Solving the Mystery of the Largest Transiting Planet

Details Solving the Mystery of the Largest Transiting Planet Solving the Mystery of the Largest Transiting Planet

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop..463c&link_type=abstract

Spitzer Proposal ID #463

Physics

Scientific paper

We have just announced the discovery of TrES-4, which is by far the largest and least dense of the 22 known transiting explanets. The inflated radius is seriously at odds with published models of the physical structure of hot Jupiters, and is an extreme case within the general class of close-in gas giants with very low densities. We propose to determine the broadband spectrum of TrES-4 through precise photometry of the secondary eclipse at 3.6, 4.5, 5.8, 8.0, and 16 microns. These observations will permit a direct test of our team's recent discovery that close-in planets with inflated radii may have atmospheric temperature inversions whereas their non-inflated counterparts do not. If confirmed, this correlation could hold the key to finally unraveling the mystery of the large diversity in the radii of the hot Jupiter exoplanets. We will also confirm or exclude the alternate explanation that the planet is heated through ongoing dissipation of residual orbital eccentricity.

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