Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9171s&link_type=abstract
HST Proposal ID #9171
Computer Science
Hst Proposal Id #9171 Cold Stars
Scientific paper
HD 209458b is the only extrasolar giant planet {EGP} detected that has an orbit inclined enough toward the Sun for the transits to be detected. Differential photometry of HD 209458 with respect to comparison stars showed a transit depth of 1.5 a transit time of 3.2 hours. Transit ingress and egress are 25 minutes in duration suggesting the planet transits along a short chord instead of the full stellar disk. We propose to observe the transit ingress {1-orbit} and egress {1-orbit} with a Fine Guidance Sensor {FGS} used as a high- speed photometer {40 Hz}. An FGS can be used to obtain relative photometry with better than milli-mag accuracy and one-minute time resolution. FGS photometry of the ingress and egress will allow an independent determination of the planet radius and the inclination of the orbit. We also propose to observe the ingress and egress at least five times during Cycle 10 {10 orbits requested} to determine any variability of transit times that would indicate precession of the orbit caused by secondary bodies in the HD 209458 system. As a secondary goal, we will search for structure in the photometry that would indicate the presence of planetary satellites.
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