Balancing the Budget: Simultaneous Near- and Mid-IR Phase Curves of WASP-12b

Details Balancing the Budget: Simultaneous Near- and Mid-IR Phase Curves of WASP-12b Balancing the Budget: Simultaneous Near- and Mid-IR Phase Curves of WASP-12b

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70060m&link_type=abstract

Spitzer Proposal ID #70060

Computer Science

Scientific paper

We propose to observe a 3.6 micron and a 4.5 micron phase curve (65.0 hours total) of WASP-12b, one of the most the highly irradiated (~10 x 109 ergs cm-2 s-1 ) and shortest-period (P ~1.09 d) exoplanets discovered to date. Each 32.5 hour phase curve will start before the secondary eclipse of WASP-12b and will last for more than a full period, allowing us to observe the transit and subsequent secondary eclipse. Each of these phase curves - weather permitting - will be accompanied by simultaneous ground-based full-night (~8 hour) phase curve measurements in the Ks (~2 micron) and H-bands (~1.6 micron) using the Wide-Field Infrared Camera (WIRCam) on the Canada-France-Hawaii Telescope (CFHT). Obtaining four phase curve measurements from wavelengths spanning 1.5 - 5 micron will allow an unprecendented understanding of the energy budget, radiative transfer, and dynamics of the deep, high pressure atmosphere of this hot Jupiter. Specifically the 3.6 and 4.5 micron IRAC phase curve observations that we propose here will allow us to measure the longitudinal variation of WASP-12b's thermal emission as well as determine the dayside and nightside brightness temperature of this very highly irradiated hot Jupiter. With each of our four phase curves we will be able to observe the phase lag of the hottest point of the planet, and thus measure how far downwind the hottest layer of the atmosphere is blown at the four different atmospheric layers we probe here. An additional epoch of observations will also constrain the precession rate of WASP-12b.

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