X-RAY ACTIVITY PHASED WITH PLANET MOTION IN HD 189733?

Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/741/1/L18· OSTI ID:21565347

Pillitteri, I; Guenther, H M; Wolk, S J; Kashyap, V L; Cohen, O ^[1]

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1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

We report on the follow-up XMM-Newton observation of the planet-hosting star HD 189733 we obtained in 2011 April. 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 means of high-resolution X-ray spectroscopy with the Reflection Grating Spectrometer on board XMM-Newton, we determine that the corona of this star is unusually dense.

• OSTI ID: 21565347
• Journal Information: Astrophysical Journal Letters, Vol. 741, Issue 1; Other Information: DOI: 10.1088/2041-8205/741/1/L18; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
INTERACTIONS
MAGNETIC FIELDS
PLANETS
STARS
STELLAR CORONAE
X-RAY SPECTROSCOPY
ATMOSPHERES
SPECTROSCOPY
STELLAR ATMOSPHERES