SN 2017ens: The Metamorphosis of a Luminous Broadlined Type Ic Supernova into an SN IIn

T. W. Chen; C. Inserra; M. Fraser; T. J. Moriya; P. Schady; T. Schweyer; A. V. Filippenko; D. A. Perley; A. J. Ruiter; I. Seitenzahl; J. Sollerman; F. Taddia; J. P. Anderson; R. J. Foley; A. Jerkstrand; C. C. Ngeow; Y. C. Pan; A. Pastorello; S. Points; S. J. Smartt; K. W. Smith; S. Taubenberger; P. Wiseman; D. R. Young; S. Benetti; M. Berton; F. Bufano; P. Clark; M. Della Valle; L. Galbany; A. Gal-Yam; M. Gromadzki; C. P. Gutiérrez; A. Heinze; E. Kankare; C. D. Kilpatrick; H. Kuncarayakti; G. Leloudas; Z. Y. Lin; K. Maguire; P. Mazzali; O. McBrien; S. J. Prentice; A. Rau; A. Rest; M. R. Siebert; B. Stalder; J. L. Tonry; P. C. Yu

doi:10.3847/2041-8213/aaeb2e

SN 2017ens: The Metamorphosis of a Luminous Broadlined Type Ic Supernova into an SN IIn

T. W. Chen, C. Inserra, M. Fraser, T. J. Moriya, P. Schady, T. Schweyer, A. V. Filippenko, D. A. Perley, A. J. Ruiter, I. Seitenzahl, J. Sollerman, F. Taddia, J. P. Anderson, R. J. Foley, A. Jerkstrand, C. C. Ngeow, Y. C. Pan, A. Pastorello, S. Points, S. J. SmarttK. W. Smith, S. Taubenberger, P. Wiseman, D. R. Young, S. Benetti, M. Berton, F. Bufano, P. Clark, M. Della Valle, L. Galbany, A. Gal-Yam, M. Gromadzki, C. P. Gutiérrez, A. Heinze, E. Kankare, C. D. Kilpatrick, H. Kuncarayakti, G. Leloudas, Z. Y. Lin, K. Maguire, P. Mazzali, O. McBrien, S. J. Prentice, A. Rau, A. Rest, M. R. Siebert, B. Stalder, J. L. Tonry, P. C. Yu

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Abstract

We present observations of supernova (SN) 2017ens, discovered by the ATLAS survey and identified as a hot blue object through the GREAT program. The redshift z = 0.1086 implies a peak brightness of M _g = -21.1 mag, placing the object within the regime of superluminous supernovae. We observe a dramatic spectral evolution, from initially being blue and featureless, to later developing features similar to those of the broadlined Type Ic SN 1998bw, and finally showing ∼2000 km s^-1 wide Hα and Hβ emission. Relatively narrow Balmer emission (reminiscent of a SN IIn) is present at all times. We also detect coronal lines, indicative of a dense circumstellar medium. We constrain the progenitor wind velocity to ∼50-60 km s^-1 based on P-Cygni profiles, which is far slower than those present in Wolf-Rayet stars. This may suggest that the progenitor passed through a luminous blue variable phase, or that the wind is instead from a binary companion red supergiant star. At late times we see the ∼2000 km s^-1 wide Hα emission persisting at high luminosity (∼3 × 10⁴⁰ erg s^-1) for at least 100 day, perhaps indicative of additional mass loss at high velocities that could have been ejected by a pulsational pair instability.

Original language	English
Article number	L31
Journal	Astrophysical Journal Letters
Volume	867
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/aaeb2e
Publication status	Published - 10 Nov 2018

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Chen, T. W., Inserra, C., Fraser, M., Moriya, T. J., Schady, P., Schweyer, T., Filippenko, A. V., Perley, D. A., Ruiter, A. J., Seitenzahl, I., Sollerman, J., Taddia, F., Anderson, J. P., Foley, R. J., Jerkstrand, A., Ngeow, C. C., Pan, Y. C., Pastorello, A., Points, S., ... Yu, P. C. (2018). SN 2017ens: The Metamorphosis of a Luminous Broadlined Type Ic Supernova into an SN IIn. Astrophysical Journal Letters, 867(2), Article L31. https://doi.org/10.3847/2041-8213/aaeb2e

