SN Ares: A Strongly Lensed Type IIb Supernova at $\mathbf{z=1.276}$ with a Predicted 70-Year Time Delay

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   SN Helios: A Multiply Imaged Type II Supernova Opening Time-Delay Cosmography beyond redshift of 3

   S. Fujimoto, C. Larison, J. Pierel et al. · 2026 · Not summarized yet

   SN Helios reports a strongly lensed, spectroscopically confirmed Type II supernova and its potential for time-delay cosmography, like SN Ares.

   Abstract

   We report the discovery and spectroscopic confirmation of SN Helios, a strongly lensed, multiply imaged Type II supernova (SN) at $z=3.34$ behind the galaxy cluster RXC J0018.5+1626. The transient was identified as a red F150W-dropout source (F277W = 26.1 mag) in JWST/NIRCam imaging taken on 2026 July 3 for the VENUS survey, with no counterpart in 2024 December imaging. Director's Discretionary Time observations on 2026 August 17 added second-epoch NIRCam imaging and a deep NIRSpec prism spectrum. The spectrum shows a strong, spectrally resolved H$\alpha$ emission line (FWHM $\approx 7900$ km/s) with a P-Cygni absorption blueshifted by 8800 km/s, together with corresponding H$\beta$ and He I…

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   SN 2025wiu: A Type Ib Supernova with Post-Peak Optical Rebrightening

   Cheng-Han Lai, Ting-Wan Chen, Yu-Hao Zhang et al. · 2026 · High Energy Astrophysical Phenomena · AI summary available

   SN 2025wiu classifies a stripped-envelope supernova and analyzes its spectra and light curve, addressing supernova properties also studied for SN Ares.

   In short

   SN 2025wiu’s optical rebrightening is not a second bolometric peak; the authors favor embedded, aspherical circumstellar interaction as its power source.

3. Close Broader context Not relevant

   Reaching for the stars -- JWST/NIRSpec spectroscopy of a lensed star candidate at $z=4.76$

   Lukas J. Furtak, Ashish K. Meena, Erik Zackrisson et al. · 2023 · Astrophysics of Galaxies · cited 7 times · AI summary available

   This study uses JWST/NIRSpec to characterize a highly magnified object behind a lensing cluster, but the object is a star rather than a supernova.

   Abstract

   We present JWST/NIRSpec observations of a highly magnified star candidate at a photometric redshift of $z_{\mathrm{phot}}\simeq4.8$, previously detected in JWST/NIRCam imaging of the strong lensing (SL) cluster MACS J0647+7015 ($z=0.591$). The spectroscopic observation allows us to precisely measure the redshift of the host arc at $z_{\mathrm{spec}}=4.758\pm0.004$, and the star's spectrum displays clear Lyman- and Balmer-breaks commensurate with this redshift. A fit to the spectrum suggests a B-type super-giant star of surface temperature $T_{\mathrm{eff,B}}\simeq15000$ K with either a redder F-type companion ($T_{\mathrm{eff,F}}\simeq6250$K) or significant dust attenuation ($A_V\simeq0.82$)…

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   Extreme Stellar Death and Galaxy Feedback at z = 2: A Rest-frame Ultraviolet Characterization of the Strongly Lensed Superluminous Supernova 2025wny

   Willem B. Hoogendam, David O. Jones, C. Storfer et al. · 2026 · Not summarized yet

   This paper studies a strongly lensed high-redshift supernova using spectroscopy and photometry, though it examines a superluminous event rather than a Type IIb.

   Abstract

   We present photometric and spectroscopic follow-up observations of the strongly-lensed H-poor superluminous supernova (SLSN) 2025wny at $z = 2.0155$. We use integral-field Keck-II/KCWI spectroscopy to obtain rest-frame ultraviolet spectra spanning $11$ to $61$ days after maximum light. We use Pan-STARRS photometry to constrain the brightest image's magnification, finding $\mu_A=19.4\pm1.6$, a factor of $\sim$2-4 higher than mass-modeling estimates. We fit the Pan-STARRS photometry with a magnetar energy-injection model including $^{56}$Ni decay using the Modular Open Source Fitter for Transients (MOSFiT); the model can reproduce the near-maximum light curve with parameters typical of local u…

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   Multi-Wavelength Identification of a Luminous Mid-Infrared Supernova Powered by Circumstellar Interaction with Binary-Driven Pre-supernova Mass Loss

   K. Uno, K. De, G. Mo et al. · 2026 · Not summarized yet

   This paper investigates a core-collapse supernova's classification and evolution through multi-wavelength observations, focusing on circumstellar interaction rather than lensing.

