Molecules with ALMA at Planet-forming Scales (MAPS) III: Characteristics of Radial Chemical Substructures

Abstract

The Molecules with ALMA at Planet-forming Scales (MAPS) Large Program provides a detailed, high resolution ($\sim$10-20 au) view of molecular line emission in five protoplanetary disks at spatial scales relevant for planet formation. Here, we present a systematic analysis of chemical substructures in 18 molecular lines toward the MAPS sources: IM Lup, GM Aur, AS 209, HD 163296, and MWC 480. We identify more than 200 chemical substructures, which are found at nearly all radii where line emission is detected. A wide diversity of radial morphologies - including rings, gaps, and plateaus - is observed both within each disk and across the MAPS sample. This diversity in line emission profiles is also present in the innermost 50 au. Overall, this suggests that planets form in varied chemical environments both across disks and at different radii within the same disk. Interior to 150 au, the majority of chemical substructures across the MAPS disks are spatially coincident with substructures in the millimeter continuum, indicative of physical and chemical links between the disk midplane and warm, elevated molecular emission layers. Some chemical substructures in the inner disk and most chemical substructures exterior to 150 au cannot be directly linked to dust substructure, however, which indicates that there are also other causes of chemical substructures, such as snowlines, gradients in UV photon fluxes, ionization, and radially-varying elemental ratios. This implies that chemical substructures could be developed into powerful probes of different disk characteristics, in addition to influencing the environments within which planets assemble. This paper is part of the MAPS special issue of the Astrophysical Journal Supplement.

arXiv comment62 pages, 31 figures, accepted for publication in ApJS, MAPS cross-references updated, corrected Figure 21, updated gas disk sizes (Table 2, Figures 15-16) from associated Erratum

