Ground-based secondary eclipse detection of the very-hot Jupiter OGLE-TR-56b

Details Ground-based secondary eclipse detection of the very-hot Jupiter OGLE-TR-56b Ground-based secondary eclipse detection of the very-hot Jupiter OGLE-TR-56b

2009-01-13

arxiv.org/abs/0901.1876v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

4 pages, 4 figures, accepted for publication on A&A Letters

Scientific paper

10.1051/0004-6361:200811268

We report on the detection of the secondary eclipse of the very-hot Jupiter OGLE-TR-56b from combined z-band time series photometry obtained with the VLT and Magellan telescopes. We measure a flux decrement of 0.0363+/-0.0091 percent from the combined Magellan and VLT datasets, which indicates a blackbody brightness temperature of 2718 (+127/-107) K, a very low albedo, and a small incident radiation redistribution factor, indicating a lack of strong winds in the planet's atmosphere. The measured secondary depth is consistent with thermal emission, but our precision is not sufficient to distinguish between a black-body emitting planet, or emission as predicted by models with strong optical absorbers such as TiO/VO. This is the first time that thermal emission from an extrasolar planet is detected at optical wavelengths and with ground-based telescopes.

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