SIMBAD references

2021ApJS..253....7K - Astrophys. J., Suppl. Ser., 253, 7-7 (2021/March-0)

The field substellar mass function based on the full-sky 20 pc census of 525 L, T, and Y dwarfs.

KIRKPATRICK J.D., GELINO C.R., FAHERTY J.K., MEISNER A.M., CASELDEN D., SCHNEIDER A.C., MAROCCO F., CAYAGO A.J., SMART R.L., EISENHARDT P.R., KUCHNER M.J., WRIGHT E.L., CUSHING M.C., ALLERS K.N., BARDALEZ GAGLIUFFI D.C., BURGASSER A.J., GAGNE J., LOGSDON S.E., MARTIN E.C., INGALLS J.G., LOWRANCE P.J., ABRAHAMS E.S., AGANZE C., GERASIMOV R., GONZALES E.C., HSU C.-C., KAMRAJ N., KIMAN R., REES J., THEISSEN C., AMMAR K., ANDERSEN N.S., BEAULIEU P., COLIN G., ELACHI C.A., GOODMAN S.J., GRAMAIZE L., HAMLET L.K., HONG J., JONKEREN A., KHALIL M., MARTIN D.W., PENDRILL W., PUMPHREY B., ROTHERMICH A., SAINIO A., STENNER A., TANNER C., THEVENOT M., VOLOSHIN N.V., WALLA J., WEDRACKI Z. (The Backyard Worlds: Planet 9 Collaboration)

Abstract (from CDS):

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, we assign each object a Teff value and judge sample completeness over bins of Teff and spectral type. Except for types >=T8 and Teff < 600 K, our census is statistically complete to the 20 pc limit. We compare our measured space densities to simulated density distributions and find that the best fit is a power law (dN/dM∝M^-α^) with α = 0.6 ± 0.1. We find that the evolutionary models of Saumon & Marley correctly predict the observed magnitude of the space density spike seen at 1200 K < Teff < 1350 K, believed to be caused by an increase in the cooling timescale across the L/T transition. Defining the low-mass terminus using this sample requires a more statistically robust and complete sample of dwarfs >=Y0.5 and with Teff < 400 K. We conclude that such frigid objects must exist in substantial numbers, despite the fact that few have so far been identified, and we discuss possible reasons why they have largely eluded detection.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Stellar mass functions - Trigonometric parallax - Brown dwarfs - Solar neighborhood - Absolute magnitude - Stellar effective temperatures - L dwarfs - T dwarfs - Y dwarfs - Stellar classification - Binary stars - Two-color diagrams

VizieR on-line data: <Available at CDS (J/ApJS/253/7): table1.dat table2.dat table4.dat table5.dat table6.dat table7.dat table8.dat table9.dat table10.dat table11.dat table12.dat table14.dat table16.dat tablea1.dat refs.dat>

CDS comments: Coordinates from this article have been computed at epoch 2000 in SIMBAD (tables 5-7)

Simbad objects: 726

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