The Search for H3+ Towards HD209458

Details The Search for H3+ Towards HD209458 The Search for H3+ Towards HD209458

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004dps....36.3502h&link_type=abstract

American Astronomical Society, DPS meeting #36, #35.02; Bulletin of the American Astronomical Society, Vol. 36, p.1151

Astronomy and Astrophysics

Astronomy

Scientific paper

We present initial results of a search for H3+ in the extended atmosphere towards the giant exoplanet orbiting HD 209458. The observations were taken during 3 transits on June 8, June 15, and July 31, 2004 using NIRSPEC at the Keck II Observatory atop Mauna Kea, Hawaii. NIRSPEC provides high sensitivity and spectral resolution (R ˜ 2.5 × 104). Unfortunately, the instrument filter wheel was stuck in the K-prime position during our June observations, necessitating a search for the 2 ν 22 -> 0 Q(1,0) and Q(3,0) transitions of H3+ lines at 2.04 μ m rather than the stronger ν 2 -> 0 R(1,1)u and R(1,0) transitions near 3.68 μ m. In addition, we also made simultaneous observations of HD 209458 with CSHELL on June 15, which also provides high resolution (R ˜ 2 × 104). Data analysis is complicated by the fact that the Doppler shift of the planet as it orbits the star changes dramatically over the course of the transit, requiring very careful stacking of each data frame. We discuss our procedures, initial results, and plans for future searches of atmospheric constituents of exoplanets.
We would like to acknowledge support from the National Science Foundation AST 02-05881 and NASA Keck through the Michelson Science Center.

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