The Search for an Atmospheric Signature of the Transiting Exoplanet HD 149026b

Details The Search for an Atmospheric Signature of the Transiting Exoplanet HD 149026b The Search for an Atmospheric Signature of the Transiting Exoplanet HD 149026b

2006-09-18

arxiv.org/abs/astro-ph/0609513v1

Astronomy and Astrophysics

Astrophysics

8 pages, 10 figures, 2 tables

Scientific paper

10.1086/508237

HD 149026b is a short-period, Saturn-mass planet that transits a metal-rich star. The planet's radius, determined by photometry, is remarkably small compared to other known transiting planets, with a heavy-element core that apparently comprises ~70% of the total planet mass. Time-series spectra were obtained at Keck before and during transit in order to model the Rossiter-McLaughlin effect. Here we make use of these observations to carry out a differential comparison of spectra obtained in and out of transit to search for signatures of neutral atomic lithium and potassium from the planet atmosphere. No signal was detected at the 2% level; we therefore place upper limits on the column density of these atoms.

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