PMO OpenIR  > 分子云与恒星形成研究团组
Physical properties of the WASP-44 planetary system from simultaneous multi-colour photometry
Mancini, L.1; Nikolov, N.1; Southworth, J.2; Chen, G.1,3,4; Fortney, J. J.5; Tregloan-Reed, J.2; Ciceri, S.1; van Boekel, R.1; Henning, Th.1
2013-04-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume430Issue:4Pages:2932-2942
Corresponding AuthorMancini, L (reprint author), Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany. Email: mancini@mpia-hd.mpg.de
AbstractWe present ground-based broad-band photometry of two transits in the WASP-44 planetary system obtained simultaneously through four optical (Sloan g', r', i', z') and three near-infrared (NIR; J, H, K) filters. We achieved low scatters of 1-2 mmag per observation in the optical bands with a cadence of approximate to 48 s, but the NIR-band light curves present much greater scatter. We also observed another transit of WASP-44 b by using a Gunn r filter and telescope defocussing, with a scatter of 0.37 mmag per point and an observing cadence around 135 s. We used these data to improve measurements of the time of mid-transit and the physical properties of the system. In particular, we improved the radius measurements of the star and planet by factors of 3 and 4, respectively. We find that the radius of WASP-44 b is 1.002 +/- 0.033 +/- 0.018 R-Jup (statistical and systematic errors, respectively), which is slightly smaller than previously thought and differs from that expected for a core-free planet. In addition, with the help of a synthetic spectrum, we investigated the theoretically predicted variation of the planetary radius as a function of wavelength, covering the range 370-2440 nm. We can rule out extreme variations at optical wavelengths, but unfortunately our data are not precise enough (especially in the NIR bands) to differentiate between the theoretical spectrum and a radius which does not change with wavelength.
KeywordStars: Fundamental Parameters Stars: Individual: Wasp-44 Planetary Systems
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stt095
WOS KeywordTRANSITING EXTRASOLAR PLANETS ; HUBBLE-SPACE-TELESCOPE ; JUPITER HD 209458B ; LIGHT-CURVE PROJECT ; EARTH GJ 1214B ; GIANT PLANETS ; TRANSMISSION SPECTROSCOPY ; HOT-JUPITER ; MU-M ; SHORT-PERIOD
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000318339700036
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9835
Collection分子云与恒星形成研究团组
Affiliation1.Max Planck Inst Astron, D-69117 Heidelberg, Germany
2.Keele Univ, Astrophys Grp, Newcastle Under Lyme ST5 5BG, Staffs, England
3.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
4.Key Lab Radio Astron, Nanjing 210008, Peoples R China
5.Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
Recommended Citation
GB/T 7714
Mancini, L.,Nikolov, N.,Southworth, J.,et al. Physical properties of the WASP-44 planetary system from simultaneous multi-colour photometry[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,430(4):2932-2942.
APA Mancini, L..,Nikolov, N..,Southworth, J..,Chen, G..,Fortney, J. J..,...&Henning, Th..(2013).Physical properties of the WASP-44 planetary system from simultaneous multi-colour photometry.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,430(4),2932-2942.
MLA Mancini, L.,et al."Physical properties of the WASP-44 planetary system from simultaneous multi-colour photometry".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 430.4(2013):2932-2942.
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