First Observation of Planet-Induced X-ray Emission: The System HD 179949

Details First Observation of Planet-Induced X-ray Emission: The System HD 179949 First Observation of Planet-Induced X-ray Emission: The System HD 179949

2007-12-19

arxiv.org/abs/0712.3270v2

Astronomy and Astrophysics

Astrophysics

3 pages, 1 figure; Exoplanets: Detection, Formation and Dynamics, IAU Symposium 249, eds. Y.-S. Sun, S. Ferraz-Mello, and J.-L

Scientific paper

10.1017/S1743921308016414

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 F9V 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.

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