First observation of planet-induced X-ray emission: The system HD 179949
Abstract
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.
- Publication:
-
Exoplanets: Detection, Formation and Dynamics
- Pub Date:
- May 2008
- DOI:
- 10.1017/S1743921308016414
- arXiv:
- arXiv:0712.3270
- Bibcode:
- 2008IAUS..249...79S
- Keywords:
-
- Planetary systems;
- stars: activity;
- stars: coronae;
- stars: individual (HD 179949);
- stars: late-type;
- stars: magnetic fields;
- Astrophysics
- E-Print:
- 3 pages, 1 figure