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

K. A. Bostroem; S. Valenti; D. J. Sand; J. E. Andrews; S. D. Van Dyk; L. Galbany; D. Pooley; R. C. Amaro; N. Smith; S. Yang; G. C. Anupama; I. Arcavi; E. Baron; P. J. Brown; J. Burke; R. Cartier; D. Hiramatsu; R. Dastidar; J. M. Derkacy; Y. Dong; E. Egami; S. Ertel; A. V. Filippenko; O. D. Fox; J. Haislip; G. Hosseinzadeh; D. A. Howell; A. Gangopadhyay; S. W. Jha; V. Kouprianov; B. Kumar; M. Lundquist; D. Milisavljevic; C. McCully; P. Milne; K. Misra; D. E. Reichart; D. K. Sahu; H. Sai; A. Singh; P. S. Smith; J. Vinko; X. Wang; Y. Wang; J. C. Wheeler; G. G. Williams; S. Wyatt; J. Zhang; X. Zhang

doi:10.3847/1538-4357/ab8945

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

K. A. Bostroem, S. Valenti, D. J. Sand, J. E. Andrews, S. D. Van Dyk, L. Galbany, D. Pooley, R. C. Amaro, N. Smith, S. Yang, G. C. Anupama, I. Arcavi, E. Baron, P. J. Brown, J. Burke, R. Cartier, D. Hiramatsu, R. Dastidar, J. M. Derkacy, Y. DongE. Egami, S. Ertel, A. V. Filippenko, O. D. Fox, J. Haislip, G. Hosseinzadeh, D. A. Howell, A. Gangopadhyay, S. W. Jha, V. Kouprianov, B. Kumar, M. Lundquist, D. Milisavljevic, C. McCully, P. Milne, K. Misra, D. E. Reichart, D. K. Sahu, H. Sai, A. Singh, P. S. Smith, J. Vinko, X. Wang, Y. Wang, J. C. Wheeler, G. G. Williams, S. Wyatt, J. Zhang, X. Zhang

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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 ∼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.

Original language	English (US)
Article number	31
Journal	Astrophysical Journal
Volume	895
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ab8945
State	Published - May 20 2020

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/ab8945

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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., ... Zhang, X. (2020). Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068. Astrophysical Journal, 895(1), Article 31. https://doi.org/10.3847/1538-4357/ab8945

Bostroem, KA, Valenti, S, Sand, DJ, Andrews, JE, Van Dyk, SD, Galbany, L, Pooley, D, Amaro, RC, Smith, N, Yang, S, Anupama, GC, Arcavi, I, Baron, E, Brown, PJ, Burke, J, Cartier, R, Hiramatsu, D, Dastidar, R, Derkacy, JM, Dong, Y, Egami, E, Ertel, S, Filippenko, AV, Fox, OD, Haislip, J, Hosseinzadeh, G, Howell, DA, Gangopadhyay, A, Jha, SW, Kouprianov, V, Kumar, B, Lundquist, M, Milisavljevic, D, McCully, C, Milne, P, Misra, K, Reichart, DE, Sahu, DK, Sai, H, Singh, A, Smith, PS, Vinko, J, Wang, X, Wang, Y, Wheeler, JC, Williams, GG, Wyatt, S, Zhang, J & Zhang, X 2020, 'Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068', Astrophysical Journal, vol. 895, no. 1, 31. https://doi.org/10.3847/1538-4357/ab8945

@article{76e2c8fc50aa431fb180ce8dc70a302b,

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

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 ∼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.",

author = "Bostroem, {K. A.} and S. Valenti and Sand, {D. J.} and Andrews, {J. E.} and {Van Dyk}, {S. D.} and L. Galbany and D. Pooley and Amaro, {R. C.} and N. Smith and S. Yang and Anupama, {G. C.} and I. Arcavi and E. Baron and Brown, {P. J.} and J. Burke and R. Cartier and D. Hiramatsu and R. Dastidar and Derkacy, {J. M.} and Y. Dong and E. Egami and S. Ertel and Filippenko, {A. V.} and Fox, {O. D.} and J. Haislip and G. Hosseinzadeh and Howell, {D. A.} and A. Gangopadhyay and Jha, {S. W.} and V. Kouprianov and B. Kumar and M. Lundquist and D. Milisavljevic and C. McCully and P. Milne and K. Misra and Reichart, {D. E.} and Sahu, {D. K.} and H. Sai and A. Singh and Smith, {P. S.} and J. Vinko and X. Wang and Y. Wang and Wheeler, {J. C.} and Williams, {G. G.} and S. Wyatt and J. Zhang and X. Zhang",

year = "2020",

month = may,

day = "20",

doi = "10.3847/1538-4357/ab8945",

language = "English (US)",

volume = "895",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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TY - JOUR

T1 - Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068

AU - Bostroem, K. A.

AU - Valenti, S.

AU - Sand, D. J.

AU - Andrews, J. E.

AU - Van Dyk, S. D.

AU - Galbany, L.

AU - Pooley, D.

AU - Amaro, R. C.

AU - Smith, N.

AU - Yang, S.

AU - Anupama, G. C.

AU - Arcavi, I.

AU - Baron, E.

AU - Brown, P. J.

AU - Burke, J.

AU - Cartier, R.

AU - Hiramatsu, D.

AU - Dastidar, R.

AU - Derkacy, J. M.

AU - Dong, Y.

AU - Egami, E.

AU - Ertel, S.

AU - Filippenko, A. V.

AU - Fox, O. D.

AU - Haislip, J.

AU - Hosseinzadeh, G.

AU - Howell, D. A.

AU - Gangopadhyay, A.

AU - Jha, S. W.

AU - Kouprianov, V.

AU - Kumar, B.

AU - Lundquist, M.

AU - Milisavljevic, D.

AU - McCully, C.

AU - Milne, P.

AU - Misra, K.

AU - Reichart, D. E.

AU - Sahu, D. K.

AU - Sai, H.

AU - Singh, A.

AU - Smith, P. S.

AU - Vinko, J.

AU - Wang, X.

AU - Wang, Y.

AU - Wheeler, J. C.

AU - Williams, G. G.

AU - Wyatt, S.

AU - Zhang, J.

AU - Zhang, X.

PY - 2020/5/20

Y1 - 2020/5/20

N2 - 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.

AB - 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.

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U2 - 10.3847/1538-4357/ab8945

DO - 10.3847/1538-4357/ab8945

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JO - Astrophysical Journal

JF - Astrophysical Journal

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ER -

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

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

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Photometric observations of Type II SN 2018ivc

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