A hot Jupiter around the very active weak-line T Tauri star TAP 26

MaTYSSE Collaboration, L. Yu, J.-F. Donati, E. M. Hébrard, C. Moutou, L. Malo, K. Grankin, G. Hussain, A. Collier Cameron, A. A. Vidotto, C. Baruteau, S. H. P. Alencar, J. Bouvier, P. Petit, M. Takami, G. J. Herczeg, S. G. Gregory, M. Jardine, J. Morin, F. Ménard

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Abstract

We report the results of an extended spectropolarimetric and photometric monitoring of the weak-line T Tauri star TAP 26, carried out within the Magnetic Topologies of Young Stars and the Survival of close-in massive Exoplanets (MaTYSSE) programme with the Echelle SpectroPolarimetric Device for the Observation of Stars (ESPaDOnS) spectropolarimeter at the 3.6-m Canada-France-Hawaii Telescope. Applying Zeeman-Doppler Imaging (ZDI) to our observations, concentrating in 2015 November and 2016 January and spanning 72 d in total, 16 d in 2015 November and 13 d in 2016 January, we reconstruct surface brightness and magnetic field maps for both epochs and demonstrate that both distributions exhibit temporal evolution not explained by differential rotation alone. We report the detection of a hot Jupiter (hJ) around TAP 26 using three different methods, two using ZDI and one Gaussian-process regression (GPR), with a false-alarm probability smaller than 6 × 10-4. However, as a result of the aliasing related to the observing window, the orbital period cannot be uniquely determined; the orbital period with highest likelihood is 10.79 ± 0.14 d followed by 8.99 ± 0.09 d. Assuming the most likely period, and that the planet orbits in the stellar equatorial plane, we obtain that the planet has a minimum mass Msin I of 1.66 ± 0.31 MJup and orbits at 0.0968 ± 0.0032 au from its host star. This new detection suggests that disc type II migration is efficient at generating newborn hJs, and that hJs may be more frequent around young T Tauri stars than around mature stars (or that the MaTYSSE sample is biased towards hJ-hosting stars)....
Original languageEnglish
Pages (from-to)1342-1359
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume467
Issue number2
Early online date7 Jan 2017
DOIs
Publication statusPublished - May 2017

Keywords

  • magnetic fields
  • techniques: polarimetric
  • planets and satellites: formation
  • stars: imaging
  • stars: individual: TAP 26
  • stars: rotation

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    MaTYSSE Collaboration, Yu, L., Donati, J-F., Hébrard, E. M., Moutou, C., Malo, L., Grankin, K., Hussain, G., Collier Cameron, A., Vidotto, A. A., Baruteau, C., Alencar, S. H. P., Bouvier, J., Petit, P., Takami, M., Herczeg, G. J., Gregory, S. G., Jardine, M., Morin, J., & Ménard, F. (2017). A hot Jupiter around the very active weak-line T Tauri star TAP 26. Monthly Notices of the Royal Astronomical Society, 467(2), 1342-1359. https://doi.org/10.1093/mnras/stx009