The University of Southampton
University of Southampton Institutional Repository

SN 2017ens: The metamorphosis of a luminous broadlined type Ic supernova into an SN IIn

SN 2017ens: The metamorphosis of a luminous broadlined type Ic supernova into an SN IIn
SN 2017ens: The metamorphosis of a luminous broadlined type Ic supernova into an SN IIn

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.

supernovae: general, supernovae: individual (SN 2017ens)
2041-8205
Chen, T.W.
01d5b56d-5665-4775-9d6e-dae6b1106829
Inserra, C.
004da73f-5b5e-43f4-b1a7-aaa0e579672e
Fraser, M.
525afe70-c2ed-49e4-b46d-3fe44dd2de68
Moriya, T.J.
dfe0bb05-d2ce-486a-9e25-687f4887c722
Schady, P.
653a080c-f286-4eef-bc7d-1a1e09644f07
Schweyer, T.
04f77381-d0ec-4cff-8581-4cf59184b3fd
Filippenko, A.V.
76d14187-e168-44cf-9db7-c5c2102c268b
Perley, D.A.
1461c78a-63ce-4d55-90bd-fb15c122368e
Ruiter, A.J.
985ec08e-67e2-4f21-872c-6e204fb970f4
Seitenzahl, I.
6b1e3b06-7880-484e-a222-d5595009d00a
Sollerman, J.
a37ec2c5-4e23-49d1-800f-5a7b830d75f0
Taddia, F.
7003cdfc-f170-49b7-9776-87f701a17e0b
Anderson, J.P.
31beb06e-edd2-482b-b8d2-815819ef40d8
Foley, R.J.
135282e0-7cdc-429c-9913-9122dda1cb7c
Jerkstrand, A.
8d69b4b6-5293-4344-be3e-bb0f32e51f27
Ngeow, C.C.
87874967-0812-4329-ba67-32235c3e889f
Pan, Y.C.
378f40fb-d382-4ec4-aabf-ea5559a2d6da
Pastorello, A.
8857f6c5-e2bb-41b2-b094-bdf93cf4e0f5
Points, S.
7943e896-4471-4ed4-8975-7b6955da5d98
Smartt, S.J.
feb44ff4-12b4-4352-9af5-5e21d95d2aea
Smith, K.W.
db3f9e07-007f-45e6-a27c-00b422feedd4
Taubenberger, S.
a81f550f-8713-4f0a-9205-34ae5078f88d
Wiseman, P.
865f95f8-2200-46a8-bd5e-3ee30bb44072
Young, D.R.
91d4e316-08f2-4ecd-8d06-3b21abe69d70
Benetti, S.
9bcdb230-a1c8-4f53-a7e1-1d8e30589340
Berton, M.
714095de-6c79-4939-8707-20489a77f28f
Bufano, F.
9d463835-dce0-4798-9873-f950456d29b4
Clark, P.
7150f934-23de-4bc1-981e-b3ee30740aa9
Valle, M. Della
dd67737f-08f7-42b3-9ef1-575b7c2a2fa4
Galbany, L.
76c0f594-2419-43d1-8c38-6429ecad4a03
Gal-Yam, A.
32060b88-6fbc-42cc-9ec3-1de2842aa0e5
Gromadzki, M.
011430ba-bcc6-482b-bf0d-f084bd9f06e0
Gutiérrez, C.P.
14464da3-b453-4980-bff2-b22afa4b4366
Heinze, A.
e1acd67b-aef8-4380-a62e-9287d2c3e4b0
Kankare, E.
6916c889-bb78-4713-b504-b14093e3acf7
Kilpatrick, C.D.
984c893a-4c2f-4cb3-b320-6e56b0a3f63e
Kuncarayakti, H.
9cb6c8ea-00e3-4d82-a6d7-946b12897e62
Leloudas, G.
918d1465-2267-434e-85c1-c6432aaabce4
Lin, Z.Y.
96a395f8-9d00-408a-ba1d-bf90bf3b9434
Maguire, K.
94dfab90-b220-454f-8d2a-4ab4ffe27c65
Mazzali, P.
00e826f0-3a40-4e77-a6e7-c0a0877eae58
McBrien, O.
274a1787-e9a0-40a0-8417-73509e805f97
Prentice, S.J.
ff92dd02-c12a-47b3-9e30-34d8d56040da
Rau, A.
a78864c1-5894-4bf4-9c2a-f0009a5f089b
Rest, A.
46703e55-0c80-41d1-aeff-27269f39ddc3
Siebert, M. R.
ae30f0da-05a0-4395-85bb-20509593c742
Stalder, B.
13a13fc2-90dd-4c1d-8479-d95309514d9c
Tonry, J.L.
b7453302-5d86-420d-8f4c-a883e1f5c9a0
Yu, P.C.
c5e6d33f-1bd6-471f-ad36-9c0091ba56c4
Chen, T.W.
01d5b56d-5665-4775-9d6e-dae6b1106829
Inserra, C.
004da73f-5b5e-43f4-b1a7-aaa0e579672e
Fraser, M.
525afe70-c2ed-49e4-b46d-3fe44dd2de68
Moriya, T.J.
dfe0bb05-d2ce-486a-9e25-687f4887c722
Schady, P.
653a080c-f286-4eef-bc7d-1a1e09644f07
Schweyer, T.
04f77381-d0ec-4cff-8581-4cf59184b3fd
Filippenko, A.V.
76d14187-e168-44cf-9db7-c5c2102c268b
Perley, D.A.
1461c78a-63ce-4d55-90bd-fb15c122368e
Ruiter, A.J.
985ec08e-67e2-4f21-872c-6e204fb970f4
Seitenzahl, I.
6b1e3b06-7880-484e-a222-d5595009d00a
Sollerman, J.
a37ec2c5-4e23-49d1-800f-5a7b830d75f0
Taddia, F.
7003cdfc-f170-49b7-9776-87f701a17e0b
Anderson, J.P.
31beb06e-edd2-482b-b8d2-815819ef40d8
Foley, R.J.
135282e0-7cdc-429c-9913-9122dda1cb7c
Jerkstrand, A.
8d69b4b6-5293-4344-be3e-bb0f32e51f27
Ngeow, C.C.
87874967-0812-4329-ba67-32235c3e889f
Pan, Y.C.
378f40fb-d382-4ec4-aabf-ea5559a2d6da
Pastorello, A.
8857f6c5-e2bb-41b2-b094-bdf93cf4e0f5
Points, S.
7943e896-4471-4ed4-8975-7b6955da5d98
Smartt, S.J.
feb44ff4-12b4-4352-9af5-5e21d95d2aea
Smith, K.W.
db3f9e07-007f-45e6-a27c-00b422feedd4
Taubenberger, S.
a81f550f-8713-4f0a-9205-34ae5078f88d
Wiseman, P.
865f95f8-2200-46a8-bd5e-3ee30bb44072
Young, D.R.
91d4e316-08f2-4ecd-8d06-3b21abe69d70
Benetti, S.
9bcdb230-a1c8-4f53-a7e1-1d8e30589340
Berton, M.
714095de-6c79-4939-8707-20489a77f28f
Bufano, F.
9d463835-dce0-4798-9873-f950456d29b4
Clark, P.
7150f934-23de-4bc1-981e-b3ee30740aa9
Valle, M. Della
dd67737f-08f7-42b3-9ef1-575b7c2a2fa4
Galbany, L.
76c0f594-2419-43d1-8c38-6429ecad4a03
Gal-Yam, A.
32060b88-6fbc-42cc-9ec3-1de2842aa0e5
Gromadzki, M.
011430ba-bcc6-482b-bf0d-f084bd9f06e0
Gutiérrez, C.P.
14464da3-b453-4980-bff2-b22afa4b4366
Heinze, A.
e1acd67b-aef8-4380-a62e-9287d2c3e4b0
Kankare, E.
6916c889-bb78-4713-b504-b14093e3acf7
Kilpatrick, C.D.
984c893a-4c2f-4cb3-b320-6e56b0a3f63e
Kuncarayakti, H.
9cb6c8ea-00e3-4d82-a6d7-946b12897e62
Leloudas, G.
918d1465-2267-434e-85c1-c6432aaabce4
Lin, Z.Y.
96a395f8-9d00-408a-ba1d-bf90bf3b9434
Maguire, K.
94dfab90-b220-454f-8d2a-4ab4ffe27c65
Mazzali, P.
00e826f0-3a40-4e77-a6e7-c0a0877eae58
McBrien, O.
274a1787-e9a0-40a0-8417-73509e805f97
Prentice, S.J.
ff92dd02-c12a-47b3-9e30-34d8d56040da
Rau, A.
a78864c1-5894-4bf4-9c2a-f0009a5f089b
Rest, A.
46703e55-0c80-41d1-aeff-27269f39ddc3
Siebert, M. R.
ae30f0da-05a0-4395-85bb-20509593c742
Stalder, B.
13a13fc2-90dd-4c1d-8479-d95309514d9c
Tonry, J.L.
b7453302-5d86-420d-8f4c-a883e1f5c9a0
Yu, P.C.
c5e6d33f-1bd6-471f-ad36-9c0091ba56c4

