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A Photoionization Model for the Infrared Coronal Line Emission in the Classical Nova V1716 Scorpii

Woodward, C. E.; Shaw, G.; Starrfield, S.; Evans, A.; Page, K. L.

Authors

C. E. Woodward

G. Shaw

S. Starrfield

A. Evans

K. L. Page



Abstract

A near-infrared spectrum of nova V1716 Scorpii (PNV J17224490-4137160), a recent bright ( Vmax=7.3 mag), Fermi-LAT detected γ-ray source, was modeled using the photoionization code CLOUDY. Abundances were estimated for He, C, N, O, Si, Al, Mg, Fe, Ne, S, Ca, and P. Notably, P (a factor of 120) and N (a factor of 248) are highly overabundant. It was necessary to assume the ejecta consist of two components (with a cylindrical geometry): a dense component from which the bulk of the H, He, and neutral O i and N emission arises and a more diffuse component from which most of the coronal lines arise. Some of the coronal lines are found to originate from both the dense and diffuse components. The mass of the ejecta, including neutral and ionized gas, is ≃4.19 × 10−4 M ⊙. Our analysis indicates that in the case of V1716 Sco (which has a carbon–oxygen white dwarf), a fraction of 25% white dwarf matter rather than 50% is favored for the mixing between a white dwarf and the accreted envelope before the outburst. This mixing ratio is like that found for oxygen–neon novae where a 25% mixing fraction is also indicated. Helium hydride—the first molecule to form after the Big Bang—may have formed in the ejecta of V1716 Sco based on photoionization modeling. This prediction suggests that novae may be potential formation sites of this important molecular ion.

Citation

Woodward, C. E., Shaw, G., Starrfield, S., Evans, A., & Page, K. L. (2024). A Photoionization Model for the Infrared Coronal Line Emission in the Classical Nova V1716 Scorpii. Astrophysical Journal, 968(1), Article 31. https://doi.org/10.3847/1538-4357/ad4097

Journal Article Type Article
Acceptance Date Apr 17, 2024
Online Publication Date Jun 6, 2024
Publication Date Jun 1, 2024
Deposit Date Jun 11, 2024
Publicly Available Date Jun 11, 2024
Journal The Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 968
Issue 1
Article Number 31
DOI https://doi.org/10.3847/1538-4357/ad4097
Keywords Chemical enrichment, Explosive nucleosynthesis, Chemical abundances, Fast novae
Public URL https://keele-repository.worktribe.com/output/847669

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Licence
https://creativecommons.org/licenses/by/4.0/

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Copyright Statement
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.






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