The mass–radius relationship for very low mass stars: four new discoveries from the HATSouth Survey
Article
Article Title | The mass–radius relationship for very low mass stars: four new discoveries from the HATSouth Survey |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Zhou, G. (Author), Bayliss, D. (Author), Hartman, J. D. (Author), Bakos, G. A. (Author), Penev, K. (Author), Csubry, Z. (Author), Tan, T. G. (Author), Jordan, A. (Author), Mancini, L. (Author), Rabus, M. (Author), Brahm, R. (Author), Espinoza, N. (Author), Mohler-Fischer, M. (Author), Ciceri, S. (Author), Suc, V. (Author), Csak, B. (Author), Henning, T. (Author) and Schmidt, B. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 437 (3), pp. 2831-2844 |
Number of Pages | 14 |
Year | 2013 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stt2100 |
Web Address (URL) | https://academic.oup.com/mnras/article/437/3/2831/1033737 |
Abstract | We report the discovery of four transiting F-M binary systems with companions between 0.1 and 0.2M⊙ in mass by the HATSouth survey. These systems have been characterized via a global analysis of the HATSouth discovery data, combined with high-resolution radial velocities and accurate transit photometry observations. We determined the masses and radii of the component stars using a combination of two methods: isochrone fitting of spectroscopic primary star parameters and equating spectroscopic primary star rotation velocity with spin-orbit synchronization. These new very low mass companions are HATS550- 016B (0.110+0.005 -0.006M⊙, 0.147+0.003 -0.004 R⊙), HATS551-019B (0.17+0.01 -0.01M⊙, 0.18+0.01 -0.01 R⊙), HATS551-021B (0.132+0.014 -0.005M⊙, 0.154+0.006 -0.008 R⊙) and HATS553-001B (0.20+0.01 -0.02M⊙, 0.22+0.01 -0.01 R⊙). We examine our sample in the context of the radius anomaly for fully convective low-mass stars. Combining our sample with the 13 other well-studied very low mass stars, we find a tentative 5 per cent systematic deviation between the measured radii and theoretical isochrone models. |
Keywords | binaries: eclipsing; stars: low-mass; Astrophysics - Solar; Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Australian National University |
Princeton University, United States | |
Perth Exoplanet Survey Telescope Observatory, Australia | |
Pontifical Catholic University of Chile, Chile | |
Max Planck Society, Germany |
https://research.usq.edu.au/item/q6x71/the-mass-radius-relationship-for-very-low-mass-stars-four-new-discoveries-from-the-hatsouth-survey
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