Status Report

A New Transiting Extrasolar Giant Planet

By SpaceRef Editor
January 7, 2003
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Astrophysics, abstract

From: Dimitar Sasselov <>
Date: Sat, 4 Jan 2003 00:45:18 GMT (99kb)

A New Transiting Extrasolar Giant Planet

M. Konacki (Caltech),
G. Torres (CfA),
S. Jha (CfA/UC-Berkeley),
D. Sasselov (CfA)

Comments: 8 pages, 2 figures, to appear in Nature on 30 January 2003

We have measured radial velocities of a star, OGLE-TR-56, which shows a
1.2-day transit-like light curve found photometrically by Udalski et
al.(2002ab). Here we show that the velocity changes we detect are probably
induced by an object of 0.9 Jupiter masses – a very close-in gas-giant planet
only 0.023 AU from its star, with a planetary radius of 1.3 Jupiter radii and a
mean density of 0.5 g/cm3. At its small orbital distance, OGLE-TR-56b is hotter
than any known planet, approaching 1900K, but it is stable against long-term
evaporation or tidal disruption.

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