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Observed effects of star-planet interaction

Published online by Cambridge University Press:  09 September 2016

Scott J. Wolk ,
Ignazio Pillitteri  and
Katja Poppenhaeger
Scott J. Wolk
Affiliation:
Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138, USA email: swolk@cfa.harvard.edu, kpoppen@cfa.harvard.edu
Ignazio Pillitteri
Affiliation:
Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138, USA email: swolk@cfa.harvard.edu, kpoppen@cfa.harvard.edu Osservatorio Astronomico di Palermo, piazza del Parlamento 1, I-90134 Palermo, Italy email: pilli@astropa.unipa.it
Katja Poppenhaeger
Affiliation:
Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138, USA email: swolk@cfa.harvard.edu, kpoppen@cfa.harvard.edu
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Abstract

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Since soon after the discovery of hot Jupiters, it had been suspected that interaction of these massive bodies with their host stars could give rise to observable signals. We discuss the observational evidence for star-planet interactions (SPI) of tidal and magnetic origin observed in X-rays and FUV. Hot Jupiters can significantly impact the activity of their host stars through tidal and magnetic interaction, leading to either increased or decreased stellar activity – depending on the internal structure of the host star and the properties of the hosted planet. In HD 189733, X-ray and FUV flares are preferentially in a very restricted range of planetary phases. Matsakos et al. (2015) show, using MHD simulations, planetary gas can be liberated, forming a stream of material that gets compressed and accretes onto the star with a phase lag of 70-90 degrees. This scenario explains many features observed both in X-rays and the FUV (Pillitteri et al. 2015). On the other hand, WASP-18 – an F6 star with a massive hot Jupiter, shows no signs of activity in X-rays or UV. Several age indicators (isochrone fitting, Li abundance) point to a young age (~0.5 –1.0 Gyr) and thus significant activity was expected. In this system, tidal SPI between the star and the very close-in and massive planet appears to destroy the formation of magnetic dynamo and thus nullify the stellar activity.

Keywords

X-rays: starsmagnetic fieldsexoplanetsinteractions
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S320: Solar and Stellar Flares and their Effects on Planets , August 2015 , pp. 382 - 387
Copyright
Copyright © International Astronomical Union 2016 

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