[en] The relative rarity of giant planets around low-mass stars compared with solar-type stars is a key prediction from the core-accretion planet formation theory. In this paper we report on the discovery of four gas giant planets that transit low-mass late K and early M dwarfs. The planets HATS-74Ab (TOI 737b), HATS-75b (TOI 552b), HATS-76b (TOI 555b), and HATS-77b (TOI 730b) were all discovered from the HATSouth photometric survey and follow-up using TESS and other photometric facilities. We use the new ESPRESSO facility at the VLT to confirm systems and measure their masses. We find that these planets have masses of 1.46 ± 0.14 MJ, 0.491 ± 0.039 MJ, 2.629 ± 0.089 MJ, and ?{1.374}_{-0.074}^{+0.100}\,$ MJ, respectively, and radii of 1.032 ± 0.021 RJ, 0.884 ± 0.013 RJ, 1.079 ± 0.031 RJ, and 1.165 ± 0.021 RJ, respectively. The planets all orbit close to their host stars with orbital periods ranging from 1.7319 days to 3.0876 days. With further work, we aim to test core-accretion theory by using these and further discoveries to quantify the occurrence rate of giant planets around low-mass host stars. *The HATSouth network is operated by a collaboration consisting of Princeton University (PU), the Max Planck Institute für Astronomie (MPIA), the Australian National University (ANU), and the Universidad Adolfo Ibáñez (UAI). The station at Las Campanas Observatory (LCO) of the Carnegie Institute is operated by PU in conjunction with UAI, the station at the High Energy Spectroscopic Survey (H.E.S.S.) site is operated in conjunction with MPIA, and the station at Siding Spring Observatory (SSO) is operated jointly with ANU. Based in part on observations made with the MPG 2.2 m Telescope at the ESO Observatory in La Silla. Based on observations collected at the European Southern Observatory.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Jordán, Andrés; Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile, Millennium Institute for Astrophysics, Chile
Hartman, J. D.; Department of Astrophysical Sciences, Princeton University, NJ 08544, USA
Bayliss, D.; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
Bakos, G. Á.; Department of Astrophysical Sciences, Princeton University, NJ 08544, USA
Brahm, R.; Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile, Millennium Institute for Astrophysics, Chile
Bryant, E. M.; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK, Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
Csubry, Z.; Department of Astrophysical Sciences, Princeton University, NJ 08544, USA
Henning, Th.; Max Planck Institute for Astronomy, Königstuhl 17, D-69117-Heidelberg, Germany
Hobson, M.; Millennium Institute for Astrophysics, Chile, Max Planck Institute for Astronomy, Königstuhl 17, D-69117-Heidelberg, Germany
Mancini, L.; Max Planck Institute for Astronomy, Königstuhl 17, D-69117-Heidelberg, Germany, Department of Physics, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, I-00133-Roma, Italy, INAF-Astrophysical Observatory of Turin, Via Osservatorio 20, I-10025-Pino Torinese, Italy
Penev, K.; Department of Physics, University of Texas at Dallas, Richardson, TX 75080, USA
Rabus, M.; Departamento de Matemática y Física Aplicadas, Facultad de Ingeniería, Universidad Católica de la Santísima Concepción, Alonso de Rivera 2850, Concepción, Chile
Suc, V.; Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile, Millennium Institute for Astrophysics, Chile
de Val-Borro, M.; Astrochemistry Laboratory, Goddard Space Flight Center, NASA, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
Wallace, J.; Department of Astrophysical Sciences, Princeton University, NJ 08544, USA
Ciardi, David R.; NASA Exoplanet Science Institute-Caltech/IPAC, Pasadena, CA 91125 USA
Collins, K. A.; Center for Astrophysics ∣ Harvard &, Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
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Furlan, E.; NASA Exoplanet Science Institute, Caltech/IPAC, Mail Code 100-22, 1200 E. California Boulevard, Pasadena, CA 91125, USA
Gan, T.; Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, People's Republic of China
Benkhaldoun, Z.; Astrobiology Research Unit, Université de Liège, 19C Allée du 6 Août, B-4000 Liège, Belgium, Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University, Marrakech, Morocco
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Fukui, A.; Komaba Institute for Science, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan, Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Tenerife, Spain
Kawauchi, K.; Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Tenerife, Spain
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Narita, Norio; Komaba Institute for Science, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan, Astrobiology Center, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan, Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Tenerife, Spain
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