Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012a%26a...539a.150c&link_type=abstract
Astronomy & Astrophysics, Volume 539, id.A150
Astronomy and Astrophysics
Astrophysics
Stars: Individual: Corot-2A, Planetary Systems, Stars: Late-Type
Scientific paper
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.
Based on observations obtained with UVES at the ESO VLT Kueyen telescope (program ID 385.D-0426).
Czesla Stefan
Huber K. F.
Moore Justin P.
Reichart Dan E.
Schmitt Juergen H. M. M.
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