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

被引：40

作者：

Chen, T-W ^{[1
]}

Inserra, C. ^{[2
]}

Fraser, M. ^{[3
]}

Moriya, T. J. ^{[4
]}

Schady, P. ^{[1
]}

Schweyer, T. ^{[1
]}

Filippenko, A., V ^{[5
,6
]}

Perley, D. A. ^{[7
]}

Ruiter, A. J. ^{[8
,9
]}

Seitenzahl, I ^{[8
,9
]}

Sollerman, J. ^{[10
]}

Taddia, F. ^{[10
]}

Anderson, J. P. ^{[11
]}

Foley, R. J. ^{[12
]}

Jerkstrand, A. ^{[13
]}

Ngeow, C-C ^{[14
]}

Pan, Y-C ^{[12
]}

Pastorello, A. ^{[15
]}

Points, S. ^{[16
]}

Smartt, S. J. ^{[17
]}

Smith, K. W. ^{[17
]}

Taubenberger, S. ^{[13
,18
]}

Wienlan, P. ^{[2
]}

Young, D. R. ^{[17
]}

Benetti, S. ^{[15
]}

Berton, M. ^{[19
,20
]}

Bufano, F. ^{[21
]}

Clark, P. ^{[17
]}

Della Valle, M. ^{[22
,23
,24
]}

Galbany, L. ^{[25
]}

Gal-Yam, A. ^{[26
]}

Gromadzki, M. ^{[27
]}

Gutierrez, C. P. ^{[2
]}

Heinze, A. ^{[28
]}

Kankare, E. ^{[17
]}

Kilpatrick, C. D. ^{[12
]}

Kuncarayakti, H. ^{[19
,29
]}

Leloudas, G. ^{[30
]}

Lin, Z-Y ^{[14
]}

Maguire, K. ^{[17
]}

Mazzali, P. ^{[7
]}

McBrien, O. ^{[17
]}

Prentice, S. J. ^{[17
]}

Rau, A. ^{[1
]}

Rest, A. ^{[31
,32
]}

Siebert, M. R. ^{[12
]}

Stalder, B. ^{[33
]}

Tonry, J. L. ^{[28
]}

Yu, P-C ^{[14
]}

机构：

[1] Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany

[2] Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England

[3] Univ Coll Dublin, OBrien Ctr Sci North, Sch Phys, Dublin 4, Ireland

[4] Natl Inst Nat Sci, Natl Astron Observ Japan, Div Theoret Astron, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[5] Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA

[6] Univ Calif Berkeley, Miller Inst Basic Res Sci, Berkeley, CA 94720 USA

[7] Liverpool John Moores Univ, Astrophys Res Inst, IC2, Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England

[8] Univ New South Wales, Australian Def Force Acad, Sch Phys Environm & Math Sci, Canberra, ACT 2600, Australia

[9] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia

[10] Stockholm Univ, Oskar Klein Ctr, Dept Astron, AlbaNova, SE-10691 Stockholm, Sweden

[11] European Southern Observ, Alonso de Cordova 3107,Casilla 19, Santiago, Chile

[12] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

[13] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany

[14] Natl Cent Univ, Grad Inst Astron, 300 Zhongda Rd, Taoyuan 32001, Taiwan

[15] INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

[16] CTIO NOAO, Casilla 603, La Serena, Chile

[17] Queens Univ Belfast, Astrophys Res Ctr, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland

[18] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[19] Univ Turku, Finnish Ctr Astron ESO FINCA, FI-20014 Turku, Finland

[20] Aalto Univ Metsahovi Radio Observ, Metsahovintie 114, FI-02540 Kylmala, Finland

[21] INAF Osservatorio Astrofis Catania, Via Santa Sofia 78, I-95123 Catania, Italy

[22] INAF Osservatorio Astron Napoli, Salita Moiariello 16, I-80131 Naples, Italy

[23] CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain

[24] Int Ctr Relativist Astrophys, Piazza Repubbl 10, I-65122 Pescara, Italy

[25] Univ Pittsburgh, Dept Phys & Astron, PITT PACC, Pittsburgh, PA 15260 USA

[26] Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-76100 Rehovot, Israel

[27] Warsaw Univ Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland

[28] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

[29] Univ Turku, Dept Phys & Astron, Tuorla Observ, FI-20014 Turku, Finland

[30] Tech Univ Denmark, Natl Space Inst, DTU Space, Elektrovej 327, DK-2800 Lyngby, Denmark

[31] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[32] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[33] LSST, 950 North Cherry Ave, Tucson, AZ 85719 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2018年 / 867卷 / 02期

基金：

澳大利亚研究理事会; 美国国家科学基金会; 爱尔兰科学基金会; 欧盟地平线“2020”; 欧洲研究理事会;

关键词：

supernovae: general; supernovae: individual (SN 2017ens); STARS;

D O I：

10.3847/2041-8213/aaeb2e

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 H alpha and H beta 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 similar 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 similar to 2000 km s(-1) wide H alpha emission persisting at high luminosity (similar to 3 x 10(40) 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.

引用

页数：8

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