ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT): I. CO, CS, CN, and H2CO around DG Tau B

Abstract

The chemical composition of planets is inherited by the distribution of the various molecular species in the protoplanetary disk at thetime of their formation. As of today, only a handful of disks has been imaged in multiple spectral lines with high spatial resolution. As part of a small campaign devoted to the chemical characterization of disk-outflow sources in Taurus, we report on new ALMA Band 6 observations with 20 au resolution toward the embedded young star DG Tau B. Images of the continuum emission reveals a dust disk with rings and, putatively, a leading spiral arm. The disk, as well as the prominent outflow cavities, are detected in CO, H2CO, CS, and CN while they remain undetected in SO2, HDO, and CH3OH. From the absorption of the back-side outflow, we inferred that the disk emission is optically thick in the inner 50 au. This morphology explains why no line emission is detected from this inner region and poses some limitations toward the calculation of the dust mass and the characterization of the inner gaseous disk. The H2CO and CS emission from the inner 200 au is mostly from the disk and their morphology is very similar. The CN emission significantly differs from the other two molecules as it is observed only beyond 150 au. This ring-like morphology is consistent with previous observations and the predictions of thermochemical disk models. Finally, we constrained the disk-integrated column density of all molecules. In particular, we found that the CH3OH/H2CO ratio must be smaller than 2, making the methanol non-detection still consistent with the only such a ratio available from the literature (1.27 in TW Hya).

arXiv comment13 pages, 6 figures, accepted by A&A

References in corpus (62)

• Gaia Data Release 2. Summary of the contents and survey properties
• First Results from High Angular Resolution ALMA Observations Toward the HL Tau Region
• The Disk Substructures at High Angular Resolution Project (DSHARP): I. Motivation, Sample, Calibration, and Overview
• ALMA Survey of Lupus Protoplanetary Disks I: Dust and Gas Masses
• Ringed Substructure and a Gap at 1 AU in the Nearest Protoplanetary Disk
• Gravitational Instabilities in Circumstellar Disks
• Gaps and Rings in an ALMA Survey of Disks in the Taurus Star-forming Region
• Trapping dust particles in the outer regions of protoplanetary disks
• Disks ARound TTauri Stars with Sphere (DARTTS-S) I: Sphere / IRDIS Polarimetric Imaging of 8 prominent TTauri Disks
• Spiral Density Waves in a Young Protoplanetary Disk
• A dual-frequency sub-arcsecond study of proto-planetary disks at mm wavelengths: First evidence for radial variations of the dust properties
• Observational Signatures of Planets in Protoplanetary Disks I: Gaps Opened by Single and Multiple Young Planets in Disks
• HST/NICMOS Imaging of Disks and Envelopes Around Very Young Stars
• The cometary composition of a protoplanetary disk as revealed by complex cyanides
• Complex organic molecules in protoplanetary disks
• Why do protoplanetary disks appear not massive enough to form the known exoplanet population?
• First detection of gas-phase methanol in a protoplanetary disk
• The Disk Substructures at High Angular Resolution Project (DSHARP) - IX. A high definition study of the HD 163296 planet forming disk
• The VLA Nascent Disk And Multiplicity Survey of Perseus Protostars (VANDAM). IV. Free-Free Emission from Protostars: Links to Infrared Properties, Outflow Tracers, and Protostellar Disk Masses
• Measuring Turbulence in TW Hya with ALMA: Methods and Limitations
• Disk Imaging Survey of Chemistry with SMA: II. Southern Sky Protoplanetary Disk Data and Full Sample Statistics
• Different dust and gas radial extents in protoplanetary disks: consistent models of grain growth and CO emission
• Disk Imaging Survey of Chemistry with SMA (DISCS): I. Taurus Protoplanetary Disk Data
• An ALMA Survey of CO isotopologue emission from Protoplanetary Disks in Chamaeleon I
• Multiple Gaps in the Disk of the Class I Protostar GY 91
• Evolution of protoplanetary disks from their taxonomy in scattered light: spirals, rings, cavities, and shadows
• Sulfur chemistry in protoplanetary disks: CS and H2CS
• First Detection of the Simplest Organic Acid in a Protoplanetary Disk
• Gas vs dust sizes of protoplanetary disks: effects of dust evolution
• A sensitive survey for 13CO, CN, H2CO and SO in the disks of T Tauri and Herbig Ae stars
• Multiple rings in the transition disk and companion candidates around RXJ1615.3-3255. High contrast imaging with VLT/SPHERE
• The SPHERE view of the planet-forming disk around HD100546
• The ALMA view of the protostellar system HH212 - The wind, the cavity, and the disk
• Temperature, Mass and Turbulence: A Spatially Resolved Multi-Band Non-LTE Analysis of CS in TW~Hya
• A survey of C2H, HCN, and C18O in protoplanetary disks
• Evidence for the start of planet formation in a young circumstellar disk
• ALMA reveals a large structured disk and nested rotating outflows in DG Tau B
• The circumstellar disk HD169142: gas, dust and planets acting in concert?
• Double DCO+ rings reveal CO ice desorption in the outer disk around IM Lup
• High gas/dust size ratio indicating efficient radial drift in the mm-faint CX Tau disk
• The masses of young stars: CN as a probe of dynamical masses
• Chemistry in Disks VIII: the CS molecule as an analytic tracer of turbulence in disks
• CN rings in full protoplanetary disks around young stars as probes of disk structure
• Evidence for a CO desorption front in the outer AS 209 disk
• Direct evidence of multiple reservoirs of volatile nitrogen in a protosolar nebula analogue
• Disk Masses for Embedded Class I Protostars in the Taurus Molecular Cloud
• Tracing kinematical and physical asymmetries in the jet from DG Tau B
• The Distribution and Chemistry of H${}_2$CO in the DM Tau Protoplanetary Disk
• Chemical and kinematic structure of extremely high-velocity molecular jets in the Serpens Main star-forming region
• Upper limits on CH${}_3$OH in the HD 163296 protoplanetary disk: evidence for a low gas-phase CH${}_3$OH/H${}_2$CO ratio
• WL 17: A Young Embedded Transition Disk
• Increased H${}_2$CO production in the outer disk around HD 163296
• H2CO distribution and formation in the TW Hya disk
• Probing midplane CO abundance and gas temperature with DCO${}^{+}$ in the protoplanetary disk around HD 169142
• Kinematics of the Outflow From The Young Star DG Tau B: Rotation in the vicinities of an optical jet
• Deuterated methanol on Solar System scale around the HH212 protostar
• First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lup
• Organic molecules in the protoplanetary disk of DG Tau revealed by ALMA
• Warm formaldehyde in the Oph IRS 48 transitional disk
• The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN
• H2CO ortho-to-para ratio in the protoplanetary disk HD 163296
• Absolute Properties of the Eclipsing $\gamma$ Dor Star V404 Lyrae

