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)

Аннотация

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
Том490
Номер выпуска1
Ранняя дата в режиме онлайн19 сен 2019
DOI
СостояниеОпубликовано - ноя 2019

Цитировать

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