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astrophysics

This tag is associated with 58 posts

Orderly disorder: Simulations of planet-disk dynamics with AREPO

Only the combined effort of observational and theoretical methods can really bring us to a more thorough understanding of the Universe throughout all spatial scales. The authors of today’s paper use and adapt the moving-mesh fluid mechanics code AREPO to function with protoplanetary disks and test its imprint on the potential of planets to open up gaps in the surrounding gas.

Making Order Out of Chaos

On Earth, the chaotic nature of weather leads to the famous “butterfly effect”, in which the flapping of a butterfly’s wings can theoretically create a hurricane. Chaos is a fundamental element of nature which can arise in many environments–including stars.

Chondrule formation by shocks?

Chondrules are among the oldest components of the solar system and give insight in the solar system’s earliest phase. But how are they formed? In shocks? That seems to be at least difficult.

Can gamma ray bursts be used as standard candles?

Some GRB-SNe pairs show interesting correlations across their light curves.

Massive Stars Don’t Make Good Neighbors

Massive stars emit energetic radiation and expel strong winds that can disrupt their natal environments. New simulations show that these effects are important in the evolution of stellar nurseries and can account for some of the observed low efficiency of star formation.

Tracking the Accretion Flow Geometry Around Black Holes

By looking at the spectral changes of the accretion disk emission around black holes, we can trace the physical changes of the accreting material.

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.

Supernovae Photospheres as Distance Indicators

By examining their expansion rate over time, Type II supernovae provide a way to measure extragalactic distances.

Pictures of Gravity

Field lines are a powerful tool for building intuition for a complex geometric object.

The effect of magnetic fields on star formation

Boss & Keiser examine how magnetic fields with varying initial conditions affect star formation.

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