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First observation of planet-induced X-ray emission: The system HD 179949

Published online by Cambridge University Press:  01 October 2007

S. H. Saar ,
M. Cuntz ,
V. L. Kashyap  and
J. C. Hall
S. H. Saar
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA email: [email protected], [email protected]
M. Cuntz
Affiliation:
Department of Physics, University of Texas at Arlington, Arlington, TX 76019-0059, USA email: [email protected]
V. L. Kashyap
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA email: [email protected], [email protected]
J. C. Hall
Affiliation:
Lowell Observatory, Flagstaff, AZ 86001, USA email: [email protected]
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Abstract

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We present the first observation of planet-induced stellar X-ray activity, identified for the HD 179949 system, using Chandra / ACIS-S. The HD 179949 system consists of a close-in giant planet orbiting an F9 V star. Previous ground-based observations already showed enhancements in Ca II K in phase with the planetary orbit. We find an ∼30% increase in the X-ray flux over quiescent levels coincident with the phase of the Ca II enhancements. There is also a trend for the emission to be hotter at increased fluxes, confirmed by modeling, showing the enhancement at ∼1 keV compared to ∼0.4 keV for the background star.

Keywords

Planetary systemsstars: activitystars: coronaestars: individual (HD 179949)stars: late-typestars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S249: Exoplanets: Detection, Formation and Dynamics , October 2007 , pp. 79 - 81
Copyright
Copyright © International Astronomical Union 2008

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