Superluminous Supernovae

Howell, D. A.

doi:10.1007/978-3-319-20794-0_41-1

Cited by 7 publications

(10 citation statements)

References 96 publications

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“…Colour effects may complicate the direct comparison of these light curves. red at these epochs, while during the main rise it also appear to be likely that SN 2018bsz does not reach the high temperatures of 15-20,000 K reached by other SLSNe-I (Howell 2017;Bose et al 2018).…”

Section: The Sn 2018bsz Light Curve Colours and Temperaturesmentioning

confidence: 92%

“…In order to find similar events we searched the Open Supernova Catalog (Guillochon et al 2017) for all SLSN-I with more than three spectra of reasonable S/N (in order to have various phases of the template SNe covered). These spectra were then converted into templates for SNID, and a comparison was made between SN 2018bsz and other SLSN spectra (together with the full range of other SN spectral templates: those originally available in SNID plus those from Liu et al 2016, 2017and Gutiérrez et al 2017. The best matches (according to SNID but then confirmed visually 6 ) are compared to SN 2018bsz in Fig.…”

Section: Spectral-line Identification Time Evolution and Comparisonmentioning

confidence: 99%

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

Anderson

Pessi

Dessart

et al. 2018

A&A

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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 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 lowestredshift 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 +0.08 −0.33 ×10 9 M , and a star formation rate of = 0.50 +2.22 −0.19 M yr −1 . A nearby H ii region has an oxygen abundance (O3N2) of 8.31±0.01 dex.

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Section: The Sn 2018bsz Light Curve Colours and Temperaturesmentioning

confidence: 92%

Section: Spectral-line Identification Time Evolution and Comparisonmentioning

confidence: 99%

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

Anderson

Pessi

Dessart

et al. 2018

A&A

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“…Superluminous supernovae (SLSNe) are intrinsically luminous supernovae (SNe) that have been recognized in the last decade (Gal-Yam 2012, 2018Howell 2017). They typically reach magnitudes brighter than −21 in optical bands.…”

Section: Introductionmentioning

confidence: 99%

Synthetic spectra of energetic core-collapse supernovae and the early spectra of SN 2007bi and SN 1999as

Moriya

Mazzali

Tanaka

2019

Monthly Notices of the Royal Astronomical Society

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SN 2007bi and SN 1999as are among the first superluminous supernovae discovered. SN 2007bi was suggested to be powered by the radioactive decay of a large amount (5 − 10 M ⊙ ) of 56 Ni. SN 1999as has a similar spectrum to SN 2007bi. One suggested way to synthesize such a large amount of 56 Ni is through energetic core-collapse supernovae from very massive progenitors. Although the synthetic light curves of extremely energetic core-collapse supernovae have been shown to be consistent with SN 2007bi, no synthetic spectra have been reported. Here, we present synthetic spectra of extremely energetic core-collapse supernovae during the photospheric phases. We find that the ejecta density structure above 13, 000 − 16, 000 km s −1 needs to be cut in order to explain the co-existing broad and narrow line absorptions in SN 2007bi and SN 1999as. The density cut is likely caused by the interaction between the supernova ejecta and a dense circumstellar medium. Our results indicate that about 3 M ⊙ of hydrogen-free dense circumstellar media might exist near the progenitors of SN 2007bi and SN 1999as. These massive circumstellar media would significantly affect the lightcurve and spectral properties of the supernovae. The precursors that are sometimes observed in superluminous supernovae might be related to the collision of the ejecta with such dense circumstellar media. We also confirm results of previous studies that synthetic spectra from pair-instability supernova models do not match the early spectra of SN 2007bi and SN 1999as.

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“…Another example is so-called superluminous SNe (SLSNe) that can become brighter than ∼ −21 mag and have blue spectra (e.g., Smith et al 2010;Quimby et al 2011). The mechanisms to make SLSNe very luminous are not yet fully understood, but their progenitors are believed to be massive stars (e.g., Gal-Yam 2012, 2018Howell 2017;Moriya et al 2018). At least some SLSNe are known to be Type IIn (e.g., Smith et al 2010) and they are likely powered by the circumstellar interaction (e.g., Chevalier & Irwin 2011;Moriya et al 2013a;Chatzopoulos et al 2013).…”

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confidence: 99%

First Release of High-Redshift Superluminous Supernovae from the Subaru HIgh- Z SUpernova CAmpaign (SHIZUCA). I. Photometric Properties

Moriya

Tanaka

Yasuda

et al. 2019

ApJS

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We report our first discoveries of high-redshift supernovae from the Subaru HIgh-Z sUpernova CAmpaign (SHIZUCA), the transient survey using Subaru/Hyper Suprime-Cam. We report the discovery of three supernovae at the spectroscopicallyconfirmed redshifts of 2.399 (HSC16adga), 1.965 (HSC17auzg), and 1.851 (HSC17dbpf), and two supernova candidates with the host-galaxy photometric redshifts of 3.2 (HSC16apuo) and 4.2 (HSC17dsid), respectively. In this paper, we present their photometric properties and the spectroscopic properties of the confirmed high-redshift supernovae are presented in the accompanying paper (Curtin et al. 2019). The supernovae with the confirmed redshifts of z ≃ 2 have the rest ultraviolet peak magnitudes close to −21 mag and they are likely superluminous supernovae. The discovery of three supernovae at z ≃ 2 roughly corresponds to the approximate event rate of ∼ 900 ± 520 Gpc −3 yr −1 with Poisson error, which is consistent with the total superluminous supernova rate estimated by extrapolating the local rate based on the cosmic star-formation history. Adding unconfirmed superluminous supernova candidates would increase the event rate. Our superluminous supernova candidates at the redshifts of around 3 and 4 indicate the approximate superluminous supernova rates of ∼ 400 ± 400 Gpc −3 yr −1 (z ∼ 3) and ∼ 500 ± 500 Gpc −3 yr −1 (z ∼ 4) with Poisson errors. Our initial results demonstrate the outstanding capability of Hyper Suprime-Cam to discover high-redshift supernovae.

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Superluminous Supernovae

Cited by 7 publications

References 96 publications

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

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

Synthetic spectra of energetic core-collapse supernovae and the early spectra of SN 2007bi and SN 1999as

First Release of High-Redshift Superluminous Supernovae from the Subaru HIgh- Z SUpernova CAmpaign (SHIZUCA). I. Photometric Properties

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Superluminous Supernovae

Cited by 7 publications

References 96 publications

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

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

Synthetic spectra of energetic core-collapse supernovae and the early spectra of SN 2007bi and SN 1999as

First Release of High-Redshift Superluminous Supernovae from the Subaru HIgh- Z SUpernova CAmpaign (SHIZUCA). I. Photometric Properties

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

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