A nearby super-luminous supernova with a long pre-maximum & “plateau” and strong C II features
J. Anderson
(1)
,
P. Pessi
(2)
,
L. Dessart
(3)
,
C. Inserra
(4)
,
D. Hiramatsu
(5)
,
K. Taggart
(6)
,
S. Smartt
(7)
,
G. Leloudas
(8)
,
T.-W. Chen
(9)
,
A. Möller
(10)
,
R. Roy
(11)
,
S. Schulze
(12)
,
D. Perley
(6)
,
J. Selsing
(8)
,
S. Prentice
(6)
,
A. Gal-Yam
(13)
,
C. Angus
(4)
,
I. Arcavi
(5)
,
C. Ashall
(14)
,
M. Bulla
(15)
,
C. Bray
(16)
,
J. Burke
(5)
,
E. Callis
(17)
,
R. Cartier
(18)
,
S.-W. Chang
(10)
,
K. Chambers
(19)
,
P. Clark
,
L. Denneau
(19)
,
M. Dennefeld
(20)
,
H. Flewelling
(19)
,
M. Fraser
(17)
,
L. Galbany
(21)
,
M. Gromadzki
,
C. Gutiérrez
(4)
,
A. Heinze
(19)
,
G. Hosseinzadeh
(5)
,
D. Howell
(5)
,
E. Hsiao
(14)
,
E. Kankare
(7)
,
Z. Kostrzewa-Rutkowska
(22)
,
E. Magnier
(23, 19)
,
K. Maguire
(7)
,
P. Mazzali
,
O. Mcbrien
(7)
,
C. Mccully
(5)
,
N. Morrell
,
T. Lowe
,
C. Onken
(10)
,
F. Onori
,
M. Phillips
,
A. Rest
,
R. Ridden-Harper
(10)
,
A. Ruiter
,
D. Sand
,
K. Smith
,
M. Smith
(24)
,
B. Stalder
,
M. Stritzinger
,
M. Sullivan
,
J. Tonry
(19)
,
B. Tucker
,
S. Valenti
(25)
,
R. Wainscoat
(19)
,
C. Waters
(19)
,
C. Wolf
(26)
,
D. Young
(7)
1
ESO -
European Southern Observatory [Santiago]
2 Instituto de Astrofísica de La Plata
3 LAM - Laboratoire d'Astrophysique de Marseille
4 School of Physics and Astronomy [Southampton]
5 LCO - Las Cumbres Observatory
6 ARI - Astrophysics Research Institute [Liverpool]
7 ARC - Astrophysics Research Centre [Belfast]
8 DARK - Dark Cosmology Centre
9 MPE - Max-Planck-Institut für Extraterrestrische Physik
10 CAASTRO - Centre of Excellence for All-Sky Astrophysics
11 EDF R&D STEP - Simulation et Traitement de l'information pour l'Exploitation des systèmes de Production
12 Weizmann Institute of Science [Rehovot, Israël]
13 Department of Particle Physics and Astrophysics
14 FSU - Florida State University [Tallahassee]
15 Oskar Klein Centre [Stockholm]
16 LADIR - Laboratoire de Dynamique Interactions et Réactivité
17 UCD - University College Dublin [Dublin]
18 CTIO - Cerro Tololo Inter-American Observatory
19 Institute for Astronomy [Honolulu]
20 IAP - Institut d'Astrophysique de Paris
21 Department of Physics [Pittsburgh]
22 SRON - SRON Netherlands Institute for Space Research
23 ILV - Institut Lavoisier de Versailles
24 IRCAD/EITS - Institut de Recherche Contre les Cancers de l'Appareil Digestif-European Institute of Telesurgery
25 UC - University of California
26 RSAA - Research School of Astronomy and Astrophysics [Canberra]
2 Instituto de Astrofísica de La Plata
3 LAM - Laboratoire d'Astrophysique de Marseille
4 School of Physics and Astronomy [Southampton]
5 LCO - Las Cumbres Observatory
6 ARI - Astrophysics Research Institute [Liverpool]
7 ARC - Astrophysics Research Centre [Belfast]
8 DARK - Dark Cosmology Centre
9 MPE - Max-Planck-Institut für Extraterrestrische Physik
10 CAASTRO - Centre of Excellence for All-Sky Astrophysics
11 EDF R&D STEP - Simulation et Traitement de l'information pour l'Exploitation des systèmes de Production
12 Weizmann Institute of Science [Rehovot, Israël]
13 Department of Particle Physics and Astrophysics
14 FSU - Florida State University [Tallahassee]
15 Oskar Klein Centre [Stockholm]
16 LADIR - Laboratoire de Dynamique Interactions et Réactivité
17 UCD - University College Dublin [Dublin]
18 CTIO - Cerro Tololo Inter-American Observatory
19 Institute for Astronomy [Honolulu]
20 IAP - Institut d'Astrophysique de Paris
21 Department of Physics [Pittsburgh]
22 SRON - SRON Netherlands Institute for Space Research
23 ILV - Institut Lavoisier de Versailles
24 IRCAD/EITS - Institut de Recherche Contre les Cancers de l'Appareil Digestif-European Institute of Telesurgery
25 UC - University of California
26 RSAA - Research School of Astronomy and Astrophysics [Canberra]
L. Dessart
- Fonction : Auteur
- PersonId : 757276
- ORCID : 0000-0003-0599-8407
- IdRef : 19608895X
A. Gal-Yam
- Fonction : Auteur
- PersonId : 755622
- ORCID : 0000-0002-3653-5598
S.-W. Chang
- Fonction : Auteur
- PersonId : 786050
- ORCID : 0000-0002-3118-8275
P. Clark
- Fonction : Auteur
M. Gromadzki
- Fonction : Auteur
P. Mazzali
- Fonction : Auteur
N. Morrell
- Fonction : Auteur
T. Lowe
- Fonction : Auteur
F. Onori
- Fonction : Auteur
M. Phillips
- Fonction : Auteur
- PersonId : 755343
- ORCID : 0000-0001-6041-7092
A. Rest
- Fonction : Auteur
A. Ruiter
- Fonction : Auteur
D. Sand
- Fonction : Auteur
K. Smith
- Fonction : Auteur
B. Stalder
- Fonction : Auteur
M. Stritzinger
- Fonction : Auteur
M. Sullivan
- Fonction : Auteur
B. Tucker
- Fonction : Auteur
C. Wolf
- Fonction : Auteur
- PersonId : 759268
- ORCID : 0000-0002-4569-016X
Résumé
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 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⊙, and a star formation rate of = 0.50−0.19+2.22 M⊙ yr −1. A nearby H II region has an oxygen abundance (O3N2) of 8.31 ± 0.01 dex.
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