The Big Swing: Observing the Periastron Passage of HD 80606b

Details The Big Swing: Observing the Periastron Passage of HD 80606b The Big Swing: Observing the Periastron Passage of HD 80606b

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40386l&link_type=abstract

Spitzer Proposal ID #40386

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Scientific paper

The extrasolar planet HD 80606b will pass within 7 stellar radii of its star at periastron passage on Nov 20, 2007. The event will last about 30 hours. At periastron the planet will be subject to irradiation over one hemisphere amounting to one thousand times the solar flux received at Earth. We have modeled the time dependent radiative response of the planet's atmosphere to this strong forcing, and we find that the response will be observable by Spitzer. IRAC observations at 4.5 and 8 microns will allow us to determine the radiative time constant in the planet's atmosphere, a crucial input needed for proper theoretical interpretation of many other Spitzer exoplanet results. We will observe this event using a continuous 30-hour sequence of observations in stellar mode.

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