Bright Type IIP Supernovae in Low-metallicity Galaxies

Scott, Spencer; Nicholl, M.; Blanchard, P. K.; Gómez, Sebastián; Berger, E.

doi:10.3847/2041-8213/aaf8ad

Cited by 6 publications

(1 citation statement)

References 42 publications

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“…strong H lines similar to normal luminosity events whereas strong Fe lines similar to subluminous events. The high metallicity environment of SN 2014cy might play a role in the formation of strong metal lines (Scott et al 2019). SNe 2014cy and 2015cz display an early steep declining light curve with slopes consistent with the decline rate of canonical SN IIL light curves.…”

Section: Discussionmentioning

confidence: 64%

The optical properties of three type II supernovae: 2014cx, 2014cy and 2015cz

Dastidar,

Misra,

Singh

et al. 2021

Preprint

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We present the photometric and spectroscopic analysis of three Type II SNe: 2014cx, 2014cy and 2015cz. SN 2014cx is a conventional Type IIP with shallow slope (0.2 mag/50d) and an atypical short plateau (∼86 d). SNe 2014cy and 2015cz show relatively large decline rates (0.88 and 1.64 mag/50d, respectively) at early times before settling to the plateau phase, unlike the canonical Type IIP/L SN light curves. All of them are normal luminosity SN II with an absolute magnitude at mid-plateau of M 50 𝑉 ,14𝑐𝑥 = −16.6 ± 0.4 mag, M 50 𝑉 ,14𝑐𝑦 = −16.5 ± 0.2 mag and M 50 𝑉 ,15𝑐𝑧 = −17.4 ± 0.3 mag. A relatively broad range of 56 Ni masses is ejected in these explosions (0.027-0.070 M ). The spectra shows the classical evolution of Type II SNe, dominated by a blue continuum with broad H lines at early phases and narrower metal lines with P Cygni profiles during the plateau. High velocity H features are identified in the plateau spectra of SN 2014cx at 11600 km s −1 , possibly a sign of ejecta-circumstellar interaction. The spectra of SN 2014cy exhibit strong absorption profile of H similar to normal luminosity events whereas strong metal lines akin to sub-luminous SNe. The analytical modelling of the bolometric light curve of the three events yields similar radii for the three objects within errors (

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Section: Discussionmentioning

confidence: 64%

The optical properties of three type II supernovae: 2014cx, 2014cy and 2015cz

Dastidar,

Misra,

Singh

et al. 2021

Preprint

View full text Add to dashboard Cite

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Optical and near-infrared photometry of 94 type II supernovae from the Carnegie Supernova Project

Anderson,

Contreras,

Stritzinger

et al. 2024

A&A

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Type II supernovae (SNe II) mark the endpoint in the lives of hydrogen-rich massive stars. Their large explosion energies and luminosities allow us to measure distances, metallicities, and star formation rates into the distant Universe. To fully exploit their use in answering different astrophysical problems, high-quality low-redshift data sets are required. Such samples are vital to understand the physics of SNe II, but also to serve as calibrators for distinct -- and often lower-quality -- samples. We present $uBgVri$ optical and $YJH$ near-infrared (NIR) photometry for 94 low-redshift SNe II observed by the Carnegie Supernova Project (CSP). A total of 9817 optical and 1872 NIR photometric data points are released, leading to a sample of high-quality SN II light curves during the first sim 150 days post explosion on a well-calibrated photometric system. The sample is presented and its properties are analysed and discussed through comparison to literature events. We also focus on individual SNe II as examples of classically defined subtypes and outlier objects. Making a cut in the plateau decline rate of our sample ($s_2$), a new subsample of fast-declining SNe II is presented. The sample has a median redshift of 0.015, with the nearest event at 0.001 and the most distant at 0.07. At optical wavelengths ($V$), the sample has a median cadence of 4.7 days over the course of a median coverage of 80 days. In the NIR ($J$), the median cadence is 7.2 days over the course of 59 days. The fast-declining subsample is more luminous than the full sample and shows shorter plateau phases. Of the non-standard SNe II highlighted, SN 2009A particularly stands out with a steeply declining then rising light curve, together with what appears to be two superimposed P-Cygni profiles of in its spectra. We outline the significant utility of these data, and finally provide an outlook of future SN II science.

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The optical properties of three Type II supernovae: 2014cx, 2014cy, and 2015cz

Dastidar

Misra

Singh

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We present the photometric and spectroscopic analysis of three Type II SNe: 2014cx, 2014cy and 2015cz. SN 2014cx is a conventional Type IIP with shallow slope (0.2 mag/50d) and an atypical short plateau (∼86 d). SNe 2014cy and 2015cz show relatively large decline rates (0.88 and 1.64 mag/50d, respectively) at early times before settling to the plateau phase, unlike the canonical Type IIP/L SN light curves. All of them are normal luminosity SN II with an absolute magnitude at mid-plateau of M$_{V,14cx}^{50}$ = $-16.6\, \pm \, 0.4\, \rm {mag}$, M$_{V,14cy}^{50}$ = $-16.5\, \pm \, 0.2\, \rm {mag}$ and M$_{V,15cz}^{50}$ = $-17.4\, \pm \, 0.3\, \rm {mag}$. A relatively broad range of 56Ni masses is ejected in these explosions (0.027-0.070 M⊙). The spectra shows the classical evolution of Type II SNe, dominated by a blue continuum with broad H lines at early phases and narrower metal lines with P Cygni profiles during the plateau. High velocity H i features are identified in the plateau spectra of SN 2014cx at 11600 km s−1, possibly a sign of ejecta-circumstellar interaction. The spectra of SN 2014cy exhibit strong absorption profile of H i similar to normal luminosity events whereas strong metal lines akin to sub-luminous SNe. The analytical modelling of the bolometric light curve of the three events yields similar radii for the three objects within errors (478, 507 and 608 R⊙ for SNe 2014cx, 2014cy and 2015cz, respectively) and a range of ejecta masses (15.0, 22.2 and 18.7 M⊙ for SNe 2014cx, 2014cy and 2015cz), and a modest range of explosion energies (3.3 - 6.0 foe where 1 foe = 1051 erg).

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Bright Type IIP Supernovae in Low-metallicity Galaxies

Cited by 6 publications

References 42 publications

The optical properties of three type II supernovae: 2014cx, 2014cy and 2015cz

The optical properties of three type II supernovae: 2014cx, 2014cy and 2015cz

Optical and near-infrared photometry of 94 type II supernovae from the Carnegie Supernova Project

The optical properties of three Type II supernovae: 2014cx, 2014cy, and 2015cz

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