   Abstract

   Terminal mass-loss in massive stars is commonly reconstructed from observations of circumstellar interaction in core-collapse supernovae (CCSNe); however, such signatures can be easily missed depending on the phase when they appear. In this paper, we present a multi-wavelength study of SN\,2022yyz, a nearby CCSN selected by its luminous late-time mid-infrared (MIR) excess in NEOWISE at $>500$ days after the discovery. Classified as a Type II SN at discovery, it reached a peak bolometric luminosity of $1.3^{+0.7}_{-0.4}\times10^{43}$ erg s$^{-1}$ before fading away with a light-curve drop at $\sim 300$ days. We present late-time HST/WFC3 ultraviolet (UV) imaging and Keck/LRIS spectroscopy at …

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   Gravitational lensing of the farthest known supernova SN1997ff

   Edvard Moertsell, Christofer Gunnarsson, Ariel Goobar · 2001 · ApJ, 561, 106 (2001) · cited 23 times · AI summary available

   This study analyzes how gravitational lensing affects a distant supernova and cautions that lens-model uncertainty limits its use for cosmological constraints.

   Abstract

   We investigate the effects of gravitational lensing due to intervening galaxies on the recently discovered Type Ia supernova at z=1.7, SN1997ff, in the Hubble Deep Field North. We find that it is possible to obtain a wide range of magnifications by varying the mass and/or the velocity dispersion normalization of the lensing galaxies. In order to be able to use SN1997ff to constrain the redshift-distance relation, very detailed modeling of the galaxies to control the systematic effects from lensing is necessary. Thus we argue, that based on our current limited knowledge of the lensing galaxies, it is difficult to use SN1997ff to constrain the values of Omega_M and Omega_Lambda, or even to pla…

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   UNCOVER: A NIRSpec Identification of a Broad Line AGN at z = 8.50

   Vasily Kokorev, Seiji Fujimoto, Ivo Labbe et al. · 2023 · Astrophysics of Galaxies · cited 144 times · AI summary available

   This study uses JWST/NIRSpec to identify a high-redshift object behind a lensing survey, but investigates an active galactic nucleus rather than a supernova.

   Abstract

   Deep observations with JWST have revealed an emerging population of red point-like sources that could provide a link between the postulated supermassive black hole seeds and observed quasars. In this work we present a JWST/NIRSpec spectrum from the JWST Cycle 1 UNCOVER Treasury survey, of a massive accreting black hole at $z=8.50$, displaying a clear broad-line component as inferred from the H$\beta$ line with FWHM = $3439\pm413$ km s$^{-1}$, typical of the broad line region of an active galactic nucleus (AGN). The AGN nature of this object is further supported by high ionization, as inferred from emission lines, and a point-source morphology. We compute the black hole mass of log$_{10}(M_{\…

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   UNCOVER: A NIRSpec Census of Lensed Galaxies at z=8.50-13.08 Probing a High AGN Fraction and Ionized Bubbles in the Shadow

   Seiji Fujimoto, Bingjie Wang, John Weaver et al. · 2023 · Astrophysics of Galaxies · cited 45 times · AI summary available

   This study uses NIRSpec to confirm redshifts for lensed high-redshift galaxies, rather than classifying a lensed supernova.

   Abstract

   We present JWST NIRSpec prism spectroscopy of gravitationally lensed galaxies at $z\gtrsim9$ found behind the massive galaxy cluster Abell 2744 in the UNCOVER Cycle 1 Treasury Program. We confirm the source redshift via emission lines and/or the Ly$\alpha$ break feature for ten galaxies at z=8.50-13.08 down to $M_{\rm UV}=-17.3$. We achieve a high confirmation rate of 100\% for $z>9$ candidates reported in Atek et al. (2023). Using six sources with multiple emission line detections, we find that the offset of the redshift estimates between the lines and the Ly$\alpha$ break alone with prism can be as large as $\pm0.2$, raising caution in designing future follow-up spectroscopy for the break-…