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

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    Bostroem_2020_ApJ_895_31.pdf
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    Final Published Version
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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. cc
    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. cc
    Fox, O. D. cc
    Haislip, J.
    Hosseinzadeh, G.
    Howell, D. A.
    Gangopadhyay, A.
    Jha, S. W. cc
    Kouprianov, V.
    Kumar, B.
    Lundquist, M.
    Milisavljevic, D.
    McCully, C. cc
    Milne, P.
    Misra, K.
    Reichart, D. E.
    Sahu, D. K.
    Sai, H.
    Singh, A.
    Smith, P. S.
    Vinko, J.
    Wang, X. cc
    Wang, Y.
    Wheeler, J. C. cc
    Williams, G. G.
    Wyatt, S.
    Zhang, J.
    Zhang, X.
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    Affiliation
    Univ Arizona, Steward Observ
    Univ Arizona, MMT Observ
    Issue Date
    2020-05-21
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    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 JOURNAL
    Rights
    © 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
    0004-637X
    EISSN
    1538-4357
    DOI
    10.3847/1538-4357/ab8945
    Version
    Final published version
    Sponsors
    National Natural Science Foundation of China
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab8945
    Scopus Count
    Collections
    UA Faculty Publications

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