Direct radius measurement of the Neptune-size transiting exoplanet GJ436b

Details Direct radius measurement of the Neptune-size transiting exoplanet GJ436b Direct radius measurement of the Neptune-size transiting exoplanet GJ436b

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop11306p&link_type=abstract

HST Proposal ID #11306. Cycle 15

Computer Science

Scientific paper

We propose to measure the radius of the first transiting Neptune-class extrasolar planet, GJ 436b. The transits of this 22-Earth-mass planet around a nearby M dwarf were recently detected by our team. Ground-based photometric observations indicate a planet size compatible with a Neptune-like structure or an "Ocean Planet". A direct radius determination from an HST infrared lightcurve will provide a much more direct measurement of the radius and density of the planet. GJ 436b is the nearest known transiting exoplanet, as well as the smallest and lightest, by a large margin. The high planet-to-star contrast in the infrared make it very favorable for detailed studies. NICMOS 1-2 microns observations, in addition to measuring its size, may reveal water absorption from its outer atmosphere.;

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