Journal
SCIENCE
Volume 337, Issue 6090, Pages 69-72Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1222602
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- Institut National des Sciences de l'Univers/CNRS (France)
- Max-Planck-Gesellschaft (Germany)
- Instituto Geografico Nacional (Spain)
- STFC [ST/G001987/1, ST/J001651/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J001651/1, ST/G001987/1] Funding Source: researchfish
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It is not known whether brown dwarfs [stellar-like objects with masses less than the hydrogen-burning limit, 0.075 solar mass (M.)] are formed in the same way as solar-type stars or by some other process. Here we report the clear-cut identification of a self-gravitating condensation of gas and dust with a mass in the brown-dwarf regime, made through millimeter interferometric observations. The level of thermal millimeter continuum emission detected from this object indicates a mass similar to 0.02 to 0.03 M-circle dot, whereas the small radius, <460 astronomical units, and narrow spectral lines imply a dynamical mass of 0.015 to 0.02 M-circle dot. The identification of such a pre-brown dwarf core supports models according to which brown dwarfs are formed in the same manner as hydrogen-burning stars.
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