WATER IN PROTOPLANETARY DISKS: DEUTERATION AND TURBULENT MIXING

@article{Furuya2013WATERIP,
  title={WATER IN PROTOPLANETARY DISKS: DEUTERATION AND TURBULENT MIXING},
  author={Kenji Furuya and Yuri Aikawa and Hideko Nomura and Franck Hersant and Valentine Wakelam},
  journal={The Astrophysical Journal},
  year={2013},
  volume={779}
}
We investigate water and deuterated water chemistry in turbulent protoplanetary disks. Chemical rate equations are solved with the diffusion term, mimicking turbulent mixing in a vertical direction. Water near the midplane is transported to the disk atmosphere by turbulence and is destroyed by photoreactions to produce atomic oxygen, while the atomic oxygen is transported to the midplane and reforms water and/or other molecules. We find that this cycle significantly decreases column densities… 

REPROCESSING OF ICES IN TURBULENT PROTOPLANETARY DISKS: CARBON AND NITROGEN CHEMISTRY

We study the influence of the turbulent transport on ice chemistry in protoplanetary disks, focusing on carbon- and nitrogen-bearing molecules. Chemical rate equations are solved with the diffusion

Multiple Paths of Deuterium Fractionation in Protoplanetary Disks

We investigate deuterium chemistry coupled with the nuclear spin-state chemistry of H2 and in protoplanetary disks. Multiple paths of deuterium fractionation are found; exchange reactions with D

WATER VAPOR DISTRIBUTION IN PROTOPLANETARY DISKS

Water vapor has been detected in protoplanetary disks. In this work, we model the distribution of water vapor in protoplanetary disks with a thermo-chemical code. For a set of parameterized disk

Astrochemical models of water

  • Y. Aikawa
  • Physics, Geology
    Proceedings of the International Astronomical Union
  • 2015
Abstract We will review the chemical reaction network models of water and its D/H ratio coupled with the dynamics of star formation. Infrared observations show that water ice is abundant even in

Water delivery from cores to disks: deuteration as a probe of the prestellar inheritance of H2O

We investigate the delivery of regular and deuterated forms of water from prestellar cores to circumstellar disks. We adopt a semi-analytical axisymmetric two-dimensional collapsing core model with

SNOW LINES AS PROBES OF TURBULENT DIFFUSION IN PROTOPLANETARY DISKS

Sharp chemical discontinuities can occur in protoplanetary disks, particularly at “snow lines” where a gas-phase species freezes out to form ice grains. Such sharp discontinuities will diffuse out

CHEMODYNAMICAL DEUTERIUM FRACTIONATION IN THE EARLY SOLAR NEBULA: THE ORIGIN OF WATER ON EARTH AND IN ASTEROIDS AND COMETS

Formation and evolution of water in the solar system and the origin of water on Earth constitute one of the most interesting questions in astronomy. The prevailing hypothesis for the origin of water

Chemical fractionation of deuterium in the protosolar nebula

Understanding gas-grain chemistry of deuterium in star-forming objects may help to explain their history and present state. We aim to clarify how processes in ices affect the deuterium fractionation.

Chemical Network Reduction in Protoplanetary Disks

Protoplanetary disks (PPDs) are characterized by different kinds of gas dynamics and chemistry, which are coupled via ionization, heating, and cooling processes, as well as advective and turbulent

Chemistry Along Accretion Streams in a Viscously Evolving Protoplanetary Disk

The composition of a protoplanetary disk is set by a combination of interstellar inheritance and gas and grain surface chemical reactions within the disk. The survival of inherited molecules, as well
...

References

SHOWING 1-10 OF 136 REFERENCES

CHEMICAL EVOLUTION OF TURBULENT PROTOPLANETARY DISKS AND THE SOLAR NEBULA

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),

Turbulence-driven Diffusion in Protoplanetary Disks: Chemical Effects in the Outer Regions

The chemistry and dynamics of protoplanetary disks are likely to be intricately linked, with dynamical processes affecting the chemical composition and chemistry, in turn, controlling the ionization

FORMATION OF WATER IN THE WARM ATMOSPHERES OF PROTOPLANETARY DISKS

The gas-phase chemistry of water in protoplanetary disks is analyzed with a model based on X-ray heating and ionization of the disk atmosphere. Several uncertain processes appear to play critical

Discovery of Deuterated Water in a Young Protoplanetary Disk

We report the first detection of the ground transition of deuterated water at 464 GHz in the young protoplanetary disk surrounding the solar-type protostar DM Tau. The line is observed in absorption

Deuterium Fractionation in Protoplanetary Disks

We investigate the chemistry of deuterium-bearing molecules in outer regions of protoplanetary disks, where comets may form. We find that molecules formed in the disk have higher D/H ratios (by which

CHEMICAL EVOLUTION OF PROTOPLANETARY DISKS—THE EFFECTS OF VISCOUS ACCRETION, TURBULENT MIXING, AND DISK WINDS

We calculate the chemical evolution of protoplanetary disks considering radial viscous accretion, vertical turbulent mixing, and vertical disk winds. We study the effects on the disk chemical

Discovery of deuterated water in a young proto-planetary disk

We report the first detection of the ground transition of the deuterated water at 464 GHz in the young proto-planetary disk surrounding the solar type protostar DM Tau. The line is observed in

Gas-Phase Water in the Surface Layer of Protoplanetary Disks

Recent observations of the ground-state transition of HDO at 464 GHz toward the protoplanetary disk of DM Tau have detected the presence of water vapor in the regions just above the outer disk

The Chemistry of Multiply Deuterated Molecules in Protoplanetary Disks. I. The Outer Disk

We present new models of the deuterium chemistry in protoplanetary disks, including, for the first time, multiply deuterated species. We use these models to explore whether observations in
...