Transit Timing with Fast Cameras on Large Telescopes

Details Transit Timing with Fast Cameras on Large Telescopes Transit Timing with Fast Cameras on Large Telescopes

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331902a&link_type=abstract

American Astronomical Society, AAS Meeting #213, #319.02; Bulletin of the American Astronomical Society, Vol. 41, p.373

Astronomy and Astrophysics

Astronomy

Scientific paper

We describe a program to obtain high-quality transit light curves using large telescopes with frame-transfer CCDs. Transits have been observed on the 6.5m Magellan telescopes in the south, with both POETS and MagIC, and on the 3.5m IRTF in the north with POETS. We have achieved high precision (a few mmag) with two different types of exoplanets. The first are faint, photon-limited sources with many comparison stars (the OGLE transiting planets), which benefit from a large telescope's increased collecting area. The second type are stars brighter than 12th mag with close comparison stars (within 30-60" due to the small fields of view). We can observe these bright stars on large telescopes because the PSF is spread over many small pixels and because the frame-transfer cameras permit very short exposure times and a duty cycle that is over 99%. We report the transit times and radius ratios for several planets derived from light curves obtained at Magellan and the IRTF, and comment on the future prospects for obtaining high-quality ground based photometry.
This work was supported in part by NASA Origins grant 6915408.

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