Bibcode
Gálvez-Ortiz, M. C.; Solano, E.; Lodieu, N.; Aberasturi, M.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 466, Issue 3, p.2983-3006
Advertised on:
4
2017
Citations
15
Refereed citations
13
Description
The frequency of multiple systems and their properties are key
constraints of stellar formation and evolution. Formation mechanisms of
very low-mass (VLM) objects are still under considerable debate, and an
accurate assessment of their multiplicity and orbital properties is
essential for constraining current theoretical models. Taking advantage
of the virtual observatory capabilities, we looked for comoving low and
VLM binary (or multiple) systems using the Large Area Survey of the
UKIDSS LAS DR10, SDSS DR9 and the 2MASS Catalogues. Other catalogues
(WISE, GLIMPSE, SuperCosmos, etc.) were used to derive the physical
parameters of the systems. We report the identification of 36 low and
VLM (˜M0-L0 spectral types) candidates to binary/multiple system
(separations between 200 and 92 000 au), whose physical association is
confirmed through common proper motion, distance and low probability of
chance alignment. This new system list notably increases the previous
sampling in their mass-separation parameter space (˜100). We have
also found 50 low-mass objects that we can classify as ˜L0-T2
according to their photometric information. Only one of these objects
presents a common proper motion high-mass companion. Although we could
not constrain the age of the majority of the candidates, probably most
of them are still bound except four that may be under disruption
processes. We suggest that our sample could be divided in two
populations: one tightly bound wide VLM systems that are expected to
last more than 10 Gyr, and other formed by weak bound wide VLM systems
that will dissipate within a few Gyr.
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