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Star-Planet Interaction: The Curious Case of the Planet Spoon-feeding Its Host Star (and Other Amenities)

Published online by Cambridge University Press:  27 January 2016

Ignazio Pillitteri ,
S. J. Wolk ,
A. Maggio  and
T. Matsakos
Ignazio Pillitteri
Affiliation:
SAO-Harvard CfA, 60 Garden St. Cambridge 02138 MA, USA email: [email protected] INAF-Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, IT
S. J. Wolk
Affiliation:
SAO-Harvard CfA, 60 Garden St. Cambridge 02138 MA, USA email: [email protected]
A. Maggio
Affiliation:
INAF-Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, IT
T. Matsakos
Affiliation:
Dept. Astronomy & Astrophysics, University of Chicago, 5640 S. Ellis Ave, Chicago, IL 60637, USA
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Abstract

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We report two cases of Star-Planet Interaction (SPI) in two systems with hot Jupiters: HD 189733 and HD 17156. We used HST-COS to study the FUV variability of HD 189733 after the planetary eclipse. With the support of MHD simulations, we evince that material is likely evaporating from the planet and accreting onto the parent star. This produces a hot spot on the stellar surface, co-moving with the planetary motion and responsible of the X-ray and FUV variability at peculiar planetary phases. In HD 17156, which hosts a hot Jupiter in an eccentric orbit, we observed an enhancement of the X-ray activity at the passage of its planet at the periastron. The origin can be due to magnetic reconnection between the planetary and stellar magnetic fields, or due to material tidally stripped from the planet and accreting onto the star.

Keywords

stars: activitystars: coronaestars: solar-type(stars:) planetary systemsstars: individual (HD 189733, HD 17156)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S314: Young Stars & Planets Near the Sun , November 2015 , pp. 262 - 263
Copyright
Copyright © International Astronomical Union 2016 

References

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