Rotational Line Emission from Water in Protoplanetary Disks

Abstract

Circumstellar disks provide the material reservoir for the growth of young stars and for planet formation. We combine a high-level radiative transfer program with a thermal-chemical model of a typical T Tauri star disk to investigate the diagnostic potential of the far-infrared lines of water for probing disk structure. We discuss the observability of pure rotational H2O lines with the Herschel Space Observatory, specifically the residual gas where water is mainly frozen out. We find that measuring both the line profile of the ground 110-101 ortho-H2O transition and the ratio of this line to the 312-303 and 221-212 line can provide information on the gas phase water between 5-100 AU, but not on the snow line which is expected to occur at smaller radii.

5 pages, 4 figures. Accepted by ApJL

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Cited by in corpus (13)

• A Spitzer survey of mid-infrared molecular emission from protoplanetary disks I: Detection rates
• A Spitzer Survey of Mid-Infrared Molecular Emission from Protoplanetary Disks II: Correlations and LTE Models
• Radiative transfer models of mid-infrared H2O lines in the Planet-forming Region of Circumstellar Disks
• First Detection of Near-Infrared Line Emission from Organics in Young Circumstellar Disks
• Hot and cool water in Herbig Ae protoplanetary disks. A challenge for Herschel
• 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 II. The Case of a Herbig Ae Star
• Candidate Water Vapor Lines to Locate the H${}_2$O Snowline through High-Dispersion Spectroscopic Observations I. The Case of a T Tauri Star
• A new raytracer for modeling AU-scale imaging of lines from protoplanetary disks
• Spectral signatures of disk eccentricity in young binary systems: I. Circumprimary case
• Rotational quenching of rotationally-excited H${}_2$O in collisions with He
• Detectability of giant planets in protoplanetary disks by CO emission lines
• 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