A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features

J. P. Anderson; P. J. Pessi; L. Dessart; C. Inserra; D. Hiramatsu; K. Taggart; S. J. Smartt; G. Leloudas; T. W. Chen; A. Möller; R. Roy; S. Schulze; D. Perley; J. Selsing; S. J. Prentice; A. Gal-Yam; C. R. Angus; I. Arcavi; C. Ashall; M. Bulla; C. Bray; J. Burke; E. Callis; R. Cartier; S. W. Chang; K. Chambers; P. Clark; L. Denneau; M. Dennefeld; H. Flewelling; M. Fraser; L. Galbany; M. Gromadzki; C. P. Gutiérrez; A. Heinze; G. Hosseinzadeh; D. A. Howell; E. Y. Hsiao; E. Kankare; Z. Kostrzewa-Rutkowska; E. Magnier; K. Maguire; P. Mazzali; O. McBrien; C. McCully; N. Morrell; T. B. Lowe; C. A. Onken; F. Onori; M. M. Phillips; A. Rest; R. Ridden-Harper; A. J. Ruiter; D. J. Sand; K. W. Smith; M. Smith; B. Stalder; M. D. Stritzinger; M. Sullivan; J. L. Tonry; B. E. Tucker; S. Valenti; R. Wainscoat; C. Z. Waters; C. Wolf; D. Young

doi:10.1051/0004-6361/201833725

A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features

J. P. Anderson, P. J. Pessi, L. Dessart, C. Inserra, D. Hiramatsu, K. Taggart, S. J. Smartt, G. Leloudas, T. W. Chen, A. Möller, R. Roy, S. Schulze, D. Perley, J. Selsing, S. J. Prentice, A. Gal-Yam, C. R. Angus, I. Arcavi, C. Ashall, M. BullaC. Bray, J. Burke, E. Callis, R. Cartier, S. W. Chang, K. Chambers, P. Clark, L. Denneau, M. Dennefeld, H. Flewelling, M. Fraser, L. Galbany, M. Gromadzki, C. P. Gutiérrez, A. Heinze, G. Hosseinzadeh, D. A. Howell, E. Y. Hsiao, E. Kankare, Z. Kostrzewa-Rutkowska, E. Magnier, K. Maguire, P. Mazzali, O. McBrien, C. McCully, N. Morrell, T. B. Lowe, C. A. Onken, F. Onori, M. M. Phillips, A. Rest, R. Ridden-Harper, A. J. Ruiter, D. J. Sand, K. W. Smith, M. Smith, B. Stalder, M. D. Stritzinger, M. Sullivan, J. L. Tonry, B. E. Tucker, S. Valenti, R. Wainscoat, C. Z. Waters, C. Wolf, D. Young

Astronomy

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

Context. Super-luminous supernovae (SLSNe) are rare events defined as being significantly more luminous than normal terminal stellar explosions. The source of the additional power needed to achieve such luminosities is still unclear. Discoveries in the local Universe (i.e. z < 0.1) are scarce, but afford dense multi-wavelength observations. Additional low-redshift objects are therefore extremely valuable. Aims. We present early-time observations of the type I SLSN ASASSN-18km/SN 2018bsz. These data are used to characterise the event and compare to literature SLSNe and spectral models. Host galaxy properties are also analysed. Methods. Optical and near-IR photometry and spectroscopy were analysed. Early-time ATLAS photometry was used to constrain the rising light curve. We identified a number of spectral features in optical-wavelength spectra and track their time evolution. Finally, we used archival host galaxy photometry together with Hâ€ II region spectra to constrain the host environment. Results. ASASSN-18km/SN 2018bsz is found to be a type I SLSN in a galaxy at a redshift of 0.0267 (111 Mpc), making it the lowest-redshift event discovered to date. Strong C II lines are identified in the spectra. Spectral models produced by exploding a Wolf-Rayet progenitor and injecting a magnetar power source are shown to be qualitatively similar to ASASSN-18km/SN 2018bsz, contrary to most SLSNe-I that display weak or non-existent C II lines. ASASSN-18km/SN 2018bsz displays a long, slowly rising, red "plateau" of >26 days, before a steeper, faster rise to maximum. The host has an absolute magnitude of -19.8 mag (r), a mass of M_* = 1.5_-0.33 ^+0.08 × 10⁹ M_âŠ™, and a star formation rate of = 0.50_-0.19 ^+2.22 M_âŠ™ yr^-1. A nearby Hâ€ II region has an oxygen abundance (O3N2) of 8.31 ± 0.01 dex.

