“Supernova” Science-Research, August 2021 — summary from DOE Pages, Astrophysics Data System and DOAJ

DOE Pages — summary generated by Brevi Assistant

Below we offer a study of the early advancement of 12 Type IIn supernovae at ultraviolet and noticeable light wavelengths. ABSTRACT We check out the contribution of sub-Chandrasekhar mass Type Ia supernovae to the chemical enrichment of the Gaia Sausage galaxy, the progenitor of a considerable merger occasion in the early life of the Milky Way. The in-depth nature of type Ia supernovae remains uncertain, and as study stats increase, the concern of astrophysical systematic uncertainties occurs, especially that of the advancement of SN Ia populations. We modeled the underlying stretch circulation as a function of redshift, making use of the development of the portion of old and young SNe Ia as anticipated using the SNfactory dataset, and assuming a continuous underlying stretch distribution for every age population including Gaussian mixtures. Stars in the mass variety from 8 M ⊙ to 10 M ⊙ are anticipated to generate a couple of sorts of supernovae, either electron-capture supernovae or core-collapse supernovae, depending upon their previous evolution. The SN from the 9 M ⊙ progenitor stays the ideal candidate for so-called low-luminosity SNe IIP like SN 1999br and SN 2005cs. ABSTRACT The evaluation of future and present cosmological surveys of Type Ia supernovae at high redshift relies on the precise photometric classification of the SN events identified. Getting reasonable simulations of photometric SN surveys comprises an essential action for training and screening photometric category algorithms, and for fixing predispositions introduced by option impacts and contamination occurring from core-collapse SNe in the photometric SN Ia samples. In this work, we present the first Hubble representation of superluminous supernovae out to a redshift of two, along with restraints on the matter thickness, Ω M, and the dark energy equation-of-state criterion, w. We provide simulations of future studies with 868 and 492 SLSNe I and show that such a sample can supply cosmological restrictions in a level ΛCDM version with the same accuracy as current studies that use Type Ia supernovae, while giving a factor of 2–3 renovation in the accuracy of the restraints on the moment variant of dark energy, w 0 and w a This paper represents the proof of idea for superluminous supernova cosmology, and demonstrates they can supply an independent examination of cosmology in the high-redshift universe.

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Astrophysics Data System — summary generated by Brevi Assistant

A recent measurement of the correct motion of PSR J0908–4913 shows that it is a fast-moving item at a range of some 3 kpc. We reveal that the rotation axis of the pulsar points in the instructions of the correct motion. In this paper, we evaluate the JLA data on Supernova observations in the context of k- significance dark energy version with Lagrangian L=VF with a constant prospective V and the dynamical term X = ∇_μϕ∇_νϕ= ϕ̇²/2 for an uniform scalar area ϕ in a level FRW spacetime history. Scaling relations are utilized to extract temporal behaviour of various cosmological amounts and the kind of the function F from the data. There is a vast consensus that Type Ia supernovae originate from the atomic explosion of Carbon Monoxide white dwarfs, with the absence of hydrogen in the observed ranges as an unique function. An additional probable sequence of events is a weak SN ejecta interaction with an H shell expelled by optically thick winds or a nova-like eruption on the CO WD progenitor some years before the SN explosion. We re-examine the contentious concern of restraints on anisotropic expansion from Type Ia supernovae in the light of a novel determination of peculiar velocities, which are essential to examine isotropy with supernovae out to ranges ≲200/h Mpc. We adopt the Bayesian hierarchical model extttBAHAMAS to constrain a dipole in the range modulus in the context of the Λ CDM version and the deceleration criterion in a phenomenological Cosmographic growth. We offer photometry, ranges, and spectropolarimetry of supernova 2014ab, acquired via ~ 200 d after peak brightness. SN 2014ab was a luminous Type IIn SN discovered after peak brightness near the nucleus of its host galaxy, VV 306c. Type Ibn supernovae are a rare course of stripped envelope supernovae connecting with a helium-rich circumstellar tool. Approaches: We contrast the photometric and spectral evolution of SN 2020bqj with routine SNe Ibn from the literary works, along with various other outliers in the SN Ibn subclass.

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DOAJ — summary generated by Brevi Assistant

Examples of two deep-sea sediment cores from the Indian Ocean are analyzed with accelerator mass spectrometry to look for traces of current supernova activity ~ 2 Myr earlier. Core Collapse Supernovae are explosive sensations that may occur at the end of the life of substantial stars, releasing over 99% of the energy through neutrino discharge with powers on the 10 MeV range. The neutrino-induced nucleosynthesis in supernova surges of substantial stars of solar metallicity with initial primary series masses between 15 and 40 M ⊙ has been examined. Neutrino emission and their transport of energy to the supernova shock area are delicate to the physics of warm and thick nuclear matter, which is a facility issue due to the solid connections caused by nuclear pressures. The neutrino-induced nucleosynthesis in supernova surges of enormous stars of solar metallicity with initial main sequence masses in between 13 and 30 M ⊙ has been researched with an analytic explosion version making use of a new considerable collection of neutrino-nucleus cross-sections and spooky properties that concur with contemporary supernova simulations. We research the possible contribution of the innermost supernova expel to the production of the light components 7Li and 11B with tracer fragments based on a 2D supernova simulation of a 12 M ⊙ progenitor and conclude, that a contribution exists but is minimal for the total yield for this surge model. We make use of 3D numerical simulations to research the development of the Hα strength and speed diffusion for solitary and multiple supernova explosions. Weakening the spatial resolution in the Hα strength and rate dispersion maps makes the substitute IHα — σ layouts near those observed in dwarf galaxies not just in shape, yet additionally quantitatively.

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