2024
DOI: 10.1051/0004-6361/202347517
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Self-consistent modeling of metastable helium exoplanet transits

Federico Biassoni,
Andrea Caldiroli,
Elena Gallo
et al.

Abstract: Absorption of stellar X-ray and extreme ultraviolet (EUV) radiation in the upper atmosphere of close-in exoplanets can give rise to hydrodynamic outflows, which may lead to the gradual shedding of their primordial light element envelopes. Excess absorption by neutral helium atoms in the metastable 2\,$^3$S state mhe at sim 10,830 A has recently emerged as a viable diagnostic of atmospheric escape. Here we present a public add-on module to the 1D photoionization hydrodynamic code ATES, designed to calculate the… Show more

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Cited by 5 publications
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“…Thus, the gas is heated to ∼10 4 K where Lyα cooling becomes efficient, thermostating the gas at ∼10 4 K (e.g., Murray-Clay et al 2009;Owen & Wu 2016). Around K-stars, the helium triplet state is depopulated by collisions with electrons (Oklopčić 2019) and populated by recombinations-processes that both happen less efficiently at high temperatures, resulting in a significantly lower population of metastable helium (Biassoni et al 2024).…”
Section: Stellar Winds and Magnetic Fieldsmentioning
confidence: 99%
“…Thus, the gas is heated to ∼10 4 K where Lyα cooling becomes efficient, thermostating the gas at ∼10 4 K (e.g., Murray-Clay et al 2009;Owen & Wu 2016). Around K-stars, the helium triplet state is depopulated by collisions with electrons (Oklopčić 2019) and populated by recombinations-processes that both happen less efficiently at high temperatures, resulting in a significantly lower population of metastable helium (Biassoni et al 2024).…”
Section: Stellar Winds and Magnetic Fieldsmentioning
confidence: 99%