2023ApJ...945..119G

Query : 2023ApJ...945..119G

2023ApJ...945..119G - Astrophys. J., 945, 119 (2023/March-2)

The Oceanus Moving Group: A New 500 Myr Old Host for the Nearest Brown Dwarf.

GAGNE J., MORANTA L., FAHERTY J.K., KIMAN R., COUTURE D., LAROCHELLE A.R., POPINCHALK M. and MORRONE D.

Abstract (from CDS):

We report the discovery of the Oceanus moving group, a ≈500 Myr old group with 50 members and candidate members at distances 2-50 pc from the Sun, using an unsupervised clustering analysis of nearby stars with Gaia DR3 data. This new moving group includes the nearest brown dwarf WISE J104915.57-531906.1 AB (Luhman 16 AB) at a distance of 2 pc, which was previously suspected to be young (600-800 Myr) based on a comparison of its dynamical mass measurements with brown dwarf evolutionary models. We use empirical color-magnitude sequences, stellar activity, and gyrochronology to determine that this new group is roughly coeval with the Coma Ber open cluster, with an isochronal age of 510 ± 95 Myr. This newly discovered group will be useful to refine the age and chemical composition of Luhman 16 AB, which is already one of the best substellar benchmarks known to date. Furthermore, the Oceanus moving group is one of the nearest young moving groups identified to date, making it a valuable laboratory for the study of exoplanets and substellar members, with eight brown dwarf candidate members already identified here.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Stellar associations - Open star clusters - Stellar kinematics - Brown dwarfs

VizieR on-line data: <Available at CDS (J/ApJ/945/119): table1.dat table2.dat table3.dat table4.dat>

Nomenclature: NAME Oceanus Moving Group N=1.

