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HST/FGS High-Speed Photometric Observations of Transits of HD 209458b

  • William F. Welsh (a1), A. B. Schultz (a2), W. Kinzel (a2), M. Kochte (a2), I. Jordan (a2), F. Hamilton (a2), F. Bruhweiler (a3), H. Hart (a4), D.P. Hamilton (a5), G. Henry (a6), C. Miskey (a7), M. Rodrigue (a8), D. Bennum (a8), J. Rassuchine (a8), A. Storrs (a9), S. Vogt (a10), J. A. Orosz (a11) and R. Wittenmyer (a11)...

Abstract

We present preliminary analysis of new HST observations of the transiting extrasolar planet HD 209458b. Photometric observations were obtained with the Fine Guidance Sensor (FGS) on the Hubble Space Telescope (HST), providing milli-mag precision and high time resolution (40 Hz). The FGS photometry allows us to derive precise stellar/orbital parameters (ephemeris, inclination, limb darkening) and planetary radius, and also allows a search for the presence of planetary rings and satellites. We discuss preliminary results and two approaches to modelling the observations.

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References

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