The Radius of the "Super-Neptune" HD 149026b

Details The Radius of the "Super-Neptune" HD 149026b The Radius of the "Super-Neptune" HD 149026b

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11165w&link_type=abstract

HST Proposal ID #11165. Cycle 16

Physics

Scientific paper

Current measurements suggest that the transiting exoplanet HD 149026b is a "super-Neptune," with an enormous heavy-element core. The existence of such a planet is a major challenge to planet formation theories. We propose to place the radius measurement on much firmer footing, by obtaining a NICMOS light curve with 0.4 mmag precision and 13 sec cadence. We will improve the radius measurement by a factor of 2.3, and more importantly, the result will be more robust because we will determine the stellar radius directly from the data. Numerous attempts to do this from the ground have failed.;

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