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neutron stars

This tag is associated with 9 posts

Making Lanthanide Metals…or Not

There aren’t many places in the universe that you can find a bunch of free neutrons not already trapped inside a nucleus—except in neutron stars. Luckily, neutron stars in violent mergers with other neutron stars, or with black holes, tend to disperse a little bit of their matter into the interstellar medium. Tidal forces eject some matter as the two objects swing around each other in their final orbits. Then, if an accretion disk forms, winds blown off the surface of the disk disperse even more matter. Surman and her colleagues look at the nucleosynthesis that occurs in this latter process, and find something surprising.

How Not Detecting Anything Can Be Useful

Null data are still data! Chen & Holz use a lack of detections to place a lower limit on the beaming angle of SGRBs.

Timing is Everything: A Pulsar in Orbit

One of nature’s best clocks is a millisecond pulsar. These exotic stellar corpses are neutron stars: incredibly dense, rotating hundreds of times per second, and emitting powerful jets or beams of light. This creates a “pulsing” effect, much like a lighthouse.

Do Fast Radio Bursts come from neutron star mergers?

Recently, a population of short (a few micro-seconds) and energetic radio bursts were identified at cosmological distances. Today’s paper hypothesizes that these “Fast Radio Bursts” may be created in the final moments of a neutron star merger.

Behind the Scenes of Supernovae Explosions: The Violent Birth of Neutron Stars

Recent computer simulations are shedding light on the brightest and most energetic phenomena in the Universe – supernova explosions. A team of researchers at the Max Planck Institute for Astrophysics modeled the formation of neutron stars in three dimensions with unprecedented accuracy, showing that as matter is drawn inward, it sloshes both asymmetrically and in spiral motions. It’s a bold, new look into the center of the supernova explosion and the birth of a neutron star.

The Christmas Burst: GRB 101225A Explained?

Last year on Christmas day, scientists observed a unique gamma-ray burst, GRB 101225A. Two interesting and very different models have developed for the ‘Christmas burst:’ a tidal disruption of a comet by a neutron star somewhere in our Galaxy, or a neutron star consuming its companion star over 5 billion light years away.

How Type II Supernovae Kick Neutron Stars

Nordhaus et al perform simulations to show that normal type II supernovae can produce pulsar kicks which match the observed velocities of neutron stars.

The youngest millisecond pulsar yet?

Title: Fermi Detectiqon of a Luminous γ–ray Pulsar in a Globular Cluster Authors: The Fermi LAT Collaboration Principle Investigator: Dr. Peter Michelson, Stanford University The Fermi Large Area Telescope, which was launched in 2008, is a gamma ray space telescope which can observe high-energy photons with energies ranging between 20 MeV and 300 GeV. These […]

Evidence for Two Kinds of Pulsars

This paper presents the first evidence of two distinct populations of pulsars, which the authors speculate stem from a difference in how they are formed.

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