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http://hdl.handle.net/20.500.12386/35687
Title: | Dynamical masses for two M1 + mid-M dwarf binaries monitored during the SPHERE-SHINE survey | Authors: | Beth A. Biller Antoine Grandjean MESSINA, Sergio DESIDERA, Silvano Philippe Delorme Anne-Marie Lagrange Franz-Josef Hambsch MESA, Dino Markus Janson GRATTON, Raffaele Valentina D'Orazi Maud Langlois Anne-Lise Maire Joshua Schlieder Thomas Henning Alice Zurlo Janis Hagelberg S. Brown C. Romero Mickaël Bonnefoy Gael Chauvin Markus Feldt Michael Meyer Arthur Vigan A. Pavlov C. Soenke D. LeMignant A. Roux |
Issue Date: | 2022 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 658 | First Page: | A145 | Abstract: | We present orbital fits and dynamical masses for HIP 113201AB and HIP 36985AB, two M1 + mid-M dwarf binary systems monitored as part of the SPHERE SHINE survey. To robustly determine ages via gyrochronology, we undertook a photometric monitoring campaign for HIP 113201 and for GJ 282AB, the two wide K star companions to HIP 36985, using the 40 cm Remote Observatory Atacama Desert (ROAD) telescope. We adopt ages of 1.2$\pm$0.1 Gyr for HIP 113201AB and 750$\pm$100 Myr for HIP 36985AB. To derive dynamical masses for all components of these systems, we used parallel-tempering Markov Chain Monte Carlo sampling to fit a combination of radial velocity, direct imaging, and Gaia and Hipparcos astrometry. Fitting the direct imaging and radial velocity data for HIP 113201 yields a primary mass of 0.54$\pm$0.03 M$_{\odot}$, fully consistent with its M1 spectral type, and a secondary mass of 0.145$\pm$ M$_{\odot}$. The secondary masses derived with and without including Hipparcos/Gaia data are more massive than the 0.1 M$_{\odot}$ estimated mass from the photometry of the companion. An undetected brown dwarf companion to HIP 113201B could be a natural explanation for this apparent discrepancy. At an age $>$1 Gyr, a 30 M$_{Jup}$ companion to HIP 113201B would make a negligible ($<$1$\%$) contribution to the system luminosity, but could have strong dynamical impacts. Fitting the direct imaging, radial velocity, and Hipparcos/Gaia proper motion anomaly for HIP 36985AB, we find a primary mass of 0.54$\pm$0.01 M$_{\odot}$ and a secondary mass of 0.185$\pm$0.001 M$_{\odot}$ which agree well with photometric estimates of component masses, the masses estimated from $M_{K}$-- mass relationships for M dwarf stars, and previous dynamical masses in the literature. | URI: | http://hdl.handle.net/20.500.12386/35687 | URL: | http://arxiv.org/abs/2112.05457v1 https://www.aanda.org/articles/aa/full_html/2022/02/aa42438-21/aa42438-21.html |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/202142438 | Bibcode ADS: | 2022A&A...658A.145B | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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aa42438-21 compr.pdf | Pdf editoriale | 2.4 MB | Adobe PDF | View/Open |
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