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Communication Dans Un Congrès Année : 2023

Which star-planet combinations lead to atmospheric retention?

Jean-Yves Chaufray
Thomas Cravens
  • Fonction : Auteur
  • PersonId : 1032727
Ravi Kopparapu
François Leblanc
Yingjuan Ma
  • Fonction : Auteur
  • PersonId : 1032839
Shotaro Sakai
  • Fonction : Auteur
  • PersonId : 1032923
Kevin B. Stevenson
  • Fonction : Auteur
  • PersonId : 1260814
Naoki Terada
  • Fonction : Auteur
  • PersonId : 1004341
Aline A Vidotto
Andrew Yau
  • Fonction : Auteur

Résumé

The ability of a planet to retain an atmosphere influences whether water can be stable as a liquid at the planet’s surface. A planet’s atmospheric state is the result of source, loss, and modification processes that have acted on the atmosphere over time. The loss of atmosphere to space is therefore an important component in assessing planetary surface habitability. ‘Atmospheric escape’ is a catch-all term that refers to distinct processes that provide sufficient energy to particles for escape to space. Escape processes include thermal escape, hydrodynamic escape, ion loss, photochemical escape, and sputtering. At present, scientists who study atmospheric escape processes at Earth, solar system planets, and exoplanets each employ different and often siloed strategies to estimate escape rates. This fractured approach has hindered development of a comprehensive understanding of how atmospheric escape works at any planet. Here we present an overview of an ongoing team science effort to estimate atmospheric escape rates for a wide variety of star-planet combinations. With contributions from observers and modelers from the heliophysics, planetary science, and astrophysics communities, we have: (1) re-analyzed existing observations of atmospheric escape from different solar system objects, (2) compared escape from magnetized and unmagnetized regions of Mars to evaluate the importance of magnetic fields in controlling escape, and (3) upgraded and applied models of atmospheric ion escape. Our main focus in the coming years will be to determine which regions within the parameter space of stellar and planetary properties relevant for atmospheric escape are most likely to result in planets that retain habitable atmospheres. We will accomplish this by developing a database of end-to-end model predictions of escape via each of the major escape processes for more than 200 star-planet combinations.
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Dates et versions

insu-04343300 , version 1 (13-12-2023)

Identifiants

  • HAL Id : insu-04343300 , version 1

Citer

Dave A. Brain, Zachory K. Berta-Thompson, Michael Chaffin, Jean-Yves Chaufray, Ofer Cohen, et al.. Which star-planet combinations lead to atmospheric retention?. AGU Fall Meeting 2023, Dec 2023, San Francisco, United States. ⟨insu-04343300⟩
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