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Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704
A. Sanna, A. Bahramian, E. Bozzo +15
We report the discovery of X-ray pulsations at 105.2 Hz (9.5 ms) from the transient X-ray binary IGR J16597-3704 using NuSTAR and Swift. The source was discovered by INTEGRAL in th…
Extreme Quiescent Variability of the Transient Neutron Star Low-mass X-ray Binary EXO 1745-248 in Terzan 5
L. E. Rivera Sandoval, R. Wijnands, N. Degenaar +9
EXO 1745-248 is a transient neutron-star low-mass X-ray binary that resides in the globular cluster Terzan 5. We studied the transient during its quiescent state using 18 Chandra o…
The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. III. Optical and UV Spectra of a Blue Kilonova From Fast Polar Ejecta
M. Nicholl, E. Berger, D. Kasen +31
We present optical and ultraviolet spectra of the first electromagnetic counterpart to a gravitational wave (GW) source, the binary neutron star merger GW170817. Spectra were obtai…
Constraining the Mass and Radius of Neutron Stars in Globular Clusters
A. W. Steiner, C. O. Heinke, S. Bogdanov +4
We analyze observations of eight quiescent low-mass X-ray binaries in globular clusters and combine them to determine the neutron star mass-radius curve and the equation of state o…
The ultracompact nature of the black hole candidate X-ray binary 47 Tuc X9
Arash Bahramian, Craig O. Heinke, Vlad Tudor +9
47 Tuc X9 is a low mass X-ray binary (LMXB) in the globular cluster 47 Tucanae, and was previously thought to be a cataclysmic variable. However, Miller-Jones et al. (2015) recentl…