References in corpus (123)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• 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
• Spectral Energy Distributions of T Tauri Stars With Passive Circumstellar Disks
• 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
• Planetary Candidates Observed by Kepler, III: Analysis of the First 16 Months of Data
• The effects of snowlines on C/O in planetary atmospheres
• Protoplanetary Disk Structures in Ophiuchus
• Ringed Substructure and a Gap at 1 AU in the Nearest Protoplanetary Disk
• Gaps and Rings in an ALMA Survey of Disks in the Taurus Star-forming Region
• The Disk Substructures at High Angular Resolution Project (DSHARP): II. Characteristics of Annular Substructures
• X-Shooter spectroscopy of young stellar objects in Lupus: Accretion properties of class II and transitional objects
• Observations of Protoplanetary Disk Structures
• The Disk Substructures at High Angular Resolution Project (DSHARP): VII. The Planet-Disk Interactions Interpretation
• ALMA Survey of Lupus Protoplanetary Disks II: Gas Disk Radii
• Disks ARound TTauri Stars with Sphere (DARTTS-S) I: Sphere / IRDIS Polarimetric Imaging of 8 prominent TTauri Disks
• Evidence of fast pebble growth near condensation fronts in the HL Tau protoplanetary disk
• Characterization of exoplanets from their formation I: Models of combined planet formation and evolution
• Probing the structure of protoplanetary disks: a comparative study of DM Tau, LkCa 15 and MWC 480
• Sintering-induced Dust Ring Formation in Protoplanetary Disks: Application to the HL Tau Disk
• Molecules with ALMA at Planet-forming Scales (MAPS) I: Program Overview and Highlights
• A Three-Dimensional View of Turbulence: Constraints on Turbulent Motions in the HD 163296 Protoplanetary Disk using DCO${}^{+}$
• The cometary composition of a protoplanetary disk as revealed by complex cyanides
• ALMA unveils rings and gaps in the protoplanetary system HD 169142: signatures of two giant protoplanets
• Resolved gas cavities in transitional disks inferred from CO isotopologues with ALMA
• A Spatially Resolved Vertical Temperature Gradient in the HD 163296 Disk
• The Radial Distribution of H2 and CO in TW Hya as Revealed by Resolved ALMA Observations of CO Isotopologues
• A Millimeter Continuum Size-Luminosity Relationship for Protoplanetary Disks
• Meridional flows in the disk around a young star
• Direct mapping of the temperature and velocity gradients in discs. Imaging the vertical CO snow line around IM Lupi
• 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
• A Spatially Resolved Inner Hole in the Disk around GM Aurigae
• Observations of edge-on protoplanetary disks with ALMA I. Results from continuum data
• 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
• Gas density drops inside dust cavities of transitional disks around young stars observed with ALMA
• Highly structured disk around the planet host PDS 70 revealed by high-angular resolution observations with ALMA
• Gas and Dust Emission at the Outer Edge of Protoplanetary Disks
• 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
• Particle Concentration At Planet Induced Gap Edges and Vortices: I. Inviscid 3-D Hydro Disks
• CO and dust properties in the TW Hya disk from high-resolution ALMA observations
• Mass constraint for a planet in a protoplanetary disk from the gap width
• Chemical Imaging of the CO Snow Line in the HD 163296 Disk
• Molecules with ALMA at Planet-forming Scales (MAPS) IV: Emission Surfaces and Vertical Distribution of Molecules
• On the formation of multiple concentric rings and gaps in protoplanetary disks
• Chemistry of a protoplanetary disk with grain settling and Lyman alpha radiation
• The Ophiuchus DIsc Survey Employing ALMA (ODISEA)-III: the evolution of substructures in massive discs at 3-5 au resolution
• Radiation Hydrodynamical Turbulence In Protoplanetary Disks: Numerical Models and Observational Constraints
• Molecules with ALMA at Planet-forming Scales (MAPS) XIV: Revealing disk substructures in multi-wavelength continuum emission
• Grain Growth in the Circumstellar Disks of the Young Stars CY Tau and DoAr 25
• A Survey of CH3CN and HC3N in Protoplanetary Disks
• ALMA imaging of the CO snowline of the HD 163296 disk with DCO+
• Excess C/O and C/H in outer protoplanetary disk gas
• Sulfur chemistry in protoplanetary disks: CS and H2CS
• Composition of Early Planetary Atmospheres I: Connecting Disk Astrochemistry to the Formation of Planetary Atmospheres
• A Close-up View of the Young Circumbinary Disk HD 142527
• AUTO-MULTITHRESH: A General Purpose Automasking Algorithm
• A survey of C2H, HCN, and C18O in protoplanetary disks
• Bright C2H emission in protoplanetary disks in Lupus: high volatile C/O>1 ratios
• H2CO and N2H+ in Protoplanetary Disks: Evidence for a CO-ice Regulated Chemistry
• A multi-frequency ALMA characterization of substructures in the GM Aur protoplanetary disk
