Journal
ASTRONOMY & ASTROPHYSICS
Volume 551, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201220739
Keywords
planets and satellites: general; stars: individual: WASP-12; planets and satellites: individual: WASP-12 b
Categories
Funding
- Polish Ministry of Science and Higher Education [IP2010 023070, IP2011 031971, N/N203/402739]
- European Community [RG226604]
- Bulgarian National Science Fund [DO 02-362, DDVU 02/40-2010]
- Institute of Astronomy
- NAO, Bulgarian Academy of Sciences
- German national science foundation Deutsche Forschungsgemeinschaft (DFG) [NE 515/33-1, 33-2, 34-1, 32-1, 30-1]
- DFG [NE 515/33-1, 33-2, 34-1, SPP 1385, SCHR 665/7-1, MU 2695/13-1, Sonderforschungsbereich SFB TR 7]
- PAN/BAN exchange
- joint research project Spectral and photometric studies of variable stars
- Abbe-School of Photonics
- HPC Infrastructure for Grand Challenges of Science and Engineering (POWIEW)
- European Regional Development Fund under the Innovative Economy Operational Programme
- Korea Research Council for Fundamental Science and Technology (KRCF)
- KASI [2012-1-410-02]
- Carl-Zeiss-Foundation
- STFC
- Ministry of Education, Culture, Sports, Science and Technology in Japan [23540277]
- Hungarian Academy of Sciences
- MAG Zrt [HUMAN MB08C 81013]
- Hungarian OTKA [K-83790, K-104607]
- Slovak Research and Development Agency [APVV-0158-11]
- project VEGA [2/0094/11]
- Thuringian government [B 515-07010]
- Science and Technology Facilities Council [ST/H005307/1, ST/G009465/1] Funding Source: researchfish
- STFC [ST/H005307/1, ST/G009465/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [23540277] Funding Source: KAKEN
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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.
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