Article (Scientific journals)
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. et al.
2019In Astrophysical Journal, 883 (2)
Peer Reviewed verified by ORBi
 

Files


Full Text
1906.04166.pdf
Author preprint (67.35 MB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Abstract :
[en] 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-K S 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- A nd magnitude-limited surveys. © 2019 The American Astronomical Society. All rights reserved.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bardalez Gagliuffi, D. C.;  Department of Astrophysics, American Museum of Natural History, Central Park West at 79th St., New York, NY 10024, United States, Center for Astrophysics and Space Sciences, University of California, 9500 Gilman Dr., Mail Code 0424, San Diego, CA 92093, United States
Burgasser, A. J.;  Center for Astrophysics and Space Sciences, University of California, 9500 Gilman Dr., Mail Code 0424, San Diego, CA 92093, United States
Schmidt, S. J.;  Leibniz-Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, Potsdam, D-14482, Germany
Theissen, C.;  Center for Astrophysics and Space Sciences, University of California, 9500 Gilman Dr., Mail Code 0424, San Diego, CA 92093, United States
Gagné, J.;  Institute for Research on Exoplanets, Université de Montreál, Département de Physique, C.P. 6128 Succ. Centre-ville, Montreál, QC H3C3J7, Canada
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Sahlmann, J.;  Space Telescope Science Institute (STScI), 3700 San Martin Dr., Baltimore, MD 21218, United States
Faherty, J. K.;  Department of Astrophysics, American Museum of Natural History, Central Park West at 79th St., New York, NY 10024, United States
Gelino, C.;  Infrared Processing and Analysis Center (IPAC), California Institute of Technology, 117 Morrisroe Astroscience Lab, Mail Code 100-22, Pasadena, CA 91125, United States, NASA Exoplanet Science Institute (NExSci), California Institute of Technology, Mail Code 100-22, 1200 East California Blvd., Pasadena, CA 91125, United States
Cruz, K. L.;  Department of Astrophysics, American Museum of Natural History, Central Park West at 79th St., New York, NY 10024, United States, Hunter College, City University of New York, 695 Park Ave., New York, NY 10065, United States, Department of Physics, Graduate Center, City University of New York, 365 5th Ave., New York, NY 10016, United States, Center for Computational Astrophysics, Flatiron Institute, 162 5th Ave., New York, NY 10010, United States
Skrzypek, N.;  Blackett Laboratory, Imperial College, Prince Consort Rd., Kensington, London, SW72AZ, United Kingdom
Looper, D.;  CBS Studios, 4024 Radford Ave., Studio City, CA 91604, United States
Language :
English
Title :
The Ultracool SpeXtroscopic Survey. I. Volume-limited Spectroscopic Sample and Luminosity Function of M7-L5 Ultracool Dwarfs
Publication date :
2019
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
Institute of Physics Publishing
Volume :
883
Issue :
2
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 04 February 2021

Statistics


Number of views
41 (2 by ULiège)
Number of downloads
20 (2 by ULiège)

Scopus citations®
 
30
Scopus citations®
without self-citations
20
OpenCitations
 
25

Bibliography


Similar publications



Contact ORBi