2017ApJS..231...15D


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET22:53:04

2017ApJS..231...15D - Astrophys. J., Suppl. Ser., 231, 15-15 (2017/August-0)

Individual dynamical masses of ultracool dwarfs.

DUPUY T.J. and LIU M.C.

Abstract (from CDS):

We present the full results of our decade-long astrometric monitoring programs targeting 31 ultracool binaries with component spectral types M7-T5. Joint analysis of resolved imaging from Keck Observatory and Hubble Space Telescope and unresolved astrometry from CFHT/WIRCam yields parallactic distances for all systems, robust orbit determinations for 23 systems, and photocenter orbits for 19 systems. As a result, we measure 38 precise individual masses spanning 30-115 MJup. We determine a model-independent substellar boundary that is ≃70 MJup in mass (≃L4 in spectral type), and we validate Baraffe et al. evolutionary model predictions for the lithium-depletion boundary (60 MJup at field ages). Assuming each binary is coeval, we test models of the substellar mass-luminosity relation and find that in the L/T transition, only the Saumon & Marley "hybrid" models accounting for cloud clearing match our data. We derive a precise, mass-calibrated spectral type-effective temperature relation covering 1100-2800 K. Our masses enable a novel direct determination of the age distribution of field brown dwarfs spanning L4-T5 and 30-70 MJup. We determine a median age of 1.3 Gyr, and our population synthesis modeling indicates our sample is consistent with a constant star formation history modulated by dynamical heating in the Galactic disk. We discover two triple-brown-dwarf systems, the first with directly measured masses and eccentricities. We examine the eccentricity distribution, carefully considering biases and completeness, and find that low-eccentricity orbits are significantly more common among ultracool binaries than solar-type binaries, possibly indicating the early influence of long-lived dissipative gas disks. Overall, this work represents a major advance in the empirical view of very low-mass stars and brown dwarfs.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrometry - binaries: close - brown dwarfs - fundamental parameters - parallaxes - stars: evolution - stars: evolution

VizieR on-line data: <Available at CDS (J/ApJS/231/15): table1.dat table2.dat table3.dat table4.dat table5.dat table9.dat table10.dat table11.dat table13.dat refs.dat>

