2024AJ....168..211B

Query : 2024AJ....168..211B

2024AJ....168..211B - Astron. J., 168, 211 (2024/November-0)

Discovery of 118 New Ultracool Dwarf Candidates Using Machine-learning Techniques.

BROOKS H., CASELDEN D., KIRKPATRICK J.D., RAGHU Y., ELACHI C.A., GRIGORIAN J., TREK A., WASHBURN A., HIGASHIMURA H., MEISNER A.M., SCHNEIDER A.C., FAHERTY J.K., MAROCCO F., GELINO C.R., GAGNE J., BICKLE T.P., TANG S.-Y., ROTHERMICH A., BURGASSER A.J., KUCHNER M.J., BEAULIEU P., BELL J., COLIN G., COLOMBO G., DEREVEANCO A., FLORES D.P., GLEBOV K., GRAMAIZE L., HAMLET L., HINCKLEY K., KABATNIK M., KIWY F., MARTIN D.W., PALMA MENDEZ R.F., PENDRILL B., RUIZ L., SANCHEZ J., SAINIO A., SCHUMANN J., SCHONAU M., TANNER C., STEVNBAK N., STENNER A., THEVENOT M., THAKUR V., VOLOSHIN N.V., WEDRACKI Z. (The Backyard Worlds: Planet 9 Collaboration)

Abstract (from CDS):

We present the discovery of 118 new ultracool dwarf candidates, discovered using a new machine-learning tool, named SMDET, applied to time-series images from the Wide-field Infrared Survey Explorer. We gathered photometric and astrometric data to estimate each candidate's spectral type, distance, and tangential velocity. This sample has a photometrically estimated spectral class distribution of 28 M dwarfs, 64 L dwarfs, and 18 T dwarfs. We also identify a T-subdwarf candidate, two extreme T-subdwarf candidates, and two candidate young ultracool dwarfs. Five objects did not have enough photometric data for any estimations to be made. To validate our estimated spectral types, spectra were collected for two objects, yielding confirmed spectral types of T5 (estimated T5) and T3 (estimated T4). Demonstrating the effectiveness of machine-learning tools as a new large-scale discovery technique.

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

Journal keyword(s): Brown dwarfs - Subdwarf stars - Low mass stars

VizieR on-line data: <Available at CDS (J/AJ/168/211): table1.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 6

goto Full paper

goto View the references in ADS

Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
2 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 540 0
3 [KC2019] Theia 599 As* 09 29 12.57 -59 19 59.9           ~ 5 0
4 HD 99966 * 11 30 29.8370585520 +48 56 08.557939932   7.33 7.39     A0V 53 0
5 HD 149954 SB* 16 44 27.3547856088 -72 27 16.953570288   8.99 8.88     A0V 7 0
6 NAME Oceanus Moving Group MGr ~ ~           ~ 9 0

To bookmark this query, right click on this link: simbad:objects in 2024AJ....168..211B and select 'bookmark this link' or equivalent in the popup menu