Exosphere Modeling of Proxima b: A Case Study of Photochemical Escape with a Venus-like Atmosphere
Abstract
Exoplanets orbiting M dwarfs within habitable zones are exposed to stellar environments more extreme than that terrestrial planets experience in our solar system, which can significantly impact the atmospheres of the exoplanets and affect their habitability and sustainability. This study provides the first prediction of hot oxygen corona structure and the associated photochemical loss from a 1 bar CO2-dominated atmosphere of a Venus-like rocky exoplanet, where dissociative recombination of O2+ ions is assumed to be the major source reaction for the escape of neutral O atoms and formation of the hot O corona (or exospheres) as on Mars and Venus. We employ a 3D Monte Carlo code to simulate the exosphere of Proxima Centauri b (PCb) based on the ionosphere simulated by a 3D magnetohydrodynamic model. Our simulation results show that variability of the stellar wind dynamic pressure over one orbital period of PCb does not affect the overall spatial structure of the hot O corona but contributes to the change in the global hot O escape rate that varies by an order of magnitude. The escape increases dramatically when the planet possesses its intrinsic magnetic fields as the ionosphere becomes more extended with the presence of a global magneticmore »
- Authors:
-
- Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); Center for Research and Exploration in Space Science and Technology II, Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
- Princeton Univ., NJ (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1880118
- Grant/Contract Number:
- AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 923; Journal Issue: 2; Journal ID: ISSN 0004-637X
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Exoplanet evolution; Theoretical models; Extrasolar rocky planets; Exoplanet atmospheres; Upper atmosphere; Exosphere; Planetary atmospheres; Planetary magnetospheres; Planetary science
Citation Formats
Lee, Yuni, Dong, Chuanfei, and Tenishev, Valeriy. Exosphere Modeling of Proxima b: A Case Study of Photochemical Escape with a Venus-like Atmosphere. United States: N. p., 2021.
Web. doi:10.3847/1538-4357/ac26bb.
Lee, Yuni, Dong, Chuanfei, & Tenishev, Valeriy. Exosphere Modeling of Proxima b: A Case Study of Photochemical Escape with a Venus-like Atmosphere. United States. https://doi.org/10.3847/1538-4357/ac26bb
Lee, Yuni, Dong, Chuanfei, and Tenishev, Valeriy. Tue .
"Exosphere Modeling of Proxima b: A Case Study of Photochemical Escape with a Venus-like Atmosphere". United States. https://doi.org/10.3847/1538-4357/ac26bb. https://www.osti.gov/servlets/purl/1880118.
@article{osti_1880118,
title = {Exosphere Modeling of Proxima b: A Case Study of Photochemical Escape with a Venus-like Atmosphere},
author = {Lee, Yuni and Dong, Chuanfei and Tenishev, Valeriy},
abstractNote = {Exoplanets orbiting M dwarfs within habitable zones are exposed to stellar environments more extreme than that terrestrial planets experience in our solar system, which can significantly impact the atmospheres of the exoplanets and affect their habitability and sustainability. This study provides the first prediction of hot oxygen corona structure and the associated photochemical loss from a 1 bar CO2-dominated atmosphere of a Venus-like rocky exoplanet, where dissociative recombination of O2+ ions is assumed to be the major source reaction for the escape of neutral O atoms and formation of the hot O corona (or exospheres) as on Mars and Venus. We employ a 3D Monte Carlo code to simulate the exosphere of Proxima Centauri b (PCb) based on the ionosphere simulated by a 3D magnetohydrodynamic model. Our simulation results show that variability of the stellar wind dynamic pressure over one orbital period of PCb does not affect the overall spatial structure of the hot O corona but contributes to the change in the global hot O escape rate that varies by an order of magnitude. The escape increases dramatically when the planet possesses its intrinsic magnetic fields as the ionosphere becomes more extended with the presence of a global magnetic field. Furthermore, the extended hot O corona may lead to a more extended H exosphere through collisions between thermal H and hot O, which exemplifies the importance of considering nonthermal populations in exospheres to interpret future observations.},
doi = {10.3847/1538-4357/ac26bb},
journal = {The Astrophysical Journal},
number = 2,
volume = 923,
place = {United States},
year = {Tue Dec 21 00:00:00 EST 2021},
month = {Tue Dec 21 00:00:00 EST 2021}
}
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