Journal
ASTRONOMY & ASTROPHYSICS
Volume 585, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201526313
Keywords
planets and satellites: individual: TrES-3b; planets and satellites: atmospheres; stars: individual: TrES-3; techniques: photometric; techniques: spectroscopic; methods: statistical
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Funding
- Leverhulme Research Project [RPG-2012-661]
- French Agence Nationale de la Recherche (ANR) [ANR-12-BS05-0012 Exo-atmos]
- Spanish MINECO [ESP2013-48391-C4-2-R, ESP2014-57495-C2-1-R]
- STFC [ST/K00106X/1, ST/N000919/1] Funding Source: UKRI
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Aims. We search for Rayleigh scattering and K and Na absorption signatures from the atmosphere of TrES-3b using ground-based transmission spectroscopy covering the wavelength range from 530 to 950 nm as observed with the OSIRIS instrument at the Gran Telescopio CANARIAS. Methods. Our analysis is based on a Bayesian approach where the light curves covering a set of given passbands are fitted jointly with PHOENIX-calculated stellar limb darkening profiles. The analysis is carried out assuming both white and red noise that is temporally correlated, with two approaches (Gaussian processes and divide-by-white) to account for the red noise. Results. An initial analysis reveals a transmission spectrum that shows a strong Rayleigh-like increase in extinction towards the blue end of the spectrum, and enhanced extinction around the K I resonance doublet near 767 nm. However, the signal amplitudes are significantly larger than expected from theoretical considerations. A detailed analysis reveals that the K I-like feature is entirely due to variability in the telluric O-2 absorption, but the Rayleigh-like feature remains unexplained.
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