Thermal Inversion in the atmosphere of XO-3b

Details Thermal Inversion in the atmosphere of XO-3b Thermal Inversion in the atmosphere of XO-3b

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop..525m&link_type=abstract

Spitzer Proposal ID #525

Physics

Scientific paper

We propose to observe the secondary eclipse of exoplanet XO-3b with all four IRAC bands in two 6.9 hour runs (13.8 hours total on target time) to detect thermal radiation from the planet and infer the presence of a thermal inversion in the planetary atmosphere. XO-3b is an unique planet with a high mass Mp = 12.5 MJup (Johns-Krull et al. 2008, Hebrard et al. 2008), which is close to the deuterium burning limit and so far has the highest observed surface gravity, g = 209 m.s^(-2) amongst the known transiting planets. Its orbit has eccentricity e = 0.287 +/- 0.005 (Hebrard et al. 2008), which causes stellar irradiance to vary three-fold over the entire orbit. The planet is further likely to revolve around the star on an almost polar orbit with a 70 deg +/- 15 deg inclination angle relative to the stellar equatorial plane (Hebrard et al. 2008). Of the 11 transiting planets with measured Rossitter-McLaughlin effect XO-3b is the only one with a nearly polar orbit, thus XO-3b represents a new orbital mode of transiting Hot Jupiters.

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