A precise optical transmission spectrum of the inflated exoplanet WASP-52b
| Autor: | Patrick G. J. Irwin, Ian Skillen, Tom Louden, James Kirk, Peter J. Wheatley |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Earth and Planetary Astrophysics (astro-ph.EP) 010504 meteorology & atmospheric sciences Opacity business.industry FOS: Physical sciences Astronomy and Astrophysics Scale height Astrophysics Light curve 01 natural sciences Exoplanet Wavelength Optics Space and Planetary Science 0103 physical sciences Hot Jupiter William Herschel Telescope Astrophysics::Earth and Planetary Astrophysics business 010303 astronomy & astrophysics Noise (radio) 0105 earth and related environmental sciences Astrophysics - Earth and Planetary Astrophysics |
| Popis: | We have measured a precise optical transmission spectrum for WASP-52b, a highly inflated hot Jupiter with an equilibrium temperature of 1300 K. Two transits of the planet were observed spectroscopically at low resolution with the auxiliary-port camera (ACAM) on the William Herschel Telescope (WHT), covering a wide range of 4000-8750 ��. We use a Gaussian process approach to model the correlated noise in the multi-wavelength light curves, resulting in a high precision relative transmission spectrum with errors on the order of a pressure scale height. We attempted to fit a variety of different representative model atmospheres to the transmission spectrum, but did not find a satisfactory match to the entire spectral range. For the majority of the covered wavelength range (4000-7750 ��) the spectrum is flat, and can be explained by an optically thick and grey cloud layer at 0.1 mbar, but this is inconsistent with a slightly deeper transit at wavelengths $> 7750$ ��. We were not able to find an obvious systematic source for this feature, so this opacity may be the result of an additional unknown absorber. Submitted to MNRAS 17 Jan 2017, revised version after comments from reviewer, 12 pages, 10 figures |
| Databáze: | OpenAIRE |
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