MEETING THE COOL NEIGHBORS. X. ULTRACOOL DWARFS FROM THE 2MASS ALL-SKY DATA RELEASE

By I. Neill Reid, Kelle Cruz, J. D. Kirkpatrick, P. R. Allen, Finlay S. Mungall, J. Liebert, P. Lowrance, A. Sweet. 2008

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Using data from the 2 Micron All Sky Survey All-Sky Point Source Catalogue, we have extended our census of nearby ultracool dwarfs to cover the full celestial sphere above Galactic latitude of 15°. Starting with an initial catalog of 2,139,484 sources, we have winnowed the sample to 467 candidate late-type M or L dwarfs within 20 pc of the Sun. Fifty-four of those sources already have spectroscopic observations confirming them as late-type dwarfs. We present optical spectroscopy of 376 of the remaining 413 sources, and identify 44 as ultracool dwarfs with spectroscopic distances less than 20 pc. Twenty-five of the 37 sources that lack optical data have near-infrared spectroscopy. Combining the present sample with our previous results and data from the literature, we catalog 94 L dwarf systems within 20 pc. We discuss the distribution of activity, as measured by Hα emission, in this volume-limited sample. We have coupled the present ultracool catalog with data for stars in the northern 8 pc sample and recent (incomplete) statistics for T dwarfs to provide a snapshot of the current 20 pc census as a function of spectral type.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/d8ee2daedea1992102724b7cd6512030f5cbe998

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Citations in the corpus

THE HAWAII INFRARED PARALLAX PROGRAM. I. ULTRACOOL BINARIES AND THE L/T TRANSITION, (2012, methodology): “…et al. (2006); (81) Pinfield et al. (2012); (82) Reid et al. (1995); (83) Reid et al. (2003a); (84) Reid et al. (2003b); (85) Reid et al. (2004); (86) Reid et al. (2008b); (87) Reiners & Basri (2006); (88) Riaz et al. (2006); (89) Ruiz et al. (1991); (90) Schilbach et al. (2009); (91)…”
Individual Dynamical Masses of Ultracool Dwarfs (2017, unknown): “Seven more systems have published spectra that exclude lithium absorption in integrated light: LP 349-25AB (<0.5 Å; Reiners & Basri 2009), 2MASS J0700+3157AB (<0.3 Å; Thorstensen & Kirkpatrick 2003), LHS 2397aAB (<0.5 Å; Reiners & Basri 2009), 2MASS J1728+3948AB (<4 Å; Kirkpatrick et al. 2000), ”
A NEAR-INFRARED SPECTROSCOPIC STUDY OF YOUNG FIELD ULTRACOOL DWARFS (2013, background): “A number of field brown dwarfs having spectroscopic indicators of youth have been reported (e.g. Reid et al. 2008; Cruz et al. 2004).”
BANYAN. II. VERY LOW MASS AND SUBSTELLAR CANDIDATE MEMBERS TO NEARBY, YOUNG KINEMATIC GROUPS WITH PREVIOUSLY KNOWN SIGNS OF YOUTH (2013, background): “2MASS J23225299–6151275 is an L2γ BD with signs of low gravity in its optical spectrum and NIR colors unusually red for its spectral type (Reid et al. 2008a, Cruz et al. 2009, Faherty et al. 2013b).”
THE EXTREMELY RED, YOUNG L DWARF PSO J318.5338−22.8603: A FREE-FLOATING PLANETARY-MASS ANALOG TO DIRECTLY IMAGED YOUNG GAS-GIANT PLANETS (2013, background): “5−22 was not discovered by previous large-area searches for L dwarfs using 2MASS (Reid et al. 2008; Cruz et al. 2003).”
COLORS AND KINEMATICS OF L DWARFS FROM THE SLOAN DIGITAL SKY SURVEY (2010, background): “Many known L dwarfs are the result of surveys that made cuts in J − KS to separate L dwarfs from the ubiquitous M dwarfs (Kirkpatrick et al. 1999, 2000; Cruz et al. 2003, 2007; Reid et al. 2008).”
Global Climate and Atmospheric Composition of the Ultra-hot Jupiter WASP-103b from HST and Spitzer Phase Curve Observations (2018, methodology): “For 1320+0409 we used SDSS, WISE and 2MASS photometry along with the optical spectrum from Reid et al. (2008), the near in- frared spectrum from Bardalez Gagliuffi et al. (2014), and the parallax reported in Faherty et al. (2012).”
THE HAWAII INFRARED PARALLAX PROGRAM. II. YOUNG ULTRACOOL FIELD DWARFS (2016, background): “Reid et al. (2008) report component optical spectral types of M9 and L0, respectively.”
The Field Substellar Mass Function Based on the Full-sky 20 pc Census of 525 L, T, and Y Dwarfs (2020, background): “…et al. 2014, (107) Reid, et al. 2000, (108) Knapp et al. 2004, (109) Wilson, et al. 2003, (110) Cruz et al. 2009, (111) Kendall et al. 2007, (112) Reid et al. 2008, (113) Liebert, et al. 2003, (114) Schneider, et al. 2014, (115) Cruz, et al. 2003, (116) Golimowski et al. 2004, (117) Reid, et…”
HST SPECTRAL MAPPING OF L/T TRANSITION BROWN DWARFS REVEALS CLOUD THICKNESS VARIATIONS (2013, background): “Target 2M2139 (or 2MASS J21392676+0220226) has been classified as a T0 dwarf based on red optical spectrum (Reid et al. 2008) and as a peculiar T2.”
FUNDAMENTAL PARAMETERS AND SPECTRAL ENERGY DISTRIBUTIONS OF YOUNG AND FIELD AGE OBJECTS WITH MASSES SPANNING THE STELLAR TO PLANETARY REGIME (2015, unknown): “…(26) Kirkpatrick et al. (1997), (27) Tinney (1993), (28) Burgasser et al. (2008b), (29) Mace et al. (2013), (30) Kirkpatrick et al. (2008), (31) Reid et al. (2008), (32) Chiu et al. (2006), (33) Burgasser et al. (2008c), (34) Kirkpatrick et al. (2010), (35) Kirkpatrick et al. (1999), (36)…”