Deciphering the atmosphere of HAT-P-12b: solving discrepant results

被引:48
作者
Alexoudi, X. [1 ]
Mallonn, M. [1 ]
von Essen, C. [2 ]
Turner, J. D. [3 ]
Keles, E. [1 ]
Southworth, J. [4 ]
Mancini, L. [5 ,6 ,7 ]
Ciceri, S. [8 ]
Granzer, T. [1 ]
Denker, C. [1 ]
Dineva, E. [1 ]
Strassmeier, K. G. [1 ]
机构
[1] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
[2] Aarhus Univ, SAC, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
[3] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA
[4] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England
[5] Univ Roma Tor Vergata, Dipartimento Fis, Via Ric Sci 1, I-00133 Rome, Italy
[6] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
[7] Osserv Astron Torino, INAF, Via Osservatorio 20, I-10025 Pino Torinese, Italy
[8] Stockholm Univ, Dept Astron, Alba Nova Univ Ctr, S-10691 Stockholm, Sweden
来源
ASTRONOMY & ASTROPHYSICS | 2018年 / 620卷
关键词
planets and satellites: gaseous planets; planets and satellites: atmospheres; stars: individual: HAT-P-12; TRANSITING EXTRASOLAR PLANETS; TRANSMISSION SPECTRAL SURVEY; EXOPLANET HD 189733B; HOT-JUPITER; NEAR-ULTRAVIOLET; TELESCOPE; HUBBLE; WATER; PHOTOMETRY; AEROSOLS;
D O I
10.1051/0004-6361/201833691
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Context. Two independent investigations of the atmosphere of the hot Jupiter HAT-P-12b by two different groups resulted in discrepant solutions. Using broad-band photometry from the ground, one study found a flat and featureless transmission spectrum that was interpreted as gray absorption by dense cloud coverage. The second study made use of Hubble Space Telescope (HST) observations and found Rayleigh scattering at optical wavelengths caused by haze. Aims. The main purpose of this work is to determine the source of this inconsistency and provide feedback to prevent similar discrepancies in future analyses of other exoplanetary atmospheres. Methods. We studied the observed discrepancy via two methods. With further broad-band observations in the optical wavelength regions, we strengthened the previous measurements in precision, and with a homogeneous reanalysis of the published data, we were able to assess the systematic errors and the independent analyses of the two different groups. Results. Repeating the analysis steps of both works, we found that deviating values for the orbital parameters are the reason for the aforementioned discrepancy. Our work showed a degeneracy of the planetary spectral slope with these parameters. In a homogeneous reanalysis of all data, the two literature data sets and the new observations converge to a consistent transmission spectrum, showing a low-amplitude spectral slope and a tentative detection of potassium absorption.
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页数:20
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