2020A&A...642A.179M

Query : 2020A&A...642A.179M

2020A&A...642A.179M - Astronomy and Astrophysics, volume 642A, 179-179 (2020/10-1)

Dynamical traceback age of the β Pictoris moving group.

MIRET-ROIG N., GALLI P.A.B., BRANDNER W., BOUY H., BARRADO D., OLIVARES J., ANTOJA T., ROMERO-GOMEZ M., FIGUERAS F. and LILLO-BOX J.

Abstract (from CDS):


Context. The β Pictoris moving group is one of the most well-known young associations in the solar neighbourhood and several members are known to host circumstellar discs, planets, and comets. Measuring its age precisely is essential to the study of several astrophysical processes, such as planet formation and disc evolution, which are strongly age-dependent.
Aims. We aim to determine a precise and accurate dynamical traceback age for the β Pictoris moving group.
Methods. Our sample combines the extremely precise Gaia DR2 astrometry with ground-based radial velocities measured in an homogeneous manner. We use an updated version of our algorithm to determine dynamical ages. The new approach takes into account a robust estimate of the spatial and kinematic covariance matrices of the association to improve the sample selection process and to perform the traceback analysis.
Results. We estimate a dynamical age of 18.5–2.4+2.0Myr for the β Pictoris moving group. We investigated the spatial substructure of the association at the time of birth and we propose the existence of a core of stars that is more concentrated. We also provide precise radial velocity measurements for 81 members of β Pic, including ten stars with the first determinations of their radial velocities.
Conclusions. Our dynamical traceback age is three times more precise than previous traceback age estimates and, more importantly, for the first time it reconciles the traceback age with the most recent estimates of other dynamical, lithium depletion boundaries and isochronal ages. This has been possible thanks to the excellent astrometric and spectroscopic precisions, the homogeneity of our sample, and the detailed analysis of binaries and membership.

Abstract Copyright: © N. Miret-Roig et al. 2020

Journal keyword(s): Galaxy: kinematics and dynamics - solar neighborhood - stars: kinematics and dynamics - open clusters and associations: individual: beta Pictoris - stars: formation

