Volume 539, March 2012
|Number of page(s)||9|
|Published online||09 March 2012|
The extended chromosphere of CoRoT-2A⋆
Discovery and analysis of the chromospheric Rossiter-McLaughlin effect
1 Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg Germany
2 Department of Physics and Astronomy, University of North Carolina, Chapel Hill, CB 3255, Phillips Hall, Chapel Hill, NC 27599-3255, USA
Received: 7 September 2011
Accepted: 16 January 2012
The young G7V dwarf CoRoT-2A is transited by a hot Jupiter and among the most active planet host-stars known to date. We report on the first detection of a chromospheric Rossiter-McLaughlin effect observed in the Ca ii H and K emission-line cores. In Ca ii H and K, the transit lasts 15% longer than that observed in visual photometry, indicating that chromospheric emission extends 100 000 km beyond the photosphere. Our analysis is based on a time series of high-resolution UVES spectra obtained during a planetary transit and simultaneously obtained photometry observed with one of the PROMPT telescopes. The chromospheric Rossiter-McLaughlin effect provides a new tool to spatially resolve the chromospheres of active planet host-stars.
Key words: stars: individual: CoRoT-2A / planetary systems / stars: late-type
© ESO, 2012
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