Results 21 to 30 of about 695 (169)
Type II supernova diversity [PDF]
Proceedings of the International Astronomical Union, 2015 AbstractIt is now firmly established that at a significant fraction of hydrogen-rich type II supernovae (SNe II) arise from red supergiant progenitors. However, a large diversity of SN properties exist, and it is presently unclear how this can be understood in terms of progenitor differences and pre-SN stellar evolution. In this contribution, I present
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The Dusty Red Supergiant Progenitor and the Local Environment of the Type II SN 2023ixf in M101
The Astrophysical Journal Letters, 2023 As one of the closest supernovae (SNe) in the last decade, SN 2023ixf is an unprecedented target to investigate the progenitor star that exploded. However, there is still significant uncertainty in the reported progenitor properties.
Zexi Niu +5 more
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An updated Type II supernova Hubble diagram [PDF]
Astronomy & Astrophysics, 2018 We present photometry and spectroscopy of nine Type II-P/L supernovae (SNe) with redshifts in the 0.045 ≲z≲ 0.335 range, with a view to re-examining their utility as distance indicators. Specifically, we apply the expanding photosphere method (EPM) and the standardized candle method (SCM) to each target, and find that both methods yield distances that ...
Gall, E. E. E. +17 more
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Neutrino Transport in a Type II Supernova Environment [PDF]
International Astronomical Union Colloquium, 1986 AbstractWe discuss the full problem of neutrino transport in the context of a Type II supernova environment. We describe the “standard model” of Type II supernova, which involves the core collapse and core bounce of an 8 — 20M⊙ star. Although the shock produced in the standard model is supposed to expel the outer layers of the star, this does not ...
Paul J. Schinder, Stuart L. Shapiro
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Nlte-Effects in Supernovae Type II Photospheres [PDF]
Highlights of Astronomy, 1986 AbstractIn order to provide accurate fluxes of supernovae Type II as needed for the application of the Baade-Wesselink method we have constructed spherical model photospheres for these objects under the assumption that hydrogen and helium are in statistical equilibrium.
P. Höflich, R. Wehrse, G. Shaviv
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The Astrophysical Journal Letters, 2023 We present preexplosion optical and infrared (IR) imaging at the site of the type II supernova (SN II) 2023ixf in Messier 101 at 6.9 Mpc. We astrometrically registered a ground-based image of SN 2023ixf to archival Hubble Space Telescope (HST), Spitzer ...
Charles D. Kilpatrick +19 more
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On the Explosion of Type II Supernova [PDF]
Progress of Theoretical Physics, 1963 Various nuclear reactions that takes place after the collapse of a stellar core caused by Fe yields He reaction at the iron core of aged massive stars are investigated, and it is shown that an enormous amount of energy from rapid nuclear reactions among light elements such as oxygen and carbon gives rise to the generation of shock waves.
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Progenitors and Hydrodynamics of Type II and lb Supernovae [PDF]
International Astronomical Union Colloquium, 1996 We review critical physics affecting the observational characteristics of those supernovae that occur in massive stars. Particular emphasis is given to 1) how mass loss, either to a binary companion or by a radiatively driven wind, affects the type and light curve of the supernova, and 2) the interaction of the outgoing supernova shock with regions of ...
S. E. Woosley +2 more
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SN 2023ixf in the Pinwheel Galaxy M101: From Shock Breakout to the Nebular Phase
The Astrophysical JournalWe present photometric and spectroscopic observations of supernova SN 2023ixf covering from day 1 to 442 days after explosion. SN 2023ixf reached a peak V -band absolute magnitude of −18.2 ± 0.07, and light curves show that it has a relatively short ...
WeiKang Zheng +41 more
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DUST AND THE TYPE II-PLATEAU SUPERNOVA 2004et [PDF]
The Astrophysical Journal, 2009 We present mid-infrared (MIR) observations of the Type II-plateau supernova (SN) 2004et, obtained with the {\it Spitzer Space Telescope} between days 64 and 1406 past explosion. Late-time optical spectra are also presented. For the period 300-795 days past explosion, we argue that the spectral energy distribution of SN 2004et comprises (a) a hot ...
Kotak, R. +16 more
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