Molecules with ALMA at Planet-forming Scales (MAPS) IV: Emission Surfaces and Vertical Distribution of Molecules

Abstract

The Molecules with ALMA at Planet-forming Scales (MAPS) Large Program provides a unique opportunity to study the vertical distribution of gas, chemistry, and temperature in the protoplanetary disks around IM Lup, GM Aur, AS 209, HD 163296, and MWC 480. By using the asymmetry of molecular line emission relative to the disk major axis, we infer the emission height ($z$) above the midplane as a function of radius ($r$). Using this method, we measure emitting surfaces for a suite of CO isotopologues, HCN, and C${}_2$H. We find that ${}^{12}$CO emission traces the most elevated regions with $z/r>0.3$, while emission from the less abundant ${}^{13}$CO and C${}^{18}$O probes deeper into the disk at altitudes of $z/r\lesssim 0.2$. C${}_2$H and HCN have lower opacities and SNRs, making surface fitting more difficult, and could only be reliably constrained in AS 209, HD 163296, and MWC 480, with $z/r\lesssim 0.1$, i.e., relatively close to the planet-forming midplanes. We determine peak brightness temperatures of the optically thick CO isotopologues and use these to trace 2D disk temperature structures. Several CO temperature profiles and emission surfaces show dips in temperature or vertical height, some of which are associated with gaps and rings in line and/or continuum emission. These substructures may be due to local changes in CO column density, gas surface density, or gas temperatures, and detailed thermo-chemical models are necessary to better constrain their origins and relate the chemical compositions of elevated disk layers with those of planet-forming material in disk midplanes. This paper is part of the MAPS special issue of the Astrophysical Journal Supplement.

arXiv comment31 pages, 20 figures, accepted for publication in ApJS, MAPS cross-references updated

