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  The early discovery of SN 2017ahn: signatures of persistent interaction in a fast declining Type II supernova

Tartaglia, L., Sand, D. J., Groh, J. H., Valenti, S., Wyatt, S. D., Bostroem, K. A., et al. (2021). The early discovery of SN 2017ahn: signatures of persistent interaction in a fast declining Type II supernova. The Astrophysical Journal, 907(1): 52. doi:10.3847/1538-4357/abca8a.

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Tartaglia, L., Author
Sand, D. J., Author
Groh, J. H., Author
Valenti, S., Author
Wyatt, S. D., Author
Bostroem, K. A., Author
Brown, P. J., Author
Yang, S., Author
Burke, J., Author
Chen, T.-W.1, Author              
Davis, S., Author
Förster, F., Author
Galbany, L., Author
Haislip, J., Author
Hiramatsu, D., Author
Hosseinzadeh, G., Author
Howell, D. A., Author
Hsiao, E. Y., Author
Jha, S. W., Author
Kouprianov, V., Author
Kuncarayakti, H., AuthorLyman, J. D., AuthorMcCully, C., AuthorPhillips, M. M., AuthorRau, A.1, Author              Reichart, D. E., AuthorShahbandeh, M., AuthorStrader, J., Author more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: We present high-cadence, comprehensive data on the nearby (D ≃ 33 Mpc) Type II supernova (SN II) 2017ahn, discovered within about one day of the explosion, from the very early phases after explosion to the nebular phase. The observables of SN 2017ahn show a significant evolution over the ≃470 days of our follow-up campaign, first showing prominent, narrow Balmer lines and other high-ionization features purely in emission (i.e., flash spectroscopy features), which progressively fade and lead to a spectroscopic evolution similar to that of more canonical SNe II. Over the same period, the decline of the light curves in all bands is fast, resembling the photometric evolution of linearly declining H-rich core-collapse SNe. The modeling of the light curves and early flash spectra suggests that a complex circumstellar medium surrounds the progenitor star at the time of explosion, with a first dense shell produced during the very late stages of its evolution that is swept up by the rapidly expanding ejecta within the first ~6 days of the SN evolution, while signatures of interaction are observed also at later phases. Hydrodynamical models support the scenario in which linearly declining SNe II are predicted to arise from massive yellow super- or hypergiants depleted of most of their hydrogen layers.

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 Dates: 2021-01-28
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/abca8a
Other: LOCALID: 3289729
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 907 (1) Sequence Number: 52 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3