Journal Article

Thermal emission from WASP-33b, the hottest known planet*

A. M. S. Smith, D. R. Anderson, I. Skillen, A. Collier Cameron and B. Smalley

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 416, issue 3, pages 2096-2101
Published in print September 2011 | ISSN: 0035-8711
Published online September 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19187.x
Thermal emission from WASP-33b, the hottest known planet*

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We report ground-based observations at 0.91 μm of the occultation of the hot Jupiter WASP-33b by its A5 host star. We measure the planet to be 0.109 ± 0.030 per cent as bright as its host star at 0.91 μm. This corresponds to a brightness temperature, TB= 3620+200− 250 K, significantly higher than the zero-albedo equilibrium temperature for both isotropic re-radiation (2750 ± 37 K) and uniform day-side-only re-radiation (3271 ± 44 K), but consistent with the zero-redistribution temperature (3515 ± 47 K). This indicates that the heat redistribution from the day side of WASP-33b to the night side is inefficient and further suggests that there is immediate re-radiation, and therefore little or no redistribution, of heat within the day side. We also detected the stellar pulsations of WASP-33, which we model as the sum of four sinusoids, with periods of between 42 and 77 min and amplitudes of 0.5–1.5 mmag.

Keywords: stars: individual: WASP-33; stars: oscillations; planetary systems; stars: variables: δ Scuti; infrared: planetary systems

Journal Article.  4264 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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