Confirmation of the VeLLO L1148-IRS: Star Formation at very low (Column) Density

(2) Argelander Institut fuer Astronomie; (3) Harvard-Smithsonian Center for Astrophysics; (4) Korea Astronomy; (5) Department of Astronomy; California Institute of Technology; C.W. Lee (4); F. Bertoldi (2); Jet Propulsion Laboratory; J. Kauffmann (1); P.C. Myers (3)

arxiv: 1106.2545 · v1 · pith:UAO6RWBHnew · submitted 2011-06-13 · 🌌 astro-ph.SR

Confirmation of the VeLLO L1148-IRS: Star Formation at very low (Column) Density

J. Kauffmann (1) , F. Bertoldi (2) , T.L. Bourke (3) , P.C. Myers (3) , C.W. Lee (4) , T.L. Huard (5) ((1) NPP Fellow , Jet Propulsion Laboratory , California Institute of Technology

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(2) Argelander Institut fuer Astronomie Universitaet Bonn (3) Harvard-Smithsonian Center for Astrophysics (4) Korea Astronomy Space Science Institute (5) Department of Astronomy University of Maryland)

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classification 🌌 astro-ph.SR

keywords l1148-irscorevellocolumndensedensitiesformationl1148

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We report the detection of a compact (of order 5 arcsec; about 1800 AU projected size) CO outflow from L1148-IRS. This confirms that this Spitzer source is physically associated with the nearby (about 325 pc) L1148 dense core. Radiative transfer modeling suggests an internal luminosity of 0.08 to 0.13 L_sun. This validates L1148-IRS as a Very Low Luminosity Object (VeLLO; L < 0.1 L_sun). 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_sun), L1148-IRS and similar VeLLOs might hold some clues about the isolated formation of brown dwarfs.

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Confirmation of the VeLLO L1148-IRS: Star Formation at very low (Column) Density

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