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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693595.0, MPI für Astronomie / Publikationen_mpia
Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin
Authors:Maciejewski, G.; Dimitrov, D.; Seeliger, M.; Raetz, S.; 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, C.; 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, G. M.; Varga, T. N.; Vaňko, M.; Joshi, Y. C.; Chen, W. P.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Astronomy and Astrophysics
Start Page:id.A108 (16 pp)
Audience:Not Specified
Abstract / Description:<BR /> 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. <BR /> 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. <BR /> 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. Partly based on (1) data collected with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, (2) observations made at the Centro Astronómico Hispano Alemán (CAHA), operated jointly by the Max-Planck Institut für Astronomie and the Instituto de Astrofísica de Andalucía (CSIC), (3) data collected with telescopes at the Rozhen National Astronomical Observatory, and (4) observations obtained with telescopes of the University Observatory Jena, which is operated by the Astrophysical Institute of the Friedrich-Schiller-University.Tables 2 and 3 are available in electronic form at <A href="http://www.aanda.org">http://www.aanda.org</A>Light curves are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">cdsarc.u-strasbg.fr</A> (<A href=""></A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/551/A108">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/551/A108</A>
Free Keywords:planets and satellites: general; stars: individual: WASP-12; planets and satellites: individual: WASP-12 b
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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