2010ApJ...708..770Q


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.18CEST16:27:32

2010ApJ...708..770Q - Astrophys. J., 708, 770-784 (2010/January-1)

Search for very low-mass brown dwarfs and free-floating planetary-mass objects in Taurus.

QUANZ S.P., GOLDMAN B., HENNING T., BRANDNER W., BURROWS A. and HOFSTETTER L.W.

Abstract (from CDS):

The number of low-mass brown dwarfs and even free floating planetary-mass objects in young nearby star-forming (SF) regions and associations is continuously increasing, offering the possibility to study the low-mass end of the initial mass function in greater detail. In this paper, we present six new candidates for (very) low-mass objects in the Taurus SF region one of which was recently discovered in parallel by Luhman et al. The underlying data we use is part of a new database from a deep near-infrared survey at the Calar Alto observatory. The survey is more than 4 mag deeper than the Two Micron All Sky Survey and covers currently ∼1.5 deg2. Complementary optical photometry from Sloan Digital Sky Survey were available for roughly 1.0 deg2. After selection of the candidates using different color indices, additional photometry from Spitzer/IRAC was included in the analysis. In greater detail, we focus on two very faint objects for which we obtained J-band spectra. Based on comparison with reference spectra, we derive a spectral type of L2±0.5 for one object, making it the object with the latest spectral type in Taurus known today. From models, we find the effective temperature to be 2080±140 K and the mass 5-15 Jupiter masses. For the second source, the J-band spectrum does not provide definite proof of the young, low-mass nature of the object, as the expected steep water vapor absorption at 1.33 µm is not present in the data. We discuss the probability that this object might be a background giant or carbon star. If it were a young Taurus member, however, a comparison to theoretical models suggests that it lies close to or even below the deuterium burning limit (<13 MJup) as well. A first proper motion analysis for both objects shows that they are good candidates for being Taurus members.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: late-type - stars: low-mass, brown dwarfs - stars: pre-main sequence

Nomenclature: Table 5: [QGH2010] CAHA Tau N (Nos 1-6).

Simbad objects: 43

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Number of rows : 43

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 2MASS J02081833+2542533 BD* 02 08 18.3848853893 +25 42 53.188899852           L1V 36 0
2 NAME Sgr Stream St* 02 22 +00.0           ~ 697 0
3 * rho02 Ari LP* 02 55 48.4979998 +18 19 53.902936 8.56 7.44 5.93 3.51 1.34 M6-III: 216 0
4 IC 348 OpC 03 44 34 +32 09.8           ~ 1255 1
5 [SS94] V410 X-ray 3 TT* 04 18 07.9726935315 +28 26 03.673508581     18.319     M6 65 0
6 IRAS 04154+2823 Y*O 04 18 32.0460600618 +28 31 14.990027099           M2.5 60 0
7 2MASS J04194657+2712552 Y*O 04 19 46.57464 +27 12 55.2096           M7.5 20 0
8 [MDM2001] CFHT-BD-Tau 19 Y*O 04 21 07.9716728277 +27 02 20.095089359           M5IVe 34 0
9 2MASS J04215450+2652315 TT* 04 21 54.5256903324 +26 52 31.353073628           M8.5 27 0
10 V* FU Tau Or* 04 23 35.3912144972 +25 03 02.741853087           M7.25 59 0
11 V* FU Tau B BD* 04 23 35.73792 +25 02 59.6328       22.16 19.11 L0.3 32 0
12 2MASS J04242090+2630511 Y*O 04 24 20.8977757596 +26 30 51.064923798           M6.5 27 0
13 2MASS J04263055+2443558 BD* 04 26 30.5575174268 +24 43 55.835559684           L0.6 24 0
14 [BLH2002] KPNO-Tau 4 BD* 04 27 27.9997171623 +26 12 05.097974406     24.722 20.54 18.75 L0 66 0
15 2MASS J04295950+2433078 TT* 04 29 59.5081451509 +24 33 07.687799554     16.31 17.9 15.7 M5.5 41 0
16 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1253 0
17 [QGH2010] CAHA Tau 1 BD* 04 36 09.00 +24 08 21.2       22.89 20.00 L2 2 0
18 [QGH2010] CAHA Tau 2 LM* 04 39 47.20 +25 53 32.2       21.92 19.16 ~ 2 0
19 [QGH2010] CAHA Tau 3 LM* 04 40 39.30 +25 23 02.0       23.16 20.47 ~ 2 0
20 [QGH2010] CAHA Tau 4 LM* 04 40 57.40 +25 50 07.9       22.78 19.63 ~ 2 0
21 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3697 0
22 ITG 33A TT* 04 41 08.2613426749 +25 56 07.368386155           M3 40 0
23 [QGH2010] CAHA Tau 5 LM* 04 41 31.60 +25 49 32.2       19.82 17.87 ~ 2 0
24 V* V1061 Tau EB* 04 58 52.7544046795 +24 29 44.558363790   8.28 8.03     OB 30 0
25 HD 33090 * 05 08 46.6188727694 +21 29 44.344681122   8.52 8.36     B5 20 0
26 HD 36981 * 05 35 06.1983934025 -05 12 15.915795682 7.16 7.76 7.89     B7III/IV 84 0
27 [BZR99] S Ori 70 BD* 05 38 10.10 -02 36 26.0           T6-7 46 0
28 [BZR99] S Ori 47 BD* 05 38 14.62416 -02 40 15.4020         20.53 L1e 28 0
29 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 502 0
30 [BZR99] S Ori 72 * 05 38 59.17 -02 35 26.0           ~ 4 0
31 DENIS J104814.6-395606 LM* 10 48 14.5734267094 -39 56 06.843210566     17.532 15.051 12.67 M8.5Ve: 116 0
32 NAME TW Hya Association As* 11 01.9 -34 42           ~ 843 0
33 V* BK Vir AB* 12 30 21.0150535628 +04 24 59.159360514 9.60 8.82 7.28     M7-III: 136 0
34 NAME Kelu-1 BD* 13 05 40.1737206066 -25 41 05.830344467         16.85 L2+L3.5 239 0
35 * 87 Vir PM* 13 47 25.3915118774 -17 51 35.432896577 8.99 7.05 5.43     M2III 67 0
36 2MASSW J1506544+132106 BD* 15 06 54.3298685056 +13 21 06.041740524           L3 85 0
37 NAME Upper Sco Association As* 16 12 -23.4           ~ 1097 1
38 V* EU Del LP* 20 37 54.7272555845 +18 16 06.874014451 8.42 7.38 5.89 3.24 0.97 M6III 167 0
39 * 2 Peg * 21 29 56.8954513 +23 38 19.817036   6.088 4.509     M1+III 103 0
40 V* EP Aqr AB* 21 46 31.8467491729 -02 12 45.901666975   7.93 6.78     M7-III: 220 0
41 HD 213893 PM* 22 34 35.9388157139 +00 35 42.640914978   8.27 6.73     M0IIIb 54 0
42 V* MY Cep s*r 22 54 31.6975860144 +60 49 38.970114015           M7.5I 80 0
43 * 8 And V* 23 17 44.6457610150 +49 00 55.087878455 8.50 6.53 4.86 3.40 2.14 M2.5IIIBa0.5 103 0

    Equat.    Gal    SGal    Ecl

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2021.05.18-16:27:33

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