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A Black Hole X-ray Binary at 100 Hz: Multiwavelength Timing of MAXI J1820+070 with HiPERCAM and NICER
J. A. Paice, P. Gandhi, T. Shahbaz +12
We report on simultaneous sub-second optical and X-ray timing observations of the low mass X-ray binary black hole candidate MAXI J1820+070. The bright 2018 outburst rise allowed s…
Doppler tomography as a tool for detecting exoplanet atmospheres
Christopher Watson, Ernst de Mooij, Danny Steeghs +4
High-resolution Doppler spectroscopy is a powerful tool for identifying molecular species in the atmospheres of both transiting and non-transiting exoplanets. Currently, such data…
Core crystallization and pile-up in the cooling sequence of evolving white dwarfs
Pier-Emmanuel Tremblay, Gilles Fontaine, Nicola Pietro Gentile Fusillo +7
White dwarfs are stellar embers depleted of nuclear energy sources that cool over billions of years. These stars, which are supported by electron degeneracy pressure, reach densiti…
The EREBOS project -- Investigating the effect of substellar and low-mass stellar companions on late stellar evolution
V. Schaffenroth, B. N. Barlow, S. Geier +14
Eclipsing post-common envelope binaries are highly important for resolving the poorly understood, very short-lived common envelope phase. Most hot subdwarfs (sdO/Bs) are the bare H…
Short period variable stars in young open cluster Stock 8
Sneh Lata, Anil. K. Pandey, Ram Kesh Yadav +5
We present time series photometry in the field of Stock 8 and identified 130 short period variable stars. Twenty eight main-sequence and 23 pre-main-sequence variables are found to…
Optical and X-ray Correlations During the 2015 Outburst of the Black Hole V404 Cyg
R. I. Hynes, E. L. Robinson, D. M. Terndrup +5
We present a serendipitous multiwavelength campaign of optical photometry simultaneous with Integral X-ray monitoring of the 2015 outburst of the black hole V404 Cyg. Large amplitu…
A planetesimal orbiting within the debris disc around a white dwarf star
Christopher J. Manser, Boris T. Gänsicke, Siegfried Eggl +29
Many white dwarf stars show signs of having accreted smaller bodies, implying that they may host planetary systems. A small number of these systems contain gaseous debris discs, vi…
The evolutionary status of Cataclysmic Variables: Eclipse modelling of 15 systems
M. McAllister, S. P. Littlefair, S. G. Parsons +13
We present measurements of the component masses in 15 Cataclysmic Variables (CVs) - 6 new estimates and 9 improved estimates. We provide new calibrations of the relationship betwee…
Astro2020 Science White Paper: Understanding the evolution of close white dwarf binaries
Odette Toloza, Elme Breed, Domitilla De Martino +27
Interacting binaries containing white dwarfs can lead to a variety of outcomes that range from powerful thermonuclear explosions, which are important in the chemical evolution of g…
Multimessenger science opportunities with mHz gravitational waves
John Baker, Zoltán Haiman, Elena Maria Rossi +32
LISA will open the mHz band of gravitational waves (GWs) to the astronomy community. The strong gravity which powers the variety of GW sources in this band is also crucial in a num…
Accurate mass and radius determinations of a cool subdwarf in an eclipsing binary
Alberto Rebassa-Mansergas, Steven G. Parsons, Vikram S. Dhillon +4
Cool subdwarfs are metal-poor low-mass stars that formed during the early stages of the evolution of our Galaxy. Because they are relatively rare in the vicinity of the Sun, we kno…
Pluto's lower atmosphere and pressure evolution from ground-based stellar occultations, 1988-2016
E. Meza, B. Sicardy, M. Assafin +167
Context. Pluto's tenuous nitrogen (N2) atmosphere undergoes strong seasonal effects due to high obliquity and orbital eccentricity, and has been recently (July 2015) observed by th…
Phase-Resolved Spectroscopy of Gaia14aae: Line Emission From Near the White Dwarf Surface
M. J. Green, T. R. Marsh, D. Steeghs +8
AM CVn binaries are a class of ultracompact, hydrogen-deficient binaries, each consisting of a white dwarf accreting helium-dominated material from a degenerate or semi-degenerate…
Evidence for bimodal orbital separations of white dwarf-red dwarf binary stars
R. P. Ashley, J. Farihi, T. R. Marsh +2
We present the results of a radial velocity survey of 20 white dwarf plus M dwarf binaries selected as a follow up to a \textit{Hubble Space Telescope} study that aimed to spatiall…