Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068
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Author
Bostroem, K. A.Valenti, S.
Sand, D. J.
Andrews, J. E.
Van Dyk, S. D.
Galbany, L.
Pooley, D.
Amaro, R. C.
Smith, N.
Yang, S.
Anupama, G. C.
Arcavi, I.

Baron, E.
Brown, P. J.
Burke, J.
Cartier, R.
Hiramatsu, D.
Dastidar, R.
DerKacy, J. M.
Dong, Y.
Egami, E.
Ertel, S.
Filippenko, A. V.

Fox, O. D.

Haislip, J.
Hosseinzadeh, G.
Howell, D. A.
Gangopadhyay, A.
Jha, S. W.

Kouprianov, V.
Kumar, B.
Lundquist, M.
Milisavljevic, D.
McCully, C.

Milne, P.
Misra, K.
Reichart, D. E.
Sahu, D. K.
Sai, H.
Singh, A.
Smith, P. S.
Vinko, J.
Wang, X.

Wang, Y.
Wheeler, J. C.

Williams, G. G.
Wyatt, S.
Zhang, J.
Zhang, X.
Affiliation
Univ Arizona, Steward ObservUniv Arizona, MMT Observ
Issue Date
2020-05-21
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IOP PUBLISHING LTDCitation
Bostroem, K. A., Valenti, S., Sand, D. J., Andrews, J. E., Van Dyk, S. D., Galbany, L., ... & Zhang, X (2020). Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068. The Astrophysical Journal, 895(1), 31.Journal
ASTROPHYSICAL JOURNALRights
© 2020. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
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 similar to 7800 (in H alpha, H beta, P beta, P gamma, 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 H alpha 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 but is more likely <12. 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.ISSN
0004-637XEISSN
1538-4357Version
Final published versionSponsors
National Natural Science Foundation of Chinaae974a485f413a2113503eed53cd6c53
10.3847/1538-4357/ab8945