Gas kinematics of key prebiotic molecules in GV Tau N revealed with an ALMA, PdBI, and Herschel synergy

Abstract

A large effort has been made to detect warm gas in the planet formation zone of circumstellar discs using space and ground-based near infrared facilities. GV Tau N, the most obscured component of the GV Tau system, is an outstanding source, being one of the first targets detected in HCN and the only one detected in CH${}_4$ so far. Although near infrared observations have shed light on its chemical content, the physical structure and kinematics of the circumstellar matter remained unknown. We use interferometric images of the HCN 3-2 and ${}^{13}$CO 3-2 lines, and far-IR observations of ${}^{13}$CO, HCN, CN and H${}_2$O transitions to discern the morphology, kinematics, and chemistry of the dense gas close to the star. These observations constitute the first detection of H${}_2$O towards GV Tau N. Moreover, ALMA high spatial resolution (~ 7 au) images of the continuum at 1.1 mm and the HCN 3-2 line resolve different gas components towards GV Tau N, a gaseous disc with R~25 au, an ionized jet, and one (or two) molecular outflows. The asymmetric morphology of the gaseous disc shows that it has been eroded by the jet. All observations can be explained if GV Tau N is binary, and the primary component has a highly inclined individual disc relative to the circumbinary disc. We discuss the origin of the water and the other molecules emission according to this scenario. In particular, we propose that the water emission would come from the disrupted gaseous disc and the molecular outflows.

12 pages, 8 figures. Accepted for publication in MNRAS

References in corpus (21)

• The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. A Statistical Characterization of Class 0 and I Protostellar Disks
• H2O and OH gas in the terrestrial planet-forming zones of protoplanetary disks
• Misaligned Disks in the Binary Protostar IRS 43
• Shells, jets, and internal working surfaces in the molecular outflow from IRAS 04166+2706
• Circumstellar disks around Herbig Be stars
• Proplyds and Massive Disks in the Orion Nebula Cluster Imaged with CARMA and SMA
• A circumbinary protoplanetary disc in a polar configuration
• The depletion of water during dispersal of planet-forming disk regions
• Spiral Arms, Infall, and Misalignment of the Circumbinary Disk from the Circumstellar Disks in the Protostellar Binary System L1551 NE
• Warm HCN, C2H2, and CO in the disk of GV Tau
• Searching for kinematic evidence of Keplerian disks around Class 0 protostars with CALYPSO
• The Herschel Data Processing System - HIPE and Pipelines - Up and Running Since the Start of the Mission
• Stellar and Circumstellar Properties of the Pre-Main Sequence Binary GV Tau from Infrared Spectroscopy
• A high resolution mid-infrared survey of water emission from protoplanetary disks
• Resolved Multifrequency Radio Observations of GG Tau
• Efficient Dust Ring Formation in Misaligned Circumbinary Discs
• Water in star-forming regions with Herschel (WISH) V. The physical conditions in low-mass protostellar outflows revealed by multi-transition water observations
• Missing water in Class I protostellar disks
• Radio Monitoring of Protoplanetary Discs
• Constraining the Disk Masses of the Class I Binary Protostar GV Tau
• Emission from Water Vapor and Absorption from Other Gases at 5-7.5 Microns in Spitzer-IRS Spectra of Protoplanetary Disks

Cited by in corpus (4)

• Millimeter-sized Dust Grains Appear Surviving the Water-sublimating Temperature in the Inner 10 au of the FU Ori Disk
• H${}_2$S observations in young stellar disks in Taurus
• High-Resolution Mid-Infrared Spectroscopy of GV Tau N: Surface Accretion and Detection of Ammonia in a Young Protoplanetary Disk
• Probing the kinematics and chemistry of the hot core Mon R 2 IRS 3 using ALMA observations