Unveiling the physical conditions of the youngest disks: A warm embedded disk in L1527

Abstract

[Abridged] Protoplanetary disks have been studied extensively, both physically and chemically, to understand the environment in which planets form. However, the first steps of planet formation are likely to occur already when the protostar and disk are still embedded in their natal envelope. The initial conditions for planet formation may thus be provided by these young embedded disks, of which the physical and chemical structure is poorly characterized. We aim to constrain the midplane temperature structure, one of the critical unknowns, of the embedded disk around L1527. In particular, we set out to determine whether there is an extended cold outer region where CO is frozen out, as is the case for Class II disks. We use archival ALMA data to directly observe the midplane of the near edge-on L1527 disk. Optically thick ${}^{13}$CO ($J=2-1$) and C${}^{18}$O ($J=2-1$) emission is observed throughout the disk and inner envelope, while N${}_2$D${}^{+}(J=3-2$), which can only be abundant when CO is frozen out, is not detected. Both CO isotopologues have brightness temperatures $\gtrsim$ 25 K along the midplane. Disk and envelope emission can be disentangled kinematically, because the largest velocities are reached in the disk. A power law radial temperature profile constructed using the highest midplane temperature at these velocities suggest that the temperature is above 20 K out to at least 75 AU, and possibly throughout the entire 125 AU disk. Radiative transfer models show that a model without CO freeze-out in the disk matches the C${}^{18}$O observations better than a model with the CO snowline at $\sim$70 AU. In addition, there is no evidence for a large (order of magnitude) depletion of CO. The disk around L1527 is likely to be warm enough to have CO present in the gas phase throughout the disk, suggesting that young embedded disks can indeed be warmer than the more evolved Class II disks.

16 pages, 13 figures, 2 tables (and 5 pages of appendix with 8 figures). Accepted for publication in A&A

References in corpus (31)

• Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
• A Steeper than Linear Disk Mass-Stellar Mass Scaling Relation
• Towards Chemical Constraints on Hot Jupiter Migration
• Analytical protostellar disk models 1: the effect of internal dissipation and surface irradiation on the structure of disks and the location of the snow line around Sun-like stars
• The chemical history of molecules in circumstellar disks. I. Ices
• Direct mapping of the temperature and velocity gradients in discs. Imaging the vertical CO snow line around IM Lupi
• Lupus disks with faint CO isotopologues: low gas/dust or large carbon depletion?
• Formation of a Keplerian disk in the infalling envelope around L1527 IRS: transformation from infalling motions to Kepler motions
• Setting the volatile composition of (exo)planet-building material. Does chemical evolution in disk midplanes matter?
• The N2D+/N2H+ ratio as an evolutionary tracer of Class 0 protostars
• Signs of Early-Stage Disk Growth Revealed with ALMA
• Mass inventory of the giant-planet formation zone in a solar nebula analog
• Grain growth in the envelopes and disks of Class I protostars
• An ALMA Survey of CO isotopologue emission from Protoplanetary Disks in Chamaeleon I
• Robustness of N2H+ as tracer of the CO snowline
• The ALMA view of the protostellar system HH212 - The wind, the cavity, and the disk
• An ALMA survey of DCN/H${}^{13}$CN and DCO${}^{+}$/H${}^{13}$CO${}^{+}$ in protoplanetary disks
• Cometary ices in forming protoplanetary disc midplanes
• Constraining the Envelope Structure of L1527 IRS: Infrared Scattered Light Modeling
• SMA observations of young disks: separating envelope, disk, and stellar masses in class I YSOs
• ALMA Observations of the Protostar L1527 IRS: Probing Details of the Disk and the Envelope Structures
• The Flying Saucer: Tomography of the thermal and density gas structure of an edge-on protoplanetary disk
• Vertical Structure of the Transition Zone from Infalling Rotating Envelope to Disk in the Class 0 Protostar, IRAS04368+2557
• A deeply embedded young protoplanetary disk around L1489 IRS observed by the submillimeter array
• ALMA observations of the kinematics and chemistry of disc formation
• The VLA Nascent Disk And Multiplicity (VANDAM) Survey of Perseus Protostars. Resolving the Sub-Arcsecond Binary System in NGC 1333 IRAS2A
• DCO${}^{+}$, DCN and N${}_2$D${}^{+}$ reveal three different deuteration regimes in the disk around the Herbig Ae star HD163296
• Analytical Formulas of Molecular Ion Abundances and N2H+ Ring in Protoplanetary Disks
• A low-mass protostar's disk-envelope interface: disk-shadowing evidence from ALMA DCO+ observations of VLA1623
• Disentangling Hot Jupiters formation location from their chemical composition
• An SMA Continuum Survey of Circumstellar Disks in the Serpens Star-Forming Region

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