References in corpus (66)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The NumPy array: a structure for efficient numerical computation
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Protoplanetary Disks and Their Evolution
• The Disk Substructures at High Angular Resolution Project (DSHARP): I. Motivation, Sample, Calibration, and Overview
• Passive irradiated circumstellar disks with an inner hole
• The Mass Dependence Between Protoplanetary Disks and their Stellar Hosts
• ALMA Survey of Lupus Protoplanetary Disks I: Dust and Gas Masses
• Flaring vs. self-shadowed disks: the SEDs of Herbig Ae/Be stars
• The Disk Substructures at High Angular Resolution Project (DSHARP): II. Characteristics of Annular Substructures
• A Steeper than Linear Disk Mass-Stellar Mass Scaling Relation
• The effect of dust settling on the appearance of protoplanetary disks
• Observations of Protoplanetary Disk Structures
• Radiation thermo-chemical models of protoplanetary disks I. Hydrostatic disk structure and inner rim
• Disks ARound TTauri Stars with Sphere (DARTTS-S) I: Sphere / IRDIS Polarimetric Imaging of 8 prominent TTauri Disks
• A Kinematical Detection of Two Embedded Jupiter Mass Planets in HD 163296
• Probing the structure of protoplanetary disks: a comparative study of DM Tau, LkCa 15 and MWC 480
• Molecules with ALMA at Planet-forming Scales (MAPS) I: Program Overview and Highlights
• A Spatially Resolved Vertical Temperature Gradient in the HD 163296 Disk
• Meridional flows in the disk around a young star
• Chemical Processes in Protoplanetary Disks
• Direct mapping of the temperature and velocity gradients in discs. Imaging the vertical CO snow line around IM Lupi
• One Solution to the Mass Budget Problem for Planet Formation: Optically Thick Disks with Dust Scattering
• Unveiling the gas and dust disk structure in HD 163296 using ALMA observations
• Chemical evolution of turbulent protoplanetary disks and the Solar nebula
• Hydrocarbon emission rings in protoplanetary disks induced by dust evolution
• The Coupled Physical Structure of Gas and Dust in the IM Lup Protoplanetary Disk
• The Disk Substructures at High Angular Resolution Project (DSHARP) - IX. A high definition study of the HD 163296 planet forming disk
• Molecules with ALMA at Planet-forming Scales (MAPS) V: CO gas distributions
• ALMA continuum observations of the protoplanetary disk AS 209. Evidence of multiple gaps opened by a single planet
• Submillimeter lines from circumstellar disks around pre-main sequence stars
• Disk Imaging Survey of Chemistry with SMA: II. Southern Sky Protoplanetary Disk Data and Full Sample Statistics
• Nine localised deviations from Keplerian rotation in the DSHARP circumstellar disks: Kinematic evidence for protoplanets carving the gaps
• Different dust and gas radial extents in protoplanetary disks: consistent models of grain growth and CO emission
• Meridional circulation of gas into gaps opened by giant planets in three-dimensional low-viscosity disks
• Chemistry of a protoplanetary disk with grain settling and Lyman alpha radiation
• Molecules with ALMA at Planet-forming Scales (MAPS) XIV: Revealing disk substructures in multi-wavelength continuum emission
• A Close-up View of the Young Circumbinary Disk HD 142527
• A multi-frequency ALMA characterization of substructures in the GM Aur protoplanetary disk
• Polarized disk emission from Herbig Ae/Be stars observed using Gemini Planet Imager: HD 144432, HD 150193, HD 163296, and HD 169142
• Empirical Temperature Measurement in Protoplanetary Disks
• Evidence For A Vertical Dependence on the Pressure Structure in AS 209
• Dust modeling of the combined ALMA and SPHERE datasets of HD163296. Is HD163296 really a Meeus group II disk?
• Multiple Carbon monoxide Snow-lines in Disks Sculpted by Radial Drift
• Spiral Arms and a Massive Dust Disk with non-Keplerian Kinematics: Possible Evidence for Gravitational Instability in the Disk of Elias 2-27
• Molecules with ALMA at Planet-forming Scales (MAPS) VI: Distribution of the small organics HCN, C2H, and H2CO
• Probing CO and N${}_2$ Snow Surfaces in Protoplanetary Disks with N${}_2$H${}^{+}$ Emission
• The Flying Saucer: Tomography of the thermal and density gas structure of an edge-on protoplanetary disk
• 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
• Midplane temperature and outer edge of the protoplanetary disk around HD 163296
• Variable H${}^{13}$CO${}^{+}$ Emission in the IM Lup Disk: X-ray Driven Time-Dependent Chemistry?
• Jets, accretion, coronae and all that: The enigmatic X-rays from the Herbig star HD 163296
• High-Contrast NIR Polarization Imaging of MWC480
• Gas density perturbations induced by forming planet(s) in the AS 209 protoplanetary disk as seen with ALMA
• Interpreting high spatial resolution line observations of planet-forming disks with gaps and rings -- The case of HD 163296
• Observational Signatures of Planets in Protoplanetary Disks: Planet-Induced Line Broadening in Gaps
• Investigating the Relative Gas and Small Dust Grain Surface Heights in Protoplanetary Disks
• Disk Illumination and Jet Variability of the Herbig Ae Star HD 163296 Using Multi-Epoch HST/STIS Optical, Near-IR, and Radio Imagery and Spectroscopy
• A Three Dimensional View of Gomez's Hamburger
• H2CO ortho-to-para ratio in the protoplanetary disk HD 163296
• Using Multiwavelength Variability to Explore the Connection between X-ray Emission, the Far-Ultraviolet H2 Bump, and Accretion in T Tauri Stars
• The TW Hya Rosetta Stone Project I: Radial and vertical distributions of DCN and DCO+
• The TW Hya Rosetta Stone Project IV: A hydrocarbon rich disk atmosphere
• Tracing Molecular Stratification within an Edge-on Protoplanetary Disk

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• Molecules with ALMA at Planet-forming Scales (MAPS). IX. Distribution and Properties of the Large Organic Molecules HC${}_3$N, CH${}_3$CN, and $c$-C${}_3$H${}_2$
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• A dichotomy in group II Herbig disks: ALMA gas disk height measurements show both shadowed large vertically extended disks and compact flat disks
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• Vertical CO surfaces as a probe for protoplanetary disk mass and carbon depletion
• An SMA Survey of Chemistry in Disks around Herbig AeBe Stars
• Vertical and radial distribution of atomic carbon in HD 163296
• PRODIGE -- Planet-forming disks in Taurus with NOEMA. I. Overview and first results for 12CO, 13CO, and C18O
• Dust ring and gap formation by gas flow induced by low-mass planets embedded in protoplanetary disks $\mathrm{I}$. Steady-state model
• Constraints on the gas-phase C/O ratio of DR Tau's outer disk from CS, SO, and C${}_2$H observations
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• Molecules with ALMA at Planet-forming Scales. XX. The Massive Disk Around GM Aurigae
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