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System mass constraints for the accreting millisecond pulsar XTE J1814-338 using Bowen fluorescence
L. Wang, D. Steeghs, J. Casares +5
We present phase-resolved spectroscopy of the millisecond X-ray pulsar XTE J1814-338 obtained during its 2003 outburst. The spectra are dominated by high-excitation emission lines…
Hunting For Eclipses: High Speed Observations of Cataclysmic Variables
Liam K Hardy, Martin J McAllister, Vik S Dhillon +12
We present new time-resolved photometry of 74 cataclysmic variables (CVs), 47 of which are eclipsing. 13 of these eclipsing systems are newly discovered. For all 47 eclipsing syste…
The Gaia DR1 Mass-Radius Relation for White Dwarfs
P. -E. Tremblay, N. Gentile-Fusillo, R. Raddi +8
The Gaia Data Release 1 (DR1) sample of white dwarf parallaxes is presented, including 6 directly observed degenerates and 46 white dwarfs in wide binaries. This data set is combin…
Using Gaussian processes to model light curves in the presence of flickering: the eclipsing cataclysmic variable ASASSN-14ag
M. J. McAllister, S. P. Littlefair, V. S. Dhillon +10
The majority of cataclysmic variable (CV) stars contain a stochastic noise component in their light curves, commonly referred to as flickering. This can significantly affect the mo…
Transmission spectroscopy of the inflated exoplanet WASP-52b, and evidence for a bright region on the stellar surface
J. Kirk, P. J. Wheatley, T. Louden +5
We have measured the transmission spectrum of the extremely inflated hot Jupiter WASP-52b using simultaneous photometric observations in SDSS u', g' and a filter centred on the sod…
Broad-band spectrophotometry of HAT-P-32 b: Search for a scattering signature in the planetary spectrum
M. Mallonn, I. Bernt, E. Herrero +12
Multi-colour broad-band transit observations offer the opportunity to characterise the atmosphere of an extrasolar planet with small- to medium-sized telescopes. One of the most fa…
HiPERCAM: A high-speed, quintuple-beam CCD camera for the study of rapid variability in the Universe
V. S. Dhillon, T. R. Marsh, N. Bezawada +10
HiPERCAM is a high-speed camera for the study of rapid variability in the Universe. The project is funded by a 3.5MEuro European Research Council Advanced Grant. HiPERCAM builds on…
Long-term eclipse timing of white dwarf binaries: an observational hint of a magnetic mechanism at work
M. C. P. Bours, T. R. Marsh, S. G. Parsons +18
We present a long-term programme for timing the eclipses of white dwarfs in close binaries to measure apparent and/or real variations in their orbital periods. Our programme includ…
Transit timing variation and transmission spectroscopy analyses of the hot Neptune GJ3470b
S. Awiphan, E. Kerins, S. Pichadee +8
GJ3470b is a hot Neptune exoplanet orbiting an M dwarf and the first sub-Jovian planet to exhibit Rayleigh scattering. We present transit timing variation (TTV) and transmission sp…
An irradiated brown-dwarf companion to an accreting white dwarf
Juan V. Hernández Santisteban, Christian Knigge, Stuart P. Littlefair +7
Brown dwarfs and giant planets orbiting close to a host star are subjected to significant irradiation that can modify the properties of their atmospheres. In order to test the atmo…
The Detection of Dust around NN Ser
Adam Hardy, Matthias R. Schreiber, Steven G. Parsons +6
Eclipse timing variations observed from the post common-envelope binary (PCEB) NN Ser offer strong evidence in favour of circumbinary planets existing around PCEBs. If real, these…
Precision Ephemerides For Gravitational Wave Searches: II. Cyg X-2
Sammanani S. Premachandra, Duncan K. Galloway, Jorge Casares +2
Accreting neutron stars in low-mass X-ray binaries (LMXBs) are candidate high-frequency persistent gravitational wave sources. These may be detectable with next generation interfer…
GW Librae: A unique laboratory for pulsations in an accreting white dwarf
O. Toloza, B. T. Gaensicke, J. J. Hermes +22
Non-radial pulsations have been identified in a number of accreting white dwarfs in cataclysmic variables. These stars offer insight into the excitation of pulsation modes in atmos…
Kepler K2 Observations of the Intermediate Polar FO Aquarii
M. R. Kennedy, P. Garnavich, E. Breedt +5
We present photometry of the intermediate polar FO Aquarii obtained as part of the K2 mission using the Kepler space telescope. The amplitude spectrum of the data confirms the orbi…
Pulsating hot O subdwarfs in Omega Cen: mapping a unique instability strip on the Extreme Horizontal Branch
S. K. Randall, A. Calamida, G. Fontaine +10
We present an extensive survey for rapid pulsators among Extreme Horizontal Branch (EHB) stars in omega Cen. The observations performed consist of nearly 100 hours of time-series p…
M Dwarf Flare Continuum Variations on One-Second Timescales: Calibrating and Modeling of ULTRACAM Flare Color Indices
Adam F. Kowalski, Mihalis Mathioudakis, Suzanne L. Hawley +5
We present a large dataset of high cadence dMe flare light curves obtained with custom continuum filters on the triple-beam, high-speed camera system ULTRACAM. The measurements pro…
UVES and X-Shooter spectroscopy of the emission line AM CVn systems GP Com and V396 Hya
T. Kupfer, D. Steeghs, P. J. Groot +3
We present time-resolved spectroscopy of the AM CVn-type binaries GP Com and V396 Hya obtained with VLT/X-Shooter and VLT/UVES. We fully resolve the narrow central components of th…