2024AJ....168..165S

Query : 2024AJ....168..165S

2024AJ....168..165S - Astron. J., 168, 165 (2024/October-0)

Eight New Substellar Hyades Candidates from the UKIRT Hemisphere Survey.

SCHNEIDER A.C., CUSHING M.C., STILLER R.A., MUNN J.A., VRBA F.J., BRUURSEMA J., WILLIAMS S.J., LIU M.C., BRAVO A., FAHERTY J.K., ROTHERMICH A., CALAMARI E., CASELDEN D., KABATNIK M., SAINIO A., BICKLE T.P., PENDRILL W., ANDERSEN N.S. and THEVENOT M.

Abstract (from CDS):

We have used the UKIRT Hemisphere Survey combined with the UKIDSS Galactic Cluster Survey, the UKIDSS Galactic Plane Survey, and the CatWISE2020 catalog to search for new substellar members of the nearest open cluster to the Sun, the Hyades. Eight new substellar Hyades candidate members were identified and observed with the Gemini/GNIRS near-infrared spectrograph. All eight objects are confirmed as brown dwarfs with spectral types ranging from L6 to T5, with two objects showing signs of spectral binarity and/or variability. A kinematic analysis demonstrates that all eight new discoveries likely belong to the Hyades cluster, with future radial velocity and parallax measurements needed to confirm their membership. CWISE J042356.23+130414.3, with a spectral type of T5, would be the coldest (Teff ≈ 1100 K) and lowest-mass (M ≈ 30 MJup) free-floating member of the Hyades yet discovered. We further find that high-probability substellar Hyades members from this work and previous studies have redder near-infrared colors than field-age brown dwarfs, potentially due to lower surface gravities and supersolar metallicities.

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

Journal keyword(s): L dwarfs - T dwarfs - Brown dwarfs - Open star clusters

Simbad objects: 32

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Number of rows : 32
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 2MASS J02004709-5105206 BD* 02 00 47.09472 -51 05 20.6088           L7 8 0
2 DENIS J025503.3-470049 BD* 02 55 03.6927058871 -47 00 51.356903955     22.921 19.906 17.454 L9 170 0
3 2MASS J03162759+2650277 BD* 03 16 27.59976 +26 50 27.7548           T2.5 12 0
4 2MASS J03290567+1322317 BD? 03 29 05.67408 +13 22 31.7208           ~ 8 0
5 CWISE J033817.87+171744.1 BD* 03 38 17.87 +17 17 44.1           L7 3 0
6 2MASS J04123269+1044078 BD* 04 12 32.69040 +10 44 07.8000           L5: 5 0
7 WISE J041259.85+085049.7 BD* 04 12 59.895432 +08 50 49.59638           T3pec 1 0
8 2MASS J04183483+2131275 BD* 04 18 34.83048 +21 31 27.5124           L5 13 0
9 CWISE J041953.55+203628.0 BD* 04 19 53.49144 +20 36 28.3356           T4 3 0
10 WISE J042222.12+213900.6 BD* 04 22 22.176178 +21 39 00.41743           L5-7 1 0
11 CWISE J042356.23+130414.3 BD* 04 23 56.239240 +13 04 14.36436           T5 1 0
12 2MASS J04241856+0637448 BD* 04 24 18.56640 +06 37 44.8500           L4 5 0
13 2MASS J04273126+0743453 BD* 04 27 31.26576 +07 43 45.3396           L7 3 0
14 CWISE J043018.70+105857.1 BD* 04 30 18.66216 +10 58 57.3852           T3 3 0
15 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
16 WISE J043511.21+213846.5 BD* 04 35 11.269609 +21 38 46.31590           L7.5 1 0
17 2MASS J04364267+1901351 BD* 04 36 42.67872 +19 01 35.1768           L6 7 0
18 2MASS J04385515+0423001 BD? 04 38 55.15920 +04 23 00.1176           ~ 6 0
19 2MASS J04410548+2130019 BD* 04 41 05.48424 +21 30 01.9836           L5 6 0
20 WISE J044116.02+143645.6 BD* 04 41 16.073557 +14 36 45.35506           T2 1 0
21 CWISE J044354.22+125736.7 BD* 04 43 54.221297 +12 57 36.69474           L9pec 1 0
22 WISE J045800.66+100456.5 BD* 04 58 00.697686 +10 04 56.93138           T2pec 1 0
23 WISE J051215.84+165818.3 BD* 05 12 15.867435 +16 58 18.01069           L9 1 0
24 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1080 0
25 2MASSI J0825196+211552 BD* 08 25 19.6125672818 +21 15 51.549358145       21.97 19.22 L7.5V 138 0
26 2MASSI J1010148-040649 BD* 10 10 14.80704 -04 06 49.9320           L6 73 0
27 2MASS J12095613-1004008 BD* 12 09 56.13096 -10 04 00.8076           T2+T7.5 67 0
28 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 167 0
29 2MASS J15031961+2525196 BD* 15 03 19.6109033841 +25 25 19.795679019           T5.5 84 0
30 2MASS J16322911+1904407 BD* 16 32 29.11416 +19 04 40.7136       22.42 19.98 L8V 145 0
31 CFBDS J213926+022023 BD* 21 39 26.76936 +02 20 22.6968           L8.5+T3.5 108 0
32 2MASS J22393718+1617127 BD* 22 39 37.18608 +16 17 12.7500           T3 21 0

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