Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4

R. V. Baluev, E. N. Sokov, H. R. A. Jones, V. Sh. Shaidulin, I. A. Sokova, L. D. Nielsen, P. Benni, E. M. Schneiter, C. Villarreal D'Angelo, E. Fernandez-Lajus, R. P. Di Sisto, O. Basturk, M. Bretton, A. Wunsche, V-P Hentunen, S. Shadick, Y. Jongen, W. Kang, T. Kim, E. PakstieneJ. K. T. Qvam, C. R. Knight, P. Guerra, A. Marchini, F. Salvaggio, R. Papini, P. Evans, M. Salisbury, F. Garcia, D. Molina, J. Garlitz, N. Esseiva, Y. Ogmen, Yu Karavaev, S. Rusov, M. A. Ibrahimov, R. G. Karimov

Результат исследований: Научные публикации в периодических изданияхстатья

8 Цитирования (Scopus)


We homogeneously analyse similar to 3.2 x 10(5) photometric measurements for similar to 1100 transit light curves belonging to 17 exoplanet hosts. The photometric data cover 16 years (2004-2019) and include amateur and professional observations. Old archival light curves were reprocessed using up-to-date exoplanetary parameters and empirically debiased limb-darkening models. We also derive self-consistent transit and radial-velocity fits for 13 targets. We confirm the non-linear transit timing variation (TTV) trend in the WASP-12 data at a high significance, and with a consistent magnitude. However, Doppler data reveal hints of a radial acceleration of about -7.5 +/- 2.2 ms(-1) yr(-1), indicating the presence of unseen distant companions, and suggesting that roughly 10 per cent of the observed TTV was induced via the light-travel (or Roemer) effect. For WASP-4, a similar TTV trend suspected after the recent TESS observations appears controversial and model dependent. It is not supported by our homogeneous TTV sample, including 10 ground-based EXPANSION light curves obtained in 2018 simultaneously with TESS. Even if the TTV trend itself does exist in WASP-4, its magnitude and tidal nature are uncertain. Doppler data cannot entirely rule out the Roemer effect induced by possible distant companions.

Язык оригиналаАнглийский
Страницы (с-по)1294-1312
ЖурналMonthly Notices of the Royal Astronomical Society
Номер выпуска1
Ранняя дата в режиме онлайн19 сен 2019
СостояниеОпубликовано - ноя 2019


Baluev, R. V., Sokov, E. N., Jones, H. R. A., Shaidulin, V. S., Sokova, I. A., Nielsen, L. D., Benni, P., Schneiter, E. M., D'Angelo, C. V., Fernandez-Lajus, E., Di Sisto, R. P., Basturk, O., Bretton, M., Wunsche, A., Hentunen, V-P., Shadick, S., Jongen, Y., Kang, W., Kim, T., ... Karimov, R. G. (2019). Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4. Monthly Notices of the Royal Astronomical Society, 490(1), 1294-1312. https://doi.org/10.1093/mnras/stz2620