Multi-site campaign for transit timing variations of WASP-12 b: Possible detection of a long-period signal of planetary origin a long-period signal of planetary origin

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Title:	Multi-site campaign for transit timing variations of WASP-12 b: Possible detection of a long-period signal of planetary origin a long-period signal of planetary origin
Authors:	陳文屏;Maciejewski, G.;Dimitrov, D.;Seeliger, M.;Raetz, St;Bukowiecki, Ł.;Kitze, M.;Errmann, R.;Nowak, G.;Niedzielski, A.;Popov, V.;Marka, C.;Goździewski, K.;Neuhäuser, R.;Ohlert, J.;Hinse, T. C.;Lee, J. W.;Lee, C.-U.;Yoon, J.-N.;Berndt, A.;Gilbert, H.;Ginski, Ch;Hohle, M. M.;Mugrauer, M.;Röll, T.;Schmidt, T. O. B.;Tetzlaff, N.;Mancini, L.;Southworth, J.;Dall’Ora, M.;Ciceri, S.;Zambelli, R.;Corfini, G.;Takahashi, H.;Tachihara, K.;Benkő, J. M.;Sárneczky, K.;Szabo, Gy. M.;Varga, T. N.;Vaňko, M.;Joshi, Y. C.;Chen, W. P.
Contributors:	理學院天文研究所
Keywords:	Deviation;Dynamical systems;Dynamics;Eccentric orbits;Origins;Planets;planets and satellites: general;planets and satellites: individual: WASP-12 b;stars: individual: WASP-12;Time measurements;Transit
Date:	2013-03-11
Issue Date:	2026-04-21 14:19:18 (UTC+8)
Publisher:	EDP Sciences
Abstract:	摘要： Aims. The transiting planet WASP-12 b was identified as a potential target for transit-timing studies because a departure from a linear ephemeris has been reported in the literature. Such deviations could be caused by an additional planet in the system. We attempt to confirm the claimed variations in transit timing and interpret their origin. Methods. We organised a multi-site campaign to observe transits by WASP-12 b in three observing seasons, using 0.5–2.6-metre telescopes. Results. We obtained 61 transit light curves, many of them with sub-millimagnitude precision. The simultaneous analysis of the best-quality datasets allowed us to obtain refined system parameters, which agree with values reported in previous studies. The residuals versus a linear ephemeris reveal a possible periodic signal that may be approximated by a sinusoid with an amplitude of 0.00068 ± 0.00013 d and period of 500 ± 20 orbital periods of WASP-12 b. The joint analysis of timing data and published radial velocity measurements results in a two-planet model that explains observations better than do single-planet scenarios. We hypothesise that WASP-12 b might not be the only planet in the system, and there might be the additional 0.1 MJup body on a 3.6-d eccentric orbit. A dynamical analysis indicates that the proposed two-planet system is stable on long timescales. 出版者： EDP Sciences 出版日期： 2013-03 出處： Astronomy and astrophysics (Berlin), 2013-03, Vol.551, p.A108-17 資源來源： EDP Sciences 識別號： ISSN: 0004-6361 識別號： ISSN: 1432-0746 識別號： EISSN: 1432-0746 識別號： DOI: 10.1051/0004-6361/201220739
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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