2014ApJ...795...70P -
Astrophys. J., 795, 70 (2014/November-1)
Characterization of molecular outflows in the substellar domain.
PHAN-BAO N., LEE C.-F., HO P.T.P., DANG-DUC C. and LI D.
Abstract (from CDS):
We report here our latest search for molecular outflows from young brown dwarfs and very low-mass stars in nearby star-forming regions. We have observed three sources in Taurus with the Submillimeter Array and the Combined Array for Research in Millimeter-wave Astronomy at 230 GHz frequency to search for CO J = 2 ⟶ 1 outflows. We obtain a tentative detection of a redshifted and extended gas lobe at about 10 arcsec from the source GM Tau, a young brown dwarf in Taurus with an estimated mass of 73 MJ, which is right below the hydrogen-burning limit. No blueshifted emission around the brown dwarf position is detected. The redshifted gas lobe that is elongated in the northeast direction suggests a possible bipolar outflow from the source with a position angle of about 36°. Assuming that the redshifted emission is outflow emission from GM Tau, we then estimate a molecular outflow mass in the range from 1.9x10–6 M☉ to 2.9x10–5 M☉and an outflow mass-loss rate from 2.7x10–9 M☉/yr to 4.1x10–8 M☉/yr. These values are comparable to those we have observed in the young brown dwarf ISO-Oph 102 of 60 MJ in ρ Ophiuchi and the very low-mass star MHO 5 of 90 MJin Taurus. Our results suggest that the outflow process in very low-mass objects is episodic with a duration of a few thousand years and the outflow rate of active episodes does not significantly change for different stages of the formation process of very low-mass objects. This may provide us with important implications that clarify the formation process of brown dwarfs.
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Journal keyword(s):
brown dwarfs - ISM: individual: (GM Tau, 2MASS J04141188+2811535, 2MASS J04381486+2611399) - ISM: jets and outflows - stars: formation - stars: low-mass - techniques: interferometric
Simbad objects:
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