Original language	English (US)
Article number	A67
Journal	Astronomy and astrophysics
Volume	620
DOIs	https://doi.org/10.1051/0004-6361/201833725
State	Published - Dec 1 2018

Keywords

Supernovae: General
Supernovae: Individual: Asassn-18km
Supernovae: Individual: Sn 2018bsz

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/201833725

Cite this

Anderson, J. P., Pessi, P. J., Dessart, L., Inserra, C., Hiramatsu, D., Taggart, K., Smartt, S. J., Leloudas, G., Chen, T. W., Möller, A., Roy, R., Schulze, S., Perley, D., Selsing, J., Prentice, S. J., Gal-Yam, A., Angus, C. R., Arcavi, I., Ashall, C., ... Young, D. (2018). A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features. Astronomy and astrophysics, 620, Article A67. https://doi.org/10.1051/0004-6361/201833725

Anderson, JP, Pessi, PJ, Dessart, L, Inserra, C, Hiramatsu, D, Taggart, K, Smartt, SJ, Leloudas, G, Chen, TW, Möller, A, Roy, R, Schulze, S, Perley, D, Selsing, J, Prentice, SJ, Gal-Yam, A, Angus, CR, Arcavi, I, Ashall, C, Bulla, M, Bray, C, Burke, J, Callis, E, Cartier, R, Chang, SW, Chambers, K, Clark, P, Denneau, L, Dennefeld, M, Flewelling, H, Fraser, M, Galbany, L, Gromadzki, M, Gutiérrez, CP, Heinze, A, Hosseinzadeh, G, Howell, DA, Hsiao, EY, Kankare, E, Kostrzewa-Rutkowska, Z, Magnier, E, Maguire, K, Mazzali, P, McBrien, O, McCully, C, Morrell, N, Lowe, TB, Onken, CA, Onori, F, Phillips, MM, Rest, A, Ridden-Harper, R, Ruiter, AJ, Sand, DJ, Smith, KW, Smith, M, Stalder, B, Stritzinger, MD, Sullivan, M, Tonry, JL, Tucker, BE, Valenti, S, Wainscoat, R, Waters, CZ, Wolf, C & Young, D 2018, 'A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features', Astronomy and astrophysics, vol. 620, A67. https://doi.org/10.1051/0004-6361/201833725

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title = "A nearby super-luminous supernova with a long pre-maximum & {"}plateau{"} and strong C II features",

abstract = "Context. Super-luminous supernovae (SLSNe) are rare events defined as being significantly more luminous than normal terminal stellar explosions. The source of the additional power needed to achieve such luminosities is still unclear. Discoveries in the local Universe (i.e. z < 0.1) are scarce, but afford dense multi-wavelength observations. Additional low-redshift objects are therefore extremely valuable. Aims. We present early-time observations of the type I SLSN ASASSN-18km/SN 2018bsz. These data are used to characterise the event and compare to literature SLSNe and spectral models. Host galaxy properties are also analysed. Methods. Optical and near-IR photometry and spectroscopy were analysed. Early-time ATLAS photometry was used to constrain the rising light curve. We identified a number of spectral features in optical-wavelength spectra and track their time evolution. Finally, we used archival host galaxy photometry together with H{\^a}€ II region spectra to constrain the host environment. Results. ASASSN-18km/SN 2018bsz is found to be a type I SLSN in a galaxy at a redshift of 0.0267 (111 Mpc), making it the lowest-redshift event discovered to date. Strong C II lines are identified in the spectra. Spectral models produced by exploding a Wolf-Rayet progenitor and injecting a magnetar power source are shown to be qualitatively similar to ASASSN-18km/SN 2018bsz, contrary to most SLSNe-I that display weak or non-existent C II lines. ASASSN-18km/SN 2018bsz displays a long, slowly rising, red {"}plateau{"} of >26 days, before a steeper, faster rise to maximum. The host has an absolute magnitude of -19.8 mag (r), a mass of M* = 1.5-0.33 +0.08 × 109 M{\^a}{\v S}{\texttrademark}, and a star formation rate of = 0.50-0.19 +2.22 M{\^a}{\v S}{\texttrademark} yr-1. A nearby H{\^a}€ II region has an oxygen abundance (O3N2) of 8.31 ± 0.01 dex.",

