Matej Malik
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View article: The Radiative Effects of Photochemical Hazes on the Atmospheric Circulation and Phase Curves of Sub-Neptunes
The Radiative Effects of Photochemical Hazes on the Atmospheric Circulation and Phase Curves of Sub-Neptunes Open
Measuring the atmospheric composition of hazy sub-Neptunes like GJ 1214b through transmission spectroscopy is difficult because of the degeneracy between mean molecular weight (MMW) and haziness. It has been proposed that phase-curve obser…
View article: TOI-421 b: A Hot Sub-Neptune with a Haze-free, Low Mean Molecular Weight Atmosphere
TOI-421 b: A Hot Sub-Neptune with a Haze-free, Low Mean Molecular Weight Atmosphere Open
Common features of sub-Neptune atmospheres observed to date include signatures of aerosols at moderate equilibrium temperatures (∼500–800 K) and a prevalence of high mean molecular weight atmospheres, perhaps indicating novel classes of pl…
View article: TOI-421 b: A Hot Sub-Neptune with a Haze-Free, Low Mean Molecular Weight Atmosphere
TOI-421 b: A Hot Sub-Neptune with a Haze-Free, Low Mean Molecular Weight Atmosphere Open
Common features of sub-Neptunes atmospheres observed to date include signatures of aerosols at moderate equilibrium temperatures (~500-800 K), and a prevalence of high mean molecular weight atmospheres, perhaps indicating novel classes of …
View article: A Nondetection of Iron in the First High-resolution Emission Study of the Lava Planet 55 Cnc e
A Nondetection of Iron in the First High-resolution Emission Study of the Lava Planet 55 Cnc e Open
Close-in lava planets represent an extreme example of terrestrial worlds, but their high temperatures may allow us to probe a diversity of crustal compositions. The brightest and most well-studied of these objects is 55 Cancri e, a nearby …
View article: A Non-Detection of Iron in the First High-Resolution Emission Study of the Lava Planet 55 Cnc e
A Non-Detection of Iron in the First High-Resolution Emission Study of the Lava Planet 55 Cnc e Open
Close-in lava planets represent an extreme example of terrestrial worlds, but their high temperatures may allow us to probe a diversity of crustal compositions. The brightest and most well-studied of these objects is 55 Cancri e, a nearby …
View article: Where are the Water Worlds?: Self-consistent Models of Water-rich Exoplanet Atmospheres
Where are the Water Worlds?: Self-consistent Models of Water-rich Exoplanet Atmospheres Open
It remains to be ascertained whether sub-Neptune exoplanets primarily possess hydrogen-rich atmospheres or whether a population of H 2 O-rich water worlds lurks in their midst. Addressing this question requires improved modeling of water-r…
View article: Where are the Water Worlds?: Self-Consistent Models of Water-Rich Exoplanet Atmospheres
Where are the Water Worlds?: Self-Consistent Models of Water-Rich Exoplanet Atmospheres Open
It remains to be ascertained whether sub-Neptune exoplanets primarily possess hydrogen-rich atmospheres or whether a population of H$_2$O-rich "water worlds" lurks in their midst. Addressing this question requires improved modeling of wate…
View article: Diagnosing Limb Asymmetries in Hot and Ultrahot Jupiters with High-resolution Transmission Spectroscopy
Diagnosing Limb Asymmetries in Hot and Ultrahot Jupiters with High-resolution Transmission Spectroscopy Open
Due to their likely tidally synchronized nature, (ultra)hot Jupiter atmospheres should experience strongly spatially heterogeneous instellation. The large irradiation contrast and resulting atmospheric circulation induce temperature and ch…
View article: Diagnosing limb asymmetries in hot and ultra-hot Jupiters with high-resolution transmission spectroscopy
Diagnosing limb asymmetries in hot and ultra-hot Jupiters with high-resolution transmission spectroscopy Open
Due to their likely tidally synchronized nature, (ultra)hot Jupiter atmospheres should experience strongly spatially heterogeneous instellation. The large irradiation contrast and resulting atmospheric circulation induce temperature and ch…
