Protoplanetary disk masses from CO isotopologues line emission

Abstract

One of the methods for deriving disk masses relies on direct observations of the gas, whose bulk mass is in the outer cold ($T\lesssim 30$K) regions. This zone can be well traced by rotational lines of less abundant CO isotopologues, that probe the gas down to the midplane. The total CO gas mass is then obtained with the isotopologue ratios taken to be constant at the elemental isotope values found in the local ISM. This approach is however imprecise, because isotope selective processes are ignored. The aim of this work is an isotopologue selective treatment of CO isotopologues, in order to obtain a more accurate determination of disk masses. The isotope-selective photodissociation, the main process controlling the abundances of CO isotopologues in the CO-emissive layer, is properly treated for the first time in a full disk model (DALI, Bruderer et al. 2012; Bruderer 2013). The chemistry, thermal balance, line and continuum radiative transfer are all considered together with a chemical network that treats ${}^{13}$CO, C${}^{18}$O, C${}^{17}$O, isotopes of all included atoms, and molecules, as independent species. Isotope selective processes lead to regions in the disk where the isotopologues abundance ratios are considerably different from the elemental ratio. The results of this work show that considering CO isotopologue ratios as constants can lead to an underestimate of disk masses by up to almost two orders of magnitude if grains have grown to larger sizes. This may explain observed discrepancies in mass determinations from different tracers. The dependence of the various isotopologues emission on stellar and disk parameters is investigated. Including CO isotope selective processes is crucial to determine the gas mass of the disk accurately (through ALMA observations) and thus to provide the amount of gas which may eventually form planets or change the dynamics of forming planetary systems.

arXiv commentAccepted for publication in A&A, 16 pages, 10 figures, 4 tables

References in corpus (48)

• Validation of the new Hipparcos reduction
• Protoplanetary Disks and Their Evolution
• The effects of snowlines on C/O in planetary atmospheres
• Circumstellar Dust Disks in Taurus-Auriga: The Submillimeter Perspective
• A simple model for the evolution of the dust population in protoplanetary disks
• Resolved Images of Large Cavities in Protoplanetary Transition Disks
• A Major Asymmetric Dust Trap in a Transition Disk
• The photodissociation and chemistry of CO isotopologues: applications to interstellar clouds and circumstellar disks
• Dynamics of Protoplanetary Disks
• Effects of Dust Growth and Settling in T Tauri Disks
• Dust Properties of Protoplanetary Disks in the Taurus-Auriga Star Forming Region from Millimeter Wavelengths
• An Old Disk That Can Still Form a Planetary System
• A dual-frequency sub-arcsecond study of proto-planetary disks at mm wavelengths: First evidence for radial variations of the dust properties
• The ancient heritage of water ice in the solar system
• The TW Hya Disk at 870 microns: Comparison of CO and Dust Radial Structures
• A Parametric Modeling Approach to Measuring the Gas Masses of Circumstellar Disks
• The warm gas atmosphere of the HD 100546 disk seen by Herschel (Evidence of a gas-rich, carbon-poor atmosphere?)
• Spectro-astrometric imaging of molecular gas within protoplanetary disk gaps
• Photoprocesses in protoplanetary disks
• Constraints on the Radial Variation of Grain Growth in the AS 209 Circumstellar Disk
• Large dust particles in disks around T Tauri stars
• Survival of molecular gas in cavities of transition disks (I. CO)
• CO emission from discs around isolated HAeBe and Vega-excess stars
• Large grains in the disk of CQ Tau
• Desorption rates and sticking coefficients for CO and N2 interstellar ices
• A Significantly Low CO Abundance Toward the TW Hya Protoplanetary Disk: A Path to Active Carbon Chemistry?
• Submillimeter lines from circumstellar disks around pre-main sequence stars
• Gas structure inside dust cavities of transition disks: Oph IRS 48 observed by ALMA
• Formation and Evolution of Planetary Systems: Upper Limits to the Gas Mass in Disks Around Sun-like Stars
• ALMA observations of the molecular gas in the debris disk of the 30 Myr old star HD 21997
• ALMA hints at the presence of two companions in the disk around HD 100546
• VLT-CRIRES Survey of Rovibrational CO Emission from Protoplanetary Disks
• Carbon isotope fractionation in protoplanetary disks
• Physical and Chemical Structure of Protoplanetary Disks with Grain Growth
• The gas temperature in flaring disks around pre-main sequence stars
• Emission Lines from the Gas Disk around TW Hydra and the Origin of the Inner Hole
• The Atomic and Molecular Content of Disks Around Very Low-mass Stars and Brown Dwarfs
• Tracing the inner edge of the disk around HD 100546 with Ro-vibrational CO Emission Lines
• Deuterium chemistry in protoplanetary disks II The inner 30 AU
• Evidence for CO depletion in the inner regions of gas-rich protoplanetary disks
• Observational Constraints on Submillimeter Dust Opacity
• Exploring the Origins of Carbon in Terrestrial Worlds
• Carbon Fractionation in PDRs
• Large grains in disks around young stars: ATCA observations of WW Cha, RU Lup, and CS Cha
• A Search for Mid-Infrared Molecular Hydrogen Emission from Protoplanetary Disks
• The TEXES Survey For H2 Emission From Protoplanetary Disks
• Quiescent H2 Emission From Pre-Main Sequence Stars in Chamaeleon I
• Probing the radial temperature structure of protoplanetary disks with Herschel/HIFI

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