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Atmospheric compositions for rocky exoplanets will depend strongly on the bulk planetary composition and the orbital position of the planet. Non-traditional gases may be present in the atmospheres of exceptionally hot planets. Atmospheres…

Earth and Planetary Astrophysics · Physics 2021-08-20 Laura Schaefer , Vivien Parmentier

The review aims to give an overview of atmospheric escape processes from exoplanets. I briefly discuss the physics of various escape processes responsible for atmospheric escape across different types of exoplanets. Transmission…

Earth and Planetary Astrophysics · Physics 2025-02-26 Gopal Hazra

Recent detection of exoplanets with Earth-like insolation attracts growing interest in how common Earth-like aqua planets are beyond the solar system. While terrestrial planets are often assumed to capture icy or water-rich planetesimals, a…

Earth and Planetary Astrophysics · Physics 2020-07-01 Tadahiro Kimura , Masahiro Ikoma

Low-mass low-density planets discovered by Kepler in the super-Earth mass regime typically have large radii for their inferred masses, implying the presence of H$_2$-He atmospheres. These planets are vulnerable to atmospheric mass loss due…

Earth and Planetary Astrophysics · Physics 2018-02-14 Yayaati Chachan , David J. Stevenson

Rocky planets are common around other stars, but their atmospheric properties remain largely unconstrained. Thanks to a wealth of recent planet discoveries and upcoming advances in observing capability, we are poised to characterize the…

Earth and Planetary Astrophysics · Physics 2022-07-26 R. Wordsworth , L. Kreidberg

Earth's water, intrinsic oxidation state, and metal core density are fundamental chemical features of our planet. Studies of exoplanets provide a useful context for elucidating the source of these chemical traits. Planet formation and…

Earth and Planetary Astrophysics · Physics 2023-04-18 Edward D. Young , Anat Shahar , Hilke E. Schlichting

H$_2$-dominated terrestrial exoplanets are highly accessible to atmospheric characterization via transmission spectroscopy, but such atmospheres are generally thought to be unstable to escape. Here, we propose that close-in, eccentric…

Earth and Planetary Astrophysics · Physics 2025-10-10 R. Arora , S. Ranjan , P. Moitra , A. Mallik

In the present chapter we present the results of evolutionary studies of exoplanetary atmospheres. We mostly focus on the sub- to super-Earth domain, although these methods are applicable to all types of exoplanets. We consider both thermal…

Earth and Planetary Astrophysics · Physics 2020-03-31 K. G. Kislyakova , M. Holmström , H. Lammer , N. V. Erkaev

A variety of terrestrial planets with different physical parameters and exotic atmospheres might plausibly exist outside our Solar System, waiting to be detected by the next generation of space-exploration missions. Some of these planets…

Since planet occurrence and primordial atmospheric retention probability increase with period, the occurrence-weighted median planets discovered by transit surveys may bear little resemblance to the low-occurrence, short-period planets…

Earth and Planetary Astrophysics · Physics 2021-11-10 Kevin C. Schlaufman , Noah D. Halpern

Exoplanet surveys around M dwarfs have detected a growing number of exoplanets with Earth-like insolation. It is expected that some of those planets are rocky planets with the potential for temperate climates favourable to surface liquid…

Earth and Planetary Astrophysics · Physics 2022-09-30 Tadahiro Kimura , Masahiro Ikoma

The key to understanding an extrasolar giant planet's spectrum--and hence its detectability and evolution--lies with its atmosphere. Now that direct observations of thermal emission from extrasolar giant planets are in hand, atmosphere…

Astrophysics · Physics 2007-05-23 Mark S. Marley , Jonathan Fortney , Sara Seager , Travis Barman

Studying exoplanets with their parent stars is crucial to understand their population, formation and history. We review some of the key questions regarding their evolution with particular emphasis on giant gaseous exoplanets orbiting close…

Solar and Stellar Astrophysics · Physics 2015-06-23 Tristan Guillot , Douglas N. C. Lin , Pierre Morel , Mathieu Havel , Vivien Parmentier

In the core accretion paradigm of planet formation, gas giants only form a massive atmosphere after their progenitors exceeded a threshold mass: the critical core mass. Most (exo)planets, being smaller and rock/ice-dominated, never crossed…

Earth and Planetary Astrophysics · Physics 2015-06-23 Chris W. Ormel , Rolf Kuiper , Ji-Ming Shi

The recent discoveries of terrestrial exoplanets and super-Earths extending over a broad range of orbital and physical parameters suggest that these planets will span a wide range of climatic regimes. Characterization of the atmospheres of…

Earth and Planetary Astrophysics · Physics 2015-05-15 Yohai Kaspi , Adam P. Showman

The atmospheres of exoplanets reveal all their properties beyond mass, radius, and orbit. Based on bulk densities, we know that exoplanets larger than 1.5 Earth radii must have gaseous envelopes, hence atmospheres. We discuss contemporary…

Earth and Planetary Astrophysics · Physics 2017-01-04 Drake Deming , Sara Seager

Exoplanet exploration has revealed that many$\unicode{x2013}$perhaps most$\unicode{x2013}$terrestrial exoplanets formed with substantial H$_2$-rich envelopes, seemingly in contrast to solar system terrestrials, for which there is scant…

Earth and Planetary Astrophysics · Physics 2024-09-30 Joshua Krissansen-Totton , Nicholas Wogan , Maggie Thompson , Jonathan J. Fortney

The Moon-forming giant impact extensively melts and partially vaporizes the silicate Earth and delivers a substantial mass of metal to Earth's core. Subsequent evolution of the magma ocean and overlying atmosphere has been described by…

Earth and Planetary Astrophysics · Physics 2019-10-24 Kaveh Pahlevan , Laura Schaefer , Marc M. Hirschmann

The long-term evolution of hydrogen-dominated atmospheres of sub-Neptune-like planets is mostly controlled by two factors: a slow dissipation of the gravitational energy acquired at the formation (known as thermal evolution) and atmospheric…

Earth and Planetary Astrophysics · Physics 2020-10-14 Daria Kubyshkina , Aline A. Vidotto , Luca Fossati , Eoin Farrell

We employ planetary evolution modeling to reproduce the MR distribution of the 198 so far detected planets with mass and radius measured to the <45% and <15% level, respectively, and less massive than 108Me. We simultaneously account for…

Earth and Planetary Astrophysics · Physics 2022-12-28 Daria Kubyshkina , Luca Fossati