2017ApJ...836...30G


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET18:26:51

2017ApJ...836...30G - Astrophys. J., 836, 30-30 (2017/February-2)

Nitrogen fractionation in protoplanetary disks from the H13CN/HC15N ratio.

GUZMAN V.V., OBERG K.I., HUANG J., LOOMIS R. and QI C.

Abstract (from CDS):

Nitrogen fractionation is commonly used to assess the thermal history of solar system volatiles. With ALMA it is for the first time possible to directly measure 14N/15N ratios in common molecules during the assembly of planetary systems. We present ALMA observations of the H13CN and HC15NJ=3-2 lines at 0.''5 angular resolution, toward a sample of six protoplanetary disks, selected to span a range of stellar and disk structure properties. Adopting a typical 12C/13C ratio of 70, we find comet-like 14N/15N ratios of 80-160 in five of the disks (3 T Tauri and 2 Herbig Ae disks) and lack constraints for one of the T Tauri disks (IM Lup). There are no systematic differences between T Tauri and Herbig Ae disks, or between full and transition disks within the sample. In addition, no correlation is observed between disk-averaged D/H and 14N/15N ratios in the sample. One of the disks, V4046 Sgr, presents unusually bright HCN isotopologue emission, enabling us to model the radial profiles of H13CN and HC15N. We find tentative evidence of an increasing 14N/15N ratio with radius, indicating that selective photodissociation in the inner disk is important in setting the 14N/15N ratio during planet formation.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrochemistry - ISM: molecules - protoplanetary disks - radio lines: ISM - radio lines: ISM

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 151 0
2 NAME [BM89] L1521E DNe 04 29 21.0 +26 14 19           ~ 83 1
3 EM* LkCa 15 TT* 04 39 17.7912813350 +22 21 03.387667491   13.01 12.03 11.61   K5:Ve 535 1
4 HD 31648 Ae* 04 58 46.2654165113 +29 50 36.990341242 7.84 7.78 7.62 7.76 7.43 A5Vep 383 0
5 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 661 0
6 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 675 1
7 THA 15-12 TT* 15 56 09.2067120748 -37 56 06.126159332   13.12 11.93 11.45   M0e 225 0
8 EM* AS 209 TT* 16 49 15.3035547820 -14 22 08.642015783   12.62 11.28     K4Ve 215 0
9 HD 163206 * 17 55 09.3019288807 -01 43 46.563332485   8.86 8.53     A5II 3 0
10 HD 163296 Ae* 17 56 21.2882188601 -21 57 21.872343282 7.00 6.93 6.85 6.86 6.67 A1Vep 753 0
11 HD 319139 BY* 18 14 10.4818974563 -32 47 34.516106830   11.47 10.68   9.11 K5+K7 280 0

    Equat.    Gal    SGal    Ecl

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2020.01.28-18:26:51

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