Water vapor in the inner 25 au of a young disk around a low-mass protostar
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Water vapor in the inner 25 au of a young disk around a low-mass protostar. / Jørgensen, Jes K.; Van Dishoeck, Ewine F.
I: Astrophysical Journal Letters, Bind 710, Nr. 1 PART 2, 01.01.2010, s. L72-L76.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Water vapor in the inner 25 au of a young disk around a low-mass protostar
AU - Jørgensen, Jes K.
AU - Van Dishoeck, Ewine F.
PY - 2010/1/1
Y1 - 2010/1/1
N2 - Water is one of the key molecules in the physical and chemical evolution of star- and planet-forming regions. We here report the first spatially resolved observation of thermal emission of (an isotopologue of) water with the Plateau de Bure Interferometer toward the deeply embedded Class 0 protostar NGC 1333-IRAS4B. The observations of the H18 2O 3 1,3-22,0 transition at 203.4 GHz resolve the emission of water toward this source with an extent of about 02 corresponding to the inner 25 AU (radius). The H18 2O emission reveals a tentative velocity gradient perpendicular to the extent of the protostellar outflow/jet probed by observations of CO rotational transitions and water masers. The line is narrow, ≈ 1kms-1 (FWHM), significantly less than what would be expected for emission from an infalling envelope or accretion shock, but consistent with emission from a disk seen at a low inclination angle. The water column density inferred from these data suggests that the water emitting gas is a thin warm layer containing about 25 M Earth of material, 0.03% of the total disk mass traced by continuum observations.
AB - Water is one of the key molecules in the physical and chemical evolution of star- and planet-forming regions. We here report the first spatially resolved observation of thermal emission of (an isotopologue of) water with the Plateau de Bure Interferometer toward the deeply embedded Class 0 protostar NGC 1333-IRAS4B. The observations of the H18 2O 3 1,3-22,0 transition at 203.4 GHz resolve the emission of water toward this source with an extent of about 02 corresponding to the inner 25 AU (radius). The H18 2O emission reveals a tentative velocity gradient perpendicular to the extent of the protostellar outflow/jet probed by observations of CO rotational transitions and water masers. The line is narrow, ≈ 1kms-1 (FWHM), significantly less than what would be expected for emission from an infalling envelope or accretion shock, but consistent with emission from a disk seen at a low inclination angle. The water column density inferred from these data suggests that the water emitting gas is a thin warm layer containing about 25 M Earth of material, 0.03% of the total disk mass traced by continuum observations.
KW - Astrochemistry
KW - ISM: abundances
KW - ISM: individual objects (NGC 1333-IRAS4B)
KW - Protoplanetary Disks
KW - Stars: formation
UR - http://www.scopus.com/inward/record.url?scp=77749342972&partnerID=8YFLogxK
U2 - 10.1088/2041-8205/710/1/L72
DO - 10.1088/2041-8205/710/1/L72
M3 - Journal article
AN - SCOPUS:77749342972
VL - 710
SP - L72-L76
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 1 PART 2
ER -
ID: 229737556