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

Astrophysics, abstract
astro-ph/0504540

From: Norio Narita [view email]

Date: Mon, 25 Apr 2005 14:46:50 GMT   (113kb)

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 5.1\AA band. 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 0.3\AA band (the core of the line), and a few tenths
of a per cent within a 2\AA band (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.

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