Results 11 to 20 of about 94,271 (166)
Reflected spectroscopy of small exoplanets I: determining the atmospheric composition of sub-Neptunes planets [PDF]
, 2021 Direct imaging of widely separated exoplanets from space will obtain their reflected light spectra and measure their atmospheric properties, and small and temperate planets will be the focus of the next generation telescopes. In this work, we used our Bayesian retrieval algorithm ExoReL$^{\Re}$ to determine the constraints on the atmospheric properties
Mario Damiano, Renyu Hu
arxiv +4 more sources
Ranges of Atmospheric Mass and Composition of Super Earth Exoplanets [PDF]
, 2008 Terrestrial-like exoplanets may obtain atmospheres from three primary sources: Capture of nebular gases, degassing during accretion, and degassing from subsequent tectonic activity. Here we model degassing during accretion to estimate the range of atmospheric mass and composition on exoplanets ranging from 1 to 30 Earth masses. We use bulk compositions
L. T. Elkins‐Tanton, Sara Seager
arxiv +3 more sources
Conclusive Evidence for a Population of Water Worlds around M Dwarfs Remains Elusive
The Astrophysical Journal Letters, 2023 The population of small, close-in exoplanets is bifurcated into super-Earths and sub-Neptunes. We calculate physically motivated mass–radius relations for sub-Neptunes, with rocky cores and H/He-dominated atmospheres, accounting for their thermal ...
James G. Rogers +2 more
doaj +1 more source
Spectral Retrieval with JWST Photometric data: a Case Study for HIP 65426 b
The Astronomical Journal, 2023 Half of the JWST high-contrast imaging objects will only have photometric data as of Cycle 2. However, to better understand their atmospheric chemistry that informs formation origin, spectroscopic data are preferred.
Ji Wang
doaj +1 more source
A Radiative-convective Model for Terrestrial Planets with Self-consistent Patchy Clouds
The Planetary Science Journal, 2023 Clouds are ubiquitous: they arise for every solar system planet that possesses an atmosphere and have also been suggested as a leading mechanism for obscuring spectral features in exoplanet observations.
James D. Windsor +5 more
doaj +1 more source
Detection of Atmospheric Escape from Four Young Mini-Neptunes
The Astronomical Journal, 2023 We use Keck/NIRSPEC to survey a sample of of young (
Michael Zhang +7 more
doaj +1 more source
Atmospheric circulation of exoplanets
地球与行星物理论评, 2023 To date, more than 5000 exoplanets and more than 2000 brown dwarfs have been confirmed, which shows rich diversities in many aspects. With the rapid growth of the planet family, both observational and theoretical research on exoplanet atmosphere is ...
Yuchen Lian, Yongyun Hu
doaj +1 more source
The Astronomical Journal, 2023 TOI-270 d is a temperate sub-Neptune discovered by the Transiting Exoplanet Survey Satellite (TESS) around a bright ( J = 9.1 mag) M3V host star. With an approximate radius of 2 R _⊕ and equilibrium temperature of 350 K, TOI-270 d is one of the most ...
Thomas Mikal-Evans +8 more
doaj +1 more source
HyDRo: Atmospheric Retrieval of Rocky Exoplanets in Thermal Emission [PDF]
, 2021 Emission spectroscopy is a promising technique to observe atmospheres of rocky exoplanets, probing both their chemistry and thermal profiles. We present HyDRo, an atmospheric retrieval framework for thermal emission spectra of rocky exoplanets. HyDRo does not make prior assumptions about the background atmospheric composition, and can therefore be used
arxiv +1 more source
Aerosols in Exoplanet Atmospheres [PDF]
, 2021 Observations of exoplanet atmospheres have shown that aerosols, like in the Solar System, are common across a variety of temperatures and planet types. The formation and distribution of these aerosols are inextricably intertwined with the composition and thermal structure of the atmosphere.
arxiv +1 more source