First complete transit observation of the 111-day-period planet HD80606b

Details First complete transit observation of the 111-day-period planet HD80606b First complete transit observation of the 111-day-period planet HD80606b

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop..540h&link_type=abstract

Spitzer Proposal ID #540

Computer Science

Scientific paper

Due to its high-eccentricity 111-day-period orbit, HD80606b is an extreme planet, going from hot-Jupiters mode to a much cooler regime near the habitable zone. Its transiting nature was recently established by ground observations, including the photometric and spectroscopic data we secured at Haute-Provence Observatory, covering a part of this extremely long-duration transit (about 12 hours). The fortunate properties of HD80606b provides an amazing opportunity to challenge the field of exoplanets characterization. There is intense interest in obtaining a first complete transit of HD80606b with Spitzer. However, the end of the "Cold Spitzer" made impossible its scheduled observation. We thus propose to observe with IRAC onboard the "Warm Spitzer" the complete transit of HD80606b expected on January 13-14, 2010, which will produce the best-quality transit light curve ever obtained from any extrasolar planet. We will simultaneously conduct a photometric and spectroscopic campaign from ground, at that date and the weeks around. This full dataset will allow system parameters to be accurately measured, including stellar and planetary masses, radii and densities, orbit inclination and eccentricity, or spin-orbit misalignment angle. They are fundamental parameters to understand the origin and the evolution of this system. Such well-observable transits of HD80606b are extremely rare, and opportunities should not be missed. Together with complementary ground observations, the Spitzer January 2010 complete transit light curve of this exceptional object will provide a long-term legacy value.

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