A substellar-mass protostar and its outflow of IRAS 15398-3359 revealed by subarcsecond-resolution observations of H2CO and CCH

Yoko Oya; Nami Sakai; Takeshi Sakai; Yoshimasa Watanabe; Tomoya Hirota; Johan Lindberg; Suzanne Elisabeth Bisschop; Jes Kristian Jørgensen; Ewine F. van Dishoeck; Satoshi Yamamoto

doi:10.1088/0004-637X/795/2/152

A substellar-mass protostar and its outflow of IRAS 15398-3359 revealed by subarcsecond-resolution observations of H₂CO and CCH

Yoko Oya, Nami Sakai, Takeshi Sakai, Yoshimasa Watanabe, Tomoya Hirota, Johan Lindberg, Suzanne Elisabeth Bisschop, Jes Kristian Jørgensen, Ewine F. van Dishoeck, Satoshi Yamamoto

Astrophysics and Planetary Science

39 Citations (Scopus)

Abstract

Subarcsecond (0.''5) images of H₂CO and CCH line emission have been obtained in the 0.8 mm band toward the low-mass protostar IRAS 15398–3359 in the Lupus 1 cloud as one of the Cycle 0 projects of the Atacama Large Millimeter/Submillimeter Array. We have detected a compact component concentrated in the vicinity of the protostar and a well-collimated outflow cavity extending along the northeast-southwest axis. The inclination angle of the outflow is found to be about 20°, or almost edge-on, based on the kinematic structure of the outflow cavity. This is in contrast to previous suggestions of a more pole-on geometry. The centrally concentrated component is interpreted by use of a model of the infalling rotating envelope with the estimated inclination angle and the mass of the protostar is estimated to be less than 0.09 M _☉. Higher spatial resolution data are needed to infer the presence of a rotationally supported disk for this source, hinted at by a weak high-velocity H₂CO emission associated with the protostar.

Original language	English
Article number	152
Journal	Astrophysical Journal
Volume	795
Issue number	2
Number of pages	9
ISSN	0004-637X
DOIs	https://doi.org/10.1088/0004-637X/795/2/152
Publication status	Published - 10 Nov 2014

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10.1088/0004-637X/795/2/152

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@article{5afef82104e04878ab209bbfd7863ab9,

title = "A substellar-mass protostar and its outflow of IRAS 15398-3359 revealed by subarcsecond-resolution observations of H2CO and CCH",

abstract = "Subarcsecond (0.''5) images of H2CO and CCH line emission have been obtained in the 0.8 mm band toward the low-mass protostar IRAS 15398–3359 in the Lupus 1 cloud as one of the Cycle 0 projects of the Atacama Large Millimeter/Submillimeter Array. We have detected a compact component concentrated in the vicinity of the protostar and a well-collimated outflow cavity extending along the northeast-southwest axis. The inclination angle of the outflow is found to be about 20°, or almost edge-on, based on the kinematic structure of the outflow cavity. This is in contrast to previous suggestions of a more pole-on geometry. The centrally concentrated component is interpreted by use of a model of the infalling rotating envelope with the estimated inclination angle and the mass of the protostar is estimated to be less than 0.09 M ☉. Higher spatial resolution data are needed to infer the presence of a rotationally supported disk for this source, hinted at by a weak high-velocity H2CO emission associated with the protostar.",

author = "Yoko Oya and Nami Sakai and Takeshi Sakai and Yoshimasa Watanabe and Tomoya Hirota and Johan Lindberg and Bisschop, {Suzanne Elisabeth} and J{\o}rgensen, {Jes Kristian} and {van Dishoeck}, {Ewine F.} and Satoshi Yamamoto",

year = "2014",

month = nov,

day = "10",

doi = "10.1088/0004-637X/795/2/152",

language = "English",

volume = "795",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - A substellar-mass protostar and its outflow of IRAS 15398-3359 revealed by subarcsecond-resolution observations of H2CO and CCH

AU - Oya, Yoko

AU - Sakai, Nami

AU - Sakai, Takeshi

AU - Watanabe, Yoshimasa

AU - Hirota, Tomoya

AU - Lindberg, Johan

AU - Bisschop, Suzanne Elisabeth

AU - Jørgensen, Jes Kristian

AU - van Dishoeck, Ewine F.

AU - Yamamoto, Satoshi

PY - 2014/11/10

Y1 - 2014/11/10

N2 - Subarcsecond (0.''5) images of H2CO and CCH line emission have been obtained in the 0.8 mm band toward the low-mass protostar IRAS 15398–3359 in the Lupus 1 cloud as one of the Cycle 0 projects of the Atacama Large Millimeter/Submillimeter Array. We have detected a compact component concentrated in the vicinity of the protostar and a well-collimated outflow cavity extending along the northeast-southwest axis. The inclination angle of the outflow is found to be about 20°, or almost edge-on, based on the kinematic structure of the outflow cavity. This is in contrast to previous suggestions of a more pole-on geometry. The centrally concentrated component is interpreted by use of a model of the infalling rotating envelope with the estimated inclination angle and the mass of the protostar is estimated to be less than 0.09 M ☉. Higher spatial resolution data are needed to infer the presence of a rotationally supported disk for this source, hinted at by a weak high-velocity H2CO emission associated with the protostar.

AB - Subarcsecond (0.''5) images of H2CO and CCH line emission have been obtained in the 0.8 mm band toward the low-mass protostar IRAS 15398–3359 in the Lupus 1 cloud as one of the Cycle 0 projects of the Atacama Large Millimeter/Submillimeter Array. We have detected a compact component concentrated in the vicinity of the protostar and a well-collimated outflow cavity extending along the northeast-southwest axis. The inclination angle of the outflow is found to be about 20°, or almost edge-on, based on the kinematic structure of the outflow cavity. This is in contrast to previous suggestions of a more pole-on geometry. The centrally concentrated component is interpreted by use of a model of the infalling rotating envelope with the estimated inclination angle and the mass of the protostar is estimated to be less than 0.09 M ☉. Higher spatial resolution data are needed to infer the presence of a rotationally supported disk for this source, hinted at by a weak high-velocity H2CO emission associated with the protostar.

U2 - 10.1088/0004-637X/795/2/152

DO - 10.1088/0004-637X/795/2/152

M3 - Journal article

SN - 0004-637X

VL - 795

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 152

ER -