VizieR on-line data: <Available at CDS (J/A+A/642/A179): tablec7.dat>

Simbad objects: 98

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Number of rows : 98
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 2MASS J00160844-0043021 BD* 00 16 08.47416 -00 43 02.2944           L5.5 12 0
2 SCR J0017-6645 Er* 00 17 23.5412251800 -66 45 12.332320668   14.014 12.494 11.943 10.00 M3.0Ve 42 0
3 GJ 2006 A Er* 00 27 50.2331765568 -32 33 06.306392340   14.33 12.95 11.79 10.29 M3.5Ve 40 0
4 GJ 2006 B Er* 00 27 50.3535388992 -32 33 24.130761048   14.66 13.25 12.04 10.48 M3.5Ve 35 0
5 LP 525-39 ** 00 32 34.799160 +07 29 26.95704   14.189 12.823 12.253   M3Ve 43 0
6 LP 467-16 LM* 01 11 25.422648 +15 26 21.51204   16.19 14.43 14.07 11.03 M5.93 84 0
7 G 271-110 Er* 01 36 55.1765506296 -06 47 38.002431948   15.72 14.00 13.71   M3.5V 57 0
8 V* EX Cet BY* 01 37 35.4667815000 -06 45 37.529924796 8.862 8.459 7.656 7.218 6.817 K0/1V 142 0
9 RX J0153.5-1459 ** 01 53 50.773992 -14 59 50.34912   13.49 12.01 11.91 9.349 M3 30 0
10 HD 14082B BY* 02 17 24.7369490496 +28 44 30.411007188   8.33 7.74     G2V 110 0
11 LP 353-51 PM* 02 23 26.6464321080 +22 44 06.759592152   13.28 11.250 10.697   M1V 56 0
12 BD+30 397B PM* 02 27 28.0554707280 +30 58 40.362507732   14.05 12.55     K7 45 0
13 BD+30 397 PM* 02 27 29.2543096632 +30 58 24.596323968   11.3 10.12 9.32 8.78 K7V 106 1
14 RX J0332.6+2843 ** 03 32 35.789664 +28 43 55.33824   15.422 13.880 13.582   M4.5V 30 0
15 StKM 1-433 Er* 03 57 33.9307190064 +24 45 10.643102280     12.617 12.175   M2 20 0
16 2MASS J03582255-4116060 BD* 03 58 22.55064 -41 16 06.0420           L6pec 15 0
17 2MASSI J0421072-630602 BD* 04 21 07.18488 -63 06 02.2464           L5beta 20 0
18 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1357 0
19 StKM 1-497 TT* 04 37 37.4553491592 -02 29 28.950973764   12.04 10.59   8.59 M1.1V 127 0
20 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4414 0
21 V* V1005 Ori BY* 04 59 34.8342878424 +01 47 00.669818328   11.48 10.107 9.603 8.239 M0Ve 342 0
22 CD-57 1054 Er* 05 00 47.1296589456 -57 15 25.452888732   11.36 9.977 9.889 8.177 M0Ve 125 0
23 HD 286264 TT* 05 00 49.2839822400 +15 27 00.696781296   12.07 10.83 10.08 9.354 K2IV 39 1
24 LP 476-207 SB* 05 01 58.79419 +09 58 59.2855   12.93 11.53 10.33 8.708 M3.5V 117 0
25 NAME BD-21 1074BC ** 05 06 49.4780711 -21 35 03.735000   13.163 11.500 9.92 8.45 M3.5V 42 0
26 BD-21 1074A Er* 05 06 49.9162124448 -21 35 09.128916564   11.86 10.41 9.40 9.07 M2 80 0
27 2MASS J05120636-2949540 BD* 05 12 06.36720 -29 49 54.0084           L5 23 0
28 PM J05243-1601 ** 05 24 19.136688 -16 01 15.27024   15.17 13.57 13.29   M4.5 33 0
29 V* V1311 Ori BY* 05 32 04.5017687952 -03 05 29.400403884   13.37 11.437 11.019 9.153 M1.5V 67 0
30 SCR J0533-4257 LM* 05 33 28.0374734304 -42 57 20.547739296           M4.5 25 0
31 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1902 1
32 RX J0613.2-2742 ** 06 13 13.3189126176 -27 42 05.573884860   13.77 12.30 11.10 9.52 M3.5 38 0
33 V* AO Men Er* 06 18 28.2078302088 -72 02 41.447954904   11.06 9.809 9.299 8.456 K4Ve 140 0
34 NAME eta Cha Association OpC 08 42 32.9 -78 57 47           ~ 363 0
35 V* EQ Cha TT* 08 47 56.7585043512 -78 54 53.185560516   14.777 13.308 12.802 10.795 M3 80 0
36 MCC 124 BY* 10 14 19.1632274905 +21 04 29.817290641 12.667 11.451 10.083 9.155 8.250 M0.7V 121 1
37 TWA 22 LXB 10 17 26.8927745040 -53 54 26.387425044   15.69 13.96 13.72   M5 83 0
38 V* DZ Cha TT* 11 49 31.8528592968 -78 51 01.062617652   14.330 12.766 12.511 10.732 M0Ve 73 0
39 UPM J1354-7121 LM* 13 54 53.9032843176 -71 21 47.729281248   13.72 12.24 11.82 9.80 M2.5 24 0
40 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 774 0
41 * alf Cir a2* 14 42 30.4206520931 -64 58 30.478845491 3.55 3.43 3.19 2.96 2.86 A7VpSrCrEu 364 0
42 HD 139084B PM* 15 38 56.7796135536 -57 42 18.954140724     14.80 14.88 11.73 M5Ve 27 1
43 HD 139084 SB* 15 38 57.5566916952 -57 42 27.346084668   8.78 7.977   7.106 K0V 162 0
44 UPM J1612-4556 PM* 16 12 05.1591056544 -45 56 24.288424368   16.18 14.44 14.14   ~ 4 0
45 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3628 1
46 TYC 8726-1327-1 LM* 16 57 20.2671636792 -53 43 31.584535032           M3 29 0
47 2MASS J17020937-6734447 PM* 17 02 09.3746177496 -67 34 44.725571940           ~ 3 0
48 UPM J1702-4521 PM* 17 02 40.1563569936 -45 21 58.720175712   13.232 11.725 11.320   ~ 6 0
49 2MASS J17092947-5235197 Y*? 17 09 29.4669368496 -52 35 19.836050460           ~ 4 0
