Table 1.
New ultracool dwarfs in the Gaia DR2 20 pc sample with SIMBAD identification.
| SIMBAD | RA | DE | Plx | pmRA | pmDE | MG | G − RP | MJ | MH | MKs | Lit.Plx | SIMBAD | Phot. | vtan | Q |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| name | tri/pho | SpT (Ref) | SpT | ||||||||||||
| (°) | (°) | (mas) | (mas yr−1) | (mas yr−1) | (mag) | (mag) | (mag) | (mag) | (mag) | (mas) | (km s−1) | ||||
| LSPM J0025+5422 | 6.314290 | +54.380298 | 59.45 ± 0.12 | −342.74 ± 0.14 | −376.19 ± 0.13 | 14.61 | 1.52 | 10.65 | 10.09 | 9.69 | 68 T (11) | − | M7.5 ± 1.0 (a) | 41 | A |
| 2MASS J01581572+1807128 | 29.565101 | +18.120624 | 50.84 ± 0.18 | −88.20 ± 0.23 | +86.78 ± 0.19 | 14.19 | 1.45 | 10.50 | 9.93 | 9.60 | − | − | M6.5 ± 2.0 (a) | 12 | A |
| LP 889−37B | 62.231268 | −31.482721 | 55.78 ± 0.15 | −19.34 ± 0.20 | −217.40 ± 0.44 | 14.77 | − | − | − | − | 64 T (12) (b) | − | M8.0 ± 1.0 | 19 | E |
| LSPM J0449+5138 | 72.269109 | +51.643140 | 54.39 ± 0.14 | −36.68 ± 0.17 | −373.36 ± 0.13 | 14.61 | 1.51 | 10.50 | 9.78 | 9.42 | 61 T (11) | − | M7.0 ± 1.0 (a) | 33 | A |
| BD+52 911B(c) | 75.856375 | +53.122082 | 72.52 ± 0.18 | +1286.92 ± 0.31 | −1570.93 ± 0.30 | 15.03 | 1.63 | − | − | − | 71 T (13) (b) | - | M8.5 ± 0.5 | 133 | D |
| NLTT 14748(e) | 79.223914 | +56.670247 | 68.83 ± 0.11 | +140.54 ± 0.15 | −408.28 ± 0.14 | 14.23 | 1.47 | 10.35 | 9.76 | 9.38 | 98 T (11) | − | M6.5 ± 1.5 (a) | 30 | A |
| LP 718−5 | 83.840233 | −9.519472 | 52.18 ± 0.13 | +343.89 ± 0.24 | −230.67 ± 0.20 | 14.39 | 1.51 | 10.41 | 9.77 | 9.42 | 52 P (1) | M6.5Ve (1) | M7.0 ± 1.0 (a) | 38 | A |
| LSPM J0540+6417 | 85.094863 | +64.283877 | 57.48 ± 0.20 | −323.87 ± 0.18 | −105.53 ± 0.20 | 16.10 | − | 11.60 | 10.93 | 10.54 | − | − | M9.5 ± 1.0 | 28 | E |
| 2MASS J06320891−1009269 | 98.037603 | −10.158467 | 48.68 ± 0.82 | +98.03 ± 1.37 | −210.37 ± 1.65 | 18.65 | 1.77 | 13.43 | 12.58 | 11.94 | − | − | L5.0 ± 0.5 | 23 | B |
| 2MASS J06431389+1631428 | 100.808283 | +16.528867 | 49.82 ± 0.16 | +112.94 ± 0.28 | +62.30 ± 0.23 | 14.23 | 1.48 | 10.34 | 9.72 | 9.35 | − | − | M6.5 ± 1.0 (a) | 12 | A |
| GJ 283 B | 115.085915 | −17.415063 | 109.05 ± 0.08 | +1152.39 ± 0.11 | −536.55 ± 0.12 | 14.17 | 1.47 | 10.34 | 9.82 | 9.48 | 107 T (14) | M6.5Ve (2) | M6.5 ± 1.5 (a) | 55 | A |
| 2MASS J08334323−5336417 | 128.428118 | −53.609780 | 50.41 ± 0.09 | −256.01 ± 0.20 | +388.87 ± 0.18 | 14.64 | 1.53 | 10.53 | 9.86 | 9.49 | − | − | M7.5 ± 0.5 (a) | 44 | A |