View article: The Detectability of Rocky Planet Surface and Atmosphere Composition with the JWST: The Case of LHS 3844b
The Detectability of Rocky Planet Surface and Atmosphere Composition with the JWST: The Case of LHS 3844b Open
The spectroscopic characterization of terrestrial exoplanets over a wide spectral range from the near- to the mid-infrared will be made possible for the first time with the JWST. One challenge is that it is not known a priori whether such …
View article: GJ 1252b: A Hot Terrestrial Super-Earth with No Atmosphere
GJ 1252b: A Hot Terrestrial Super-Earth with No Atmosphere Open
In recent years, the discovery of increasing numbers of rocky, terrestrial exoplanets orbiting nearby stars has drawn increased attention to the possibility of studying these planets’ atmospheric and surface properties. This is especially …
View article: GJ 1252b: A Hot Terrestrial Super-Earth With No Atmosphere
GJ 1252b: A Hot Terrestrial Super-Earth With No Atmosphere Open
The increasing numbers of rocky, terrestrial exoplanets known to orbit nearby stars (especially M dwarfs) has drawn increased attention to the possibility of studying these planets' surface properties, and atmospheric compositions & escape…
View article: The Detectability of Rocky Planet Surface and Atmosphere Composition with JWST: The Case of LHS 3844b
The Detectability of Rocky Planet Surface and Atmosphere Composition with JWST: The Case of LHS 3844b Open
The spectroscopic characterization of terrestrial exoplanets will be made possible for the first time with JWST. One challenge to characterizing such planets is that it is not known a priori whether they possess optically thick atmospheres…
View article: Confirmation of Water Absorption in the Thermal Emission Spectrum of the Hot Jupiter WASP-77Ab with HST/WFC3
Confirmation of Water Absorption in the Thermal Emission Spectrum of the Hot Jupiter WASP-77Ab with HST/WFC3 Open
Secondary eclipse observations of hot Jupiters can reveal both their compositions and thermal structures. Previous observations have shown a diversity of hot Jupiter eclipse spectra, including absorption features, emission features, and fe…
View article: The <tt>THOR + HELIOS</tt> general circulation model: multiwavelength radiative transfer with accurate scattering by clouds/hazes
The THOR + HELIOS general circulation model: multiwavelength radiative transfer with accurate scattering by clouds/hazes Open
General circulation models (GCMs) provide context for interpreting multiwavelength, multiphase data of the atmospheres of tidally locked exoplanets. In the current study, the non-hydrostatic THOR GCM is coupled with the HELIOS radiative tr…
View article: No Umbrella Needed: Confronting the Hypothesis of Iron Rain on WASP-76b with Post-processed General Circulation Models
No Umbrella Needed: Confronting the Hypothesis of Iron Rain on WASP-76b with Post-processed General Circulation Models Open
High-resolution spectra are unique indicators of three-dimensional (3D) processes in exoplanetary atmospheres. For instance, in 2020, Ehrenreich et al. reported transmission spectra from the ESPRESSO spectrograph yielding an anomalously la…
View article: EOS: Atmospheric Radiative Transfer in Habitable Worlds with HELIOS
EOS: Atmospheric Radiative Transfer in Habitable Worlds with HELIOS Open
We present EOS, a procedure for determining the outgoing longwave radiation (OLR) and top-of-atmosphere (TOA) albedo for a wide range of conditions expected to be present in the atmospheres of rocky planets with temperate conditions. EOS i…
View article: Strong H<sub>2</sub>O and CO Emission Features in the Spectrum of KELT-20b Driven by Stellar UV Irradiation
Strong H<sub>2</sub>O and CO Emission Features in the Spectrum of KELT-20b Driven by Stellar UV Irradiation Open
Know thy star, know thy planetary atmosphere. Every exoplanet with atmospheric measurements orbits around a star, and the stellar environment directly affects the planetary atmosphere. Here we present the emission spectrum of ultra-hot Jup…
