The extended chromosphere of CoRoT-2A Discovery and analysis of the chromospheric Rossiter-McLaughlin effect

被引：19

作者：

Czesla, S. ^{[1
]}

Schroeter, S. ^{[1
]}

Wolter, U. ^{[1
]}

von Essen, C. ^{[1
]}

Huber, K. F. ^{[1
]}

Schmitt, J. H. M. M. ^{[1
]}

Reichart, D. E. ^{[2
]}

Moore, J. P. ^{[2
]}

机构：

[1] Univ Hamburg, Hamburger Sternwarte, D-21029 Hamburg, Germany

[2] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2012年 / 539卷

基金：

美国国家科学基金会;

关键词：

stars: individual: CoRoT-2A; planetary systems; stars: late-type; TRANSITING EXOPLANETS; CROSS-CORRELATION; PLANET COROT-2B; SPACE MISSION; ATMOSPHERE; EMISSION; VELOCITY; SPECTRA; STARS; SPECTROSCOPY;

D O I：

10.1051/0004-6361/201118042

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：9

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