A HIRES/Keck Spectroscopic Investigation of the Measurement of Sodium in the Atmosphere of HD 209458b

Details A HIRES/Keck Spectroscopic Investigation of the Measurement of Sodium in the Atmosphere of HD 209458b A HIRES/Keck Spectroscopic Investigation of the Measurement of Sodium in the Atmosphere of HD 209458b

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...696.1355l&link_type=abstract

The Astrophysical Journal, Volume 696, Issue 2, pp. 1355-1366 (2009).

Astronomy and Astrophysics

Astronomy

4

Planetary Systems, Stars: Atmospheres, Stars: Individual: Hd 209458, Techniques: Photometric

Scientific paper

We present high-resolution High Resolution Echelle Spectrometer (HIRES)/Keck spectra of HD 209458, and a Monte Carlo variation on the basic method used by other workers, to look for the excess in-transit absorption in the NaD doublet at 5893 Å due to the extrasolar planet. The HIRES data, binned by bandpass, allow a direct comparison with previous results. We find >3σ results in most test bandpasses around the NaD doublet, including relative absorption of (-108.8 ± 25.7) × 10-5 in the "narrow" bandpass used by other workers. This is ≈4.7 times larger than the "narrow" results reported by Charbonneau et al. for HD 209458b. However, >2σ absorption is detected in some weak Fe I and Ni I lines that were tested for comparison, raising concern about the uncertainties introduced by continuum-fitting and terrestrial atmosphere subtraction.
Based on data obtained with the W. M. Keck Observatory, which is operated by a partnership consisting of the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration.

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