CHEMICAL EVOLUTION OF TURBULENT PROTOPLANETARY DISKS AND THE SOLAR NEBULA
- Max Planck Institute for Astronomy, Koenigstuhl 17, D-69117 Heidelberg (Germany)
- Institute of Astronomy of the RAS, Pyatnitskaya St. 48, 119017 Moscow (Russian Federation)
We study the influence of transport processes on the chemical evolution of DM Tau-like protoplanetary disks. Turbulent transport of gases and ices is implicitly modeled in full two dimensions (2D), using the mixing-length approximation, along with the time-dependent chemistry. We find that turbulent transport enhances abundances and column densities of many gas-phase species and ices, particularly, complex ones. The influence of turbulent mixing on disk chemistry is more pronounced in the inner, planet-forming disk region where gradients of temperature and high-energy radiation intensities are steeper than in the outer region. The molecules that are unresponsive to transport include, e.g., C{sub 2}H, C{sup +}, CH{sub 4}, CN, CO, HCN, HNC, H{sub 2}CO, OH, as well as water and ammonia ice. Their column densities computed with the laminar and 2D mixing model differ by a factor of {approx}< 2-5. Molecules whose vertical column densities in the laminar and dynamical models differ by up to two orders of magnitude include, e.g., C{sub 2}H{sub 2}, some carbon chains, CS, H{sub 2}CS, H{sub 2}O, HCO{sup +}, HCOOH, HNCO, N{sub 2}H{sup +}, NH{sub 3}, CO ice, H{sub 2}CO ice, CH{sub 3}OH ice, and electrons. Molecules whose column densities are altered by diffusion by more than two orders of magnitude include, e.g., C{sub 2}S, C{sub 3}S, C{sub 6}H{sub 6}, CO{sub 2}, O{sub 2}, SiO, SO, SO{sub 2}, long carbon chain ices, CH{sub 3}CHO ice, HCOOH ice, O{sub 2} ice, and OCN ice. We indicate several observable or potentially detectable tracers of transport processes in protoplanetary disks and the solar nebula, such as heavy hydrocarbon ices, complex organics, CO{sub 2}, O{sub 2}, SO, SO{sub 2}, C{sub 2}S, C{sub 3}S compared to CO and water ice.
- OSTI ID:
- 21560315
- Journal Information:
- Astrophysical Journal, Supplement Series, Vol. 196, Issue 2; Other Information: DOI: 10.1088/0067-0049/196/2/25; ISSN 0067-0049
- Country of Publication:
- United States
- Language:
- English
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