The Gaia ultracool dwarf sample - II. Structure at the end of the main sequence

被引：42

作者：

Smart, R. L. ^{[1
,2
]}

Marocco, F. ^{[3
]}

Sarro, L. M. ^{[4
]}

Barrado, D. ^{[5
]}

Beamin, J. C. ^{[6
]}

Caballero, J. A. ^{[5
]}

Jones, H. R. A. ^{[2
]}

机构：

[1] Ist Nazl Astrofis, Osservatorio Astrofis Torino, Str Osservatorio 20, I-10025 Pino Torinese, Italy

[2] Univ Hertfordshire, Sch Phys Astron & Math, Coll Lane, Hatfield AL10 9AB, Herts, England

[3] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[4] UNED, ETSI Informat, Dept Inteligencia Artificial, Juan del Rosal E-16, Madrid 28040, Spain

[5] CSIC, INTA, Ctr Astrobiol, ESAC Campus,Camino Bajo Castillo S-N, E-28692 Madrid, Spain

[6] Univ Autonoma Chile, Ctr Comunicac Ciencias, Santiago, Chile

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 485卷 / 03期

基金：

英国科学技术设施理事会;

关键词：

binaries: visual; brown dwarfs; Hertzsprung-Russell and colour-magnitude diagrams; stars: late-type; solar neighbourhood; BROWN DWARF; SKY SURVEY; T-DWARFS; TRIGONOMETRIC PARALLAXES; RESOLVED SPECTROSCOPY; BINARY-SYSTEMS; WIDE; STARS; DISCOVERY; COMPANION;

D O I：

10.1093/mnras/stz678

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We identify and investigate known late M, L, and T dwarfs in the Gaia second data release. This sample is being used as a training set in the Gaia data processing chain of the ultracool dwarfs work package. We find 695 objects in the optical spectral range M8-T6 with accurate Gaia coordinates, proper motions, and parallaxes which we combine with published spectral types and photometry from large area optical and infrared sky surveys. We find that 100 objects are in 47 multiple systems, of which 27 systems are published and 20 are new. These will be useful benchmark systems and we discuss the requirements to produce a complete catalogue of multiple systems with an ultracool dwarf component. We examine the magnitudes in the Gaia passbands and find that the G(BP) magnitudes are unreliable and should not be used for these objects. We examine progressively redder colour-magnitude diagrams and see a notable increase in the main-sequence scatter and a bivariate main sequence for old and young objects. We provide an absolute magnitude - spectral subtype calibration for G and G(RP) passbands along with linear fits over the range M8-L8 for other passbands.

引用

页码：4423 / 4440

页数：18

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