Strong Limits on the Infrared Spectrum of HD 209458 b Near 2.2 Micron

Details Strong Limits on the Infrared Spectrum of HD 209458 b Near 2.2 Micron Strong Limits on the Infrared Spectrum of HD 209458 b Near 2.2 Micron

2003-11-03

arxiv.org/abs/astro-ph/0311036v1

Astronomy and Astrophysics

Astrophysics

Brief summary of results discussed in Richardson, Deming, and Seager (2003, ApJ, 597, 581). This is a summary of a poster pres

Scientific paper

We present a brief summary of observations of the transiting extrasolar planet, HD 209458 b, designed to detect the secondary eclipse. We employ the method of `occultation spectroscopy', which searches in combined light (star and planet) for the disappearance and reappearance of weak infrared spectral features due to the planet as it passes behind the star and reappears. We have searched for a continuum peak near 2.2 micron (defined by CO and H2O absorption bands), as predicted by some models of the planetary atmosphere to be approximately 6E-4 of the stellar flux, but no such peak is detected at a level of about 3E-4 of the stellar flux. Our results represent the strongest limits on the infrared spectrum of the planet to date and carry significant implications for understanding the planetary atmosphere.

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