@article{423179ac70fb46258c7cf0bcd32007c7,

title = "SN 2017ens: The Metamorphosis of a Luminous Broadlined Type Ic Supernova into an SN IIn",

abstract = "We present observations of supernova (SN) 2017ens, discovered by the ATLAS survey and identified as a hot blue object through the GREAT program. The redshift z = 0.1086 implies a peak brightness of M g = -21.1 mag, placing the object within the regime of superluminous supernovae. We observe a dramatic spectral evolution, from initially being blue and featureless, to later developing features similar to those of the broadlined Type Ic SN 1998bw, and finally showing ∼2000 km s-1 wide Hα and Hβ emission. Relatively narrow Balmer emission (reminiscent of a SN IIn) is present at all times. We also detect coronal lines, indicative of a dense circumstellar medium. We constrain the progenitor wind velocity to ∼50-60 km s-1 based on P-Cygni profiles, which is far slower than those present in Wolf-Rayet stars. This may suggest that the progenitor passed through a luminous blue variable phase, or that the wind is instead from a binary companion red supergiant star. At late times we see the ∼2000 km s-1 wide Hα emission persisting at high luminosity (∼3 × 1040 erg s-1) for at least 100 day, perhaps indicative of additional mass loss at high velocities that could have been ejected by a pulsational pair instability.",

keywords = "supernovae: general, supernovae: individual (SN 2017ens)",

author = "Chen, {T. W.} and C. Inserra and M. Fraser and Moriya, {T. J.} and P. Schady and T. Schweyer and Filippenko, {A. V.} and Perley, {D. A.} and Ruiter, {A. J.} and I. Seitenzahl and J. Sollerman and F. Taddia and Anderson, {J. P.} and Foley, {R. J.} and A. Jerkstrand and Ngeow, {C. C.} and Pan, {Y. C.} and A. Pastorello and S. Points and Smartt, {S. J.} and Smith, {K. W.} and S. Taubenberger and P. Wiseman and Young, {D. R.} and S. Benetti and M. Berton and F. Bufano and P. Clark and Valle, {M. Della} and L. Galbany and A. Gal-Yam and M. Gromadzki and Guti{\'e}rrez, {C. P.} and A. Heinze and E. Kankare and Kilpatrick, {C. D.} and H. Kuncarayakti and G. Leloudas and Lin, {Z. Y.} and K. Maguire and P. Mazzali and O. McBrien and Prentice, {S. J.} and A. Rau and A. Rest and Siebert, {M. R.} and B. Stalder and Tonry, {J. L.} and Yu, {P. C.}",

year = "2018",

month = nov,

day = "10",

doi = "10.3847/2041-8213/aaeb2e",

language = "English",

volume = "867",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "2",

}

Chen, TW, Inserra, C, Fraser, M, Moriya, TJ, Schady, P, Schweyer, T, Filippenko, AV, Perley, DA, Ruiter, AJ, Seitenzahl, I, Sollerman, J, Taddia, F, Anderson, JP, Foley, RJ, Jerkstrand, A, Ngeow, CC, Pan, YC, Pastorello, A, Points, S, Smartt, SJ, Smith, KW, Taubenberger, S, Wiseman, P, Young, DR, Benetti, S, Berton, M, Bufano, F, Clark, P, Valle, MD, Galbany, L, Gal-Yam, A, Gromadzki, M, Gutiérrez, CP, Heinze, A, Kankare, E, Kilpatrick, CD, Kuncarayakti, H, Leloudas, G, Lin, ZY, Maguire, K, Mazzali, P, McBrien, O, Prentice, SJ, Rau, A, Rest, A, Siebert, MR, Stalder, B, Tonry, JL & Yu, PC 2018, 'SN 2017ens: The Metamorphosis of a Luminous Broadlined Type Ic Supernova into an SN IIn', Astrophysical Journal Letters, vol. 867, no. 2, L31. https://doi.org/10.3847/2041-8213/aaeb2e

TY - JOUR

T1 - SN 2017ens

T2 - The Metamorphosis of a Luminous Broadlined Type Ic Supernova into an SN IIn

AU - Chen, T. W.

AU - Inserra, C.

