SIMBAD references

2015ApJ...802L..23F - Astrophys. J., 802, L23 (2015/April-1)

Evidence for DCO+ as a probe of ionization in the warm disk surface.

FAVRE C., BERGIN E.A., CLEEVES L.I., HERSANT F., QI C. and AIKAWA Yu.

Abstract (from CDS):

In this Letter, we model the chemistry of DCO+ in protoplanetary disks. We find that the overall distribution of the DCO+ abundance is qualitatively similar to that of CO but is dominated by a thin layer located at the inner disk surface. To understand its distribution, we investigate the different key gas-phase deuteration pathways that can lead to the formation of DCO+. Our analysis shows that the recent update in the exothermicity of the reaction involving CH2D+ as a parent molecule of DCO+ favors deuterium fractionation in warmer conditions. As a result, the formation of DCO+ is enhanced in the inner warm surface layers of the disk where X-ray ionization occurs. Our analysis points out that DCO+ is not a reliable tracer of the CO snow line as previously suggested. We thus predict that DCO+ is a tracer of active deuterium and, in particular, X-ray ionization of the inner disk.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: abundances - protoplanetary disks - stars: formation

Simbad objects: 7

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2019.12.07-23:38:54

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