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LOFAR Observations of Swift J1644+57 and Implications for Short-Duration Transients
Y. Cendes, R. A. M. J. Wijers, J. D. Swinbank +25
Aims: We have analyzed low frequency radio data of tidal disruption event (TDE) Swift J1644+57 to search for a counterpart. We consider how brief transient signals (on the order of…
Constraints on Relativistic Jets in Quiescent Black Hole X-ray Binaries from Broadband Spectral Modeling
Richard M. Plotkin, Elena Gallo, Sera Markoff +5
The nature of black hole jets at the lowest detectable luminosities remains an open question, largely due to a dearth of observational constraints. Here, we present a new, nearly-s…
New methods to constrain the radio transient rate: results from a survey of four fields with LOFAR
D. Carbone, A. J. van der Horst, R. A. M. J. Wijers +23
We report on the results of a search for radio transients between 115 and 190\,MHz with the LOw-Frequency ARray (LOFAR). Four fields have been monitored with cadences between 15 mi…
Variability of Optical Counterparts in the Chandra Galactic Bulge Survey
Christopher T. Britt, R. I. Hynes, C. B. Johnson +13
We present optical lightcurves of variable stars consistent with the positions of X-ray sources identified with the Chandra X-ray Observatory for the Chandra Galactic Bulge Survey.…
X-ray reflection in oxygen-rich accretion discs of ultra-compact X-ray binaries
O. K. Madej, J. Garcia, P. G. Jonker +4
We present spectroscopic X-ray data of two candidate ultra-compact X-ray binaries: 4U~0614+091 and 4U~1543624. We confirm the presence of a broad O VIII Ly reflection line (a…
Probing the Crust of the Neutron Star in EXO 0748-676
N. Degenaar, Z. Medin, A. Cumming +7
X-ray observations of quiescent X-ray binaries have the potential to provide insight into the structure and the composition of neutron stars. EXO 0748-676 had been actively accreti…