A young bipolar outflow from IRAS 15398-3359

Abstract

Changing physical conditions in the vicinity of protostars allow for a rich and interesting chemistry to occur. Heating and cooling of the gas allows molecules to be released from and frozen out on dust grains. These changes in physics, traced by chemistry, as well as the kinematical information allows us to distinguish between different scenarios describing the infall of matter and the launching of molecular outflows and jets. We aim at determining the spatial distribution of different species, of different chemical origin. This is to examine the physical processes in play in the observed region. From the kinematical information of the emission lines we aim at determining the nature of the infalling and outflowing gas in the system. We also aim at determining the physical properties of the outflow. Maps from the Sub-Millimeter Array reveal the spatial distribution of the gaseous emission toward IRAS15398-3359. The line radiative transfer code LIME is used to construct a full 3D model of the system taking all relevant components and scales into account. CO, HCO+ and N2H+ are detected and are shown to trace the motions of the outflow. For CO, also the circumstellar envelope and the surrounding cloud have a profound impact on the observed line profiles. N2H+ is detected in the outflow, but is suppressed towards the central region, perhaps due to the competing reaction between CO and H3+ in the densest regions as well as destruction of N2H+ by CO. N2D+ is detected in a ridge south-west from the protostellar condensation. The morphology and kinematics of the CO emission suggests that the source is younger than 1000 years. The mass, momentum, momentum rate, mechanical luminosity, kinetic energy and mass-loss rate are also all estimated to be low. A full 3D radiative transfer model of the system can explain all the kinematical and morphological features in the system.

11 pages, 7 figures

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Cited by in corpus (15)

• Astrochemistry During the Formation of Stars
• Signs of Early-Stage Disk Growth Revealed with ALMA
• CORINOS I: JWST/MIRI Spectroscopy and Imaging of a Class 0 protostar IRAS 15398-3359
• FAUST II. Discovery of a Secondary Outflow in IRAS 15398-3359: Variability in Outflow Direction during the Earliest Stage of Star Formation?
• The Co-evolution of Disk and Star in Embedded Stages: The Case of the Very Low-mass Protostar
• The ALMA-PILS survey: Gas dynamics in IRAS 16293$-$2422 and the connection between its two protostars
• Water around IRAS15398-3359 observed with ALMA
• Sub-arcsecond Kinematic Structure of the Outflow in the Vicinity of the Protostar in L483
• 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
• FAUST VII. Detection of A Hot Corino in the Prototypical Warm Carbon-Chain Chemistry Source IRAS 15398-3359
• Physical conditions for dust grain alignment in Class 0 protostellar cores I. Observations of dust polarization and molecular irradiation tracers
• The kinematics of the magnetised protostellar core IRAS15398-3359