HD 189733b: As The World Turns

Details HD 189733b: As The World Turns HD 189733b: As The World Turns

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30825c&link_type=abstract

Spitzer Proposal ID #30825

Computer Science

Performance

Scientific paper

We propose to monitor the closest and brightest transiting exoplanet system for a time of 33 hours, from just before the start of transit, to just after the end of secondary eclipse. Our primary science goal is the measurement of the planetary phase function, which is the modulation induced by the changing face of the planet as it orbits the parent star. Our secondary science goals are the ultra precise monitoring of the transit shape and the secondary eclipse curve. Our requisite photometric precision has already been demonstarted with recent observations, and we outline modest changes that will further increase the performance. Our proposed observations present an exciting opportunity to shed light, for the first time, on hot Jupiter weather patterns, and will extend the realm of planetary meteorology to other Solar systems. Specifically, our observations have the potential to determine (i) the day-night temperature difference, (ii) the temperature pattern, in particular whether the temperatures are swept eastward as predicted by recent theoretical modeling, and (iii) the directions of the km/s winds themselves. Observation of the longitudinal temperature structure will also inform debates about cloud patterns, disequilibrium chemistry, and the influence (if any) of atmospheric dynamics on long-term planetary evolution.

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