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Possible detection of a bimodal cloud distribution in the atmosphere of HAT-P-32Ab from multiband photometry
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Number of Authors: 9
2018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 474, no 4, p. 5485-5499Article in journal (Refereed) Published
Abstract [en]

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 approximate to 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-circle dot and 1.225 +/- 0.015 R-circle dot, respectively. For the planet, we find a mass of 0.80 +/- 0.14 M-Jup, a radius of 1.807 +/- 0.022 R-Jup, and a density of 0.126 +/- 0.023 rho(Jup). These values are consistent with those found in the literature. We also obtain a new orbital ephemeris for the system T-0 = BJD/TDB 2 454 420.447187(96)+2.15000800(10) x E. We measured the transmission spectrum of HAT-P-32Ab 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-32Ab.

Place, publisher, year, edition, pages
2018. Vol. 474, no 4, p. 5485-5499
Keyword [en]
techniques: photometric, planets and satellites: atmospheres, planets and satellites: gaseous planets, stars: fundamental parameters, stars: individual: HAT-P-32, Aplanetary systems
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-153598DOI: 10.1093/mnras/stx3147ISI: 000424977800088OAI: oai:DiVA.org:su-153598DiVA, id: diva2:1190578
Available from: 2018-03-15 Created: 2018-03-15 Last updated: 2018-03-15Bibliographically approved

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Mancini, L.Ciceri, Simona
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