The extended chromosphere of CoRoT-2A. Discovery and analysis of the chromospheric Rossiter-McLaughlin effect (original) (raw)

NASA/ADS

;

• Schröter, S. ;
• Wolter, U. ;
• von Essen, C. ;
• Huber, K. F. ;
• Schmitt, J. H. M. M. ;
• Reichart, D. E. ;
• Moore, J. P.

Abstract

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).

Publication:

Astronomy and Astrophysics

Pub Date:

March 2012

DOI:

10.1051/0004-6361/201118042

Bibcode:

2012A&A...539A.150C

Keywords:

• stars: individual: CoRoT-2A;
• planetary systems;
• stars: late-type