Simbad objects: 116

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Number of rows : 116
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 NAME THA MGr 00 00 -62.0           ~ 540 0
2 LP 149-56 B PM* 00 21 57.6585020880 +49 12 38.914358364           ~ 4 0
3 LP 149-56 A PM* 00 21 57.8583499584 +49 12 37.838494512           ~ 5 0
4 LSPM J0125+7540 PM* 01 25 07.9877916240 +75 40 34.102477236   16.6   15.4   ~ 5 0
5 NGC 800 GiP 02 02 11.8416577848 -00 07 49.501608132   14.7       ~ 45 0
6 2MASS J02330440+3134404 LM* 02 33 04.4252306856 +31 34 40.317354588           ~ 6 0
7 * 51 Ari PM* 03 02 26.0263370112 +26 36 33.260418324       6.2   G8V 176 0
8 LSPM J0315+8122 LM* 03 15 58.4187125952 +81 22 45.357579120   20.3   18.3   ~ 6 0
9 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
10 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
11 NAME CAS-TAU ASS MGr 04 16 +27.6           ~ 86 1
12 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
13 NGC 1662 OpC 04 48 48.5 +10 52 46   7.0 6.4     ~ 149 0
14 Gaia DR3 497621340484242560 PM* 04 57 32.1901626287 +72 00 40.199915041           ~ 3 0
15 Gaia DR3 287767756635519488 PM* 05 43 18.8451439937 +64 22 53.062828647           ~ 3 0
16 Gaia DR3 287767760932246144 PM* 05 43 18.9071869977 +64 22 52.527272304           ~ 3 0
17 NAME Columba Association As* 06 04 19.4 -22 20 40           ~ 337 0
18 LP 205-44 PM* 06 31 50.7381977376 +41 29 45.488163624   16.50   14.462   dM5.0 65 0
19 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 540 0
20 V* YZ CMi PM* 07 44 40.1723046464 +03 33 08.875227574 13.761 12.831 11.225 9.958 8.263 M4.0Ve 957 0
21 MCC 516 PM* 08 12 14.4386400456 +51 54 25.520407524       9.766   K7-V 35 0
22 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
23 HD 77006 PM* 09 01 37.0376721240 +49 44 12.579527760       7.5   G5 54 0
24 HD 77006B PM* 09 01 37.0755330287 +49 44 11.165526534           ~ 2 0
25 TYC 3424-1000-1 PM* 09 13 53.3212136256 +46 29 26.100028896   11.97 10.86     ~ 4 0
26 NAME Volans-Carina Association As* 09 37 00.0 -65 18 00           ~ 24 0
27 2MASS J10461875+4441149 BD* 10 46 18.7817297760 +44 41 14.738659584           L4 10 0
28 NAME Luhman 16A BD* 10 49 14.0238534572 -53 19 05.005159625           L7.5 64 0
29 NAME Luhman 16B BD* 10 49 14.0744805001 -53 19 05.800116097           T0.5 77 0
30 NAME Luhman 16 ** 10 49 18.91536 -53 19 10.0776   16.86 16.20   14.95 L7.5+T0.5 120 0
31 2MASS J10501987+5214498 NIR 10 50 19.87896 +52 14 49.8516           ~ 1 0
32 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
33 V* YY LMi RS* 11 03 14.4677238480 +30 35 31.300805724       8.4   K2.5Vk 28 0
34 HD 97334B BD* 11 12 25.6353966120 +35 48 12.742807176           L4.5+L6 95 0
35 HD 97334 BY* 11 12 32.3503039560 +35 48 50.688978228   7.02 6.41     G2 306 0
36 G 120-40 PM* 11 21 55.4181739337 +26 49 51.026694002   15.4   13.951   dM4.5 17 0
37 CWISE J114202.84+412337.5 MIR 11 42 02.842492 +41 23 37.55125           ~ 1 0
38 Gaia DR3 840562487518931968 PM* 11 46 36.3513422591 +53 28 29.670601774           ~ 3 0
39 SIPS J1208-0028 LM* 12 08 11.1886262036 -00 28 12.486609360           M3.7 7 0
40 SDSS J120815.59+084543.0 WD* 12 08 15.6129804048 +08 45 43.165145952         17.77 DA 12 0
41 2MASS J12081689+0845279 LM* 12 08 16.8921369456 +08 45 28.099668096         17.67 M9V 11 0
42 Cl Melotte 111 OpC 12 11 54.9 +25 16 36           ~ 520 0
43 2MASS J12173513+4909136 LM* 12 17 35.1216359784 +49 09 13.637110356           ~ 3 0
44 HD 111395 BY* 12 48 47.0481446766 +24 50 24.818642182   6.98   5.8   G5V 206 0
45 2MASS J12543853+4346573 BD? 12 54 38.534 +43 46 57.37           ~ 2 0
46 LSPM J1338+0744 PM* 13 38 35.5090955160 +07 44 47.319191376   16.7   14.8   M3 6 0
47 HD 120476A PM* 13 49 04.0021505633 +26 58 47.754351504   8.35 7.24 8.02   K4V 58 0
48 HD 120476B PM* 13 49 04.0331981570 +26 58 44.203922052   9.24 8.01     K6V 41 0
49 2MASS J14002320+4338222 BD* 14 00 23.20392 +43 38 22.2252           L8 19 0
50 V* GZ Boo BY* 14 21 08.8588042176 +37 24 03.696923088   9.77 8.87 8.2   K0 34 0
51 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 894 0
52 PM J14388+4213 ** 14 38 51.86880 +42 13 44.4828   13.530 12.007 11.539   M1.5V 12 0
53 Gaia DR3 6256762847617655040 PM* 15 05 33.6327697356 -19 37 28.271987684           ~ 2 0
54 PM J15098-0007 PM* 15 09 50.6488035600 -00 07 51.700271196     12.334 11.913   ~ 10 0
55 ULAS J151637.89+011050.1 BD* 15 16 37.89408 +01 10 50.0772           T6.5 3 0
56 StKM 1-1254 PM* 15 33 25.2256479456 +13 40 58.429103916   12.24 11.15     K4/5 7 0
57 2MASS J15332580+1340583 LM* 15 33 25.7980176576 +13 40 58.301976576           ~ 4 0
58 GALEX J153417.4+021847 WD* 15 34 17.5028368656 +02 18 48.121120368     16.43     DA5.5 28 0
59 HD 143295 PM* 15 59 42.2927299440 -05 04 34.465296540   9.98 9.05     K2V 44 0
