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Axion Emission from Strange Matter in Core-Collapse SNe.
Phys Rev Lett
September 2024
LAPTh, Université Savoie Mont-Blanc et CNRS, 74941 Annecy, France.
The duration of the neutrino burst from the supernova event SN 1987A is known to be sensitive to exotic sources of cooling, such as axions radiated from the dense and hot hadronic matter thought to constitute the inner core of the supernova. We perform the first quantitative study of the role of hadronic matter beyond the first generation--in particular strange matter. We do so by consistently including the full baryon and meson octets, and computing axion emissivity induced from baryon-meson to baryon-axion scatterings as well as from baryon decays.
View Article and Find Full Text PDFLoss of Coherence and Change in Emission Physics for Radio Emission from Very Inclined Cosmic-Ray Air Showers.
Phys Rev Lett
June 2024
Sorbonne Université, CNRS, UMR 7095, Institut d'Astrophysique de Paris, 98 bis bd Arago, 75014 Paris, France.
Next-generation radio experiments such as the radio detector of the upgraded Pierre Auger Observatory and the planned GRAND and BEACON arrays target the detection of ultra-high-energy particle air showers arriving at low elevation angles. These inclined cosmic-ray air showers develop higher in the atmosphere than vertical ones, enhancing magnetic deflections of electrons and positrons inside the cascade. We evidence two novel features in their radio emission: a new polarization pattern, consistent with a geosynchrotron emission model and a coherence loss of the radio emission, both for showers with zenith angle θ≳65° and strong enough magnetic field amplitude (typical strength of B∼50 μT).
View Article and Find Full Text PDFConstraints on Neutrino Natal Kicks from Black-Hole Binary VFTS 243.
Phys Rev Lett
May 2024
Department of Materials and Production, Aalborg University, Aalborg, Denmark.
The recently reported observation of VFTS 243 is the first example of a massive black-hole binary system with negligible binary interaction following black-hole formation. The black-hole mass (≈10M_{⊙}) and near-circular orbit (e≈0.02) of VFTS 243 suggest that the progenitor star experienced complete collapse, with energy-momentum being lost predominantly through neutrinos.
View Article and Find Full Text PDFNeutrino Signal from a Population of Seyfert Galaxies.
Phys Rev Lett
March 2024
Université Paris Cité, CNRS, Astroparticule et Cosmologie, F-75013 Paris, France.
IceCube Collaboration has previously reported evidence for a neutrino signal from a Seyfert galaxy NGC 1068. This may suggest that all Seyfert galaxies emit neutrinos. To test this hypothesis, we identify the best candidate neutrino sources among nearby Seyfert galaxies, based on their hard x-ray properties.
View Article and Find Full Text PDFEmission lines due to ionizing radiation from a compact object in the remnant of Supernova 1987A.
Science
February 2024
Institute of Astronomy, Katholieke Universiteit Leuven, 3001 Leuven, Belgium.
The nearby Supernova 1987A was accompanied by a burst of neutrino emission, which indicates that a compact object (a neutron star or black hole) was formed in the explosion. There has been no direct observation of this compact object. In this work, we observe the supernova remnant with JWST spectroscopy, finding narrow infrared emission lines of argon and sulfur.
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