keywords = "Supernovae: General, Supernovae: Individual: Asassn-18km, Supernovae: Individual: Sn 2018bsz",

author = "Anderson, {J. P.} and Pessi, {P. J.} and L. Dessart and C. Inserra and D. Hiramatsu and K. Taggart and Smartt, {S. J.} and G. Leloudas and Chen, {T. W.} and A. M{\"o}ller and R. Roy and S. Schulze and D. Perley and J. Selsing and Prentice, {S. J.} and A. Gal-Yam and Angus, {C. R.} and I. Arcavi and C. Ashall and M. Bulla and C. Bray and J. Burke and E. Callis and R. Cartier and Chang, {S. W.} and K. Chambers and P. Clark and L. Denneau and M. Dennefeld and H. Flewelling and M. Fraser and L. Galbany and M. Gromadzki and Guti{\'e}rrez, {C. P.} and A. Heinze and G. Hosseinzadeh and Howell, {D. A.} and Hsiao, {E. Y.} and E. Kankare and Z. Kostrzewa-Rutkowska and E. Magnier and K. Maguire and P. Mazzali and O. McBrien and C. McCully and N. Morrell and Lowe, {T. B.} and Onken, {C. A.} and F. Onori and Phillips, {M. M.} and A. Rest and R. Ridden-Harper and Ruiter, {A. J.} and Sand, {D. J.} and Smith, {K. W.} and M. Smith and B. Stalder and Stritzinger, {M. D.} and M. Sullivan and Tonry, {J. L.} and Tucker, {B. E.} and S. Valenti and R. Wainscoat and Waters, {C. Z.} and C. Wolf and D. Young",

note = "Publisher Copyright: {\textcopyright} ESO 2018.",

year = "2018",

month = dec,

day = "1",

doi = "10.1051/0004-6361/201833725",

language = "English (US)",

volume = "620",

journal = "Astronomy and astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

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TY - JOUR

T1 - A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features

AU - Anderson, J. P.

AU - Pessi, P. J.

AU - Dessart, L.

AU - Inserra, C.

AU - Hiramatsu, D.

AU - Taggart, K.

AU - Smartt, S. J.

AU - Leloudas, G.

AU - Chen, T. W.

AU - Möller, A.

AU - Roy, R.

AU - Schulze, S.

AU - Perley, D.

AU - Selsing, J.

AU - Prentice, S. J.

AU - Gal-Yam, A.

AU - Angus, C. R.

AU - Arcavi, I.

AU - Ashall, C.

AU - Bulla, M.

AU - Bray, C.

AU - Burke, J.

AU - Callis, E.

AU - Cartier, R.

AU - Chang, S. W.

AU - Chambers, K.

AU - Clark, P.

AU - Denneau, L.

AU - Dennefeld, M.

AU - Flewelling, H.

AU - Fraser, M.

AU - Galbany, L.

AU - Gromadzki, M.

AU - Gutiérrez, C. P.

AU - Heinze, A.

AU - Hosseinzadeh, G.

AU - Howell, D. A.

AU - Hsiao, E. Y.

AU - Kankare, E.

AU - Kostrzewa-Rutkowska, Z.

AU - Magnier, E.

AU - Maguire, K.

AU - Mazzali, P.

AU - McBrien, O.

AU - McCully, C.

AU - Morrell, N.

AU - Lowe, T. B.

AU - Onken, C. A.

AU - Onori, F.

AU - Phillips, M. M.

AU - Rest, A.

AU - Ridden-Harper, R.

AU - Ruiter, A. J.

AU - Sand, D. J.

AU - Smith, K. W.

AU - Smith, M.

AU - Stalder, B.

AU - Stritzinger, M. D.

AU - Sullivan, M.