• An ALMA survey of DCN/H${}^{13}$CN and DCO${}^{+}$/H${}^{13}$CO${}^{+}$ in protoplanetary disks
• Dust Evolution Can Produce Scattered Light Gaps in Protoplanetary Disks
• Polarized disk emission from Herbig Ae/Be stars observed using Gemini Planet Imager: HD 144432, HD 150193, HD 163296, and HD 169142
• Double DCO+ rings reveal CO ice desorption in the outer disk around IM Lup
• Protoplanetary Disk Structure With Grain Evolution: the ANDES Model
• Spiral arms in the proto-planetary disc HD100453 detected with ALMA: evidence for binary-disc interaction and a vertical temperature gradient
• Molecules with ALMA at Planet-forming Scales (MAPS). VII. Sub-stellar O/H and C/H and super-stellar C/O in planet feeding gas
• Estimate on dust scale height from ALMA dust continuum image of the HD 163296 protoplanetary disk
• CN rings in full protoplanetary disks around young stars as probes of disk structure
• 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?
• Empirical Temperature Measurement in Protoplanetary Disks
• Multiple Carbon monoxide Snow-lines in Disks Sculpted by Radial Drift
• Inferring giant planets from ALMA millimeter continuum and line observations in (transition) disks
• First evidence of external disc photoevaporation in a low mass star forming region: the case of IM Lup
• 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
• Annular substructures in the transition disks around LkCa 15 and J1610
• Chemistry in Disks. V: CN and HCN in proto-planetary disks
• The Ring Structure in the MWC 480 Disk Revealed by ALMA
• Disk Substructures at High Angular Resolution Program (DSHARP): VIII. The Rich Ringed Substructures in the AS 209 Disk
• 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${}_2$
• An ALMA Survey of H${}_2$CO in Protoplanetary Disks
• A major asymmetric ice trap in a planet-forming disk: I. Formaldehyde and methanol
• Evidence for a CO desorption front in the outer AS 209 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
• The chemical inventory of the planet-hosting disk PDS 70
• The Distribution and Chemistry of H${}_2$CO in the DM Tau Protoplanetary Disk
• Stacking Spectra in Protoplanetary Disks: Detecting Intensity Profiles from Hidden Molecular Lines in HD 163296
• Composition of Early Planetary Atmospheres II: Coupled Dust and Chemical Evolution in Protoplanetary Disks
• DCO${}^{+}$, DCN and N${}_2$D${}^{+}$ reveal three different deuteration regimes in the disk around the Herbig Ae star HD163296
• Differences in the gas and dust distribution in the transitional disk of a sun-like young star, PDS 70
• Molecular line radiative transfer in protoplanetary disks: Monte Carlo simulations versus approximate methods
• Rings and gaps in protoplanetary disks: planets or snowlines?
• A Surface Density Perturbation in the TW Hydrae Disk at 95 au Traced by Molecular Emission
• Molecules with ALMA at Planet-forming Scales (MAPS) XI: CN and HCN as Tracers of Photochemistry in Disks
• Increased H${}_2$CO production in the outer disk around HD 163296
• H2CO distribution and formation in the TW Hya disk
• A highly non-Keplerian protoplanetary disc: Spiral structure in the gas disc of CQ Tau
• Molecules with ALMA at Planet-forming Scales (MAPS) XIII: HCO${}^{+}$ and disk ionization structure
• Gas density perturbations induced by forming planet(s) in the AS 209 protoplanetary disk as seen with ALMA
• A Subarcsecond ALMA Molecular Line Imaging Survey of the Circumbinary, Protoplanetary Disk Orbiting V4046 Sgr
• The role of C/O in nitrile astrochemistry in PDRs and planet-forming disks
• Interpreting high spatial resolution line observations of planet-forming disks with gaps and rings -- The case of HD 163296
• Organic molecules in the protoplanetary disk of DG Tau revealed by ALMA
• The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN
• The TW Hya Rosetta Stone Project II: Spatially resolved emission of formaldehyde hints at low-temperature gas-phase formation
• ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT): I. CO, CS, CN, and H2CO around DG Tau B
• The Excitation Conditions of CN in TW Hya
• Molecules with ALMA at Planet-forming Scales (MAPS). X. Studying deuteration at high angular resolution toward protoplanetary disks
• Chemical Evolution in a Protoplanetary Disk within Planet Carved Gaps and Dust Rings
• 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
• H2CO ortho-to-para ratio in the protoplanetary disk HD 163296
• High Spatial Resolution Observations of Molecular Lines towards the Protoplanetary Disk around TW Hya with ALMA
• The Flared Gas Structure of the Transitional Disk around Sz 91
• Properties of Density and Velocity Gaps Induced by a Planet in a Protoplanetary Disk
• High resolution observations of molecular emission lines toward the CI Tau proto-planetary disc: planet-carved gaps or shadowing?

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• Molecules with ALMA at Planet-forming Scales (MAPS). XV. Tracing protoplanetary disk structure within 20 au