Subaru HDS Transmission Spectroscopy of the Transiting Extrasolar Planet HD 209458b

Abstract

We have searched for absorption in several common atomic species due to the atmosphere or exosphere of the transiting extrasolar planet HD 209458b, using high precision optical spectra obtained with the Subaru High Dispersion Spectrograph (HDS). Previously we reported an upper limit on H alpha absorption of 0.1% (3 sigma) within a 5.1Åband. Using the same procedure, we now report upper limits on absorption due to the optical transitions of Na D, Li, H alpha, H beta, H gamma, Fe, and Ca. The 3 sigma upper limit for each transition is approximately 1% within a 0.3Åband (the core of the line), and a few tenths of a per cent within a 2Åband (the full line width). The wide-band results are close to the expected limit due to photon-counting (Poisson) statistics, although in the narrow-band case we have encountered unexplained systematic errors at a few times the Poisson level. These results are consistent with all previously reported detections and upper limits, but are significantly more sensitive.

10 pages, 9 figures

References in corpus (6)

• Detection of oxygen and carbon in the hydrodynamically escaping atmosphere of the extrasolar planet HD209458b
• TrES-1: The Transiting Planet of a Bright K0V Star
• The Rossiter-McLaughlin effect and analytic radial velocity curves for transiting extrasolar planetary systems
• A new powerful method for probing the atmospheres of transiting exoplanets
• A new Search for Carbon Monoxide Absorption in the Transmission Spectrum of the Extrasolar Planet HD 209458b
• A Search for H-alpha Absorption in the Exosphere of the Transiting Extrasolar Planet HD 209458b

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