2013A&A...552L...2G


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.10CET20:02:29

2013A&A...552L...2G - Astronomy and Astrophysics, volume 552, L2-2 (2013/4-1)

Spatially resolved H2 emission from a very low-mass star.

GARCIA LOPEZ R., CARATTI O GARATTI A., WEIGELT G., NISINI B. and ANTONIUCCI S.

Abstract (from CDS):

Molecular outflows from very low-mass stars (VLMSs) and brown dwarfs have been studied very little. So far, only a few CO outflows have been observed, allowing us to map the immediate circumstellar environment. We present the first spatially resolved H2 emission around IRS54 (YLW52), a ∼0.1-0.2M Class I source. By means of VLT SINFONI K-band observations, we probed the H2 emission down to the first ∼50AU from the source. The molecular emission shows a complex structure delineating a large outflow cavity and an asymmetric molecular jet. Thanks to the detection of several H2 transitions, we are able to estimate average values along the jet-like structure (from source position to knot D) of AV∼28mag, T∼2000-3000K, and H2 column density N(H2)∼1.7x1017cm–2. This allows us to estimate a mass loss rate of ∼2x10–10M/yr for the warm H2 component. In addition, from the total flux of the Brγ line, we infer an accretion luminosity and mass accretion rate of 0.64L and ∼3x10–7M/yr, respectively. The outflow structure is similar to those found in low-mass Class I and CTTS. However, the Lacc/Lbol ratio is very high (∼80%), and the mass accretion rate is about one order of magnitude higher when compared to objects of roughly the same mass, pointing to the young nature of the investigated source.

Abstract Copyright:

Journal keyword(s): stars: formation - circumstellar matter - stars: winds, outflows - ISM: jets and outflows - infrared: ISM

VizieR on-line data: <Available at CDS (J/A+A/552/L2): list.dat fits/*>

CDS comments: Table 1 Knots not in Simbad.

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* RW Aur TT* 05 07 49.538 +30 24 05.07   10.86 9.60 9.95   K1/5e+K5e 696 0
2 [K2003d] rho Oph D1 PoC 16 27 43.0 -24 31 57           ~ 5 0
3 [KGS2004] f08-01b ? 16 27 51.2 -24 31 46           ~ 3 0
4 [KGS2004] f08-01c ? 16 27 51.5 -24 31 50           ~ 3 0
5 YLW 52 Y*O 16 27 51.80472 -24 31 45.5304           ~ 60 0
6 [KGS2004] f08-01d ? 16 27 52.4 -24 31 45           ~ 2 0
7 MHO 2130 EmO 16 27 58.2 -24 31 26           ~ 2 0
8 [K2003d] rho Oph D2 PoC 16 27 58.2 -24 31 26           ~ 3 0
9 [KGS2004] f08-01f ? 16 27 59.2 -24 31 32           ~ 3 0
10 [K2003d] rho Oph D3 PoC 16 28 03.8 -24 30 54           ~ 4 0
11 MHO 2131 EmO 16 28 03.8 -24 30 53           ~ 2 0
12 [KGS2004] f08-01h IR 16 28 05.2 -24 30 39           ~ 4 0
13 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2944 0

    Equat.    Gal    SGal    Ecl

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2019.12.10-20:02:29

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