View article: A Comparative Study of Atmospheric Chemistry with VULCAN
A Comparative Study of Atmospheric Chemistry with VULCAN Open
We present an update of the open-source photochemical kinetics code VULCAN to include C–H–N–O–S networks and photochemistry. The additional new features are advection transport, condensation, various boundary conditions, and temperature-de…
View article: Inferring Shallow Surfaces on Sub-Neptune Exoplanets with JWST
Inferring Shallow Surfaces on Sub-Neptune Exoplanets with JWST Open
Planets smaller than Neptune and larger than Earth make up the majority of the discovered exoplanets. Those with H 2 -rich atmospheres are prime targets for atmospheric characterization. The transition between the two main classes, super-E…
View article: Spitzer Phase-curve Observations and Circulation Models of the Inflated Ultrahot Jupiter WASP-76b
Spitzer Phase-curve Observations and Circulation Models of the Inflated Ultrahot Jupiter WASP-76b Open
The large radii of many hot Jupiters can only be matched by models that have hot interior adiabats, and recent theoretical work has shown that the interior evolution of hot Jupiters has a significant impact on their atmospheric structure. …
View article: Terrestrial-type planetary atmospheres with HELIOS
Terrestrial-type planetary atmospheres with HELIOS Open
The next generation of astronomical facilities will be able to retrieve exoplanetary atmospheric spectra in increasing quantity and of increasing quality. Radiative transfer (RT) models of these atmospheres is essential both for interpreti…
View article: Inferring shallow surfaces on sub-neptune exoplanets with JWST
Inferring shallow surfaces on sub-neptune exoplanets with JWST Open
Planets smaller than Neptune and larger than Earth make up the majority of the discovered exoplanets. Those with H2-rich atmospheres are prime targets for atmospheric characterization. The transition between the two main classes, super-Ear…
View article: Optical Transmission Spectroscopy of the Terrestrial Exoplanet LHS 3844b from 13 Ground-based Transit Observations
Optical Transmission Spectroscopy of the Terrestrial Exoplanet LHS 3844b from 13 Ground-based Transit Observations Open
Atmospheric studies of spectroscopically accessible terrestrial exoplanets lay the groundwork for comparative planetology between these worlds and the solar system terrestrial planets. LHS 3844b is a highly irradiated terrestrial exoplanet…
View article: Identifying Atmospheres on Rocky Exoplanets through Inferred High Albedo
Identifying Atmospheres on Rocky Exoplanets through Inferred High Albedo Open
The upcoming launch of the James Webb Space Telescope means that we will soon have the capability to characterize the atmospheres of rocky exoplanets. However, it is still unknown whether such planets orbiting close to M dwarf stars can re…
View article: Self-luminous and Irradiated Exoplanetary Atmospheres Explored with HELIOS
Self-luminous and Irradiated Exoplanetary Atmospheres Explored with HELIOS Open
We present new methodological features and physical ingredients included in the one-dimensional radiative transfer code HELIOS , improving the hemispheric two-stream formalism. We conduct a thorough intercomparison survey with several esta…
View article: Evolutionary models of cold and low-mass planets: cooling curves, magnitudes, and detectability
Evolutionary models of cold and low-mass planets: cooling curves, magnitudes, and detectability Open
Context. Future instruments like the Near Infrared Camera (NIRCam) and the Mid Infrared Instrument (MIRI) on the James Webb Space Telescope (JWST) or the Mid-Infrared E-ELT Imager and Spectrograph (METIS) at the European Extremely Large Te…
View article: Three-dimensional Circulation Driving Chemical Disequilibrium in WASP-43b
Three-dimensional Circulation Driving Chemical Disequilibrium in WASP-43b Open
Spectral features in the observed spectra of exoplanets depend on the composition of their atmospheres. A good knowledge of the main atmospheric processes that drive the chemical distribution is therefore essential to interpret exoplanetar…