TOI-811b and TOI-852b: New Transiting Brown Dwarfs with Similar Masses and Very Different Radii and Ages from the TESS Mission
Article
Article Title | TOI-811b and TOI-852b: New Transiting Brown Dwarfs with Similar Masses and Very Different Radii and Ages from the TESS Mission |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Carmichael, Theron W. (Author), Quinn, Samuel N. (Author), Zhou, George (Author), Grieves, Nolan (Author), Irwin, Jonathan M. (Author), Stassun, Keivan G. (Author), Vanderburg, Andrew M. (Author), Winn, Joshua N. (Author), Bouchy, Francois (Author), Brasseur, Clara E. (Author), Briceno, Cesar (Author), Caldwell, Douglas A. (Author), Charbonneau, David (Author), Collins, Karen A. (Author), Colon, Knicole D. (Author), Eastman, Jason D. (Author), Fausnaugh, Michael (Author), Fong, William (Author), Furesz, Gabor (Author), Huang, Chelsea (Author), Jenkins, Jon M. (Author), Kielkopf, John F. (Author), Latham, David W. (Author), Law, Nicholas (Author), Lund, Michael B. (Author), Mann, Andrew W. (Author), Ricker, George R. (Author), Rodriguez, Joseph E. (Author), Schwarz, Richard P. (Author), Shporer, Avi (Author), Tenenbaum, Peter (Author), Wood, Mackenna L. (Author) and Ziegler, Carl (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 161 (2), pp. 1-17 |
Article Number | 97 |
Number of Pages | 17 |
Year | 2021 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/abd4e1 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/abd4e1 |
Abstract | We report the discovery of two transiting brown dwarfs (BDs), TOI-811b and TOI-852b, from NASA's Transiting Exoplanet Survey Satellite mission. These two transiting BDs have similar masses but very different radii and ages. Their host stars have similar masses, effective temperatures, and metallicities. The younger and larger transiting BD is TOI-811b at a mass of Mb = 59.9 ± 13.0MJ and radius of Rb = 1.26 ± 0.06RJ, and it orbits its host star in a period of P = 25.16551 ± 0.00004 days. We derive the host star's age of 93+61-29 Myr from an application of gyrochronology. The youth of this system, rather than external heating from its host star, is why this BD's radius is relatively large. This constraint on the youth of TOI-811b allows us to test substellar mass-radius evolutionary models at young ages where the radius of BDs changes rapidly. TOI-852b has a similar mass at Mb = 53.7 ± 1.4MJ but is much older (4 or 8 Gyr, based on bimodal isochrone results of the host star) and is also smaller with a radius of Rb = 0.83 ± 0.04RJ. TOI-852b's orbital period is P = 4.94561 ± 0.00008 days. TOI-852b joins the likes of other old transiting BDs that trace out the oldest substellar mass-radius evolutionary models where contraction of the BD's radius slows and approaches a constant value. Both host stars have a mass of M∗ = 1.32M⊙ ± 0.05 and differ in their radii, Teff, and [Fe/H], with TOI-811 having R∗ = 1.27 ± 0.09R⊙, Teff = 6107 ± 77 K, and [Fe/ H]=+0.40 ± 0.09 and TOI-852 having R∗ = 1.71 ± 0.04R⊙, Teff = 5768 ± 84 K, and [Fe/H]=+0.33 ± 0.09. We take this opportunity to examine how TOI-811b and TOI-852b serve as test points for young and old substellar isochrones, respectively. |
Keywords | Brown dwarfs; Radial velocity; Transit photometry; Spectroscopy; Photometry; Substellar companion stars; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Harvard University, United States |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of Geneva, Switzerland | |
Harvard-Smithsonian Centre for Astrophysics, United States | |
Vanderbilt University, United States | |
University of Wisconsin-Madison, United States | |
Princeton University, United States | |
Space Telescope Science Institute, United States | |
Cerro Tololo Inter-American Observatory, Chile | |
NASA Ames Research Center, United States | |
NASA Goddard Space Flight Center, United States | |
Massachusetts Institute of Technology, United States | |
School of Mathematics, Physics and Computing | |
University of North Carolina, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Patashnick Voorheesville Observatory, United States | |
University of Toronto, Canada |
https://research.usq.edu.au/item/q6x33/toi-811b-and-toi-852b-new-transiting-brown-dwarfs-with-similar-masses-and-very-different-radii-and-ages-from-the-tess-mission
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