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  Possible detection of a bimodal cloud distribution in the atmosphere of HAT-P-32 A b from multiband photometry

Tregloan-Reed, J., Southworth, J., Mancini, L., Mollière, P., Ciceri, S., Bruni, I., et al. (2018). Possible detection of a bimodal cloud distribution in the atmosphere of HAT-P-32 A b from multiband photometry. Monthly Notices of the Royal Astronomical Society, 474, 5485-5499.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CAA2-0 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CAA3-F
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018MNRAS.474.5485T (Any fulltext)
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 Creators:
Tregloan-Reed, J.1, Author
Southworth, J.1, Author
Mancini, L.1, Author
Mollière, P.1, Author
Ciceri, S.1, Author
Bruni, I.1, Author
Ricci, D.1, Author
Ayala-Loera, C.1, Author
Henning, T.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: techniques: photometric planets and satellites: atmospheres planets and satellites: gaseous planets stars: fundamental parameters stars: individual: HAT-P-32 A planetary systems Astrophysics - Earth and Planetary Astrophysics Astrophysics - Solar and Stellar Astrophysics
 Abstract: We present high-precision photometry of eight separate transit events in the HAT-P-32 planetary system. One transit event was observed simultaneously by two telescopes of which one obtained a simultaneous multiband light curve in three optical bands, giving a total of 11 transit light curves. Due to the filter selection and in conjunction with using the defocused photometry technique, we were able to obtain an extremely high-precision, ground-based transit in the u band (350 nm), with an rms scatter of ≈1 mmag. All 11 transits were modelled using PRISM and GEMC, and the physical properties of the system calculated. We find the mass and radius of the host star to be 1.182 ± 0.041 M☉ and 1.225 ± 0.015 R☉, respectively. For the planet, we find a mass of 0.80 ± 0.14 MJup, a radius of 1.807 ± 0.022 RJup, and a density of 0.126 ± 0.023 ρJup. These values are consistent with those found in the literature. We also obtain a new orbital ephemeris for the system T0 = BJD/TDB 2 454 420.447187(96) + 2.15000800(10) × E. We measured the transmission spectrum of HAT-P-32 A b and compared it to theoretical transmission spectra. Our results indicate a bimodal cloud particle distribution consisting of Rayleigh-like haze and grey absorbing cloud particles within the atmosphere of HAT-P-32 A b.

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 Dates: 2018
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 474 Sequence Number: - Start / End Page: 5485 - 5499 Identifier: -