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Issue A&A
Volume 445, Number 3, January III 2006
Page(s) L27 - L30
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500202



A&A 445, L27-L30 (2006)
DOI: 10.1051/0004-6361:200500202

Letter

The color signature of the transit of HD 209458: discrepancies between stellar atmospheric models and observations

B. Tingley1, 2, C. Thurl1, 2 and P. Sackett1, 2

1  Research School of Astronomy and Astrophysics, ANU Cotter Road, Weston, Canberra ACT 2611, Australia
2  ANU Planetary Science Institute c/o Mount Stromlo Observatory, Cotter Road, Weston ACT 2611, Australia
    e-mail: [tingley;cthurl]@mso.anu.edu.au; Penny.Sackett@anu.edu.au

(Received 29 August 2005 / Accepted 22 October 2005)

Abstract
Exoplanetary transits produce a double-horned color signature that is distinct from both binaries and blends and can thus be used to separate exoplanets from false positives in transit searches. Color photometry with precision sufficient to detect this signal in transits of HD 209458 is available in the literature. Analysis of these observations reveals that, while the signature does exhibit the expected shape, it is significantly stronger than PHOENIX atmospheric models predict.


Key words: stars: planetary systems -- occultations, stars: atmospheres

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