Statistics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50517h&link_type=abstract
Spitzer Proposal ID #50517
Statistics
Scientific paper
We propose a Target of Opportunity (ToO) program to observe photometric eclipses and transits of new extrasolar planets. The measurements constrain models of composition, chemistry, and atmospheric dynamics. We will populate a figure of predicted equillibrium vs. observed brightness temperature, which is starting to show a separate class of chemically-distinct planets. The events also inform follow-on work. As Spitzer's cryogen dwindles, rapid response is crucial. Well below Spitzer's nominal sensitivity, these measurements require optimized observing and analysis techniques. Our goals, begun with our Cycle-3 and -4 ToO programs and continued here, are to ensure that each bandpass is observed for every planet with good predicted S/N, to obtain the best possible observations, to make these high-impact data public for everyone to use in planning followups, and to make the process of observing exoplanets smooth for observers and Spitzer by allocating a predictable number of events for the community through the TAC process. Based on discovery statistics, 20-30 new transiting planets will be announced in 2008. Of these, 1-2 might be bright enough for six bandpasses, and many more will be observable in one or more IRAC bands. We thus request 120 hours to cover ~17 7:40-hour eclipse events in low-impact ToOs. This will cover 3-6 planets in all useful bands, depending on their brightnesses. We give criteria for activating ToOs, focusing on bright/unusual objects (eccentric, hot, cool, small, etc.). Our Legacy product is archivally-prepared calibrated lightcurves, submitted as electronic attachments with journal articles. Transiting extrasolar planets are among the least anticipated, most productive, and most publicly stimulating targets for Spitzer. These direct measurements provide the only emission fluxes possible with current telescopes for extrasolar planets, and stand as a Spitzer legacy for posterity. No comparable opportunity to observe exoplanets will be available until JWST.
Bakos Gaspar
Deming Drake
Fischer Debra
Gillon Michael
Harrington Joseph
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