50 HD 155555 RS* 17 17 25.5053342232 -66 57 03.732141636 7.795 7.499 6.723   6.39 G5V+K1V 272 1
51 HD 155555C Y*? 17 17 31.2882831192 -66 57 05.470945380   14.36 12.82 12.33   M3Ve 67 1
52 UCAC4 184-193200 PM* 17 44 42.5695928304 -53 15 47.127733200   15.399 14.068 13.895   ~ 3 0
53 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14396 0
54 2MASS J17483374-5306118 Y*? 17 48 33.7478364840 -53 06 11.855584656   13.76 13.33 13.60 11.03 ~ 9 0
55 HD 164249 PM* 18 03 03.4097283792 -51 38 56.432149872   7.438 7.007 7.90   F6V 120 0
56 HD 164249B PM* 18 03 04.1019089352 -51 38 56.194924920     12.50     M2Ve 22 0
57 RX J1804.2-3018 PM* 18 04 16.1805773664 -30 18 27.961822080       12.291   M1.9 8 0
58 UPM J1805-5704 Y*? 18 05 54.9224700696 -57 04 30.744414660   15.14 13.63 13.30   ~ 9 0
59 2MASS J18092970-5430532 Y*? 18 09 29.7086004864 -54 30 53.270315136           ~ 6 0
60 HD 319139 SB* 18 14 10.4818675368 -32 47 34.516836060   11.47 10.68   9.11 K5+K7 357 0
61 RX J1816.1-5844 Ro* 18 16 12.3798655464 -58 44 05.557949304   14.27 12.74 12.43 10.027 ~ 11 0
62 UCAC4 229-170667 PM* 18 28 16.5093080568 -44 21 47.758777308   15.128 13.507 13.157   ~ 4 0
63 UCAC4 226-179372 Y*? 18 28 35.2382527224 -44 57 28.070753256       11.865   ~ 4 0
64 1RXS J184206.5-555426 PM* 18 42 06.9567394488 -55 54 25.578666072     13.535   10.725 M3.0Ve 25 0
65 2MASS J18430597-4058047 Y*? 18 43 05.9727312360 -40 58 04.829634372           ~ 4 0
66 HD 172555 PM* 18 45 26.9009806435 -64 52 16.534807985   4.967 4.767     A7V 277 0
67 V* PZ Tel BY* 18 53 05.8735056984 -50 10 49.897437168   9.22 8.342   7.464 G9IV 331 0
68 HD 181327 PM* 19 22 58.9437222504 -54 32 16.975668624   7.50 7.04   6.49 F6V 284 0
69 ASAS J192338-4606.4 LM* 19 23 38.2106568240 -46 06 31.644281952     11.871   10.139 M0 26 0
70 2MASS J19243494-3442392 Y*? 19 24 34.9534729320 -34 42 39.365599464   15.878 14.300     M4.0Ve 16 0
71 2MASS J19312434-2134226 PM* 19 31 24.3439051128 -21 34 22.777732632       11.43   M2.4V 16 0
72 UCAC4 314-239934 PM* 19 48 16.5198914496 -27 20 31.937636400   14.633 13.155 12.755   M1.0 6 0
73 UCAC3 116-474938 SB* 19 56 02.9406768936 -32 07 18.658834068   14.79 13.23 12.98   M4 46 0
74 PM J19560-3207 PM* 19 56 04.3718230416 -32 07 37.672684032   12.95 11.589 11.196 10.12 K9IVe 53 0
75 ASAS J200136-3313.0 PM* 20 01 37.1727936768 -33 13 14.010933936   13.846 12.374 11.920 10.214 M1 35 1
76 HD 191089 SB? 20 09 05.2156358688 -26 13 26.520165768   7.62 7.18     F5V 153 0
77 SCR J2010-2801 SB* 20 10 00.0522555265 -28 01 41.038255343   14.49 12.99 12.52 10.09 M3.0Ve 39 0
78 PM J20108-3844 PM* 20 10 50.5476984624 -38 44 32.724118068       12.908   M 5 0
79 SCR J2033-2556 Er* 20 33 37.5959168616 -25 56 52.115241876     14.87 13.44 11.57 M4.5 34 0
80 V* AT Mic Er* 20 41 51.15925 -32 26 06.8283 12.753 11.909 10.343 9.098 7.383 M4.5Ve+M4.5Ve 356 0
81 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1152 0
82 BPS CS 22898-0065 PM* 21 10 05.3573127288 -19 19 57.611503056   13.174 11.750 11.381   M2 43 0
83 StKM 1-1877 PM* 21 18 33.7572866472 +30 14 34.619024220   13.24 11.69 11.154   M1.5Ve 30 0
84 PM J21214-6655 LM* 21 21 28.7195632968 -66 55 06.270466728   11.94 10.595 10.244   K7V 32 0
85 RX J2137.6+0137 ** 21 37 40.1896911245 +01 37 13.502295282   14.91 13.14 13.071 10.439 M4.5V 41 0
86 PM J22187+3321 PM* 22 18 42.6546504864 +33 21 13.685843952     12.950 12.512   M2/M4 12 0
87 CPD-72 2713 Er* 22 42 48.9340258128 -71 42 21.199866948   11.718 10.565 10.401 8.862 K7Ve 64 0
88 V* WW PsA BY* 22 44 57.9628374984 -33 15 01.744541676 14.583 13.627 12.111 10.916 9.109 M4IVe 123 1
89 V* TX PsA Er* 22 45 00.0641595504 -33 15 26.091533124   14.93 13.36 12.095 10.379 M5IVe 80 0
90 PM J22571+3639 PM* 22 57 11.3006798808 +36 39 45.198117108     12.403 11.882   M3 8 0
91 G 68-5 LM* 23 17 28.1434392636 +19 36 47.216769536   13.69   11.627   M2V 62 0
92 G 273-59 LM* 23 30 13.4374314039 -20 23 27.458861538 13.686 12.582 11.108 10.835 8.599 M2Ve 77 0
93 V* AF Psc Er* 23 31 44.9255654328 -02 44 39.537845376   15.7 14.43 13.3   M4.5 56 0
94 2MASS J23433470-3646021 BD* 23 43 34.70640 -36 46 02.1972           L3-L6 9 0
95 G 68-46 PM* 23 51 22.2966320952 +23 44 20.580799416   15.33   13.895   M4.0V 46 0
96 NAME Hercules-Lyra Moving Group MGr ~ ~           ~ 64 0
97 NAME R CrA Association As* ~ ~           ~ 20 0
98 NAME Argus Association As* ~ ~           ~ 228 0

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