| SCR J0838−5855 | 129.508533 | −58.934257 | 90.04 ± 0.22 | −61.82 ± 0.55 | −317.83 ± 0.41 | 14.18 | 1.54 | 10.08 | 9.48 | 9.04 | 93 T (15) | M6e (3) | M6.5 ± 0.5 (a) | 17 | C |
| LP 788−1 | 142.841347 | −17.295745 | 72.18 ± 0.27 | −367.20 ± 0.35 | −152.13 ± 0.34 | 14.29 | 1.48 | 10.37 | 9.76 | 9.36 | 71 T (15) | M6.5 (4) | M6.5 ± 1.0 (a) | 26 | C |
| LP 848−50 | 160.672533 | −24.267132 | 96.15 ± 0.47 | +40.79 ± 0.77 | +156.58 ± 0.69 | 14.01 | 1.45 | 10.19 | 9.59 | 9.25 | 94 T (15) | − | M6.0 ± 1.5 (a) | 8 | C |
| 2MASS J11155037−6731332 | 168.965807 | −67.526850 | 57.53 ± 0.09 | +534.69 ± 0.17 | −227.09 ± 0.18 | 15.21 | 1.57 | 10.88 | 10.20 | 9.76 | − | − | M8.5 ± 0.5 (a) | 48 | A |
| LP 793−34(d) | 176.398174 | −20.351067 | 51.76 ± 0.10 | +148.82 ± 0.18 | +68.73 ± 0.11 | 14.10 | 1.47 | 10.30 | 9.69 | 9.35 | 50 T (13) (b) | M5e (5) | M6.5 ± 1.5 (a) | 15 | A |
| LP 675−7(e) | 185.965979 | −8.979938 | 52.26 ± 0.12 | −231.61 ± 0.25 | −275.78 ± 0.14 | 14.29 | 1.48 | 10.45 | 9.90 | 9.55 | 52 P (16) | M6.5Ve (1) | M6.5 ± 1.5 (a) | 33 | A |
| LP 911−56 | 206.690122 | −31.823075 | 73.23 ± 0.16 | −343.36 ± 0.23 | +158.62 ± 0.26 | 14.18 | 1.48 | 10.30 | 9.76 | 9.36 | 75 P (17) | M6 (5) | M6.5 ± 1.0 (a) | 24 | A |
| NLTT 37185 | 215.763247 | +51.775978 | 57.70 ± 0.10 | +362.66 ± 0.16 | +193.42 ± 0.14 | 14.69 | 1.52 | 10.69 | 10.11 | 9.76 | 54 T (18) | − | M7.5 ± 1.5 (a) | 34 | A |
| 2MASS J14241870−3514325 | 216.077896 | −35.242757 | 52.39 ± 0.24 | −8.05 ± 0.45 | −76.49 ± 0.32 | 14.41 | 1.50 | 10.44 | 9.79 | 9.40 | 54 P (19) | M6.5 (6) | M7.0 ± 1.0 (a) | 7 | C |
| LHS 2930 | 217.650558 | +59.724252 | 100.29 ± 0.08 | −808.01 ± 0.14 | +157.25 ± 0.13 | 14.87 | 1.53 | 10.80 | 10.15 | 9.79 | 104 T (20) | M6.5V (7) | M7.5 ± 1.0 (a) | 39 | A |
| LP 624−54 | 243.604961 | −2.848627 | 68.70 ± 0.13 | −7.22 ± 0.23 | +367.83 ± 0.13 | 14.43 | 1.50 | 10.49 | 9.87 | 9.46 | 68 P (5) | M5.0V (8) | M7.0 ± 1.0 (a) | 25 | A |
| PM J17189−4131 | 259.726030 | −41.531726 | 88.79 ± 0.18 | −220.05 ± 0.17 | −911.54 ± 0.15 | 14.32 | 1.49 | 10.35 | 9.74 | 9.36 | − | M6 (3) | M6.5 ± 1.0 (a) | 50 | A |
| SIPS J1848−8214(e) | 282.211515 | −82.246211 | 56.93 ± 0.10 | −50.53 ± 0.14 | −272.51 ± 0.20 | 14.38 | 1.51 | 10.26 | 9.70 | 9.28 | 57 T (15) | − | M6.5 ± 1.0 (a) | 23 | A |
| 2MASS J20021341−5425558(e) | 300.556473 | −54.433768 | 55.30 ± 0.11 | +61.13 ± 0.15 | −365.00 ± 0.13 | 14.23 | 1.47 | 10.33 | 9.75 | 9.36 | 58 P (17) | M6e (5) | M6.5 ± 1.5 (a) | 32 | A |
