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2024ApJS..271...55K - Astrophys. J., Suppl. Ser., 271, 55 (2024/April-0)

The Initial Mass Function Based on the Full-sky 20 pc Census of ∼3600 Stars and Brown Dwarfs.

KIRKPATRICK J.D., MAROCCO F., GELINO C.R., RAGHU Y., FAHERTY J.K., BARDALEZ GAGLIUFFI D.C., SCHURR S.D., APPS K., SCHNEIDER A.C., MEISNER A.M., KUCHNER M.J., CASELDEN D., SMART R.L., CASEWELL S.L., RADDI R., KESSELI A., ANDERSEN N.S., ANTONINI E., BEAULIEU P., BICKLE T.P., BILSING M., CHIENG R., COLIN G., DEEN S., DEREVEANCO A., DOLL K., DURANTINI LUCA H.A., FRAZER A., GANTIER J.M., GRAMAIZE L., GRANT K., HAMLET L.K., HIGASHIMURA H., HYOGO M., JALOWICZOR P.A., JONKEREN A., KABATNIK M., KIWY F., MARTIN D.W., MICHAELS M.N., PENDRILL W., PESSANHA MACHADO C., PUMPHREY B., ROTHERMICH A., RUSSWURM R., SAINIO A., SANCHEZ J., SAPELKIN-TAMBLING F.T., SCHUMANN J., SELG-MANN K., SINGH H., STENNER A., SUN G., TANNER C., THEVENOT M., VENTURA M., VOLOSHIN N.V., WALLA J., WEDRACKI Z., ADORNO J.I., AGANZE C., ALLERS K.N., BROOKS H., BURGASSER A.J., CALAMARI E., CONNOR T., COSTA E., EISENHARDT P.R., GAGNE J., GERASIMOV R., GONZALES E.C., HSU C.-C., KIMAN R., LI G., LOW R., MAMAJEK E., PANTOJA B.M., POPINCHALK M., REES J.M., STERN D., SUAREZ G., THEISSEN C., TSAI C.-W., VOS J.M., ZUREK D. (The Backyard Worlds: Planet 9 Collaboration)

Abstract (from CDS):

A complete accounting of nearby objects-from the highest-mass white dwarf progenitors down to low-mass brown dwarfs-is now possible, thanks to an almost complete set of trigonometric parallax determinations from Gaia, ground-based surveys, and Spitzer follow-up. We create a census of objects within a Sun-centered sphere of 20 pc radius and check published literature to decompose each binary or higher-order system into its separate components. The result is a volume-limited census of ∼3600 individual star formation products useful in measuring the initial mass function across the stellar (<8M⊙) and substellar (≳5MJup) regimes. Comparing our resulting initial mass function to previous measurements shows good agreement above 0.8M⊙ and a divergence at lower masses. Our 20 pc space densities are best fit with a quadripartite power law, $\xi (M)={dN}/{dM}\propto {M}^{-\alpha }$, with long-established values of α = 2.3 at high masses (0.55 < M < 8.00M⊙), and α = 1.3 at intermediate masses (0.22 < M < 0.55M⊙), but at lower masses, we find α = 0.25 for 0.05 < M < 0.22M⊙, and α = 0.6 for 0.01 < M < 0.05M⊙. This implies that the rate of production as a function of decreasing mass diminishes in the low-mass star/high-mass brown dwarf regime before increasing again in the low-mass brown dwarf regime. Correcting for completeness, we find a star to brown dwarf number ratio of, currently, 4:1, and an average mass per object of 0.41 M⊙.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Initial mass function - Stellar mass functions - Brown dwarfs - Trigonometric parallax - Solar neighborhood - Binary stars

VizieR on-line data: <Available at CDS (J/ApJS/271/55): table1-15.dat table18.dat tablea2.dat tablea3.dat tablea4.dat tableb1.dat notes.dat refs.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD; there are some issues with cross-identifications or classifications.

Simbad objects: 1067

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