Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546406f&link_type=abstract
American Astronomical Society, AAS Meeting #215, #464.06; Bulletin of the American Astronomical Society, Vol. 42, p.499
Astronomy and Astrophysics
Astronomy
Scientific paper
We present initial results from an HST Cycle 17 program to search for atomic and molecular emissions from the well-studied transiting planet HD209458b. HD209248b is a hot-Jupiter (M 0.7 MJ) known to have a hydrogen-rich atmosphere. We describe recent observations with the HST/Cosmic Origins Spectrograph aimed at detecting molecular hydrogen and/or atomic emission from aurorae present in the planet's atmosphere. We use a total of 12 orbits to acquire moderate resolution (R 20,000) far-UV (1140 - 1750 A) spectra at both the Phase 0.25 and Phase 0.75 quadrature positions. We have used high-quality spectra of a template G0V star (alpha Cen) to identify stellar features that may overlap with planetary signal. We also describe a model for H2 emission from the Jovian aurora/dayglow that has been adapted for the interpretation of the COS spectra.
France Kevin
Froning Cynthia S.
Green James C.
Keeney Brian A.
Linsky Jeffrey L.
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