TESS Asteroseismology of α Mensae: Benchmark Ages for a G7 Dwarf and Its M Dwarf Companion
Article
Article Title | TESS Asteroseismology of α Mensae: Benchmark Ages for a G7 Dwarf and Its M Dwarf Companion |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Chontos, Ashley (Author), Huber, Daniel (Author), Berger, Travis A. (Author), Kjeldsen, Hans (Author), Serenelli, Aldo M. (Author), Aguirre, Victor Silva (Author), Ball, Warrick H. (Author), Basu, Sarbani (Author), Bedding, Timothy R. (Author), Chaplin, William J. (Author), Claytor, Zachary R. (Author), Corsaro, Enrico (Author), Garcia, Rafael A. (Author), Howell, Steve B. (Author), Lundkvist, Mia S. (Author), Mathur, Savita (Author), Metcalfe, Travis S. (Author), Nielsen, Martin B. (Author), Ong, Jia Mian Joel (Author), Orhan, Zeynep Celik (Author), Ortel, Sibel (Author), Salama, Maissa (Author), Stassun, Keivan G. (Author), Townsend, R. H. D. (Author), van Saders, Jennifer L. (Author), Winther, Mark (Author), Yildiz, Mutlu (Author), Butler, R. Paul (Author), Tinney, C. G. (Author) and Wittenmyer, Robert A. (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 922 (2), pp. 1-15 |
Article Number | 229 |
Number of Pages | 15 |
Year | 2021 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/ac1269 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/ac1269 |
Abstract | Asteroseismology of bright stars has become increasingly important as a method to determine the fundamental properties (in particular ages) of stars. The Kepler Space Telescope initiated a revolution by detecting oscillations in more than 500 main-sequence and subgiant stars. However, most Kepler stars are faint and therefore have limited constraints from independent methods such as long-baseline interferometry. Here we present the discovery of solar-like oscillations in α Men A, a naked-eye (V = 5.1) G7 dwarf in TESS's southern continuous viewing zone. Using a combination of astrometry, spectroscopy, and asteroseismology, we precisely characterize the solar analog α Men A (T eff = 5569 62 K, R ∗ = 0.960 0.016 R o˙, M ∗ = 0.964 0.045 M o˙). To characterize the fully convective M dwarf companion, we derive empirical relations to estimate mass, radius, and temperature given the absolute Gaia magnitude and metallicity, yielding M ∗ = 0.169 0.006 M o˙, R ∗ = 0.19 0.01 R o˙, and T eff = 3054 44 K. Our asteroseismic age of 6.2 1.4 (stat) 0.6 (sys) Gyr for the primary places α Men B within a small population of M dwarfs with precisely measured ages. We combined multiple ground-based spectroscopy surveys to reveal an activity cycle of P = 13.1 1.1 yr for α Men A, a period similar to that observed in the Sun. We used different gyrochronology models with the asteroseismic age to estimate a rotation period of ∼30 days for the primary. Alpha Men A is now the closest (d = 10 pc) solar analog with a precise asteroseismic age from space-based photometry, making it a prime target for next-generation direct-imaging missions searching for true Earth analogs. |
Keywords | Asteroseismology (73); Stellar physics (1621); Stellar properties (1624); Stellar ages (1581); Solar oscillations (1515); Photometry (1234); Low mass stars (2050); Solar analogs (1941); Stellar activity (1580); Fundamental parameters of stars (555); M dwarf stars (982); Astrometry (80); Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | University of Hawaii, United States |
Aarhus University, Denmark | |
University of Barcelona, Spain | |
Yale University, United States | |
National Institute for Astrophysics, Italy | |
Sorbonne University, France | |
National Aeronautics and Space Administration (NASA), United States | |
Institute of Astrophysics of the Canary Islands, Spain | |
Space Science Institute, United States | |
Ege University, Turkiye | |
Vanderbilt University, United States | |
University of California, United States | |
Carnegie Institution of Washington, United States | |
University of New South Wales | |
Centre for Astrophysics | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q77vz/tess-asteroseismology-of-mensae-benchmark-ages-for-a-g7-dwarf-and-its-m-dwarf-companion
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