A Substellar-Mass Protostar and its Outflow of IRAS 15398-3359 Revealed by Subarcsecond-Resolution Observations of H${}_2$CO and CCH

Abstract

Sub-arcsecond ($0{.}^{\prime \prime }5$) images of H${}_2$CO 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 $20^{\circ }$, 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 $0.09M_{\odot }$. 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 H${}_2$CO emission associated with the protostar.

References in corpus (2)

• Hipparcos distances of Ophiuchus and Lupus cloud complexes
• ALMA observations of the kinematics and chemistry of disc formation

Cited by in corpus (37)

• The ALMA Protostellar Interferometric Line Survey (PILS): First results from an unbiased submillimeter wavelength line survey of the Class 0 protostellar binary IRAS 16293-2422 with ALMA
• A Triple Protostar System Formed via Fragmentation of a Gravitationally Unstable Disk
• Signs of Early-Stage Disk Growth Revealed with ALMA
• The Perseus ALMA Chemistry Survey (PEACHES). I. The Complex Organic Molecules in Perseus Embedded Protostars
• CORINOS I: JWST/MIRI Spectroscopy and Imaging of a Class 0 protostar IRAS 15398-3359
• APEX-CHAMP+ high-J CO observations of low-mass young stellar objects: IV. Mechanical and radiative feedback
• L483: Warm Carbon-Chain Chemistry Source Harboring Hot Corino Activity
• Vertical Structure of the Transition Zone from Infalling Rotating Envelope to Disk in the Class 0 Protostar, IRAS04368+2557
• An evolutionary study of volatile chemistry in protoplanetary disks
• FAUST II. Discovery of a Secondary Outflow in IRAS 15398-3359: Variability in Outflow Direction during the Earliest Stage of Star Formation?
• ALMA resolves the remarkable molecular jet and rotating wind in the extremely radio-quiet galaxy NGC 1377
• Water around IRAS15398-3359 observed with ALMA
• The circumstellar environment around the embedded protostar EC 53
• ALMA observations of envelopes around first hydrostatic core candidates
• Chemical Differentiation and Temperature Distribution on a Few au Scale around the Protostellar Source B335
• Chemical and Physical Characterization of the Isolated Protostellar Source CB68: FAUST. IV
• Outflows, envelopes, and disks as evolutionary indicators in Lupus YSOs
• The magnetic properties of the protostellar core IRAS 15398-3359
• Physical properties of accretion shocks toward the Class I protostellar system Oph-IRS 44
• Molecular Distributions of the Protostellar Envelope and the Outflow of IRAS 15398-3359: Principal Component Analysis
• H${}_2$S observations in young stellar disks in Taurus
• FERIA: Flat Envelope Model with Rotation and Infall under Angular Momentum Conservation
• FAUST VII. Detection of A Hot Corino in the Prototypical Warm Carbon-Chain Chemistry Source IRAS 15398-3359
• ALMA Observations toward the S-shaped Outflow and the Envelope around NGC1333 IRAS 4A2
• Cloudlet Capture Model for Asymmetric Molecular Emission Lines Observed in TMC-1A with ALMA
• The Opaque Heart of the Galaxy IC 860: Analogous Protostellar, Kinematics, Morphology, and Chemistry
• A search for cloud cores affected by shocked carbon chain chemistry in L1251
• Physical conditions for dust grain alignment in Class 0 protostellar cores I. Observations of dust polarization and molecular irradiation tracers
• Predictions for Observing Protostellar Outflows with ALMA
• Synthetic Observations of the Infalling Rotating Envelope: Links between the Physical Structure and Observational Features
• Digging into the Interior of Hot Cores with ALMA (DIHCA). VII. Disk candidates around high-mass stars and evidence of anisotropic infall
• A spectacular galactic scale magnetohydrodynamic powered wind in ESO 320-G030
• Anatomy of the Class I protostar L1489 IRS with NOEMA - II. A disk replenished by a massive streamer
• Episodicity in accretion-ejection processes associated with IRAS 15398-3359
• Early Planet Formation in Embedded Disks (eDisk). XX. Constraining the Chemical Tracers of Young Protostellar Sources
• Substellar candidates at the earliest stages: the SUCANES database
• Rotating Motion of the Outflow of IRAS 16293-2422 A1 at its Origin Point near the Protostar