Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Can jets make the radioactively powered emission from neutron star
  mergers bluer?   Neutron star mergers eject neutron-rich matter in which heavy elements are
synthesised. The decay of these freshly synthesised elements powers
electromagnetic transients ("macronovae" or "kilonovae") whose luminosity and
colour strongly depend on their nuclear composition. If the ejecta are very
neutron-rich (electron fraction $Y_\mathrm{e} < 0.25$), they contain fair
amounts of lanthanides and actinides which have large opacities and therefore
efficiently trap the radiation inside the ejecta so that the emission peaks in
the red part of the spectrum. Even small amounts of this high-opacity material
can obscure emission from lower lying material and therefore act as a
"lanthanide curtain". Here, we investigate how a relativistic jet that punches
through the ejecta can potentially push away a significant fraction of the high
opacity material before the macronova begins to shine. We use the results of
detailed neutrino-driven wind studies as initial conditions and explore with 3D
special relativistic hydrodynamic simulations how jets are propagating through
these winds. Subsequently, we perform Monte Carlo radiative transfer
calculations to explore the resulting macronova emission. We find that the hole
punched by the jet makes the macronova brighter and bluer for on-axis observers
during the first few days of emission, and that more powerful jets have larger
impacts on the macronova.

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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph