A multi-site campaign to detect the transit of the second planet in HAT-P-13 (research note)

Gy M. Szabó, L. L. Kiss, J. M. Benko, Gy Mezo, J. Nuspl, Zs Regály, K. Sárneczky, A. E. Simon, G. Leto, R. Zanmar Sanchez, C. C. Ngeow, Zs Kovári, R. Szabó

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16 Scopus citations


Aims: A possible transit of HAT-P-13c had been predicted to occur on 2010 April 28. Here we report on the results of our multi-site campaign organised to detect the event. Methods: CCD photometric observations were carried out at five observatories in five countries. We reached 30% time coverage in a 5-day interval centered on the suspected transit of HAT-P-13c. Two transits of HAT-P-13b were also observed. Results: No transit of HAT-P-13c was detected during the campaign. By a numerical experiment with 105 model systems, we conclude that HAT-P-13c is not a transiting exoplanet with a significance level from 65% to 72%, depending on the planet parameters and the prior assumptions. We present two times of transit of HAT-P-13b ocurring at BJD 2 455 141.5522 ± 0.0010 and BJD 2 455 249.4508 ± 0.0020. The TTV of HAT-P-13b is consistent with zero within 0.001 days. The refined orbital period of HAT-P-13b is 2.916293 ± 0.000010 days.

Original languageEnglish
Article numberA84
JournalAstronomy and Astrophysics
Issue number5
StatePublished - 18 Nov 2010


  • planetary systems
  • stars: individual: HAT-P-13


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