The abundance and thermal history of water ice in the disk surrounding HD142527 from the DIGIT Herschel Key Program

Abstract

The presence or absence of ice in protoplanetary disks is of great importance for the formation of planets. By enhancing the solid surface density and increasing the sticking efficiency, ice catalyzes the rapid formation of planetesimals and decreases the time scale for giant planet core accretion. Aims: In this paper we analyse the composition of the outer disk around the Herbig star HD~142527. We focus on the composition of the water ice, but also analyse the abundances of previously proposed minerals. Methods: We present new Herschel far infrared spectra and a re-reduction of archival data from the Infrared Space Observatory (ISO). We model the disk using full 3D radiative transfer to obtain the disk structure. Also, we use an optically thin analysis of the outer disk spectrum to obtain firm constraints on the composition of the dust component. Results: The water ice in the disk around HD~142527 contains a large reservoir of crystalline water ice. We determine the local abundance of water ice in the outer disk (i.e. beyond 130\,AU). The re-reduced ISO spectrum differs significantly from that previously published, but matches the new Herschel spectrum at their common wavelength range. In particular, we do not detect any significant contribution from carbonates or hydrous silicates, in contrast to earlier claims. Conclusions: The amount of water ice detected in the outer disk requires $\sim 80$\% of the oxygen atoms. This is comparable to the water ice abundance in the outer solar system, in comets and in dense interstellar clouds. The water ice is highly crystalline while the temperatures where we detect it are too low to crystallize the water on relevant time scales. We discuss the implications of this finding.

arXiv commentAccepted for publication in A&A

References in corpus (37)

• The chemical composition of the Sun
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• Radiation thermo-chemical models of protoplanetary disks I. Hydrostatic disk structure and inner rim
• Observations of gas flows inside a protoplanetary gap
• Consistent dust and gas models for protoplanetary disks. I. Disk shape, dust settling, opacities, and PAHs
• Modeling optical properties of cosmic dust grains using a distribution of hollow spheres
• A 10 micron spectroscopic survey of Herbig Ae star disks: grain growth and crystallization
• Spectral Energy Distributions of T Tauri and Herbig Ae Disks: Grain Mineralogy, Parameter Dependences, and Comparison with ISO LWS Observations
• Radiative transfer in very optically thick circumstellar disks
• Shadows cast by a warp in the HD 142527 protoplanetary disk
• Structures in the protoplanetary disk of HD142527 seen in polarized scattered light
• The shape and composition of interstellar silicate grains
• The origin of crystalline silicates in the Herbig Be star HD100546 and in comet Hale-Bopp
• A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527
• The thermal structure and the location of the snow line in the protosolar nebula: axisymmetric models with full 3-D radiative transfer
• Dust evolution in protoplanetary disks around Herbig Ae/Be stars - The Spitzer view
• Gas and Dust Emission at the Outer Edge of Protoplanetary Disks
• Identifying gaps in flaring Herbig Ae/Be disks using spatially resolved mid-infrared imaging. Are all group I disks transitional?
• Discovery of H-alpha Emission from the Close Companion Inside the Gap of Transitional Disk HD142527
• Lopsided dust rings in transition disks
• The Inner Rim Structures of Protoplanetary Discs
• The complex circumstellar environment of HD142527
• Spiral arms in the disk of HD 142527 from CO emission lines with ALMA
• A Disk-Wind Model for the Near-Infrared Excess Emission in Protostars
• An M-dwarf star in the transition disk of Herbig HD 142527; Physical parameters and orbital elements
• Near-Infrared Imaging Polarimetry of HD142527
• High Contrast Imaging of the Close Environment of HD 142527 -
• Low abundance, strong features: Window-dressing crystalline forsterite in the disk wall of HD 100546
• Radiation pressure mixing of large dust grains in protoplanetary disks
• Detections of trans-Neptunian ice in protoplanetary disks
• Herschel celestial calibration sources: Four large main-belt asteroids as prime flux calibrators for the far-IR/sub-mm range
• Spatially resolved HCN J=4--3 and CS J=7--6 emission from the disk around HD 142527
• Probing dynamical processes in the planet forming region with dust mineralogy
• Carbonates in space - The challenge of low temperature data
• The CDF Archive: Herschel PACS and SPIRE Spectroscopic Data Pipeline and Products for Protostars and Young Stellar Objects
• Signatures of warm carbon monoxide in protoplanetary discs observed with Herschel SPIRE
• Far-infrared spectra of hydrous silicates at low temperatures - Providing laboratory data for Herschel and ALMA

Cited by in corpus (23)

• Astrochemistry and compositions of planetary systems
• Water in star-forming regions (WISH): Physics and chemistry from clouds to disks as probed by Herschel spectroscopy
• Exploring dust around HD142527 down to 0.025" / 4au using SPHERE/ZIMPOL
• Consistent dust and gas models for protoplanetary disks III. Models for selected objects from the FP7 DIANA project
• Consistent dust and gas models for protoplanetary disks: II. Chemical networks and rates
• Modelling mid-infrared molecular emission lines from T Tauri stars
• Laboratory and Computational Studies of Interstellar Ices
• Temperature programed desorption of water ice from the surface of amorphous carbon and silicate grains as related to planet-forming disks
• Dust continuum emission and the upper limit fluxes of sub-millimeter water lines of the protoplanetary disk around HD 163296 observed by ALMA
• HD142527: Quantitative disk polarimetry with SPHERE
• Herbig Stars: A Quarter Century of Progress
• Simulating Observations of Ices in Protoplanetary Disks
• The nitrogen carrier in protoplanetary disks
• Photodesorption of water ice from dust grains and thermal desorption of cometary ices studied by the INSIDE experiment
• Low temperature optical properties of interstellar and circumstellar icy silicate grain analogues in the mid-infrared spectral region
• The water-ice feature in near-infrared disk-scattered light around HD 142527: Micron-sized icy grains lifted up to the disk surface?
• Warm dust surface chemistry in protoplanetary disks. Formation of phyllosilicates
• New growth mechanism of dust grains in protoplanetary disks with magnetically driven disk winds
• Searching for water ice in the coma of interstellar object 2I/Borisov
• Ices in planet-forming disks: Self-consistent ice opacities in disk models
• Simple molecules and complex chemistry in a protoplanetary disk: A JWST investigation of the highly inclined disk d216-0939
• Diagnostic value of far-IR water ice features in T Tauri disks
• Protoplanetary Disk Chemistry