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An elevation of 0.1 light-seconds for the optical jet base in an accreting Galactic black hole system
Poshak Gandhi, Matteo Bachetti, Vik S. Dhillon +25
Relativistic plasma jets are observed in many accreting black holes. According to theory, coiled magnetic fields close to the black hole accelerate and collimate the plasma, leadin…
Evolutionary Constraints on the Long-period Subdwarf B Binary PG 1018-047
J. Deca, J. Vos, P. Németh +4
We have revisited the sdB+K-star long-period binary PG 1018-047 based on 20 new high-resolution VLT/UVES spectra that provided regular coverage over a period of more than 26 months…
White Dwarf Rotation as a Function of Mass and a Dichotomy of Mode Linewidths: Kepler Observations of 27 Pulsating DA White Dwarfs Through K2 Campaign 8
J. J. Hermes, B. T. Gaensicke, Steven D. Kawaler +15
We present photometry and spectroscopy for 27 pulsating hydrogen-atmosphere white dwarfs (DAVs, a.k.a. ZZ Ceti stars) observed by the Kepler space telescope up to K2 Campaign 8, an…
A search for optical bursts from the repeating fast radio burst FRB 121102
Liam K Hardy, Vik S Dhillon, Laura G Spitler +14
We present a search for optical bursts from the repeating fast radio burst FRB 121102 using simultaneous observations with the high-speed optical camera ULTRASPEC on the 2.4-m Thai…
Two white dwarfs in ultrashort binaries with detached, eclipsing, likely substellar companions detected by K2
S. G. Parsons, J. J. Hermes, T. R. Marsh +19
Using data from the extended Kepler mission in K2 Campaign 10 we identify two eclipsing binaries containing white dwarfs with cool companions that have extremely short orbital peri…
Testing the white dwarf mass-radius relationship with eclipsing binaries
S. G. Parsons, B. T. Gänsicke, T. R. Marsh +17
We present high precision, model independent, mass and radius measurements for 16 white dwarfs in detached eclipsing binaries and combine these with previously published data to te…