Influence of the evolving stellar X-ray luminosity distribution on exoplanetary mass loss

Details Influence of the evolving stellar X-ray luminosity distribution on exoplanetary mass loss Influence of the evolving stellar X-ray luminosity distribution on exoplanetary mass loss

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...477..309p&link_type=abstract

Astronomy and Astrophysics, Volume 477, Issue 1, January I 2008, pp.309-314

Astronomy and Astrophysics

Astrophysics

33

Planetary Systems, Stars: Activity, X-Rays: Stars, Star: Coronae

Scientific paper

Aims:We investigate the influence of high-energy stellar radiation at close-in orbits on atmospheric mass loss during the stellar evolution of a G-type star. Methods: High-energy stellar luminosity varies over a wide range for G field stars. The X-ray luminosity distributions from the Pleiades, the Hyades, and the field are used to derive a scaling law for the evolution of the stellar X-ray luminosity distribution. A modified energy-limited escape approach is taken for calculating atmospheric mass loss for a broad range of planetary parameters. Results: We show that the evolution of close-in exoplanets strongly depends on the detailed X-ray luminosity history of their host stars, which varies over several orders-of-magnitude for G stars. Stars located in the high-energy tail of the luminosity distribution can evaporate most of its planets within 0.5 AU, while a significant fraction of planets can survive if exposed to a moderate X-ray luminosity. We show the change on an initial planetary mass distribution caused by atmospheric escape.

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