AU - Fraser, M.

AU - Moriya, T. J.

AU - Schady, P.

AU - Schweyer, T.

AU - Filippenko, A. V.

AU - Perley, D. A.

AU - Ruiter, A. J.

AU - Seitenzahl, I.

AU - Sollerman, J.

AU - Taddia, F.

AU - Anderson, J. P.

AU - Foley, R. J.

AU - Jerkstrand, A.

AU - Ngeow, C. C.

AU - Pan, Y. C.

AU - Pastorello, A.

AU - Points, S.

AU - Smartt, S. J.

AU - Smith, K. W.

AU - Taubenberger, S.

AU - Wiseman, P.

AU - Young, D. R.

AU - Benetti, S.

AU - Berton, M.

AU - Bufano, F.

AU - Clark, P.

AU - Valle, M. Della

AU - Galbany, L.

AU - Gal-Yam, A.

AU - Gromadzki, M.

AU - Gutiérrez, C. P.

AU - Heinze, A.

AU - Kankare, E.

AU - Kilpatrick, C. D.

AU - Kuncarayakti, H.

AU - Leloudas, G.

AU - Lin, Z. Y.

AU - Maguire, K.

AU - Mazzali, P.

AU - McBrien, O.

AU - Prentice, S. J.

AU - Rau, A.

AU - Rest, A.

AU - Siebert, M. R.

AU - Stalder, B.

AU - Tonry, J. L.

AU - Yu, P. C.

PY - 2018/11/10

Y1 - 2018/11/10

N2 - We present observations of supernova (SN) 2017ens, discovered by the ATLAS survey and identified as a hot blue object through the GREAT program. The redshift z = 0.1086 implies a peak brightness of M g = -21.1 mag, placing the object within the regime of superluminous supernovae. We observe a dramatic spectral evolution, from initially being blue and featureless, to later developing features similar to those of the broadlined Type Ic SN 1998bw, and finally showing ∼2000 km s-1 wide Hα and Hβ emission. Relatively narrow Balmer emission (reminiscent of a SN IIn) is present at all times. We also detect coronal lines, indicative of a dense circumstellar medium. We constrain the progenitor wind velocity to ∼50-60 km s-1 based on P-Cygni profiles, which is far slower than those present in Wolf-Rayet stars. This may suggest that the progenitor passed through a luminous blue variable phase, or that the wind is instead from a binary companion red supergiant star. At late times we see the ∼2000 km s-1 wide Hα emission persisting at high luminosity (∼3 × 1040 erg s-1) for at least 100 day, perhaps indicative of additional mass loss at high velocities that could have been ejected by a pulsational pair instability.

AB - We present observations of supernova (SN) 2017ens, discovered by the ATLAS survey and identified as a hot blue object through the GREAT program. The redshift z = 0.1086 implies a peak brightness of M g = -21.1 mag, placing the object within the regime of superluminous supernovae. We observe a dramatic spectral evolution, from initially being blue and featureless, to later developing features similar to those of the broadlined Type Ic SN 1998bw, and finally showing ∼2000 km s-1 wide Hα and Hβ emission. Relatively narrow Balmer emission (reminiscent of a SN IIn) is present at all times. We also detect coronal lines, indicative of a dense circumstellar medium. We constrain the progenitor wind velocity to ∼50-60 km s-1 based on P-Cygni profiles, which is far slower than those present in Wolf-Rayet stars. This may suggest that the progenitor passed through a luminous blue variable phase, or that the wind is instead from a binary companion red supergiant star. At late times we see the ∼2000 km s-1 wide Hα emission persisting at high luminosity (∼3 × 1040 erg s-1) for at least 100 day, perhaps indicative of additional mass loss at high velocities that could have been ejected by a pulsational pair instability.

KW - supernovae: general

KW - supernovae: individual (SN 2017ens)

UR - http://www.scopus.com/inward/record.url?scp=85056739355&partnerID=8YFLogxK

U2 - 10.3847/2041-8213/aaeb2e

DO - 10.3847/2041-8213/aaeb2e

M3 - Article

SN - 2041-8205

VL - 867

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L31

ER -

SN 2017ens: The Metamorphosis of a Luminous Broadlined Type Ic Supernova into an SN IIn

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