First release of high-redshift superluminous supernovae from the Subaru HIgh-Z sUpernova CAmpaign (SHIZUCA). II. Spectroscopic properties

Abstract

We present Keck spectroscopic observations of three probable high redshift superluminous supernovae (SLSNe) from the Subaru HIgh-Z sUpernova CAmpaign (SHIZUCA), confirming redshifts of 1.851, 1.965 and 2.399. The host galaxies were selected for transient monitoring from multi-band photometric redshifts. The supernovae are detected during their rise, and the classically scheduled spectra are collected near maximum light. The restframe far-ultraviolet (FUV;$\sim$1000A-2500A) spectra include a significant host galaxy flux contribution and we compare our host galaxy subtracted spectra to UV-luminous SNe from the literature. While the signal-to-noise ratios of the spectra presented here are sufficient for redshift confirmation, supernova spectroscopic type confirmation remains inconclusive. The success of the first SHIZUCA Keck spectroscopic follow-up program demonstrates that campaigns such as SHIZUCA are capable of identifying high redshift SLSNe with sufficient accuracy, speed and depth for rapid, well-cadenced and informative follow-up.

15 pages, 6 figures, submitted to the Astrophysical Journal

References in corpus (20)

• Cosmic Star Formation History
• SN 2006gy: An extremely luminous supernova in the galaxy NGC 1260
• The magnetar model for Type I superluminous supernovae I: Bayesian analysis of the full multicolour light curve sample with MOSFiT
• SN 2006tf: Precursor Eruptions and the Optically Thick Regime of Extremely Luminous Type IIn Supernovae
• Spectroscopy of superluminous supernova host galaxies. A preference of hydrogen-poor events for extreme emission line galaxies
• Super-luminous supernovae at redshifts of 2.05 and 3.90
• Large Structures and Galaxy Evolution in COSMOS at z < 1.1
• Photometric Redshift with Bayesian Priors on Physical Properties of Galaxies
• Superluminous supernovae
• Spectra of Hydrogen-Poor Superluminous Supernovae from the Palomar Transient Factory
• Hydrogen-Poor Superluminous Supernovae from the Pan-STARRS1 Medium Deep Survey
• Ultraviolet Spectroscopy of Supernovae: The First Two Years of Swift Observations
• The unblinking eye on the sky
• First release of high-redshift superluminous supernovae from the Subaru HIgh-Z sUpernova CAmpaign (SHIZUCA). I. Photometric properties
• Studying the Ultraviolet Spectrum of the First Spectroscopically Confirmed Supernova at redshift two
• Type IIn supernovae at z ~ 2 from archival data
• Far-UV HST Spectroscopy of An Unusual Hydrogen Poor Superluminous Supernova: SN2017egm
• Euclid: Superluminous supernovae in the Deep Survey
• DES15E2mlf: A Spectroscopically Confirmed Superluminous Supernova that Exploded 3.5 Gyr After the Big Bang
• Ultraviolet Observations of Supernovae

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