| LP 695−372 | 310.689258 | −5.004822 | 59.64 ± 0.10 | +241.33 ± 0.16 | +117.30 ± 0.11 | 14.08 | 1.46 | 10.33 | 9.75 | 9.42 | 51 P (17) | M6.5 (9) | M6.5 ± 1.5 (a) | 21 | A |
| LSPM J2049+3336 | 312.363261 | +33.612383 | 59.73 ± 0.09 | −207.68 ± 0.13 | −412.07 ± 0.13 | 14.28 | 1.48 | 10.38 | 9.75 | 9.42 | 68 T (11) | − | M6.5 ± 1.5 (a) | 37 | A |
| LP 816−10 | 312.471081 | −17.269443 | 53.39 ± 0.10 | +301.91 ± 0.17 | −98.57 ± 0.11 | 14.41 | 1.49 | 10.45 | 9.85 | 9.44 | 45 P (17) | M6 (10) | M7.0 ± 1.0 (a) | 28 | A |
| 2MASS J21010483+0307047 | 315.274368 | +3.117811 | 54.34 ± 0.16 | +1023.18 ± 0.27 | −55.15 ± 0.26 | 14.56 | 1.54 | 10.38 | 9.64 | 9.24 | 56 T (21) | − | M7.5 ± 1.0 (a) | 89 | A |
| SIPS J2151−4017 | 327.883041 | −40.290912 | 56.11 ± 0.15 | +402.56 ± 0.17 | −265.50 ± 0.18 | 14.16 | 1.49 | 10.19 | 9.51 | 9.16 | − | − | M6.5 ± 1.0 (a) | 41 | A |
Notes. Gaia DR2 coordinates are for (J2000, epoch 2015.5) and were rounded to 0.000001°, parallaxes and their errors to 0.01 mas, proper motions, and their errors to 0.01 mas yr−1. Absolute magnitudes and colours derived from Gaia DR2 and 2MASS data were rounded to 0.01 mag, and tangential velocities to 1 km s−1. Parallaxes from the literature (T = trigonometric, P = photometric, all rounded to 1 mas) and spectral types from SIMBAD are also given, if available. Photometric spectral types were estimated using the relationships between spectral types and absolute magnitudes and colours given by Reylé (2018) using all available data, except for
(G − J not used). Spectral type uncertainties represent standard deviations of the values determined from different relations for a given object.
Companion discovered by Ward-Duong et al. (2015).
Found as common proper motion companion of LP 793−33 = Hip 57361 by Gould & Chanamé (2004).
With non-zero YMG membership probability given in Table 3. Q indicates astrometric and photometric quality (subsamples A−E, see Sect. 2.1).
References. (1) Reid et al. (2003), (2) Davison et al. (2015), (3) Phan-Bao et al. (2017), (4) Rajpurohit et al. (2013), (5) Phan-Bao & Bessell (2006), (6) Cruz et al. (2003), (7) Bessell (1991), (8) Deshpande et al. (2012), (9) Reid et al. (2004), (10) Phan-Bao et al. (2001), (11) Dittmann et al. (2014), (12) Bartlett et al. (2017), (13) Perryman et al. (1997), (14) Costa et al. (2005), (15) Winters et al. (2017), (16) Scholz et al. (2005), (17) Winters et al. (2015), (18) Finch & Zacharias (2016), (19) Cruz et al. (2003), (20) Monet et al. (1992), (21) Jao et al. (2017).
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