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

Content Provider	EDP Sciences
Author	G. Maciejewski D. Dimitrov M. Seeliger St. Raetz Ł. Bukowiecki M. Kitze R. Errmann G. Nowak A. Niedzielski V. Popov C. Marka K. Goździewski R. Neuhäuser J. Ohlert T. C. Hinse J. W. Lee C.-U. Lee J.-N. Yoon A. Berndt H. Gilbert Ch. Ginski M. M. Hohle M. Mugrauer T. Röll T. O. B. Schmidt N. Tetzlaff L. Mancini J. Southworth M. Dall’Ora S. Ciceri R. Zambelli G. Corfini H. Takahashi K. Tachihara J. M. Benkő K. Sárneczky Gy. M. Szabo T. N. Varga M. Vaňko Y. C. Joshi W. P. Chen
Abstract	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 M_{Jup_{body on a 3.6-d eccentric orbit. A dynamical analysis indicates that the proposed two-planet system is stable on long timescales.}}
Page Count	16
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2013/03/aa20739-12/aa20739-12.html
e-ISSN	14320746
Journal	Astronomy & Astrophysics
Volume Number	551
DOI	10.1051/0004-6361/201220739
Language	English
Publisher	EDP Sciences
Publisher Date	2013-03-01
Access Restriction	Open
Rights Holder	© ESO, 2013
Subject Keyword	planets and satellites: general stars: individual: WASP-12 planets and satellites: individual: WASP-12 b planets and satellites: general / stars: individual: WASP-12 / planets and satellites: individual: WASP-12 b
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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