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.
@article{arxiv.0901.1876,
title = {Ground-based secondary eclipse detection of the very-hot Jupiter OGLE-TR-56b},
author = {David K. Sing and Mercedes Lopez-Morales},
journal= {arXiv preprint arXiv:0901.1876},
year = {2009}
}
Comments
4 pages, 4 figures, accepted for publication on A&A Letters