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., Smartt, S.J., Smith, K.W., Taubenberger, S., Wiseman, P., Young, D.R., Benetti, S., Berton, M., Bufano, F., Clark, P., Valle, M. Della, Galbany, L., Gal-Yam, A., Gromadzki, M., Gutiérrez, C.P., Heinze, A., Kankare, E., Kilpatrick, C.D., Kuncarayakti, H., Leloudas, G., Lin, Z.Y., Maguire, K., Mazzali, P., McBrien, O., Prentice, S.J., Rau, A., Rest, A., Siebert, M. R., Stalder, B., Tonry, J.L. and Yu, P.C. (2018) SN 2017ens: The metamorphosis of a luminous broadlined type Ic supernova into an SN IIn. The Astrophysical Journal Letters, 867 (2). (doi:10.3847/2041-8213/aaeb2e).

Record type: Article

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.

Full text not available from this repository.

More information

Accepted/In Press date: 20 October 2018
e-pub ahead of print date: 9 November 2018
Published date: 10 November 2018
Keywords: supernovae: general, supernovae: individual (SN 2017ens)

Identifiers

Local EPrints ID: 428138
URI: https://eprints.soton.ac.uk/id/eprint/428138
ISSN: 2041-8205
PURE UUID: 0746d5cc-c6fc-4211-b4bf-497f20383b57
ORCID for C. Inserra: ORCID iD orcid.org/0000-0002-3968-4409

Catalogue record

Date deposited: 12 Feb 2019 17:30
Last modified: 12 Feb 2019 17:30

Export record

Altmetrics

Contributors

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

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×