The depletion of water during dispersal of planet-forming disk regions

Abstract

We present a new velocity-resolved survey of 2.9 $\mu$m spectra of hot H${}_2$O and OH gas emission from protoplanetary disks, obtained with CRIRES at the VLT ($\Delta v\sim$ 3 km s${}^{-1}$). With the addition of archival Spitzer-IRS spectra, this is the most comprehensive spectral dataset of water vapor emission from disks ever assembled. We provide line fluxes at 2.9-33 $\mu$m that probe from disk radii of $\sim 0.05$ au out to the region across the water snow line. With a combined dataset for 55 disks, we find a new correlation between H${}_2$O line fluxes and the radius of CO gas emission as measured in velocity-resolved 4.7 $\mu$m spectra (R${}_{\mathrm{co}}$), which probes molecular gaps in inner disks. We find that H${}_2$O emission disappears from 2.9 $\mu$m (hotter water) to 33 $\mu$m (colder water) as R${}_{\mathrm{co}}$ increases and expands out to the snow line radius. These results suggest that the infrared water spectrum is a tracer of inside-out water depletion within the snow line. It also helps clarifying an unsolved discrepancy between water observations and models, by finding that disks around stars of M${}_{\star }>1.5$ M${}_{\odot }$ generally have inner gaps with depleted molecular gas content. We measure radial trends in H${}_2$O, OH, and CO line fluxes that can be used as benchmarks for models to study the chemical composition and evolution of planet-forming disk regions at 0.05-20 au. We propose that JWST spectroscopy of molecular gas may be used as a probe of inner disk gas depletion, complementary to the larger gaps and holes detected by direct imaging and by ALMA.

arXiv commentAccepted for publication on ApJ

References in corpus (88)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Spitzer Space Telescope Mission
• Disk Frequencies and Lifetimes in Young Clusters
• The Infrared Spectrograph on the Spitzer Space Telescope
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• Planet-disk interaction and orbital evolution
• Resolved Images of Large Cavities in Protoplanetary Transition Disks
• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
• Observational Constraints on the Formation and Evolution of Binary Stars
• Planet formation around stars of various masses: The snow line and the frequency of giant planets
• Towards a deterministic model of planetary formation. III. Mass distribution of short-period planets around stars of various masses
• Building Terrestrial Planets
• Photoevaporation of protoplanetary discs II: evolutionary models and observable properties
• Radiation thermo-chemical models of protoplanetary disks I. Hydrostatic disk structure and inner rim
• Photoevaporation of Circumstellar Disks by FUV, EUV and X-ray Radiation from the Central Star
• Consistent dust and gas models for protoplanetary disks. I. Disk shape, dust settling, opacities, and PAHs
• Radiation-Hydrodynamic Models of X-Ray & EUV Photoevaporating Protoplanetary Discs
• Which jet launching mechanism(s) in TTauri stars?
• Interstellar water chemistry: from laboratory to observations
• Detection of the Water Reservoir in a Forming Planetary System
• Observational Signatures of Planets in Protoplanetary Disks I: Gaps Opened by Single and Multiple Young Planets in Disks
• Protoplanetary disk lifetimes vs stellar mass and possible implications for giant planet populations
• Transitional and Pre-Transitional disks: Gap Opening by Multiple Planets?
• TEXES: A Sensitive High-Resolution Grating Spectrograph for the Mid-Infrared
• Spectro-astrometric imaging of molecular gas within protoplanetary disk gaps
• H2O and OH gas in the terrestrial planet-forming zones of protoplanetary disks
• Accretion Rates for T Tauri Stars Using Nearly Simultaneous Ultraviolet and Optical Spectra
• A Spitzer survey of mid-infrared molecular emission from protoplanetary disks I: Detection rates
• A spectroscopic survey of Herbig Ae/Be stars with X-Shooter I: Stellar parameters and accretion rates
• Resolved gas cavities in transitional disks inferred from CO isotopologues with ALMA
• Survival of molecular gas in cavities of transition disks (I. CO)
• Towards a Global Evolutionary Model of Protoplanetary Disks
• Dust Migration and Morphology in Optically Thin Circumstellar Gas Disks
• A Spitzer Survey of Mid-Infrared Molecular Emission from Protoplanetary Disks II: Correlations and LTE Models
• The molecular composition of the planet-forming regions of protoplanetary disks across the luminosity regime
• The structure and dynamics of molecular gas in planet-forming zones: A CRIRES spectro-astrometric survey
• The thermal structure and the location of the snow line in the protosolar nebula: axisymmetric models with full 3-D radiative transfer
• Small vs large dust grains in transitional disks: do different cavity sizes indicate a planet?
• On the gas content of transitional disks: a VLT/X-Shooter study of accretion and winds
• Investigating planet formation in circumstellar disks: CARMA observations of RY Tau and DG Tau
• The Impact of Dust Evolution and Photoevaporation on Disk Dispersal
• Warm Gas in the Inner Disks around Young Intermediate Mass Stars
• Hot H2O Emission and Evidence for Turbulence in the Disk of a Young Star
• Identifying gaps in flaring Herbig Ae/Be disks using spatially resolved mid-infrared imaging. Are all group I disks transitional?
• X-Shooter study of accretion in Chamaeleon I
• Radiative transfer models of mid-infrared H2O lines in the Planet-forming Region of Circumstellar Disks
• Organic Molecules and Water in the Inner Disks of T Tauri Stars
• Tracing Slow Winds from T Tauri Stars via Low Velocity Forbidden Line Emission
• VLT-CRIRES Survey of Rovibrational CO Emission from Protoplanetary Disks
• Measuring Protoplanetary Disk Accretion with H I Pf-beta
• CO rovibrational emission as a probe of inner disk structure
• On the Transitional Disk Class: Linking Observations of T Tauri Stars & Physical Disk Models
• Non-stationary dynamo & magnetospheric accretion processes of the classical T Tauri star V2129 Oph
• DIGIT survey of far-infrared lines from protoplanetary disks I
• Evidence for a Snow Line Beyond the Transitional Radius in the TW Hya Protoplanetary Disk
• The Atomic and Molecular Content of Disks Around Very Low-mass Stars and Brown Dwarfs
• Single peaked CO emission line profiles from the inner regions of protoplanetary disks
• The structure of disks around intermediate-mass young stars from mid-infrared interferometry. Evidence for a population of group II disks with gaps
• Spitzer Spectroscopy of the Transition Object TW Hya
• The 2008 extreme outburst of the young eruptive variable star Ex Lupi
• Spectrally resolved pure rotational lines of water in protoplanetary disks
• Formation of Organic Molecules and Water in Warm Disk Atmospheres
• Accretion dynamics in the classical T Tauri star V2129 Oph
• An empirical sequence of disk gap opening revealed by rovibrational CO
• Probing stellar accretion with mid-infrared hydrogen lines
• Water depletion in the disk atmosphere of Herbig AeBe stars
• Radiation thermo-chemical models of protoplanetary discs. IV Modelling CO ro-vibrational emission from Herbig Ae discs
• The origin and evolution of transition discs: successes, problems and open questions
• First Detection of Near-Infrared Line Emission from Organics in Young Circumstellar Disks
• Ex Lupi from Quiescence to Outburst: Exploring the LTE Approach in Modelling Blended H2O and OH Mid-Infrared Emission
• Detection of warm water vapour in Taurus protoplanetary discs by Herschel
• Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow
• Measurements of water surface snow lines in classical protoplanetary disks
• The structure of disks around Herbig Ae/Be stars as traced by CO ro-vibrational emission
• Disks and Outflows in CO Rovibrational Emission from Embedded, Low-Mass Young Stellar Objects
• Discovery of OH in Circumstellar Disks Around Young Intermediate-Mass Stars
• Warm H2O and OH in the disk around the Herbig star HD 163296
• Understanding the water emission in the mid- and far-IR from protoplanetary disks around T~Tauri stars
• Candidate Water Vapor Lines to Locate the H${}_2$O Snowline through High-Dispersion Spectroscopic Observations I. The Case of a T Tauri Star
• Depletion of molecular gas by an accretion outburst in a protoplanetary disk
• Mid-IR spectra of Pre-Main Sequence Herbig stars: an explanation for the non-detections of water lines
• Herschel-PACS observations of far-IR lines in YSOs I: [OI] and H2O at 63 microns
• The Evolution of Inner Disk Gas in Transition Disks
• A UV-to-MIR monitoring of DR Tau: exploring how water vapor in the planet formation region of the disk is affected by stellar accretion variability
• Detection of water vapor in the terrestrial planet forming region of a transition disk
• A proposed new diagnostic for Herbig disc geometry: FWHM versus J of CO ro-vibrational lines
• Herschel -PACS observations of [OI] and H2O in Cha II
• A Study of Ro-vibrational OH Emission from Herbig Ae/Be Stars

