Journal
ASTRONOMY & ASTROPHYSICS
Volume 493, Issue 2, Pages L31-L34Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200811268
Keywords
binaries: eclipsing; planetary systems; stars: individual: OGLE-TR-56; techniques: photometric
Categories
Funding
- CNES
- NASA through Hubble Fellowship [HF-01210.01-A]
- STScI
- AURA, Inc [NAS5-26555]
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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% from the combined Magellan and VLT datasets, which indicates a blackbody brightness temperature of 2718(-107)(+127) 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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