SIMBAD references

2011ApJ...735...14P - Astrophys. J., 735, 14 (2011/July-1)

Molecular outflows in the substellar domain: millimeter observations of young very low mass objects in Taurus and ρ Ophiuchi.

PHAN-BAO N., LEE C.-F., HO P.T.P. and TANG Y.-W.

Abstract (from CDS):

We report here our search for molecular outflows from young very low mass stars and brown dwarfs in Taurus and ρ Ophiuchi. Using the Submillimeter Array and the Combined Array for Research in Millimeter-wave Astronomy, we have observed four targets at 1.3 mm wavelength (230 GHz) to search for CO J = 2 ⟶ 1 outflows. A young very low mass star MHO 5 (in Taurus) with an estimated mass of 90 MJ, which is just above the hydrogen-burning limit, shows two gas lobes that are likely outflows. While the CO map of MHO 5 does not show a clear structure of outflow, possibly due to environment gas, its position-velocity diagram indicates two distinct blue- and redshifted components. We therefore conclude that they are components of a bipolar molecular outflow from MHO 5. We estimate an outflow mass of 7.0x10–5 M☉ and a mass-loss rate of 9.0x10–10 M☉. These values are over two orders of magnitude smaller than the typical ones for T Tauri stars and somewhat weaker than those we have observed in the young brown dwarf ISO-Oph 102 of 60 MJ in ρ Ophiuchi. This makes MHO 5 the first young very low mass star showing a bipolar molecular outflow in Taurus. The detection boosts the scenario that very low mass objects form like low-mass stars but in a version scaled down by a factor of over 100.

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Journal keyword(s): brown dwarfs - ISM: jets and outflows - stars: low-mass

Simbad objects: 16

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