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Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068

Bostroem, KA and Valenti, S and Sand, DJ and Andrews, JE and Van Dyk, S.D and Galbany, L and Pooley, D and Amaro, RC and Smith, N and Yang, S and Anupama, GC and Arcavi, I and Baron, E and Brown, PJ and Burke, J and Cartier, R and Hiramatsu, D and Dastidar, R and Derkacy, JM and Dong, Y and Egami, E and Ertel, S and Filippenko, AV and Fox, OD and Haislip, J and Hosseinzadeh, G and Howell, DA and Gangopadhyay, A and Jha, SW and Kouprianov, V and Kumar, B and Lundquist, M and Milisavljevic, D and McCully, C and Milne, P and Misra, K and Reichart, DE and Sahu, DK and Sai, H and Singh, A and Smith, PS and Vinko, J and Wang, X and Wang, Y and Wheeler, JC and Williams, GG and Wyatt, S and Zhang, J and Zhang, X (2020) Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068. In: Astrophysical Journal, 895 (1).

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Official URL: https://dx.doi.org/10.3847/1538-4357/ab8945


We present the discovery and high-cadence follow-up observations of SN 2018ivc, an unusual SNe II that exploded in NGC 1068 (D = 10.1 Mpc). The light curve of SN 2018ivc declines piecewise-linearly, changing slope frequently, with four clear slope changes in the first 30 days of evolution. This rapidly changing light curve indicates that interaction between the circumstellar material and ejecta plays a significant role in the evolution. Circumstellar interaction is further supported by a strong X-ray detection. The spectra are rapidly evolving and dominated by hydrogen, helium, and calcium emission lines. We identify a rare high-velocity emission-line feature blueshifted at �7800 km, s-1 (in Hα, Hβ, Pβ, Pγ, He i, and Ca ii), which is visible from day 18 until at least day 78 and could be evidence of an asymmetric progenitor or explosion. From the overall similarity between SN 2018ivc and SN 1996al, the Hα equivalent width of its parent H ii region, and constraints from pre-explosion archival Hubble Space Telescope images, we find that the progenitor of SN 2018ivc could be as massive as 52 M� but is more likely <12 M�. SN 2018ivc demonstrates the importance of the early discovery and rapid follow-up observations of nearby supernovae to study the physics and progenitors of these cosmic explosions. © 2020. The American Astronomical Society. All rights reserved.

Item Type: Journal Article
Publication: Astrophysical Journal
Publisher: Institute of Physics Publishing
Additional Information: Copy right for this article belongs to Institute of Physics Publishing
Department/Centre: Division of Physical & Mathematical Sciences > Joint Astronomy Programme
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 15 Dec 2020 10:24
Last Modified: 15 Dec 2020 10:24
URI: http://eprints.iisc.ac.in/id/eprint/65727

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