J/ApJ/773/168 Submm fluxes of very low-mass stars and BDs (Mohanty+, 2013)
Protoplanetary disk masses from stars to brown dwarfs.
Mohanty S., Greaves J., Mortlock D., Pascucci I., Scholz A., Thompson M.,
Apai D., Lodato G., Looper D.
<Astrophys. J., 773, 168 (2013)>
=2013ApJ...773..168M 2013ApJ...773..168M
ADC_Keywords: Millimetric/submm sources ; Stars, masses ; Stars, distances ;
Spectral types ; YSOs
Keywords: brown dwarfs; protoplanetary disks; stars: formation;
stars: pre-main sequence; stars: variables: T Tauri, Herbig Ae/Be;
submillimeter: stars
Abstract:
We present SCUBA-2 850µm observations of seven very low mass stars
(VLMS) and brown dwarfs (BDs). Three are in Taurus and four in the TW
Hydrae Association (TWA), and all are classical T Tauri (cTT) analogs.
We detect two of the three Taurus disks (one only marginally), but
none of the TWA ones. For standard grains in cTT disks, our 3σ
limits correspond to a dust mass of 1.2M⊕ in Taurus and a mere
0.2M⊕ in the TWA (3-10x deeper than previous work). We combine
our data with other submillimeter/millimeter (sub-mm/mm) surveys of
Taurus, ρ Oph, and the TWA to investigate the trends in disk mass
and grain growth during the cTT phase.
Description:
We were awarded 10hr of shared-risk (first light) time on JCMT/SCUBA-2
to investigate primordial disks around very low mass stars (VLMS) and
brown dwarfs (BDs) at 850um.
Our combined sample (SCUBA-2 observations complemented by most of the
Taurus, ρ Oph, and TWA Class II and/or cTT analogs (i.e.,
optically revealed accretors) observed in the sub-mm/mm (850um and/or
1.3mm) so far) consists of 134 objects -48 in ρ Oph, 80 in Taurus,
and 6 in the TWA- spanning masses of ∼15MJ to 4M☉.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 124 134 Sub-mm/mm fluxes, binarity, and derived properties
for class II/cTTs in ρ Oph, Taurus, and the TWA
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See also:
J/ApJ/771/129 : Submillimetric Class II sources of Taurus (Andrews+, 2013)
J/ApJ/751/115 : Millimeter emission from Taurus binary systems (Harris+, 2012)
J/ApJ/731/8 : Multiple star formation in Taurus-Auriga (Kraus+, 2011)
J/A+A/515/A75 : Low-mass stars in ρ Oph cloud (Alves de Oliveira+, 2010)
J/ApJ/720/480 : DISCS. I. Taurus protoplanetary disk data (Oberg+, 2010)
J/ApJ/671/1800 : SCUBA observations of ρ Oph cloud (Andrews+, 2007)
J/A+A/452/245 : Near-IR photometry of PMS stars in rho Oph (Natta+, 2006)
J/A+A/447/609 : 1.2mm continuum observations in rho Oph cloud (Stanke+, 2006)
J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)
J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- f_ID [*,d] Source observed here, or binary (1)
3- 15 A13 --- ID Source identifier
17- 21 A5 --- SpT MK spectral type
23- 26 I4 K Teff [2400/9520] Effective temperature
28- 32 F5.3 Msun M* [0.01/3.8] Stellar mass
34 A1 --- l_F850 3σ upper limit flag on F850
36- 43 F8.3 mJy F850 [-1/1450]? Mesured 850um flux
45- 50 F6.2 mJy e_F850 [0.7/310]? 1σ error on F850
52 A1 --- l_F1300 3σ upper limit flag on F1300
54- 59 F6.2 mJy F1300 ? Measured 1.3mm flux
60 A1 --- f_F1300 [h] Flag on F1300 (2)
62- 66 F5.2 mJy e_F1300 [0.6/54]? 1σ error on F1300
68 A1 --- l_alpha Limit flag on alpha
70- 74 F5.2 --- alpha [-3.4/5.3]? 850um-1.3mm index (α) (3)
76- 79 F4.2 --- e_alpha [0.06/0.9]? alpha uncertainty
81 A1 --- l_Md Limit flag on Md
83- 89 E7.3 MJup Md [-0.2/72.5] Apparent disk mass (4)
91- 96 F6.4 MJup e_Md [0.008/7.1]? 1σ error on Md
98-104 A7 --- Reg Region: Taurun, rho Oph or TWA (TW Hydrae)
106-110 F5.1 pc Dist [42/150] Distance
112 I1 --- r_F850 ? F850 reference (5)
114 I1 --- r_F1300 ? F1300 reference (5)
116-120 A5 --- Mult Multiplicity (6)
122-124 A3 --- r_Mult Reference for multiplicity information (7)
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Note (1): Flag as follows:
* = sources observed in this paper, at 850um, on SCUBA-2.
d = sources with more binarity information in footnote 21 of the paper.
Note (2):
h = For TW Hya, this is the flux (and 1σ error) at 1.1mm (Weintraub
et al. 1989ApJ...340L..69W 1989ApJ...340L..69W); we have cited it here for completeness,
since close to 1.3mm.
Note (3): Measured values of α with 1σ error bars, or 3σ upper
or lower limits. See Equation (8) and discussion in Section 5.
Note (4): Md,[850] if either a measured value of the 850um flux is available,
or the upper limit on Md,[850] is smaller than the upper limit on
Md,[1300]; otherwise Md,[1300]. Computed using Equation (9).
These are the values used in our Bayesian analysis.
Note (5): Reference as follows:
1 = AW07a (Andrews+, 2007, J/ApJ/671/1800), and references therein;
2 = AW05 (Andrews & Williams, 2005ApJ...631.1134A 2005ApJ...631.1134A), and references therein;
3 = Klein et al. 2003ApJ...593L..57K 2003ApJ...593L..57K;
4 = Scholz et al. 2006ApJ...645.1498S 2006ApJ...645.1498S;
5 = This study (these sources are also marked with an asterisk);
6 = Schaefer et al. 2009ApJ...701..698S 2009ApJ...701..698S;
7 = Zuckerman B. 2001ARA&A..39..549Z 2001ARA&A..39..549Z;
8 = Weintraub et al. 1989ApJ...340L..69W 1989ApJ...340L..69W
Note (6): Multiplicity code as follows:
c = close binary (sep <100AU),
w = wide binary (sep ≥100AU),
sb = spectroscopic binary,
m = multiple.
Note (7): Reference as follows:
1 = R10a (Ricci et al. 2010A&A...521A..66R 2010A&A...521A..66R), and references therein;
2 = Reipurth & Zinnecker 1993A&A...278...81R 1993A&A...278...81R;
3 = AW05 (Andrews & Williams, 2005ApJ...631.1134A 2005ApJ...631.1134A), and references therein;
4 = Kraus et al. 2011, J/ApJ/731/8, and references therein;
5 = Chauvin et al. 2005A&A...438L..25C 2005A&A...438L..25C;
6 = Andrews et al. 2010ApJ...710..462A 2010ApJ...710..462A, and references therein;
7 = Looper et al. 2010AJ....140.1486L 2010AJ....140.1486L
See also footnote 21 in the main text, for sources IDs marked with d.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 23-Feb-2015