Updated orbital monitoring and dynamical masses for nearby M-dwarf binaries

DOI
Publisher DOI
Abstract
Young M-type binaries are particularly useful for precise isochronal dating by taking advantage of their extended pre-main sequence evolution. Orbital monitoring of these low-mass objects becomes essential in constraining their fundamental properties, as dynamical masses can be extracted from their Keplerian motion. Here, we present the combined efforts of the AstraLux Large Multiplicity Survey, together with a filler sub-programme from the SpHere INfrared Exoplanet (SHINE) project and previously unpublished data from the FastCam lucky imaging camera at the Nordical Optical Telescope (NOT) and the NaCo instrument at the Very Large Telescope (VLT). Building on previous work, we use archival and new astrometric data to constrain orbital parameters for 20 M-type binaries. We identify that eight of the binaries have strong Bayesian probabilities and belong to known young moving groups (YMGs). We provide a first attempt at constraining orbital parameters for 14 of the binaries in our sample, with the remaining six having previously fitted orbits for which we provide additional astrometric data and updated Gaia parallaxes. The substantial orbital information built up here for four of the binaries allows for direct comparison between individual dynamical masses and theoretical masses from stellar evolutionary model isochrones, with an additional three binary systems with tentative individual dynamical mass estimates likely to be improved in the near future. We attained an overall agreement between the dynamical masses and the theoretical masses from the isochrones based on the assumed YMG age of the respective binary pair. The two systems with the best orbital constrains for which we obtained individual dynamical masses, J0728 and J2317, display higher dynamical masses than predicted by evolutionary models.
Date Issued
2022
Publication Type
Article
Subject(s)
Language(s)
en
Author(s)
Calissendorff, Per
Janson, Markus
Rodet, Laetitia
Köhler, Rainer
Bonnefoy, Mickaël
Brandner, Wolfgang
Brown-Sevilla, Samantha
Chauvin, Gaël
Delorme, Philippe
Desidera, Silvano
Durkan, Stephen
Gratton, Raffaele
Hagelberg, Janis
Henning, Thomas
Hippler, Stefan
Lagrange, Anne-Marie
Langlois, Maud
Lazzoni, Cecilia
Maire, Anne-Lise
Messina, Sergio
Meyer, Michael
Möller-Nilsson, Ole
Rabus, Markus
Schlieder, Joshua
Vigan, Arthur
Wahhaj, Zahed
Wildi, Francois
Zurlo, Alice
Additional Credits
Journal
Astronomy and astrophysics
Publisher
EDP Sciences
ISSN
0004-6361
Access(Rights)
open.access
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