Cited by in corpus (21)

• Four annular structures in a protostellar disk less than 500,000 years old
• ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT) VI: Accretion shocks in the disk of DG Tau and HL Tau
• ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT) II: Vertical stratification of CO, CS, CN, H${}_2$CO, and CH${}_3$OH in a Class I disk
• Early Planet Formation in Embedded Disks (eDisk). II. Limited Dust Settling and Prominent Snow Surfaces in the Edge-on Class I Disk IRAS 04302+2247
• ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT) V: Sample, overview, and demography of disk molecular emission
• Modeling the CO outflow in DG Tau B: Swept-up shells versus perturbed MHD disk wind
• The TW Hya Rosetta Stone Project II: Spatially resolved emission of formaldehyde hints at low-temperature gas-phase formation
• Exploring the link between star and planet formation with Ariel
• JWST study of the DG Tau B disk wind candidate: I -- Overview and Nested H${}_2$/CO outflows
• Ring formation by coagulation of dust aggregates in early phase of disk evolution around a protostar
• The SVS13-A Class I chemical complexity as revealed by S-bearing species. SOLIS XIII
• ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT) III: The interplay between gas and dust in the protoplanetary disk of DG Tau
• H${}_2$S observations in young stellar disks in Taurus
• ALMA reveals thermal and non-thermal desorption of methanol ice in the HD 100546 protoplanetary disk
• Radial and vertical constraints on the icy origin of H${}_2$CO in the HD 163296 Protoplanetary Disk
• Machine learning-accelerated chemistry modeling of protoplanetary disks
• Using HCO${}^{+}$ isotopologues as tracers of gas depletion in protoplanetary disk gaps
• ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT) VII: the layered molecular outflow from HL Tau and its relationship with the ringed disk
• Radiative Nonideal MHD Simulations of Inner Protoplanetary Disks: Temperature Structures, Asymmetric Winds, and Episodic Surface Accretion
• Synthetic Observations of the Infalling Rotating Envelope: Links between the Physical Structure and Observational Features
• Molecules with ALMA at Planet-forming Scales (MAPS) III: Characteristics of Radial Chemical Substructures