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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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Tregloan-Reed, J. (författare)
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Southworth, J. (författare)
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Mancini, L. (författare)
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Molliere, P. (författare)
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- Ciceri, Simona (författare)
- Stockholms universitet,Institutionen för astronomi
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Bruni, I. (författare)
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Ricci, D. (författare)
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Ayala-Loera, C. (författare)
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Henning, T. (författare)
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(creator_code:org_t)
- 2017-12-06
- 2018
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 474:4, s. 5485-5499
- Relaterad länk:
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http://eprints.keele...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- techniques: photometric
- planets and satellites: atmospheres
- planets and satellites: gaseous planets
- stars: fundamental parameters
- stars: individual: HAT-P-32
- Aplanetary systems
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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