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  No nitrogen fractionation on 600 au scale in the Sun progenitor analogue OMC–2 FIR4

Fontani, F., Quaia, G., Ceccarelli, C., Colzi, L., López-Sepulcre, A., Favre, C., et al. (2020). No nitrogen fractionation on 600 au scale in the Sun progenitor analogue OMC–2 FIR4. Monthly Notices of the Royal Astronomical Society, 493(3), 3412-3421. doi:10.1093/mnras/staa481.

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Fontani, F.1, Author              
Quaia, G, Author
Ceccarelli, C, Author
Colzi, L, Author
López-Sepulcre, A, Author
Favre, C, Author
Kahane, C, Author
Caselli, P.1, Author              
Codella, C, Author
Podio, L, Author
Viti, S, Author
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1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Abstract: We show the first interferometric maps of the 14N/15N ratio obtained with the Atacama Large Millimeter Array (ALMA) towards the Solar-like forming protocluster OMC–2 FIR4. We observed N2H+, 15NNH+, N15NH+ (1–0), and N2D+(2–1) from which we derive the isotopic ratios 14N/15N and D/H. The target, OMC–2 FIR4, is one of the closest analogues of the environment in which our Sun may have formed. The ALMA images, having synthesized beam of ∼1.5 arcsec × 1.8 arcsec, i.e. ∼600 au, show that the emission of the less abundant isotopologues is distributed in several cores of ∼10 arcsec (i.e. ∼0.02 pc or 4000 au) embedded in a more extended N2H+emission. We have derived that the 14N/15N ratio does not vary from core to core, and our interferometric measurements are also consistent with single-dish observations. We also do not find significant differences between the 14N/15N ratios computed from the two 15N-bearing isotopologues, 15NNH+ and N15NH+. The D/H ratio derived by comparing the column densities of N2D+ and N2H+ changes by an order of magnitude from core to core, decreasing from the colder to the warmer cores. Overall, our results indicate that: (1) 14N/15N does not change across the region at core scales, and (2) 14N/15N does not depend on temperature variations. Our findings also suggest that the 14N/15N variations found in pristine Solar system objects are likely not inherited from the protocluster stage, and hence the reason has to be found elsewhere.

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 Dates: 2020-02-20
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa481
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 493 (3) Sequence Number: - Start / End Page: 3412 - 3421 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150