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Observable Impacts of Exoplanets on Stellar Hosts – An X-Ray Perspective

Published online by Cambridge University Press:  12 September 2017

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
Ignazio Pillitteri
Affiliation:
Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138, USA email: swolk@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 Queen's University Belfast, University Road, Belfast, BT7 1NN, Northern Ireland, UK email: K.Poppenhaeger@qub.ac.uk
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Abstract

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Soon after the discovery of hot Jupiters, it was 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. 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. We provide several examples of these interactions. In HD 189733, the strongest X-ray flares are preferentially seen in a very restricted range of planetary phases. Hot Jupiters, can also obscure the X-ray signal during planetary transits. Observations of this phenomena have led to the discovery of a thin upper atmospheres in HD 189733A. 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 disrupt the surface shear layer and thus nullify the stellar activity.

Keywords

X-rays: starsmagnetic fieldsexoplanetsinteractions
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 290 - 297
Copyright
Copyright © International Astronomical Union 2017 

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