FAUST XV. A disk wind mapped by CH${}_3$OH and SiO in the inner 300 au of the NGC 1333 IRAS 4A2 protostar

Abstract

Context. Understanding the connection between outflows, winds, accretion and disks in the inner protostellar regions is crucial for comprehending star and planet formation process. Aims. We aim to we explore the inner 300 au of the protostar IRAS 4A2 as part of the ALMA FAUST Large Program. Methods. We analysed the kinematical structures of SiO and CH${}_3$OH emission with 50 au resolution. Results. The emission arises from three zones: i) a very compact and unresolved region ($<$50 au) dominated by the ice sublimation zone, at $\pm$1.5 km s${}^{-1}$ with respect to vsys, traced by methanol; ii) an intermediate region (between 50 au and 150 au) traced by both SiO and CH${}_3$OH, between 2 and 6 km s${}^{-1}$ with respect to vsys, with an inverted velocity gradient (with respect to the large scale emission), whose origin is not clear; iii) an extended region ($>$150 au) traced by SiO, above 7 km s${}^{-1}$ with respect to vsys, and dominated by the outflow. In the intermediate region we estimated a CH${}_3$OH/SiO abundance ratio of about 120-400 and a SiO/H${}_2$ abundance of 10${}^{-8}$. We explored various possibilities to explain the origin of this region such as, rotating disk/inner envelope, jet on the plane of the sky/precessing, wide angle disk wind. Conclusions. We propose that CH${}_3$OH and SiO in the inner 100 au probe the base of a wide-angle disk wind. The material accelerated in the wind crosses the plane of the sky, giving rise to the observed inverted velocity gradient, and sputtering the grain mantles and cores releasing CH${}_3$OH and SiO. This is the first detection of a disk wind candidate in SiO, and the second ever in CH${}_3$OH.

Accepted in A&A Letters

References in corpus (31)

• SiO line emission from C-type shock waves : interstellar jets and outflows
• Parametrization of C-shocks. Evolution of the Sputtering of Grains
• Seeds Of Life In Space (SOLIS): The organic composition diversity at 300--1000 au scale in Solar-type star forming regions
• Questioning the spatial origin of complex organic molecules in young protostars with the CALYPSO survey
• Binding energies of interstellar molecules on crystalline and amorphous models of water ice by ab-initio calculations
• ALMA discovery of a rotating SO/SO${}_2$ flow in HH212. A possible MHD disk wind?
• Low velocity shocks: signatures of turbulent dissipation in diffuse irradiated gas
• Complex organics in IRAS 4A revisited with ALMA and PdBI: Striking contrast between two neighbouring protostellar cores
• PdBI sub-arcsecond study of the SiO microjet in HH212 - Origin and collimation of Class 0 jets
• ALMA reveals a large structured disk and nested rotating outflows in DG Tau B
• Low dust emissivities and radial variations in the envelopes of Class 0 protostars: a signature of early grain growth?
• The CALYPSO IRAM-PdBI survey of jets from Class 0 protostars. Are jets ubiquitous in young stars ?
• Hot Corinos Chemical Diversity: Myth or Reality?
• Glycolaldehyde in Perseus young solar analogs
• Constraining MHD disk winds with ALMA. Apparent rotation signatures and application to HH212
• Seeds of Life in Space (SOLIS). X. Interstellar Complex Organic Molecules in the NGC 1333 IRAS 4A outflows
• Seeds of Life in Space (SOLIS). VI. Chemical evolution of sulfuretted species along the outflows driven by the low-mass protostellar binary NGC1333-IRAS4A
• First Detection of Interaction between a Magnetic Disk Wind and an Episodic Jet in a Protostellar System
• Constraining the Infalling Envelope Models of Embedded Protostars: BHR 71 and its Hot Corino
• Time-Resolved AU-Scale Jets Traced by Masers in the IRAS 4A/B Regions of NGC1333
• Acetaldehyde binding energies: a coupled experimental and theoretical study
• A train of shocks at 3000 au scale? Exploring the clash of an expanding bubble into the NGC 1333 IRAS 4 region. SOLIS XIV
• Stratified Distribution of Organic Molecules at the Planet-Formation Scale in the HH 212 Disk Atmosphere
• Dust hot spots at 10 au scales around the Class 0 binary IRAS 16293-2422 A: a departure from the passive irradiation model
• Chemical Differentiation and Temperature Distribution on a Few au Scale around the Protostellar Source B335
• Magneto-Centrifugal Origin for Protostellar Jets Validated through Detection of Radial Flow at the Jet Base
• ALMA view of the L1448-mm protostellar system on disk scales: CH${}_3$OH and H${}^{13}$CN as new disk wind tracers
• The evolutionary status of dense cores in the NGC 1333 IRAS 4 region
• Streamers feeding the SVS13-A protobinary system: astrochemistry reveals accretion shocks?
• ALMA Observations toward the S-shaped Outflow and the Envelope around NGC1333 IRAS 4A2
• Tracking the ice mantle history in the Solar-type Protostars of NGC 1333 IRAS 4

Cited by in corpus (1)

• FAUST XX. The chemical structure and temperature profile of the IRAS 4A2 hot corino at 20-50 au