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SN 2017gmr: An Energetic Type II-P Supernova with Asymmetries

Andrews, JE, Sand, DJ, Valenti, S, Smith, N, Dastidar, R, Sahu, DK, Misra, K, Singh, A, Hiramatsu, D, Brown, PJ, Hosseinzadeh, G, Wyatt, S, Vinko, J, Anupama, GC, Arcavi, I, Ashall, C, Benetti, S, Berton, M, Bostroem, KA, Bulla, M , Burke, J, Chen, S, Chomiuk, L, Cikota, A, Congiu, E, Cseh, B, Davis, S, Elias-Rosa, N, Faran, T, Fraser, M, Galbany, L, Gall, C, Gal-Yam, A, Gangopadhyay, A, Gromadzki, M, Haislip, J, Howell, DA, Hsiao, EY, Inserra, C, Kankare, E, Kuncarayakti, H, Kouprianov, V, Kumar, B, Li, X, Lin, H, Maguire, K, Mazzali, PA, McCully, C, Milne, P, Mo, J, Morrell, N, Nicholl, M, Ochner, P, Olivares, F, Pastorello, A, Patat, F, Phillips, M, Pignata, G, Prentice, S, Reguitti, A, Reichart, DE, Rodriguez, O, Rui, L, Sanwal, P, Sarneczky, K, Shahbandeh, M, Singh, M, Smartt, S, Strader, J, Stritzinger, MD, Szakats, R, Tartaglia, L, Wang, H, Wang, L, Wang, X, Wheeler, JC, Xiang, D, Yaron, O, Young, DR and Zhang, J (2019) SN 2017gmr: An Energetic Type II-P Supernova with Asymmetries. Astrophysical Journal, 885 (1). ISSN 0004-637X

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We present high-cadence UV, optical, and near-infrared data on the luminous Type II-P supernova SN 2017gmr from hours after discovery through the first 180 days. SN 2017gmr does not show signs of narrow, high-ionization emission lines in the early optical spectra, yet the optical light-curve evolution suggests that an extra energy source from circumstellar medium (CSM) interaction must be present for at least 2 days after explosion. Modeling of the early light curve indicates a ~500 R ⊙ progenitor radius, consistent with a rather compact red supergiant, and late-time luminosities indicate that up to 0.130 ± 0.026 M ⊙ of 56Ni are present, if the light curve is solely powered by radioactive decay, although the 56Ni mass may be lower if CSM interaction contributes to the post-plateau luminosity. Prominent multipeaked emission lines of Hα and [O i] emerge after day 154, as a result of either an asymmetric explosion or asymmetries in the CSM. The lack of narrow lines within the first 2 days of explosion in the likely presence of CSM interaction may be an example of close, dense, asymmetric CSM that is quickly enveloped by the spherical supernova ejecta.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, 0306 Physical Chemistry (incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
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Date Deposited: 06 Jan 2020 10:31
Last Modified: 04 Sep 2021 08:14
DOI or ID number: 10.3847/1538-4357/ab43e3
URI: https://researchonline.ljmu.ac.uk/id/eprint/11943
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