The Field Substellar Mass Function Based on the Full-sky 20 pc Census of 525 L, T, and Y Dwarfs

  title={The Field Substellar Mass Function Based on the Full-sky 20 pc Census of 525 L, T, and Y Dwarfs},
  author={J. Davy Kirkpatrick and Christopher Ryan Gelino and Jacqueline K. Faherty and Aaron M. Meisner and Dan Caselden and Adam C. Schneider and Federico Marocco and Alfred J. Cayago and R. L. Smart and Peter Eisenhardt and Marc J. Kuchner and Edward L. Wright and Michael C. Cushing and Katelyn Allers and Daniella Bardalez Gagliuffi and Adam J. Burgasser and Jonathan Gagn{\'e} and Sarah E. Logsdon and Emily C. Martin and James G. Ingalls and Patrick J. Lowrance and Ellianna S. Abrahams and Christian Aganze and Roman Gerasimov and Eileen C. Gonzales and Chih-chun Hsu and Nikita Kamraj and Rocio Kiman and J. M. Rees and Christopher A. Theissen and Kareem Ammar and Nikolaj Stevnbak Andersen and Paul-Andr{\'e} Beaulieu and Guillaume Colin and Charles Elachi and Samuel J. Goodman and L{\'e}opold Gramaize and Leslie K. Hamlet and Justin Hong and Alexander F. Jonkeren and Mohammed Khalil and David W. Martin and William Pendrill and Benjamin Pumphrey and Austin Rothermich and Arttu Sainio and Andr{\'e}s Guillermo Stenner and Christopher Tanner and Melina Th{\'e}venot and N. V. Voloshin and Jim Walla and Zbigniew Wedracki},
  journal={The Astrophysical Journal Supplement Series},
We present final Spitzer trigonometric parallaxes for 361 L, T, and Y dwarfs. We combine these with prior studies to build a list of 525 known L, T, and Y dwarfs within 20 pc of the Sun, 38 of which are presented here for the first time. Using published photometry and spectroscopy as well as our own follow-up, we present an array of color–magnitude and color–color diagrams to further characterize census members, and we provide polynomial fits to the bulk trends. Using these characterizations… 
The Hawaii Infrared Parallax Program. V. New T-dwarf Members and Candidate Members of Nearby Young Moving Groups
We present a search for new planetary-mass members of nearby young moving groups (YMGs) using astrometry for 694 T and Y dwarfs, including 447 objects with parallaxes, mostly produced by recent large
Let the Great World Spin: Revealing the Stormy, Turbulent Nature of Young Giant Exoplanet Analogs with the Spitzer Space Telescope
We present a survey for photometric variability in young, low-mass brown dwarfs with the Spitzer Space Telescope. The 23 objects in our sample show robust signatures of youth and share properties
Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project
Through the Backyard Worlds: Planet 9 citizen science project, we have identified a wide-separation (∼10′, ∼9900 au projected) substellar companion to the nearby (∼17.5 pc), mid-M dwarf Ross 19. We
Discovery of CWISE J052306.42−015355.4, an Extreme T Subdwarf Candidate
We present the discovery of CWISE J052306.42−015355.4, which was found as a faint, significant proper-motion object (0.″52 ± 0.″08 yr−1) using machine-learning tools on the unWISE re-processing of
A Wide Planetary Mass Companion Discovered through the Citizen Science Project Backyard Worlds: Planet 9
Through the Backyard Worlds: Planet 9 citizen science project we discovered a late-type L dwarf co-moving with the young K0 star BD+60 1417 at a projected separation of 37″ or 1662 au. The
A rich population of free-floating planets in the Upper Scorpius young stellar association
Laboratoire d’Astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, allée Geoffroy SaintHilaire, 33615 Pessac, France University of Vienna, Department of Astrophysics, Türkenschanzstraße 17, 1180
An Improved Near-infrared Spectrum of the Archetype Y Dwarf WISEP J182831.08+265037.8
We present a Hubble Space Telescope/Wide-Field Camera 3 near-infrared spectrum of the archetype Y dwarf WISEP 182831.08+265037.8. The spectrum covers the 0.9–1.7 μm wavelength range at a resolving
Discovery of a Uniquely Cool and Compact Source at 28 pc from the Sun
We present the discovery of what appears to be both a uniquely cool and old white dwarf (WD) within 30 pc of the Sun. DES J214756.46-403529.3 is detected in four separate surveys, 50° away from the
Extensive Lensing Survey of Optical and Near-infrared Dark Objects (El Sonido): HST H-faint Galaxies behind 101 Lensing Clusters
We present a Spitzer/IRAC survey of H-faint (H 160 ≳ 26.4, < 5σ) sources in 101 lensing cluster fields. Across a CANDELS/Wide-like survey area of ∼648 arcmin2 (effectively ∼221 arcmin2 in the source
Identification of a White Dwarf Companion in the V* HP Dra System
We present Gaia DR2 2144465183642117888, a previously unknown, wide white dwarf companion to the HP Dra eclipsing binary system. This companion was discovered through the Backyard Worlds: Planet 9


Astronomical Data Analysis Software and Systems XV
The execution of a lunar shadow intercept and the conduction of an observing program from a Boeing 747-400 ER aircraft over the Antarctic interior permitted the previously unobtainable to be accomplished.
Skew frequency curves in biology- and statistics
  • J. Kapteyn
  • Biology
    Zeitschrift für induktive Abstammungs- und Vererbungslehre
  • 2005
The Hawaii Infrared Parallax Program. IV. A Comprehensive Parallax Survey of L0–T8 Dwarfs with UKIRT
We present parallaxes, proper motions, and $J$-band photometry for 348 L and T dwarfs measured using the wide-field near-infrared camera WFCAM on the United Kingdom Infrared Telescope. This is the
Skew Frequency Curves in Biology
  • 2008
Seventy six T dwarfs from the UKIDSS LAS: benchmarks, kinematics and an updated space density
  • 2013
The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
We present new evolution sequences for very low mass stars, brown dwarfs, and giant planets and use them to explore a variety of influences on the evolution of these objects. While the predicted
Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458
We present evolutionary models for cool brown dwarfs and extra-solar giant planets. The models re- produce the main trends of observed methane dwarfs in near-IR color-magnitude diagrams. We also
The Young L Dwarf 2MASS J11193254-1137466 is a Planetary-Mass Binary
We have discovered that the extremely red, low-gravity L7 dwarf 2MASS J11193254-1137466 is a 0.14" (3.6 AU) binary using Keck laser guide star adaptive optics imaging. 2MASS J11193254-1137466 has
Through a previous analysis of multi-epoch astrometry from the Wide-field Infrared Survey Explorer (WISE), I identified WISE J085510.83–071442.5 as a new high proper motion object. By combining
The Lutz–Kelker paradox
The Lutz-Kelker correction is intended to give an unbiased estimate for stellar parallaxes and magnitudes, but it is shown explicitly that it does not. This paradox results from the application of an