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Dynamical masses for two M1 + mid-M dwarf binaries monitored during the SPHERE-SHINE survey | | Beth A. Biller
; Antoine Grandjean
; Sergio Messina
; Silvano Desidera
; Philippe Delorme
; Anne-Marie Lagrange
; Franz-Josef Hambsch
; Dino Mesa
; Markus Janson
; Raffaele Gratton
; 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
; | | Date: |
10 Dec 2021 | | 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. | | Source: | arXiv, 2112.05457 | | Services: | Forum | Review | PDF | Favorites | |
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