Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical masses of M-dwarf binaries in young moving groups: I - The
  case of TWA 22 and GJ 2060   Evolutionary models are widely used to infer the mass of stars, brown dwarfs,
and giant planets. Their predictions are thought to be less reliable at young
ages ($<$ 200 Myr) and in the low-mass regime ($\mathrm{<1~M_{\odot}}$). GJ
2060 AB and TWA 22 AB are two rare astrometric M-dwarf binaries respectively
members of the AB Doradus and Beta Pictoris moving groups. As their dynamical
mass can be measured within a few years, they can be used to calibrate the
evolutionary tracks and set new constraints on the age of young moving groups.
We find a total mass of $\mathrm{0.18\pm 0.02~M_\odot}$ for TWA 22. That mass
is in good agreement with model predictions at the age of the Beta Pic moving
group. We obtain a total mass of $\mathrm{1.09 \pm 0.10~M_{\odot}}$ for GJ
2060. We estimate a spectral type of M$1\pm0.5$,
$\mathrm{L/L_{\odot}=-1.20\pm0.05}$ dex, and $\mathrm{T_{eff}=3700\pm100}$ K
for GJ 2060 A. The B component is a M$3\pm0.5$ dwarf with
$\mathrm{L/L_{\odot}=-1.63\pm0.05}$ dex and $\mathrm{T_{eff}=3400\pm100}$ K.
The dynamical mass of GJ 2060 AB is inconsistent with the most recent models
predictions (BCAH15, PARSEC) for an ABDor age in the range 50-150 Myr. It is 10
to 20\% (1-2 sigma, depending on the assumed age) above the models predictions,
corresponding to an underestimation of $0.10$ to $0.20~\mathrm{M_\odot}$.
Coevality suggests a young age for the system ($\sim$ 50 Myr) according to most
evolutionary models. TWA 22 validates the predictions of recent evolutionary
tracks at $\sim$20 Myr. On the other hand, we evidence a 1-2 sigma mismatch
between the predicted and observed mass of GJ 2060 AB. This slight departure
may indicate that one of the star hosts a tight companion. Alternatively, this
would confirm the models tendency to underestimate the mass of young low-mass
stars.

21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an