Early Planet Formation in Embedded Disks (eDisk) III: A first high-resolution view of sub-mm continuum and molecular line emission toward the Class 0 protostar L1527 IRS

Abstract

Studying the physical and chemical conditions of young embedded disks is crucial to constrain the initial conditions for planet formation. Here, we present Atacama Large Millimeter/submillimeter Array (ALMA) observations of dust continuum at $\sim$0.06" (8 au) resolution and molecular line emission at $\sim$0.17" (24 au) resolution toward the Class 0 protostar L1527 IRS from the Large Program eDisk (Early Planet Formation in Embedded Disks). The continuum emission is smooth without substructures, but asymmetric along both the major and minor axes of the disk as previously observed. The detected lines of ${}^{12}$CO, ${}^{13}$CO, C${}^{18}$O, H${}_2$CO, c-C${}_3$H${}_2$, SO, SiO, and DCN trace different components of the protostellar system, with a disk wind potentially visible in ${}^{12}$CO. The ${}^{13}$CO brightness temperature and the H${}_2$CO line ratio confirm that the disk is too warm for CO freeze out, with the snowline located at $\sim$350 au in the envelope. Both molecules show potential evidence of a temperature increase around the disk-envelope interface. SO seems to originate predominantly in UV-irradiated regions such as the disk surface and the outflow cavity walls rather than at the disk-envelope interface as previously suggested. Finally, the continuum asymmetry along the minor axis is consistent with the inclination derived from the large-scale (100" or 14,000 au) outflow, but opposite to that based on the molecular jet and envelope emission, suggesting a misalignment in the system. Overall, these results highlight the importance of observing multiple molecular species in multiple transitions to characterize the physical and chemical environment of young disks.

27 pages, 16 figures, 2 tables, 10 pages appendix with 12 figures. Accepted for publication in ApJ as one of the first-look papers of the eDisk ALMA Large Program

References in corpus (28)

• Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
• The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. A Statistical Characterization of Class 0 and I Protostellar Disks
• A Large Catalog of Accurate Distances to Local Molecular Clouds: The Gaia DR2 Edition
• Dust masses of young disks: constraining the initial solid reservoir for planet formation
• Experimental evidence for Glycolaldehyde and Ethylene Glycol formation by surface hydrogenation of CO molecules under dense molecular cloud conditions
• Formation of a Keplerian disk in the infalling envelope around L1527 IRS: transformation from infalling motions to Kepler motions
• Hydrocarbon emission rings in protoplanetary disks induced by dust evolution
• Early Planet Formation in Embedded Disks (eDisk). I. Overview of the Program and First Results
• ALMA Observations of Infalling Flows toward the Keplerian Disk around the Class I Protostar L1489 IRS
• The Ophiuchus DIsk Survey Employing ALMA (ODISEA): Disk Dust Mass Distributions across Protostellar Evolutionary Classes
• Constraining the Envelope Structure of L1527 IRS: Infrared Scattered Light Modeling
• Spatially resolved l-c3h+ emission in the horsehead photodissociation region: Further evidence for a top-down hydrocarbon chemistry
• ALMA Observations of the Protostar L1527 IRS: Probing Details of the Disk and the Envelope Structures
• Vertical Structure of the Transition Zone from Infalling Rotating Envelope to Disk in the Class 0 Protostar, IRAS04368+2557
• Searching for kinematic evidence of Keplerian disks around Class 0 protostars with CALYPSO
• 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
• A 3D view of the Taurus star-forming region by Gaia and Herschel: multiple populations related to the filamentary molecular cloud
• Modeling accretion shocks at the disk-envelope interface -- Sulfur chemistry
• Substructure Formation in a Protostellar Disk of L1527 IRS
• The TW Hya Rosetta Stone Project II: Spatially resolved emission of formaldehyde hints at low-temperature gas-phase formation
• Evaporation of grain-surface species by shock waves in proto-planetary disk
• Resolved molecular line observations reveal an inherited molecular layer in the young disk around TMC1A
• Formation of dust clumps with sub-Jupiter mass and cold shadowed region in gravitationally unstable disk around Class 0/I protostar in L1527 IRS
• Testing Disk Identification Methods Through Numerical Simulations of Protostellar Evolution
• Physical and Chemical Structure of the Disk and Envelope of the Class 0/I Protostar L1527
• Protostellar disks subject to infall: a one-dimensional inviscid model and comparison with ALMA observations
• Centrifugal Barrier and Super-Keplerian Rotation in Protostellar Disk Formation
• Time variability in the bipolar scattered light nebula of L1527 IRS: A possible warped inner disk

Cited by in corpus (18)

• Early Planet Formation in Embedded Disks (eDisk). I. Overview of the Program and First Results
• 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
• Early Planet Formation in Embedded Disks (eDisk). IV. The Ringed and Warped Structure of the Disk around the Class I Protostar L1489 IRS
• JWST Observations of Young protoStars (JOYS). Overview of gaseous molecular emission and absorption in low-mass protostars
• Probing the eccentricity in protostellar discs -- Modeling kinematics and morphologies
• Early Planet Formation in Embedded Disks (eDisk) XVI: An asymmetric dust disk driving a multi-component molecular outflow in the young Class 0 protostar GSS30 IRS3
• HDO ice detected toward an isolated low-mass protostar with JWST
• Discs are born eccentric
• Early Planet Formation in Embedded Disks (eDisk). XI. A high-resolution view toward the BHR 71 Class 0 protostellar wide binary
• Synthetic Observations of the Infalling Rotating Envelope: Links between the Physical Structure and Observational Features
• Hidden under a warm blanket: If planets existed in protostellar disks, they would hardly produce observable substructures
• A question of personalities: evolution of viscous and wind-driven protoplanetary discs in the presence of dead zones
• Sulfur oxides tracing streamers and shocks at low mass protostellar disk-envelope interfaces
• Early Planet Formation in Embedded Disks (eDisk). XX. Constraining the Chemical Tracers of Young Protostellar Sources
• Numerical Insights into Disk Accretion, Eccentricity, and Kinematics in the Class 0 phase
• Modelling the Break in the Specific Angular Momentum within the Envelope-Disk Transition Zone
• JOYS: JWST MIRI/MRS spectra of the inner 500 au region of the L1527 IRS bipolar outflow
• HOTDISK. Finding Massive Protostellar Disks with Water and Refractory Molecular Species