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Refined physical properties and g ', r ', i ', z ', J, H, K transmission spectrum of WASP-23b from the ground
Nikolov, N.1,2; Chen, G.1,3,4; Fortney, J. J.5; Mancini, L.1; Southworth, J.6; van Boekel, R.1; Henning, Th.1
2013-05-01
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume553Pages:23PP
Corresponding AuthorNikolov, N (reprint author), Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany. Email: nikolay@astro.ex.ac.uk
AbstractContext. Multi-band observations of planetary transits using the telescope defocus technique may yield high-quality light curves suitable for refining the physical properties of exoplanets even with small or medium size telescopes. Such observations can be used to construct a broad-band transmission spectrum of transiting planets and search for the presence of strong absorbers. Aims. We have thoroughly characterised the orbital ephemeris and physical properties of the transiting planet and host star in the WASP-23b system, constructed a broad-band transmission spectrum of WASP-23 b and performed a comparative analysis with theoretical models of hot Jupiters. Methods. We observed a complete transit of WASP-23 b in seven passbands simultaneously, using the GROND instrument on the MPG/ESO 2.2m telescope at La Silla Observatory and telescope defocussing. The optical data were taken in the Sloan g', r', i' and z' passbands. The resulting light curves are of high quality, with a root-mean-square scatter of the residual as low as 330 parts per million (ppm) in the z'-band, with a cadence of 90s. Near-infrared data were obtained in the JHK passbands. We performed a MCMC analysis of our photometry plus existing radial velocity data to refine measurements of the ephemeris and physical properties of the WASP-23 system. We constructed a broad-band transmission spectrum of WASP-23 b and compared it with a theoretical transmission spectrum of a hot Jupiter. Results. We measured the central transit time with a precision similar to 8 s. From this and earlier observations we obtain an orbital period of P = 2.9444300 +/- 0.0000011 d. Our analysis also yielded a larger radius and mass for the planet (R-p = 1.067(-0.038)(+0.045) R-Jup and M-p = 0.917(-0.039)(+0.040) M-Jup) compared to previous estimates (R-p = 0.962(-0.056)(+0.047) R-Jup and M-p = 0.884(-0.094)(+0.088) M-Jup). The derived transmission spectrum is marginally flat, which is not surprising given the limited precision of the measurements for the planetary radius and the poor spectral resolution of the data.
KeywordPlanetary Systems Planets And Satellites: Atmospheres Planets And Satellites: Fundamental Parameters Planets And Satellites: General Stars: General
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1051/0004-6361/201321084
WOS KeywordTRANSIT LIGHT-CURVE ; HUBBLE-SPACE-TELESCOPE ; GIANT PLANET TRANSITS ; EXTRASOLAR PLANET ; ATMOSPHERIC HAZE ; HOT JUPITERS ; LOW-MASS ; SYSTEM ; PARAMETERS ; STELLAR
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000319858700026
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9766
Collection暗物质和空间天文实验室
Affiliation1.Max Planck Inst Astron, D-69117 Heidelberg, Germany
2.Univ Exeter, Sch Phys, Astrophys Grp, Exeter EX4 4QL, Devon, 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
6.Keele Univ, Astrophys Grp, Newcastle Under Lyme ST5 5BG, Staffs, England
Recommended Citation
GB/T 7714
Nikolov, N.,Chen, G.,Fortney, J. J.,et al. Refined physical properties and g ', r ', i ', z ', J, H, K transmission spectrum of WASP-23b from the ground[J]. ASTRONOMY & ASTROPHYSICS,2013,553:23PP.
APA Nikolov, N..,Chen, G..,Fortney, J. J..,Mancini, L..,Southworth, J..,...&Henning, Th..(2013).Refined physical properties and g ', r ', i ', z ', J, H, K transmission spectrum of WASP-23b from the ground.ASTRONOMY & ASTROPHYSICS,553,23PP.
MLA Nikolov, N.,et al."Refined physical properties and g ', r ', i ', z ', J, H, K transmission spectrum of WASP-23b from the ground".ASTRONOMY & ASTROPHYSICS 553(2013):23PP.
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