AU - Tonry, J. L.

AU - Tucker, B. E.

AU - Valenti, S.

AU - Wainscoat, R.

AU - Waters, C. Z.

AU - Wolf, C.

AU - Young, D.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - Context. Super-luminous supernovae (SLSNe) are rare events defined as being significantly more luminous than normal terminal stellar explosions. The source of the additional power needed to achieve such luminosities is still unclear. Discoveries in the local Universe (i.e. z < 0.1) are scarce, but afford dense multi-wavelength observations. Additional low-redshift objects are therefore extremely valuable. Aims. We present early-time observations of the type I SLSN ASASSN-18km/SN 2018bsz. These data are used to characterise the event and compare to literature SLSNe and spectral models. Host galaxy properties are also analysed. Methods. Optical and near-IR photometry and spectroscopy were analysed. Early-time ATLAS photometry was used to constrain the rising light curve. We identified a number of spectral features in optical-wavelength spectra and track their time evolution. Finally, we used archival host galaxy photometry together with Hâ€ II region spectra to constrain the host environment. Results. ASASSN-18km/SN 2018bsz is found to be a type I SLSN in a galaxy at a redshift of 0.0267 (111 Mpc), making it the lowest-redshift event discovered to date. Strong C II lines are identified in the spectra. Spectral models produced by exploding a Wolf-Rayet progenitor and injecting a magnetar power source are shown to be qualitatively similar to ASASSN-18km/SN 2018bsz, contrary to most SLSNe-I that display weak or non-existent C II lines. ASASSN-18km/SN 2018bsz displays a long, slowly rising, red "plateau" of >26 days, before a steeper, faster rise to maximum. The host has an absolute magnitude of -19.8 mag (r), a mass of M* = 1.5-0.33 +0.08 × 109 MâŠ™, and a star formation rate of = 0.50-0.19 +2.22 MâŠ™ yr-1. A nearby Hâ€ II region has an oxygen abundance (O3N2) of 8.31 ± 0.01 dex.

AB - Context. Super-luminous supernovae (SLSNe) are rare events defined as being significantly more luminous than normal terminal stellar explosions. The source of the additional power needed to achieve such luminosities is still unclear. Discoveries in the local Universe (i.e. z < 0.1) are scarce, but afford dense multi-wavelength observations. Additional low-redshift objects are therefore extremely valuable. Aims. We present early-time observations of the type I SLSN ASASSN-18km/SN 2018bsz. These data are used to characterise the event and compare to literature SLSNe and spectral models. Host galaxy properties are also analysed. Methods. Optical and near-IR photometry and spectroscopy were analysed. Early-time ATLAS photometry was used to constrain the rising light curve. We identified a number of spectral features in optical-wavelength spectra and track their time evolution. Finally, we used archival host galaxy photometry together with Hâ€ II region spectra to constrain the host environment. Results. ASASSN-18km/SN 2018bsz is found to be a type I SLSN in a galaxy at a redshift of 0.0267 (111 Mpc), making it the lowest-redshift event discovered to date. Strong C II lines are identified in the spectra. Spectral models produced by exploding a Wolf-Rayet progenitor and injecting a magnetar power source are shown to be qualitatively similar to ASASSN-18km/SN 2018bsz, contrary to most SLSNe-I that display weak or non-existent C II lines. ASASSN-18km/SN 2018bsz displays a long, slowly rising, red "plateau" of >26 days, before a steeper, faster rise to maximum. The host has an absolute magnitude of -19.8 mag (r), a mass of M* = 1.5-0.33 +0.08 × 109 MâŠ™, and a star formation rate of = 0.50-0.19 +2.22 MâŠ™ yr-1. A nearby Hâ€ II region has an oxygen abundance (O3N2) of 8.31 ± 0.01 dex.

KW - Supernovae: General

KW - Supernovae: Individual: Asassn-18km

KW - Supernovae: Individual: Sn 2018bsz

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U2 - 10.1051/0004-6361/201833725

DO - 10.1051/0004-6361/201833725

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JO - Astronomy and astrophysics

JF - Astronomy and astrophysics

M1 - A67

ER -

A nearby super-luminous supernova with a long pre-maximum & "plateau" and strong C II features

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