تقرير
Possible detection of a bimodal cloud distribution in the atmosphere of HAT-P-32\,A\,b from multi-band photometry
| العنوان: | Possible detection of a bimodal cloud distribution in the atmosphere of HAT-P-32\,A\,b from multi-band photometry |
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| المؤلفون: | Tregloan-Reed, Jeremy, Southworth, John, Mancini, L., Mollière, P., Ciceri, S., Bruni, I., Ricci, D., Ayala-Loera, C., Henning, T. |
| سنة النشر: | 2017 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | 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 multi-band 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 defocussed photometry technique we were able to obtain an extremely high precision, ground-based transit in the \textit{u}-band (350\,nm), with an rms scatter of $\approx 1$\,mmag. All 11 transits were modelled using \textsc{prism} and \textsc{gemc}, and the physical properties of the system calculated. We find the mass and radius of the host star to be $1.182\pm 0.041\Msun$ and $1.225\pm0.015\Rsun$, respectively. For the planet we find a mass of $0.80\pm 0.14\Mjup$, a radius of $1.807\pm0.022\Rjup$ and a density of $0.126\pm0.023\pjup$. These values are consistent with those found in the literature. We also obtain a new orbital ephemeris for the system $ T_0 = {\rm BJD/TDB} \,\, 2\,454\,420.447187 (96) \, + \,2.15000800 (10) \times 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. Comment: 17 pages, 7 figures and 8 tables. Accepted for publication in MNRAS on 2017 November 29 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stx3147 |
| URL الوصول: | http://arxiv.org/abs/1712.00415 |
| رقم الأكسشن: | edsarx.1712.00415 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stx3147 |
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