Journal Article

Confirmation of the VeLLO L1148−IRS: star formation at very low (column) density*

J. Kauffmann, F. Bertoldi, T. L. Bourke, P. C. Myers, C. W. Lee and T. L. Huard

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 416, issue 3, pages 2341-2358
Published in print September 2011 | ISSN: 0035-8711
Published online September 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19205.x
Confirmation of the VeLLO L1148−IRS: star formation at very low (column) density*

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We report the detection of a compact (∼5 arcsec; about 1800 au projected size) CO outflow from L1148−IRS. This confirms that this Spitzer source is physically associated with the nearby (≈325 pc) L1148 dense core. Radiative transfer modelling suggests an internal luminosity of 0.08 to 0.13 L. This validates L1148−IRS as a Very Low Luminosity Object (VeLLO; L≤ 0.1 L). The L1148 dense core has unusually low densities and column densities for a star-forming core. It is difficult to understand how L1148−IRS might have formed under these conditions. Independent of the exact final mass of this VeLLO (which is likely <0.24 M), L1148−IRS and similar VeLLOs might hold some clues about the isolated formation of brown dwarfs.

Keywords: brown dwarfs; stars: formation; stars: low-mass; ISM: individual objects: L1148; ISM: jets and outflows; infrared: stars

Journal Article.  15140 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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