4-8 October 2015
Hans Harnack Haus
Europe/Berlin timezone
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Contribution Contributed Talk

Hans Harnack Haus -

Deuterium and 15-N fractionation in protoplanetary disks


  • Prof. Karin ÖBERG

Primary authors



Isotopic fractionation patterns is a popular tool to date Solar System and interstellar material. Nitrogen and hydrogen fractionation, i.e. the enhancement of deuterium and $^{15}$N in molecules, are both expected to be efficient at the low temperatures found in pre-stellar cores an protoplanetary disk midplanes. These enhancements can survive the warmer phases of star and planet formation, maintaining a record of the environment where the molecules first formed. In ALMA Cycle 2, we carried out a survey of deuterated molecules in protoplanetary disks with the aim to establish a direct link between interstellar and Solar System deuterium fractionation. In addition to spatially resolving the distributions of several deuterated molecules and their non-deuterated analogs, we also detected $^{15}$N-bearing molecules in disks for the first time. I will present the results of this survey and the constraints it places on the deuterium and nitrogen fractionation chemistry in protoplanetary disks. Highlights include the discovery of a spectacular DCO$^+$ double-ring around the T Tauri star IM Lup, and of cometary $^{15}$N/$^{14}$N ratios in HCN in the disk around MWC 480.