SIMBAD references

2019ApJ...876L..13S - Astrophys. J., 876, L13-L13 (2019/May-1)

Line ratios reveal N2H+ emission originates above the midplane in TW Hydrae.

SCHWARZ K.R., TEAGUE R. and BERGIN E.A.

Abstract (from CDS):

Line ratios for different transitions of the same molecule have long been used as a probe of gas temperature. Here we use ALMA observations of the N2H+ J = 1-0 and J = 4-3 lines in the protoplanetary disk around TW Hya to derive the temperature at which these lines emit. We find an averaged temperature of 39 K with a 1σ uncertainty of 2 K for the radial range 0.''8-2'', which is significantly warmer than the expected midplane temperature beyond 0.''5 in this disk. We conclude that the N2H+ emission in TW Hya is not emitting from near the midplane, but rather from higher in the disk, in a region likely bounded by processes such as photodissociation or chemical reprocessing of CO and N2 rather than freeze-out.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrochemistry - ISM: molecules - protoplanetary disks - techniques: interferometric

Errata: erratum vol. 881, art. L44, 2019

Simbad objects: 4

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2019.12.14-01:12:40

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