2026-09-24 コペンハーゲン大学（UCPH）
A new high-definition image from NASA’s James Webb Space Telescope’s NIRCam (Near-Infrared Camera) unveils intricate details of supernova remnant Cassiopeia A (Cas A), and shows the expanding shell of material slamming into the gas shed by the star before it exploded. Credit: NASA, ESA, CSA, STScI, Danny Milisavljevic (Purdue University), Ilse De Looze (UGhent), Tea Temim (Princeton University)
＜関連情報＞
- https://news.ku.dk/all_news/2026/09/supernova-or-black-hole-ghost-particles-flavor-may-determine-the-fate-of-dying-stars/
- https://journals.aps.org/prd/abstract/10.1103/pz3y-3lv5
ニュートリノのフレーバー変換が、崩壊型超新星爆発の失敗率を左右する Neutrino flavor conversion shapes the rate of failed core-collapse supernovae
Mariam Gogilashvili and Irene Tamborra
Physical Review D Published: 22 September, 2026
DOI: https://doi.org/10.1103/pz3y-3lv5
Abstract
The relative rate of neutron stars and black holes produced by the collapse of massive stars is highly uncertain. We simulate the stellar collapse of 195 progenitors with masses between 9⊙ and 120⊙, incorporating a schematic treatment of neutrino flavor conversion. We find that flavor transformation reshapes the explodability of massive stars—especially in the 16–30⊙ mass range—and modifies the compact remnant mass distribution. Our findings identify neutrino flavor conversion as a fundamental ingredient in predicting neutron star and black hole populations, while naturally easing the red-supergiant and the supernova-rate problems, as well as reconciling theoretical expectations with the low-mass tail of the observed neutron star mass distribution.
