Hydrostatic Equilibrium Does Not Solve the C18O Flux Problem in Protoplanetary Disks

Research Notes of the AAS, vol. 6, pp. 176

Abstract

Abstract ALMA observations have shown that there is discrepancy between the disk mass estimate from CO emission and disk masses estimated from other tracers. This discrepancy has been interpreted as lower than expected CO abundance in the warm, surface layers of the disk. Recent work by Ruaud et al. claims that the low observed C18O fluxes can be explained with a ISM abundance of CO, that is 10−4 w.r.t. H2 by including hydrostatic equilbrium in the model density setup. We show that the Ruaud et al. low CO fluxes are due to an unrealistic temperature structure in the outer disk, due to an interaction of their dust model and hydrostatic equilibrium at their inner model edge. Furthermore, we show with our own modeling that a parametric model does a better job at matching the measured outer disk temperature structure.

Authors 10

1. Arthur D. Bosman

   University of Michigan

   Affiliation as printed

   University of Michigan, LSA astronomy, 1085 S University, Ann Arbor, MI 48109, USA; arbos@umich.edu

   University of Michigan, LSA astronomy, 1085 S University, Ann Arbor, MI 48109, USA

2. Leon Trapman

   University of Wisconsin–Madison

   Affiliation as printed

   Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706, USA

3. J. A. Sturm Aachen Leiden Observatory

   Leiden University · Leiden Observatory

   Affiliation as printed

   Leiden Observatory, Leiden University, P.O. box 9513, 2300 RA Leiden, The Netherlands

4. Edwin A. Bergin

   University of Michigan

   Affiliation as printed

   University of Michigan, LSA astronomy, 1085 S University, Ann Arbor, MI 48109, USA; arbos@umich.edu

   University of Michigan, LSA astronomy, 1085 S University, Ann Arbor, MI 48109, USA

5. Alice S. Booth Aachen Leiden Observatory

   Leiden University · Leiden Observatory

   Affiliation as printed

   Leiden Observatory, Leiden University, P.O. box 9513, 2300 RA Leiden, The Netherlands

6. Jenny K. Calahan

   University of Michigan

   Affiliation as printed

   University of Michigan, LSA astronomy, 1085 S University, Ann Arbor, MI 48109, USA; arbos@umich.edu

   University of Michigan, LSA astronomy, 1085 S University, Ann Arbor, MI 48109, USA

7. Ewine F. van Dishoeck Aachen Leiden Observatory

   Leiden University · Max Planck Institute for Extraterrestrial Physics · Leiden Observatory

   Affiliation as printed

   Leiden Observatory, Leiden University, P.O. box 9513, 2300 RA Leiden, The Netherlands

   Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse 1, D-85748 Garching, Germany

8. Melissa K. McClure Aachen Leiden Observatory

   Leiden University · Leiden Observatory

   Affiliation as printed

   Leiden Observatory, Leiden University, P.O. box 9513, 2300 RA Leiden, The Netherlands

9. Anna Miotello

   European Southern Observatory

   Affiliation as printed

   European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany

10. Ke Zhang

    University of Wisconsin–Madison

    Affiliation as printed

    Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706, USA