J Tregloan-Reed
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; Ricci, D; Ayala-Loera, C; Henning, T
Authors
Dr John Taylor j.k.taylor@keele.ac.uk
L Mancini
P Mollière
S Ciceri
I Bruni
D Ricci
C Ayala-Loera
T Henning
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??Jup. 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.
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 29, 2017 |
Online Publication Date | Dec 6, 2017 |
Publication Date | 2018-03 |
Publicly Available Date | May 26, 2023 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Publisher | Oxford University Press |
Peer Reviewed | Peer Reviewed |
Volume | 474 |
Issue | 4 |
Pages | 5485 - 5499 |
DOI | https://doi.org/10.1093/mnras/stx3147 |
Keywords | techniques, photometric, planets and satellites, atmospheres, planets and satellites, gaseous planets, stars, fundamental parameters, individual, HAT-P-32?A, planetary systems |
Publisher URL | http://dx.doi.org/10.1093/mnras/stx3147 |
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