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The Emergence of a Lanthanide-Rich Kilonova Following the Merger of Two Neutron Stars
N. R. Tanvir, A. J. Levan, C. Gonzalez-Fernandez +51
We report the discovery and monitoring of the near-infrared counterpart (AT2017gfo) of a binary neutron-star merger event detected as a gravitational wave source by Advanced LIGO/V…
Swift and NuSTAR observations of GW170817: detection of a blue kilonova
P. A. Evans, S. B. Cenko, J. A. Kennea +56
With the first direct detection of merging black holes in 2015, the era of gravitational wave (GW) astrophysics began. A complete picture of compact object mergers, however, requir…
The X-ray counterpart to the gravitational wave event GW 170817
E. Troja, L. Piro, H. van Eerten +31
A long-standing paradigm in astrophysics is that collisions- or mergers- of two neutron stars (NSs) form highly relativistic and collimated outflows (jets) powering gamma-ray burst…
The Origin of r-Process Elements in the Milky Way
Benoit Côté, Chris L. Fryer, Krzysztof Belczynski +8
Some of the heavy elements, such as gold and europium (Eu), are almost exclusively formed by the rapid neutron capture process (r-process). However, it is still unclear which astro…
The first direct double neutron star merger detection: implications for cosmic nucleosynthesis
S. Rosswog, J. Sollerman, U. Feindt +4
The astrophysical r-process site where about half of the elements heavier than iron are produced has been a puzzle for several decades. Here we discuss the role of neutron star mer…
Light Curves and Spectra from a Unimodal Core-Collapse SuperNova
Ryan T. Wollaeger, Aimee L. Hungerford, Chris L. Fryer +3
To assess the effectiveness of optical emission as a probe of spatial asymmetry in core-collapse supernovae (CCSNe), we apply the radiative transfer software, \supernu, to a unimod…
Infrared emission from kilonovae: the case of the nearby short hard burst GRB 160821B
Mansi M. Kasliwal, Oleg Korobkin, Ryan M. Lau +2
We present constraints on Ks-band emission from one of the nearest short hard gamma-ray bursts, GRB 160821B, at z=0.16, at three epochs. We detect a reddened relativistic afterglow…
Impact of ejecta morphology and composition on the electromagnetic signatures of neutron star mergers
Ryan T. Wollaeger, Oleg Korobkin, Christopher J. Fontes +7
The electromagnetic transients accompanying compact binary mergers (-ray bursts, afterglows and 'macronovae') are crucial to pinpoint the sky location of gravitational wave sour…
A line-smeared treatment of opacities for the spectra and light curves from macronovae
Christopher J. Fontes, Chris L. Fryer, Aimee L. Hungerford +3
Gravitational wave observations need accompanying electromagnetic signals to accurately determine the sky positions of the sources. The ejecta of neutron star mergers are expected…