Evidence for Spin-Orbit Alignment in the TRAPPIST-1 System

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  • Teruyuki Hirano, Tokyo Institute of Technology
  • ,
  • Eric Gaidos, University of Hawaii at Manoa
  • ,
  • Joshua N. Winn, Princeton University, Princeton, NJ
  • ,
  • Fei Dai, California Institute of Technology
  • ,
  • Akihiko Fukui, University of Tokyo, Instituto de Astrofísica de Canarias
  • ,
  • Masayuki Kuzuhara, National Institutes of Natural Sciences, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
  • ,
  • Takayuki Kotani, National Institutes of Natural Sciences, National Institutes of Natural Sciences - National Astronomical Observatory of Japan, Graduate University for Advanced Studies
  • ,
  • Motohide Tamura, National Institutes of Natural Sciences, National Institutes of Natural Sciences - National Astronomical Observatory of Japan, University of Tokyo
  • ,
  • Maria Hjorth
  • ,
  • Simon Albrecht
  • Daniel Huber, Institute for Astronomy, University of Hawaii at Manoa
  • ,
  • Emeline Bolmont, University of Geneva
  • ,
  • Hiroki Harakawa, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
  • ,
  • Klaus Hodapp, University of Hawaii at Hilo
  • ,
  • Masato Ishizuka, University of Tokyo
  • ,
  • Shane Jacobson, University of Hawaii at Hilo
  • ,
  • Mihoko Konishi, Oita University
  • ,
  • Tomoyuki Kudo, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
  • ,
  • Takashi Kurokawa, National Institutes of Natural Sciences - National Astronomical Observatory of Japan, Tokyo University of Agriculture and Technology
  • ,
  • Jun Nishikawa, National Institutes of Natural Sciences, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
  • ,
  • Masashi Omiya, National Institutes of Natural Sciences, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
  • ,
  • Takuma Serizawa, Tokyo University of Agriculture and Technology
  • ,
  • Akitoshi Ueda, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
  • ,
  • Lauren M. Weiss, University of Hawaii at Manoa

In an effort to measure the Rossiter-McLaughlin effect for the TRAPPIST-1 system, we performed high-resolution spectroscopy during transits of planets e, f, and b. The spectra were obtained with the InfraRed Doppler spectrograph on the Subaru 8.2 m telescope, and were supplemented with simultaneous photometry obtained with a 1 m telescope of the Las Cumbres Observatory Global Telescope. By analyzing the anomalous radial velocities, we found the projected stellar obliquity to be λ = 1 ± 28° under the assumption that the three planets have coplanar orbits, although we caution that the radial-velocity data show correlated noise of unknown origin. We also sought evidence for the expected deformations of the stellar absorption lines, and thereby detected the "Doppler shadow" of planet b with a false-alarm probability of 1.7%. The joint analysis of the observed residual cross-correlation map including the three transits gave λ = 19± 13 15. These results indicate that the the TRAPPIST-1 star is not strongly misaligned with the common orbital plane of the planets, although further observations are encouraged to verify this conclusion.

OriginalsprogEngelsk
ArtikelnummerL27
TidsskriftAstrophysical Journal Letters
Vol/bind890
Nummer2
Antal sider7
ISSN2041-8205
DOI
StatusUdgivet - 2020

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