Measuring the Physical Properties of the first two WASP transiting extrasolar planets

Details Measuring the Physical Properties of the first two WASP transiting extrasolar planets Measuring the Physical Properties of the first two WASP transiting extrasolar planets

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop11072h&link_type=abstract

HST Proposal ID #11072. Cycle 15

Physics

Scientific paper

We have recently discovered the first two transiting extrasolar planets from the Wide Angle Search for Planets WASP project and confirmed both as planets using SOPHIE radial velocity measurements. Both WASP-1b and WASP-2b orbit about stars brighter than V=12, and are thus ideal targets for HST followup. WASP-1b is probably inflated in a manner similar to HD209458b but is in a closer orbit about the parent, which itself is the earliest-type parent star yet announced for a transiting extrasolar planet. At 0.03 AU from the parent star, WASP-2b is close to the minimum separation at which planets of this mass range are thought to survive. We request DD observations of WASP-1b and WASP-2b, to constrain the masses and radii of both objects to a precision of a few tenths of a percent. Both parent stars have very similar brightnesses to the TrES-1 parent star, thus we will achieve equivalent photometric precision to previous successful observations of TrES-1b. As all further physical investigations such as interior heating depend on precise mass- and radius-determinations, this investigation is the essential next step in uncovering the physical characteristics of these planets and their parent stars. We have requested 12 orbits, though 9 orbits would provide the minimum acceptable coverage for our program. The consortium will formally announce the discoveries of WASP-1b and WASP-2b on Tuesday 26th September 2006. We ask that all material in this proposal be kept confidential until that date. We can supply the discovery paper on request after this date.

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