X-ray activity phased with planet motion in HD 189733?
I. Pillitteri, H. M. Guenther, S. J. Wolk, V. Kashyap, O. Cohen
TL;DR
This study reports repeated X-ray flares from HD 189733 that are potentially linked to the planet's orbital phase, suggesting magnetic interactions between the star and its hot Jupiter.
Contribution
It provides evidence for phase-locked stellar activity possibly caused by magnetic interactions with the orbiting planet, supported by repeated flare observations and high-resolution spectroscopy.
Findings
Repeated X-ray flares near planetary transit phases
Coronal density of HD 189733 is unusually high
Potential magnetic star-planet interaction inferred
Abstract
We report on the follow-up XMM-Newton observation of the planet-hosting star HD 189733 we obtained in April 2011. We observe a flare just after the secondary transit of the hot Jupiter. This event shares the same phase and many of the characteristics of the flare we observed in 2009. We suggest that a systematic interaction between planet and stellar magnetic fields when the planet passes close to active regions on the star can lead to periodic variability phased with planetary motion. By mean of high resolution X-ray spectroscopy with RGS we determine that the corona of this star is unusually dense.
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