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1. Interaction of a Supernova with a Circumstellar Disk

   https://doi.org/10.3847/1538-4357/aaa96e  

   McDowell, Austin T.; Duffell, Paul C.; Kasen, Daniel (March 2018, The Astrophysical Journal)
2. DES16C3cje: A low-luminosity, long-lived supernova

   https://doi.org/10.1093/mnras/staa1452  

   Gutiérrez, C P; Sullivan, M; Martinez, L; Bersten, M C; Inserra, C; Smith, M; Anderson, J P; Pan, Y-C; Pastorello, A; Galbany, L; et al (July 2020, Monthly Notices of the Royal Astronomical Society)

   ABSTRACT We present DES16C3cje, a low-luminosity, long-lived type II supernova (SN II) at redshift 0.0618, detected by the Dark Energy Survey (DES). DES16C3cje is a unique SN. The spectra are characterized by extremely narrow photospheric lines corresponding to very low expansion velocities of ≲1500 km s−1, and the light curve shows an initial peak that fades after 50 d before slowly rebrightening over a further 100 d to reach an absolute brightness of Mr ∼ −15.5 mag. The decline rate of the late-time light curve is then slower than that expected from the powering by radioactive decay of 56Co, but is comparable to that expected from accretion power. Comparing the bolometric light curve with hydrodynamical models, we find that DES16C3cje can be explained by either (i) a low explosion energy (0.11 foe) and relatively large 56Ni production of 0.075 M⊙ from an ∼15 M⊙ red supergiant progenitor typical of other SNe II, or (ii) a relatively compact ∼40 M⊙ star, explosion energy of 1 foe, and 0.08 M⊙ of 56Ni. Both scenarios require additional energy input to explain the late-time light curve, which is consistent with fallback accretion at a rate of ∼0.5 × 10−8 M⊙ s−1. 

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3. A JWST Survey of the Supernova Remnant Cassiopeia A

   https://doi.org/10.3847/2041-8213/ad324b  

   Milisavljevic, Dan; Temim, Tea; De_Looze, Ilse; Dickinson, Danielle; Laming, J_Martin; Fesen, Robert; Raymond, John_C; Arendt, Richard_G; Vink, Jacco; Posselt, Bettina; et al (April 2024, The Astrophysical Journal Letters)

   Abstract We present initial results from a James Webb Space Telescope (JWST) survey of the youngest Galactic core-collapse supernova remnant, Cassiopeia A (Cas A), made up of NIRCam and MIRI imaging mosaics that map emission from the main shell, interior, and surrounding circumstellar/interstellar material (CSM/ISM). We also present four exploratory positions of MIRI Medium Resolution Spectrograph integral field unit spectroscopy that sample ejecta, CSM, and associated dust from representative shocked and unshocked regions. Surprising discoveries include (1) a weblike network of unshocked ejecta filaments resolved to ∼0.01 pc scales exhibiting an overall morphology consistent with turbulent mixing of cool, low-entropy matter from the progenitor’s oxygen layer with hot, high-entropy matter heated by neutrino interactions and radioactivity; (2) a thick sheet of dust-dominated emission from shocked CSM seen in projection toward the remnant’s interior pockmarked with small (∼1″) round holes formed by ≲0.″1 knots of high-velocity ejecta that have pierced through the CSM and driven expanding tangential shocks; and (3) dozens of light echoes with angular sizes between ∼0.″1 and 1′ reflecting previously unseen fine-scale structure in the ISM. NIRCam observations place new upper limits on infrared emission (≲20 nJy at 3μm) from the neutron star in Cas A’s center and tightly constrain scenarios involving a possible fallback disk. These JWST survey data and initial findings help address unresolved questions about massive star explosions that have broad implications for the formation and evolution of stellar populations, the metal and dust enrichment of galaxies, and the origin of compact remnant objects. 

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4. A successful 3D core-collapse supernova explosion model

   https://doi.org/10.1093/mnras/sty2585  

   Vartanyan, David; Burrows, Adam; Radice, David; Skinner, M Aaron; Dolence, Joshua (September 2018, Monthly Notices of the Royal Astronomical Society)
5. Discovery of a Double-detonation Thermonuclear Supernova Progenitor

   https://doi.org/10.3847/2041-8213/ac48f1  

   Kupfer, Thomas; Bauer, Evan B.; van Roestel, Jan; Bellm, Eric C.; Bildsten, Lars; Fuller, Jim; Prince, Thomas A.; Heber, Ulrich; Geier, Stephan; Green, Matthew J.; et al (January 2022, The Astrophysical Journal Letters)

   Abstract We present the discovery of a new double-detonation progenitor system consisting of a hot subdwarf B (sdB) binary with a white dwarf companion with aP_orb= 76.34179(2) minutes orbital period. Spectroscopic observations are consistent with an sdB star during helium core burning residing on the extreme horizontal branch. Chimera light curves are dominated by ellipsoidal deformation of the sdB star and a weak eclipse of the companion white dwarf. Combining spectroscopic and light curve fits, we find a low-mass sdB star,M_sdB= 0.383 ± 0.028M_⊙with a massive white dwarf companion,M_WD= 0.725 ± 0.026M_⊙. From the eclipses we find a blackbody temperature for the white dwarf of 26,800 K resulting in a cooling age of ≈25 Myr whereas ourMESAmodel predicts an sdB age of ≈170 Myr. We conclude that the sdB formed first through stable mass transfer followed by a common envelope which led to the formation of the white dwarf companion ≈25 Myr ago. Using theMESAstellar evolutionary code we find that the sdB star will start mass transfer in ≈6 Myr and in ≈60 Myr the white dwarf will reach a total mass of 0.92M_⊙with a thick helium layer of 0.17M_⊙. This will lead to a detonation that will likely destroy the white dwarf in a peculiar thermonuclear supernova. PTF1 J2238+7430 is only the second confirmed candidate for a double-detonation thermonuclear supernova. Using both systems we estimate that at least ≈1% of white dwarf thermonuclear supernovae originate from sdB+WD binaries with thick helium layers, consistent with the small number of observed peculiar thermonuclear explosions. 

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