Refined physical properties and g ', r ', i ', z ', J, H, K transmission spectrum of WASP-23b from the ground
文献类型：期刊论文
| 作者 | 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 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2013-05-01 |
| 卷号 | 553页码:23PP |
| ISSN号 | 0004-6361 |
| 关键词 | planetary systems planets and satellites: atmospheres planets and satellites: fundamental parameters planets and satellites: general stars: general |
| 通讯作者 | Nikolov, N (reprint author), Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany. Email: nikolay@astro.ex.ac.uk |
| 英文摘要 | Context. 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. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | TRANSIT LIGHT-CURVE ; HUBBLE-SPACE-TELESCOPE ; GIANT PLANET TRANSITS ; EXTRASOLAR PLANET ; ATMOSPHERIC HAZE ; HOT JUPITERS ; LOW-MASS ; SYSTEM ; PARAMETERS ; STELLAR |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000319858700026 |
| 公开日期 | 2014-01-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/9766]  |
| 专题 | 紫金山天文台_暗物质和空间天文实验室 |
| 作者单位 | 1.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 |
| 推荐引用方式 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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来源：紫金山天文台
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