Third Time's the Charm: The Tidal Q, Heating and Spin of HD 80606b

Astronomy and Astrophysics – Astronomy

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Scientific paper

We propose to obtain a 50-hour, 3.6-micron photometric time series of the highly eccentric HD 80606 planetary system during the planetary periastron passage which will occur on June 17th-19th 2012. The observations will commence 15 hours prior to periastron (12 hours prior to secondary eclipse), and will end 35 hours after periastron. These observations, in conjunction with the 4.5-micron and 8-micron time series that we obtained in GO-4 and GO-6, will allow us to (1) confirm the tidal heating rate in the planet, (2) measure the radiative time scale at the pressure depth of the planet's 3.5-micron photosphere, and (3) directly measure the rotation rate of the planet. The HD 80606 system is the best example of a planet that owes it's orbit to the process of Kozai migration with tidal friction. This process is now believed to have produced a substantial fraction of the short-period hot-Jupiter type planets that have been discovered over the past 15 years.

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