Populating the brown dwarf and stellar boundary: Five stars with transiting companions near the hydrogen-burning mass limit
Article
Article Title | Populating the brown dwarf and stellar boundary: Five stars with transiting companions near the hydrogen-burning mass limit |
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ERA Journal ID | 1050 |
Article Category | Article |
Authors | Grieves, Nolan (Author), Bouchy, Francois (Author), Lendl, Monika (Author), Carmichael, Theron (Author), Mireles, Ismael (Author), Shporer, Avi (Author), McLeod, Kim K. (Author), Collins, Karen A. (Author), Brahm, Rafael (Author), Stassun, Keivan G. (Author), Gill, Sam (Author), Bouma, Luke G. (Author), Guillot, Tristan (Author), Cointepas, Marion (Author), Dos Santos, Leonardo A. (Author), Casewell, Sarah L. (Author), Jenkins, Jon M. (Author), Henning, Thomas (Author), Nielsen, Louise D. (Author), Psaridi, Angelica (Author), Udry, Stephane (Author), Segransan, Damien (Author), Eastman, Jason D. (Author), Zhou, George (Author), Abe, Lyu (Author), Agabi, Abelkrim (Author), Bakos, Gaspar (Author), Charbonneau, David (Author), Collins, Kevin I. (Author), Colon, Knicole D. (Author), Crouzet, Nicolas (Author), Dransfield, Georgina (Author), Evans, Phil (Author), Goeke, Robert F. (Author), Hart, Rhodes (Author), Irwin, Jonathan M. (Author), Jensen, Eric L. N. (Author), Jordan, Andres (Author), Kielkopf, John F. (Author), Latham, David W. (Author), Marie-Sainte, Wenceslas (Author), Mekarnia, Djamel (Author), Nelson, Peter (Author), Quinn, Samuel N. (Author), Radford, Don J. (Author), Rodriguez, David R. (Author), Rowden, Pamela (Author), Schmider, Francois-Xavier (Author), Schwarz, Richard P. (Author), Smith, Jeffrey C. (Author), Stockdale, Chris (Author), Suarez, Olga (Author), Tan, Thiam-Guan (Author), Triaud, Amaury H. M. J. (Author), Waalkes, William (Author) and Wingham, Geof (Author) |
Journal Title | Astronomy and Astrophysics: a European journal |
Journal Citation | 652, pp. 1-25 |
Article Number | A127 |
Number of Pages | 25 |
Year | 2021 |
Publisher | EDP Sciences |
Place of Publication | France |
ISSN | 0004-6361 |
1432-0746 | |
Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/202141145 |
Web Address (URL) | https://www.aanda.org/articles/aa/abs/2021/08/aa41145-21/aa41145-21.html |
Abstract | We report the discovery of five transiting companions near the hydrogen-burning mass limit in close orbits around main sequence stars originally identified by the Transiting Exoplanet Survey Satellite (TESS) as TESS objects of interest (TOIs): TOI-148, TOI-587, TOI-681, TOI-746, and TOI-1213. Using TESS and ground-based photometry as well as radial velocities from the CORALIE, CHIRON, TRES, and FEROS spectrographs, we found the companions have orbital periods between 4.8 and 27.2 days, masses between 77 and 98 MJup, and radii between 0.81 and 1.66 RJup. These targets have masses near the uncertain lower limit of hydrogen core fusion (~73-96 MJup), which separates brown dwarfs and low-mass stars. We constrained young ages for TOI-587 (0.2 ± 0.1 Gyr) and TOI-681 (0.17 ± 0.03 Gyr) and found them to have relatively larger radii compared to other transiting companions of a similar mass. Conversely we estimated older ages for TOI-148 and TOI-746 and found them to have relatively smaller companion radii. With an effective temperature of 9800 ± 200 K, TOI-587 is the hottest known main-sequence star to host a transiting brown dwarf or very low-mass star. We found evidence of spin-orbit synchronization for TOI-148 and TOI-746 as well as tidal circularization for TOI-148. These companions add to the population of brown dwarfs and very low-mass stars with well measured parameters ideal to test formation models of these rare objects, the origin of the brown dwarf desert, and the distinction between brown dwarfs and hydrogen-burning main sequence stars. |
Keywords | Binaries: Eclipsing; Brown dwarfs; Stars: Low-mass; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Geneva, Switzerland |
Harvard University, United States | |
University of New Mexico, United States | |
Massachusetts Institute of Technology, United States | |
Wellesley College, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Adolfo Ibanez University, Chile | |
Vanderbilt University, United States | |
University of Warwick, United Kingdom | |
Princeton University, United States | |
Cote d'Azur University, France | |
University of Leicester, United Kingdom | |
National Aeronautics and Space Administration (NASA), United States | |
Max Planck Society, Germany | |
George Mason University, United States | |
NASA Goddard Space Flight Center, United States | |
European Space Agency, France | |
University of Birmingham, United Kingdom | |
El Sauce Observatory, Chile | |
Centre for Astrophysics | |
Swarthmore College, United States | |
University of Louisville, United States | |
Concordia Station, Antarctica | |
Ellinbank Observatory, Australia | |
Brierfield Observatory, Australia | |
Space Telescope Science Institute, United States | |
Royal Astronomical Society, United Kingdom | |
Patashnick Voorheesville Observatory, United States | |
NASA Ames Research Center, United States | |
Hazelwood Observatory, Australia | |
Perth Exoplanet Survey Telescope Observatory, Australia | |
University of Colorado Boulder, United States | |
Mt. Stuart Observatory, New Zealand | |
Funding source | Australian Research Council (ARC) Grant ID DE210101893 |
https://research.usq.edu.au/item/q6x3x/populating-the-brown-dwarf-and-stellar-boundary-five-stars-with-transiting-companions-near-the-hydrogen-burning-mass-limit
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