Evidence Suggests a Possible Superkilonova Hidden Within a Supernova
📰 Original title: Astronomers may have found a strange new kind of cosmic explosion
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View full AI summary: https://killbait.com/en/evidence-suggests-a-possible-superkilonova-hidden-within-a-supernova/?redirpost=283df76d-d340-4724-a8dd-f641037071eb
Evidence Suggests a Possible Superkilonova Hidden Within a Supernova
📰 Original title: Astronomers may have found a strange new kind of cosmic explosion
🤖 IA: It's not clickbait ✅
👥 Usuarios: It's not clickbait ✅
View full AI summary: https://killbait.com/en/evidence-suggests-a-possible-superkilonova-hidden-within-a-supernova/?redirpost=283df76d-d340-4724-a8dd-f641037071eb
📄 A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimati…
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Riley, T. E. et al. (2019) · The Astrophysical Journal
Reads: 326 · Citations: 1622
DOI: 10.3847/2041-8213/ab481c
🔗 https://ui.adsabs.harvard.edu/abs/2019ApJ...887L..21R/abstract
#Astronomy #Astrophysics #NeutronStars #MatterDensity #RotationPoweredPulsars
We report on Bayesian parameter estimation of the mass and equatorial radius of the millisecond pulsar PSR J0030+0451, conditional on pulse-profile modeling of Neutron Star Interior Composition Explorer X-ray spectral-timing event data. We perform relativistic ray-tracing of thermal emission from hot regions of the pulsar’s surface. We assume two distinct hot regions based on two clear pulsed components in the phase-folded pulse-profile data; we explore a number of forms (morphologies and topologies) for each hot region, inferring their parameters in addition to the stellar mass and radius. For the family of models considered, the evidence (prior predictive probability of the data) strongly favors a model that permits both hot regions to be located in the same rotational hemisphere. Models wherein both hot regions are assumed to be simply connected circular single-temperature spots, in particular those where the spots are assumed to be reflection-symmetric with respect to the stellar origin, are strongly disfavored. For the inferred configuration, one hot region subtends an angular extent of only a few degrees (in spherical coordinates with origin at the stellar center) and we are insensitive to other structural details; the second hot region is far more azimuthally extended in the form of a narrow arc, thus requiring a larger number of parameters to describe. The inferred mass M and equatorial radius R <SUB>eq</SUB> are, respectively, {1.34}<SUB>-0.16</SUB><SUP>+0.15</SUP> {M}<SUB>☉ </SUB> and {12.71}<SUB>-1.19</SUB><SUP>+1.14</SUP> {km}, while the compactness {GM}/{R}<SUB>eq</SUB>}{c}<SUP>2</SUP>={0.156}<SUB>-0.010</SUB><SUP>+0.008</SUP> is more tightly constrained; the credible interval bounds reported here are approximately the 16% and 84% quantiles in marginal posterior mass.
#BlackHoles and #NeutronStars: 218 Mergers and Counting
#Astronomy #Picture of the Day
NASA’s Hubble Revisits Crab Nebula to Track 25 Years of Expansion
Study Reveals How Neutron Star Mergers Spread Precious Metals Across the Universe
📰 Original title: Astrophysicists trace the origin of valuable metals in space, from colliding stars to merging galaxies
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View full AI summary: https://killbait.com/en/study-reveals-how-neutron-star-mergers-spread-precious-metals-across-the-universe/?redirpost=70bd3849-a85d-430e-bd44-c5113372f5d4
NASA Discovers Crash of Extreme Stars in Unexpected Site
What's inside neutron stars? New model could sharpen gravitational-wave 'tide' clues
https://phys.org/news/2026-03-neutron-stars-sharpen-gravitational-tide.html
Neutron stars harbor some of the most extreme environments in the universe: their densities soar to several times those of atomic nuclei, and they possess some of the strongest gravitational fields of any known objects, surpassed only by black holes. First observed in the 1960s, much of the internal composition of neutron stars is still unknown. Scientists are beginning to look to gravitational waves emitted by binary neutron‐star inspirals—pairs of mutually orbiting neutron stars—as possible sources of information about their interiors.
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