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• Consistent dust and gas models for protoplanetary disks IV. A panchromatic view of protoplanetary disks
• Chemical Evolution in a Protoplanetary Disk within Planet Carved Gaps and Dust Rings
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• The dry and carbon poor inner disk of TW Hya: evidence for a massive icy dust trap
• Probing planet formation and disk substructures in the inner disk of Herbig Ae stars with CO rovibrational emission
• OH mid-infrared emission as a diagnostic of H${}_2$O UV photodissociation. III. Application to planet-forming disks
• Candidate Water Vapor Lines to Locate the ${\mathrm{H}}_2\mathrm{O}$ Snowline through High-dispersion Spectroscopic Observations. III. Submillimeter ${\mathrm{H}}_2$${}^{16}\mathrm{O}$ and ${\mathrm{H}}_2$${}^{18}\mathrm{O}$ Lines
• A UV-to-NIR Study of Molecular Gas in the Dust Cavity Around RY Lupi
• H${}_2$O distribution in the disc of HD 100546 and HD 163296: the role of dust dynamics and planet--disc interaction
• CLIcK: a Continuum and Line fItting Kit for circumstellar disks
• Reimagining the water snowline
• A model exploration of NIR ro-vibrational CO emission as a tracer of inner cavities in protoplanetary disks
• XUE. JWST spectroscopy of externally irradiated disks around young intermediate-mass stars
• Water and OH Emission from the inner disk of a Herbig Ae/Be star
• An unusual reservoir of water emission in the VV CrA A protoplanetary disk
• Gas kinematics of key prebiotic molecules in GV Tau N revealed with an ALMA, PdBI, and Herschel synergy
• Water vapor emission at the warm cavity wall of the HD 100546 disk as revealed by ALMA
• Evidence of a Disk-wind Origin for Fluorescent H${}_2$ in Classical T Tauri Stars
• Molecules with ALMA at Planet-forming Scales (MAPS). XV. Tracing protoplanetary disk structure within 20 au
• How leaky? A large parameter study of leaky dust traps to quantify the transport of pebbles and ice in protoplanetary discs
• The formation of planetary systems with SPICA
• Molecular Similarity and Water Diversity in Coeval Binary Disks: JWST/MIRI Observations of Sz 65 and Sz 66
• Linking Outer Disk Pebble Dynamics and Gaps to Inner Disk Water Enrichment