HD80606b Transit Observed by MOST

Details HD80606b Transit Observed by MOST HD80606b Transit Observed by MOST

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.2710r&link_type=abstract

American Astronomical Society, DPS meeting #42, #27.10; Bulletin of the American Astronomical Society, Vol. 42, p.1061

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Scientific paper

We present our results of the observations taken by the MOST telescope of the occultation and the full 12 hour transit of HD80606b, which occurred on January 8th and 14th, 2010 respectively. With its unusually high eccentricity of 0.9336, HD80606b challenges our understanding of the evolution of planetary systems. Furthermore, with its large variance of distance from its star, the atmospheric dynamics of HD80606b are likely to be different from any other exoplanet discovered to date. By constraining the parameters of this system, we will better understand the dynamics of this planet and will improve numerous planetary models. We determine a best fit of the primary transit for the stellar and planetary radius, inclination, and limb darkening parameters. We also fit for the albedo and temperature of the secondary eclipse, which is of great interest as these two variables are likely to vary enormously during the planet's 111.436 day orbit. The difficulty in constraining our fits comes from an insufficiently understood mass of HD80606. Reported masses for HD80606 range from 0.9 to 1.1 solar masses. We therefore determine best fits of the previously listed parameters for different stellar masses within this range. By fitting for the time at transit and occultation, we determine the best argument of periapsis, a variable whose reported value varies largely. Lastly, we compare our results to those determined by ground-based telescopes and by Spitzer to better constrain HD80606b's parameters as the ground-based and Spitzer results vary largely.

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