HATS-71b: A Giant Planet Transiting an M3 Dwarf Star in TESS Sector 1

G. A. Bakos, D. Bayliss, J. Bento, W. Bhatti, R. Brahm, Z. Csubry, N. Espinoza, J. D. Hartman, Th Henning, A. Jordán, L. Mancini, K. Penev, M. Rabus, P. Sarkis, V. Suc, M. De Val-Borro, G. Zhou, R. P. Butler, J. Crane, S. DurkanS. Shectman, J. Kim, J. Lázár, I. Papp, P. Sári, G. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. N. Winn, J. Jenkins, A. D. Chacon, G. Fűrész, B. Goeke, J. Li, S. Quinn, E. V. Quintana, P. Tenenbaum, J. Teske, M. Vezie, L. Yu, C. Stockdale, P. Evans, H. M. Relles

Research output: Contribution to journalArticle


We report the discovery of HATS-71b, a transiting gas giant planet on a day orbit around a mag M3 dwarf star. HATS-71 is the coolest M dwarf star known to host a hot Jupiter. The loss of light during transits is 4.7%, more than in any other confirmed transiting planet system. The planet was identified as a candidate by the ground-based HATSouth transit survey. It was confirmed using ground-based photometry, spectroscopy, and imaging, as well as space-based photometry from the NASA Transiting Exoplanet Survey Satellite mission (TIC 234523599). Combining all of these data, and utilizing Gaia DR2, we find that the planet has a radius of 1.024&pm; 0.018 R J and mass of 0.37,&pm; 0.24 M J (95% confidence upper limit of < 0.80 M J), while the star has a mass of 0.4861 pm 0.0060 M⊙ and a radius of 0.4783&pm; 0.0060 R⊙.

Original languageEnglish (US)
Article number267
JournalAstronomical Journal
Issue number6
StatePublished - Jun 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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    Bakos, G. A., Bayliss, D., Bento, J., Bhatti, W., Brahm, R., Csubry, Z., Espinoza, N., Hartman, J. D., Henning, T., Jordán, A., Mancini, L., Penev, K., Rabus, M., Sarkis, P., Suc, V., De Val-Borro, M., Zhou, G., Butler, R. P., Crane, J., ... Relles, H. M. (2020). HATS-71b: A Giant Planet Transiting an M3 Dwarf Star in TESS Sector 1. Astronomical Journal, 159(6), [267]. https://doi.org/10.3847/1538-3881/ab8ad1