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Atmospheric mass-loss of extrasolar planets orbiting magnetically active host stars

Lalitha, Sairam and Schmitt, J H M M and Dash, Spandan (2018) Atmospheric mass-loss of extrasolar planets orbiting magnetically active host stars. In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 477 (1). pp. 808-815.

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Official URL: https://dx.doi.org/10.1093/mnras/sty732

Abstract

Magnetic stellar activity of exoplanet hosts can lead to the production of large amounts of high-energy emission, which irradiates extrasolar planets, located in the immediate vicinity of such stars. This radiation is absorbed in the planets' upper atmospheres, which consequently heat up and evaporate, possibly leading to an irradiation-induced mass-loss. We present a study of the high-energy emission in the four magnetically active planet-bearing host stars, Kepler-63, Kepler-210, WASP-19, and HAT-P-11, based on new XMM-Newton observations. We find that the X-ray luminosities of these stars are rather high with orders of magnitude above the level of the active Sun. The total XUV irradiation of these planets is expected to be stronger than that of well-studied hot Jupiters. Using the estimated XUV luminosities as the energy input to the planetary atmospheres, we obtain upper limits for the total mass-loss in these hot Jupiters.

Item Type: Journal Article
Additional Information: Copy right of this article belong toOXFORD UNIV PRESS, GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
Department/Centre: Others
Depositing User: Id for Latest eprints
Date Deposited: 12 Jun 2018 16:01
Last Modified: 12 Jun 2018 16:01
URI: http://eprints.iisc.ac.in/id/eprint/59995

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