60 Gaia DR3 4398623381046659712 PM* 15 59 43.6366070480 -05 04 56.785017174           ~ 4 0
61 Gaia DR3 4398623381046658176 PM* 15 59 43.7303497520 -05 05 02.969657140           ~ 4 0
62 Gaia DR3 4425428271944225152 PM* 16 00 24.6563077794 +04 07 17.570608463           ~ 2 0
63 2MASS J16042049-1331235 WD* 16 04 20.4714343824 -13 31 23.839706748           DA 9 0
64 Gaia DR3 1198870718304793600 PM* 16 11 52.5164155745 +17 10 16.881334143           ~ 3 0
65 Gaia DR3 1198870714007305472 PM* 16 11 52.5535007682 +17 10 18.510809730           ~ 3 0
66 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
67 2MASS J16303054+4344032 BD* 16 30 30.54336 +43 44 03.2964           L8.5 18 0
68 2MASS J16310254+5413364 PM* 16 31 02.5490270008 +54 13 36.466093659           M3 5 0
69 PM J16350+1807B PM* 16 35 01.6569627825 +18 07 45.181803171           ~ 3 0
70 PM J16350+1807 PM* 16 35 01.6820247840 +18 07 46.531853256     12.583 12.088   M0 7 0
71 Gaia DR3 4131855643673923456 PM* 16 37 25.4035773015 -18 12 04.732297758           ~ 2 0
72 Gaia DR3 4565621227164694016 PM* 16 45 18.8614279739 +21 25 05.064050274           ~ 3 0
73 2MASS J16534979-0316483 LM* 16 53 49.8006110184 -03 16 48.369495432           ~ 3 0
74 2MASS J16573454+1054233 BD* 16 57 34.5532604352 +10 54 23.474659644           L1.4V 20 0
75 Gaia DR3 4142797124397766144 PM* 17 16 49.4417273426 -11 28 14.268305808           ~ 2 0
76 2MASSI J1726000+153819 BD* 17 26 00.07752 +15 38 19.0140           L2V 49 0
77 HD 157750 SB* 17 26 34.8623612184 -32 58 10.783731792   8.65 8.04     G3V 65 0
78 RX J1727.6-3559 WD* 17 27 37.8466377264 -36 00 14.497536312   15.35 15.42 15.83   DA1.5 31 0
79 WISE J174640.78-033818.0 BD* 17 46 40.77648 -03 38 16.7339           T6 9 0
80 Gaia DR3 4070503994477694592 PM* 17 48 58.8344262763 -21 58 38.402141198           ~ 2 0
81 Gaia DR3 4070503990056958336 PM* 17 48 58.8462664768 -21 58 38.988374688           ~ 2 0
82 2MASS J17502385+4222373 BD* 17 50 23.85336 +42 22 37.3476           T1 24 0
83 UCAC4 616-058177 WD* 17 53 52.1571326736 +33 06 22.621374396   13.34 13.24 14.06   DA 16 0
84 BD+18 3497B PM* 17 55 43.6500762768 +18 29 55.947903000       11.27   M1 5 0
85 BD+18 3497 PM* 17 55 44.8981205376 +18 30 01.385136504 11.495 10.35 9.151 8.427 7.824 K5V 91 0
86 Gaia DR3 4179006928523166848 * 18 01 01.9545537016 -01 15 54.735351246           ~ 2 0
87 Gaia DR3 2123230006336124672 * 18 04 41.3421350370 +49 51 51.272808144           ~ 2 0
88 Gaia DR3 4093901803653552896 * 18 10 33.5279970650 -21 03 00.313375257           ~ 2 0
89 2MASS J18341725-2754057 LM* 18 34 17.2486968668 -27 54 05.998397070           ~ 3 0
90 Gaia DR3 4283856426084064896 * 18 34 43.1070439666 +04 42 59.045131031           ~ 1 0
91 IC 4756 OpC 18 38 39.0 +05 26 14           ~ 274 0
92 Gaia DR3 4532743213861815680 * 18 45 39.7452092826 +23 37 09.230948700           ~ 1 0
93 Gaia DR3 4085939110418175104 PM* 18 53 05.2008266046 -20 01 56.633563060           ~ 2 0
94 Gaia DR3 4531380614012656512 * 18 54 47.8174938976 +22 01 57.211663329           ~ 1 0
95 Gaia DR3 4313402227672695808 * 19 01 11.0265038770 +11 19 35.857891949           ~ 1 0
96 Gaia DR3 4514591346333008640 * 19 05 15.8778550127 +17 55 18.530277912           ~ 1 0
97 Gaia DR3 4514524757179567744 * 19 08 06.3524077401 +18 06 28.995260725           ~ 1 0
98 PM J19098+0742A PM* 19 09 51.3869999837 +07 42 08.040811901           ~ 2 0
99 PM J19098+0742 ** 19 09 51.3924911429 +07 42 07.985834983   13.385 11.903 11.509   ~ 4 0
100 PM J19098+0742B PM* 19 09 51.4258677775 +07 42 07.471636240           ~ 2 0
101 Gaia DR3 4314500777213121152 * 19 32 06.4930361602 +10 18 21.672064304           ~ 1 0
102 Gaia DR3 4296150542331441152 * 19 32 57.5929106049 +08 52 40.200277851           ~ 1 0
103 NGC 6811 OpC 19 37 21.8 +46 22 43   7.47 6.8     ~ 435 0
104 Gaia DR2 2078105327586616832 WD? 19 41 45.6673519889 +43 44 58.288413673           ~ 4 0
105 2MASS J19475805+2127173 LM* 19 47 58.0551565128 +21 27 17.384169528           ~ 3 0
106 [KC2019] Theia 209 MGr 19 51 48.52 +30 31 53.4           ~ 4 0
107 * 43 Cyg gD* 20 27 02.2674936096 +49 23 00.104394552   6.024 5.715     F0V: 64 0
108 * 43 Cyg B PM* 20 27 05.4355054335 +49 22 13.944063885       12.905   ~ 2 0
109 HD 207485 PM* 21 45 52.6387262664 +70 20 53.017710504   8.70 8.00     G5V 37 0
110 LP 26-356 PM* 21 52 29.6688421944 +78 05 32.406837684           ~ 5 0
111 LP 48-485 Em* 23 24 26.5370678520 +73 57 43.737139080   15.3   13.9   dM4.5 18 0
112 NAME Oceanus Moving Group MGr ~ ~           ~ 9 0
113 NAME Argus Association As* ~ ~           ~ 266 0
114 NAME Pleiades Moving Group MGr ~ ~           ~ 297 0
115 NAME Carina-near Moving Group MGr ~ ~           ~ 118 0
116 [MGC2022] Crius 224 MGr ~ ~           ~ 4 0

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