts is an automated wide field transit survey designed and built to detect transiting neptune size planet on bright k dwarfs stars. ngts first light was obtained in summer 2015. first preliminary results as well as details simulations of the survey expectation will be presented during this talk.bright k dwarfs stars a... | ngts, a new transit search facility in operation in the southern sky |
a number of planets with radii of 1 - 2.5 earth radius have measured mean densities that allow more than 20% of their bulk interior to be composed of water. how do planets with solid-state water mantles modulate the fluxes of gases reaching the surface? what should we expect about the composition of their evolved atmos... | extreme water: characterizing exoplanets with excess bulk water interiors |
mounting geochemical evidence suggests microorganisms capable of oxygenic photosynthesis (e.g., cyanobacteria) colonized archean continental surfaces, driving oxidative weathering of detrital pyrites prior to the 2.5 ga great oxidation event. modern terrestrial environments dominated by single-celled phototrophs includ... | cryptic oxygen oases: hypolithic photosynthesis in hydrothermal areas and implications for archean surface oxidation |
the wusat—solspec experiment was a proof of concept of a novel approach for analysing the characteristics of an atmosphere with regard to its habitability. once validated the system could be used in the search for extra-terrestrial life by providing details of the compositions of exoplanet atmospheres. the experiment c... | wusat-solspec rexus 17 experiment: measuring atmospheric quantities of oxygen and sodium |
exo-c is a detailed study of the science capability, engineering design, technology requirements, and costing for a modest-aperture space telescope with an internal coronagraph that could directly image exoplanetary systems. during its three year mission, exo-c will carry out imaging and spectroscopy over the wavelengt... | high contrast science program for the exo-c space telescope mission |
accurate estimates of the width of the habitable zone are critical for determining which exoplanets are potentially habitable and estimating the frequency of earth-like planets in the galaxy. recently, the inner edge of the habitable zone has been calculated using 3d atmospheric general circulation models (gcms) that i... | 3d model uncertainty in estimating the inner edge of the habitable zone |
the last decade has seen significant progress on the direct detection and characterization of young, self-luminous giant planets at wide orbital separation from their host stars. several of these planets show evidence for disequilibrium processes like transport-induced quenching in their atmospheres, which affects the ... | the effect of photochemistry and quenching on the atmospheric composition of young directly imaged giant planets |
spectral retrieval is a powerful tool for constraining the chemical and physical properties of exoplanet atmospheres from observed spectra, for both transiting objects and for directly imaged substellar companions. however, this approach has been applied to only about a dozen targets, because obtaining an information-r... | water abundance retrieval from the near-infrared spectrum of κ and b |
even though ultra-short period exoplanets comprise only a small fraction of the total exoplanet population, they present a useful probe into the role of fast rotation rates and small orbital distances on atmospheric dynamics. in this regime, advective timescales are longer than radiative timescales such that the temper... | the atmospheric circulation of ultra-short period exoplanets |
a planet's emission spectrum contains information about atmospheric composition and structure. we compare the bayesian information criterion (bic) of blackbody fits and idealized spectral retrieval fits for the 48 planets with published eclipse measurements in multiple thermal wavebands, mostly obtained with the spitze... | features in the broad-band eclipse spectra of exoplanets: signal or noise? |
kepler data show that multiple terrestrial-sized planets (i.e., earths / super-earths), packed in very close to the central star, are the norm in exoplanetary systems around low-mass stars. around m dwarfs, a significant fraction of these planets reside within the habitable zone (hz). this has kindled intense excitemen... | photoevaporation of earth and super-earth atmospheres in the habitable zones of m dwarfs |
using observations from the mariners, pioneers, vikings, voyagers, pioneer venus, galileo, venus express, curiosity, cassini, new horizons, and numerous observatories both in orbit of earth and on the ground, i will give a survey of the major chemical processes that control the composition of planetary atmospheres. for... | chemistry of planetary atmospheres: insights and prospects |
for the foreseeable future, atmospheric characterization with the james webb space telescope (jwst) will provide our primary window into understanding the nature of exoplanets. jwst is the only near-term space-based telescope that will observe exoplanets in the mid-infrared (mid-ir) wavelengths that are informative for... | detectability of biosignature gases in the mid-infrared for secondary eclipse spectra |
comparative studies of protoplanetary discs, exoplanetary systems, and the solar system revealed the extreme diversity in the orbital architectures of giant planets. their detection over a wide range of orbital radii, spanning from 0.01 to 100 au from the host star, suggests that giant planets can interact with multipl... | chemical diversity in protoplanetary discs and its impact on the formation history of giant planets |
as an exoplanet orbits its star, the thermal radiation coming from the planet varies roughly sinusoidally, with a peak occurring when the hottest hemisphere of the planet faces the observer. a spitzer space telescope phase curve of the ultra-hot jupiter wasp-12b from 2010 showed an unexplained anomaly in the data; unli... | mass loss from the exoplanet wasp-12b inferred from spitzer phase curves |
we present the first elemental abundance measurements of the k dwarf (k6) exoplanet-host star wasp-107 using high-resolution (r~45,000), near-infrared (h- and k-band) spectra from the igrins spectral archive. we use the previously determined physical parameters of the star from literature and infer the abundances of 13... | detailed elemental abundances of a super-neptune host star using high-resolution, near-infrared spectroscopy |
the e-pytheas project sits on the frontier between molecular physics, theoretical chemistry and astrophysics. it aims at enhancing our understanding of the radiative properties of hot gaseous media to allow for improved analysis and interpretation of the large mass of data available on the thousands of exoplanets and e... | interpreting exoplanetary data: the exo-planetary high-temperature hydrocarbons by emission and absorption spectroscopy (e-pytheas project) |
with the search for exoplanets, one of the first characterization efforts made is to determine the composition of the atmosphere. for exoplanets like warm neptunes and hot jupiters, we expect sulfides to condense as cloud layers in their atmospheres. to be able to gain more insight to these types of exoplanets composit... | measuring the vapor pressure of sulfides. |
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