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Title: Photoevaporative flows from exoplanet atmospheres: a 3D radiative hydrodynamic parameter study

Journal Article · · Monthly Notices of the Royal Astronomical Society

he photoionization-driven evaporation of planetary atmospheres has emerged as a potentially fundamental process for planets on short-period orbits. While 1D studies have proven the effectiveness of stellar fluxes at altering the atmospheric mass and composition for sub-Jupiter mass planets, there remains much that is uncertain with regard to the larger scale, multidimensional nature of such ‘planetary wind’ flows. In this paper we use a new radiation-hydrodynamic platform to simulate atmospheric evaporative flows. Using the astrobear adaptive mesh refinement (amr) multiphysics code in a co-rotating frame centred on the planet, we model the transfer of ionizing photons into the atmosphere, the subsequent launch of the wind and the wind’s large-scale evolution subject to tidal and non-inertial forces. We run simulations for planets of 0.263 and 0.07 Jupiter masses and stellar fluxes of 2 × 1013 and 2 × 1014 photons cm-2 s-1. Our results reveal new, potentially observable planetary wind flow patterns, including the development, in some cases, of an extended neutral tail lagging behind the planet in its orbit.

Research Organization:
Univ. of Rochester, NY (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office; National Science Foundation (NSF); Space Telescope Science Institute
Grant/Contract Number:
SC0001063; TG-AST120060; ACI-1548562; AST-1515648; AST-1411536; HST-AR-12832.01-A
OSTI ID:
1485345
Alternate ID(s):
OSTI ID: 1610512
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 483, Issue 2; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (4)

Rapid Escape of Ultra-hot Exoplanet Atmospheres Driven by Hydrogen Balmer Absorption journal October 2019
Is π Men c’s Atmosphere Hydrogen-dominated? Insights from a Non-detection of H i Ly α Absorption journal January 2020
Morphology of Hydrodynamic Winds: A Study of Planetary Winds in Stellar Environments journal March 2019
Rapid escape of ultra-hot exoplanet atmospheres driven by Hydrogen Balmer absorption text January 2019

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