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Structure of the Se Isomers─An Ab Initio Study.
J Phys Chem A
January 2025
Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
This study investigates the equilibrium geometries of four different Se isomers using the coupled cluster single and double perturbative (CCSD(T)) method, extrapolating to the complete basis sets. The ground-state geometry of the Se isomer with the C structure (2.8715 Å, 2.
View Article and Find Full Text PDFBinary progenitor systems for Type Ic supernovae.
Nat Commun
September 2024
Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, Poznań, Poland.
Core-collapse supernovae are explosions of massive stars at the end of their evolution. They are responsible for metal production and for halting star formation, having a significant impact on galaxy evolution. The details of these processes depend on the nature of supernova progenitors, but it is unclear if Type Ic supernovae (without hydrogen or helium lines in their spectra) originate from core-collapses of very massive stars (>30 M) or from less massive stars in binary systems.
View Article and Find Full Text PDFMost nearby young star clusters formed in three massive complexes.
Nature
July 2024
Landessternwarte, Zentrum für Astronomie der Universität Heidelberg, Heidelberg, Germany.
Efforts to unveil the structure of the local interstellar medium and its recent star-formation history have spanned the past 70 years (refs. ). Recent studies using precise data from space astrometry missions have revealed nearby, newly formed star clusters with connected origins.
View Article and Find Full Text PDFSharp Rise in Cosmic Ray Irradiation of Organisms on Earth Caused by a Nearby SN Shockwave Passage.
Astrobiology
June 2024
Ioffe Institute of Russian Academy of Sciences, Saint-Petersburg, Russia.
The work considers the modelling of nearby supernova (SN) effects on Earth's biosphere via cosmic rays (CRs) accelerated by shockwaves. The rise of the radiation background on Earth resulted from the external irradiation by CR high-energy particles and internal radiation in organisms by the decay of cosmogenic C is evaluated. We have taken into account that the CR flux near Earth goes up steeply when the shockwave crosses the Solar System, while in previous works the CR transport was considered as purely diffusive.
View Article and Find Full Text PDFResonances of Supernova Neutrinos in Twisting Magnetic Fields.
Phys Rev Lett
March 2024
Instituto de Física Gleb Wataghin - UNICAMP, 13083-859, Campinas, São Paulo, Brazil.
We investigate the effect of resonant spin conversion of the neutrinos induced by the geometrical phase in a twisting magnetic field. We find that the geometrical phase originating from the rotation of the transverse magnetic field along the neutrino trajectory can trigger a resonant spin conversion of Dirac neutrinos inside the supernova, even if there were no such transitions in the fixed-direction field case. We have shown that, even though resonant spin conversion is too weak to affect solar neutrinos, it could have a remarkable consequence on supernova neutronization bursts where very intense magnetic fields are quite likely.
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