SIMBAD references

2019ApJ...883..205B - Astrophys. J., 883, 205-205 (2019/October-1)

The ultracool SpeXtroscopic survey. I. Volume-limited spectroscopic sample and luminosity function of M7-L5 ultracool dwarfs.

BARDALEZ GAGLIUFFI D.C., BURGASSER A.J., SCHMIDT S.J., THEISSEN C., GAGNE J., GILLON M., SAHLMANN J., FAHERTY J.K., GELINO C., CRUZ K.L., SKRZYPEK N. and LOOPER D.

Abstract (from CDS):

We present a volume-limited, spectroscopically verified sample of M7-L5 ultracool dwarfs (UCDs) within 25 pc. The sample contains 410 sources, of which 93% have trigonometric distance measurements (80% from Gaia DR2) and 81% have low-resolution (R ∼ 120), near-infrared (NIR) spectroscopy. We also present an additional list of 60 sources that may be M7-L5 dwarfs within 25 pc when distance or spectral-type uncertainties are taken into account. The spectra provide NIR spectral and gravity classifications, and we use these to identify young sources, red and blue J - KS color outliers, and spectral binaries. We measure very low gravity and intermediate-gravity fractions of 2.1_-0.8 %_^+0.9 % ^ and 7.8_-1.5 %_^+1.7 % ^, respectively; fractions of red and blue color outliers of 1.4_-0.5 %_^+0.6 % ^ and 3.6_-0.9 %_^+1.0 % ^, respectively; and a spectral binary fraction of 1.6_-0.5 %_^+0.5 % ^. We present an updated luminosity function for M7-L5 dwarfs continuous across the hydrogen-burning limit that agrees with previous studies. We estimate our completeness to range between 69% and 80% when compared to an isotropic model. However, we find that the literature late-M sample is severely incomplete compared to L dwarfs, with completeness of 62_-7 %_^+8 % ^ and 83_-9 %_^+10 % ^, respectively. This incompleteness can be addressed with astrometric-based searches of UCDs with Gaia to identify objects previously missed by color- and magnitude-limited surveys.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): astronomical databases: miscellaneous - binaries: close - binaries: general - brown dwarfs - infrared: stars - stars: fundamental parameters

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 188

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2022.08.09-00:14:34

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