2020ApJ...896..173P

Query : 2020ApJ...896..173P

2020ApJ...896..173P - Astrophys. J., 896, 173-173 (2020/June-3)

2MASS J04435686+3723033 B: a young companion at the substellar boundary with potential membership in the β Pictoris moving group.

PHILLIPS C.L., BOWLER B.P., MACE G., LIU M.C. and SOKAL K.

Abstract (from CDS):

We present a detailed characterization of 2MASS J04435750+3723031, a low-mass companion orbiting the young M2 star 2MASS J04435686+3723033 at 7.''6 (550 au) with potential membership in the 23 Myr β Pictoris moving group (βPMG). Using near-infrared (NIR) spectroscopy of the companion from IRTF/SpeX, we have found a spectral type of M6 ± 1 and indications of youth through age-sensitive absorption lines and a low surface gravity index (VL-G). A young age is supported by Hα emission and lithium absorption in the host. We reevaluate the membership of this system and find that it is a marginally consistent kinematic match to the βPMG using Gaia parallaxes and new radial velocities for the host and companion. If this system does belong to the βPMG, it would be a kinematic outlier and the companion would be overluminous compared to other similar ultracool objects like PZ Tel B; this would suggest that 2M0443+3723 B could be a close binary (≃52+52 MJup if equal-flux, compared with 99 ± 5 MJup if single), and would make it the sixth substellar companion in this group. To test this hypothesis, we acquired NIR adaptive optics images with Keck II/NIRC2, but they do not resolve the companion to be a binary down to the diffraction limit of ∼3 au. If 2M0443+3723 AB does not belong to any moving group, then its age is more uncertain. In this case it is still young (<=30 Myr), and the implied mass of the companion would be between ∼30 and 110 MJup.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Low mass stars - Brown dwarfs - Direct imaging - Close binary stars

Simbad objects: 46

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Number of rows : 46
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 2MASS J00013044+1010146 LM* 00 01 30.4547047752 +10 10 14.816690076           M6V 6 0
3 LP 467-16 LM* 01 11 25.422648 +15 26 21.51204   16.19 14.43 14.07 11.03 M5V 94 0
4 G 271-110 PM* 01 36 55.1765506296 -06 47 38.002431948   15.72 14.00 13.71   M3.5V 66 0
5 2MASS J02495436-0558015 BD* 02 49 54.36624 -05 58 01.5816           L2 17 0
6 NAME Teegarden's Star LM* 02 53 00.8917932409 +16 52 52.632190137   17.21 15.14 13.03 10.65 dM6 207 0
7 Cl Alessi 13 OpC 03 27 32.7 -35 50 45           ~ 92 0
8 HD 22859 * 03 41 43.3548736272 +37 35 13.757577396   7.85 7.80     A0V 31 0
9 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
10 HD 25175 * 04 00 36.8876419032 +17 17 47.972361768   6.352 6.305     A0V 57 0
11 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
12 * 51 Eri b Pl 04 37 36.1326090888 -02 28 24.775726260           ~ 238 0
13 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
14 V* V962 Per BY* 04 43 56.8689401952 +37 23 03.362995392   15.35 13.318 12.932   M2V 38 0
15 PM J04439+3723E PM* 04 43 57.5108559336 +37 23 03.123002220           ~ 5 0
16 HD 33654 * 05 14 44.2726788240 +53 12 50.208440220 6.280 6.240 6.160     A0V 53 0
17 NAME 32 Ori group OpC 05 27 11 +06 16.0           ~ 84 0
18 NAME 118 Tau group Cl* 05 32 +24.0           ~ 24 0
19 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 2087 1
20 * bet Pic b Pl 05 47 17.0876901 -51 03 59.441135           ~ 627 1
21 NAME Columba Association As* 06 04 19.4 -22 20 40           ~ 337 0
22 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 549 0
23 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 540 0
24 L 186-67 LM* 08 22 47.4121938277 -57 26 52.937315248   14.4   12.98 10.28 M4.5 40 0
25 Cl Mamajek 1 OpC 08 42 32.9 -78 57 47           ~ 392 0
26 Cl Platais 8 OpC 09 06 04.4 -58 25 09           ~ 97 0
27 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
28 NAME eps Cha Association OpC 11 59 51 -78 12.4           ~ 188 0
29 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
30 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 894 0
31 NAME Ursa Major Cluster ClG 15 08.8 +67 07           ~ 424 1
32 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
33 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
34 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
35 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
36 VB 8 LM* 16 55 35.2557374336 -08 23 40.753073075   18.7 16.916 14.566 12.24 M7Ve 457 0
37 V* PZ Tel BY* 18 53 05.8735056984 -50 10 49.897437168   9.22 8.342   7.464 G9IV 364 0
38 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 554 0
39 VB 10 PM* 19 16 57.6109547886 +05 09 01.600923413     17.30     M8V 499 1
40 * eta Tel PM* 19 22 51.2060774616 -54 25 26.145617376   5.035 5.020   4.99 A0V 228 0
41 * eta Tel B LM* 19 22 51.3580284238 -54 25 31.569876496           M7.5V 78 0
42 NAME Coma Berenices Moving Group MGr ~ ~           ~ 103 0
43 NAME Octans Association As* ~ ~           ~ 101 0
44 NAME Carina Association As* ~ ~           ~ 188 1
45 NAME Upper CrA As* ~ ~           ~ 22 0
46 NAME Carina-near Moving Group MGr ~ ~           ~ 118 0

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