Simbad objects: 63

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Number of rows : 63

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 L 362-29 B BD* 00 04 34.8641153471 -40 44 06.464450691       19.61 16.88 L5+L5 95 0
2 LP 881-64 ** 00 24 44.220360 -27 08 25.04904   17.18 15.338 13.502 11.403 M5.5/6Ve+M8.5Ve 120 0
3 LP 349-25 LM* 00 27 55.98816 +22 19 32.8008   18.6   16.0   M8Ve 62 0
4 DENIS J020529.0-115925 BD* 02 05 29.40072 -11 59 29.6736           L7V 139 0
5 2MASS J03572695-4417305 BD* 03 57 26.9620991711 -44 17 30.499748423         17.86 L0beta 29 0
6 LP 415-20 LM* 04 21 49.5662427321 +19 29 08.606438926           M7+M9.5 33 0
7 2MASSI J0423485-041403 BD* 04 23 48.5838371891 -04 14 03.228116841           L6.5+T2 107 0
8 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2714 0
9 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3575 0
10 2MASS J04414565+2301580 TT* 04 41 45.6493974957 +23 01 58.016822466   16.67 15.20 14.87   M4.3 29 1
11 2MASS J05185995-2828372 BD* 05 18 59.95656 -28 28 37.2720           L6+T4 32 0
12 2MASS J05233822-1403022 BD* 05 23 38.2238597336 -14 03 02.008934344           L2.5 52 0
13 V* AB Dor C LM* 05 28 44.83 -65 26 54.9           M8: 61 0
14 V* AB Dor TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 939 0
15 2MASS J05591914-1404488 BD* 05 59 19.1884616785 -14 04 49.215388622           T4.5 134 0
16 2MASS J07003664+3157266 BD* 07 00 36.7166853497 +31 57 25.503841463           L3+L6.5 32 0
17 LP 206-11 ** 07 11 11.518536 +43 29 56.66532   16.7 15.90 15.746 11.92 M5.5V 33 0
18 LSPM J0746+2000 BD* 07 46 42.49536 +20 00 32.6124       17.9 15.034 L0+L1.5 172 1
19 2MASS J08381155+1511155 BD? 08 38 11.55336 +15 11 15.5112           ~ 7 0
20 LP 486-16 ** 08 50 19.149960 +10 56 43.50408   17.64 15.92 15.25   M5e+M6e 14 0
21 2MASS J08503593+1057156 BD* 08 50 35.93400 +10 57 15.6168       22.466 20.349 L6.5+L8.5 69 0
22 2MASS J08564793+2235182 BD* 08 56 47.93808 +22 35 18.2040           L3 16 0
23 2MASSW J0920122+351742 BD* 09 20 12.23664 +35 17 42.9684           L5.5+L9 42 0
24 2MASS J09261537+5847212 BD* 09 26 15.37752 +58 47 21.2280           T3.5+T5 29 0
25 2MASS J10042824-1146489 ** 10 04 28.2256458705 -11 46 49.015314646         18.021 ~ 6 2
26 2MASS J10170754+1308398 BD* 10 17 07.5511495626 +13 08 39.830791045         17.418 L1.5+L3 27 0
27 2MASS J10210969-0304197 BD* 10 21 09.69240 -03 04 19.7904           T1+T4 67 0
28 LP 213-67 PM* 10 47 12.6093653326 +40 26 43.728916506   19.2       M6.5Ve 33 1
29 LP 213-68 ** 10 47 13.7773543561 +40 26 49.271483418   21.2   19.1   M8+L0 30 0
30 NAME Luhman 16B BD* 10 49 18.9 -53 19 09           T0.5 37 0
31 2MASS J10521350+4422559 BD* 10 52 13.50504 +44 22 55.9128           L6.5+T1.5 27 0
32 HD 97334B BD* 11 12 25.6347484565 +35 48 12.777435627           L4.5+L6 67 0
33 HD 97334 BY* 11 12 32.3505448605 +35 48 50.691547084   7.02   6.0   G2 257 0
34 LP 732-94 LM* 11 21 49.1720839605 -13 13 08.728765179     19.57     M8.5V 123 0
35 DENIS J122815.2-154733 BD* 12 28 15.23184 -15 47 34.2312       20.187 18.163 L5.5+L5.5 136 0
36 2MASSW J1239272+551537 BD* 12 39 27.27288 +55 15 37.1628           L5V 34 0
37 VHS J1256-1257 LM* 12 56 02.15136 -12 57 21.7116     17.759   13.318 M7.0 30 0
38 NAME Kelu-1 BD* 13 05 40.1737206066 -25 41 05.830344467         16.85 L2+L3.5 238 0
39 LP 497-33 ** 13 14 20.376648 +13 20 01.00608   16.8 15.83 14.9 11.94 M6.0V 60 0
40 2MASS J14044948-3159330 BD* 14 04 49.48416 -31 59 33.0576           T1+T5 29 1
41 2MASSI J1426316+155701 LM* 14 26 31.6111849008 +15 57 01.045067058       18.320 15.819 M9V 27 0
42 2MASS J14304358+2915405 BD* 14 30 43.5725799866 +29 15 40.727170625           L1.5V 15 0
43 HD 130948 BY* 14 50 15.8107686483 +23 54 42.633203114   6.456 5.867     F9IV-V 254 0
44 NAME HD 130948BC BD* 14 50 16.00 +23 54 41.8           L4+L4 55 0
45 BD+16 2708 Er* 14 54 29.2359453437 +16 06 03.798840236 12.86 11.686 10.150 9.116 7.872 M3V 247 1
46 BD+16 2708B SB* 14 54 29.4185719182 +16 06 08.616294953           M8.5 131 0
47 2MASS J15341711+1615463 BD* 15 34 17.11008 +16 15 46.3680           T1.5+T5.5 18 0
48 2MASSI J1534498-295227 BD* 15 34 49.84080 -29 52 27.4188           T4.5+T5 59 0
49 ** ALP 22 ** 17 28 11.50 +39 48 59.3           ~ 3 0
50 2MASSW J1728114+394859 BD* 17 28 11.50056 +39 48 59.3100           L5+L6.5 52 0
51 LP 388-55 LM* 17 35 12.86616 +26 34 49.5732   20.1   18.1   M7.5+L0 15 0
52 LSPM J1750+4424 LM* 17 50 12.9039110553 +44 24 04.244541013   21.0   18.8   M6.5+M8.5 19 0
53 SCR J1845-6357 LM* 18 45 05.2506866871 -63 57 47.458544682     17.40 14.99 12.46 M8.5V 59 1
54 2MASSI J1847034+552243 SB* 18 47 03.43152 +55 22 43.5216   18.7   16.4   M6+M7 12 0
55 HD 354613 * 20 03 55.1763678367 +17 05 03.964073591   10.58 9.37     K2 2 0
56 Wolf 1084 SB* 20 43 19.2534162835 +55 20 53.541561877   16.46   13.9   M5Ve 77 0
57 SDSS J205235.31-160929.8 BD* 20 52 35.31672 -16 09 29.8620           L8.5+T1.5 17 0
58 2MASS J21321145+1341584 BD* 21 32 11.45376 +13 41 58.4124           L4.5+L8.5 18 0
59 2MASS J21402931+1625183 ** 21 40 29.3210817966 +16 25 18.154294077         15.36 M8+M9.5 25 0
60 2MASSW J2206228-204705 SB* 22 06 22.80192 -20 47 05.8956     19.788 17.452 14.877 M8.0V 43 0
61 2MASS J22521073-1730134 BD* 22 52 10.7502089068 -17 30 13.928785116         17.9 L4.5+T3.5 44 0
62 Cl King 10 OpC 22 55 01 +59 10.2           ~ 30 0
63 SIPS J2255-5713 BD* 22 55 18.6002963228 -57 13 06.264206714       20.58   L6:+L8 14 0

    Equat.    Gal    SGal    Ecl

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2020.11.30-22:53:04

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