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Remarkable spectral variability on the spin period of the accreting white dwarf in V455 And
S. Bloemen, D. Steeghs, K. De Smedt +4
We present spin-resolved spectroscopy of the accreting white dwarf binary V455 And. With a suggested spin period of only 67s, it has one of the fastest spinning white dwarfs known.…
NLTT5306: The shortest Period Detached White Dwarf + Brown Dwarf Binary
P. R. Steele, R. P. Saglia, M. R. Burleigh +6
We have spectroscopically confirmed a brown dwarf mass companion to the hydrogen atmosphere white dwarf NLTT5306. The white dwarf's atmospheric parameters were measured using Sloan…
A search for the hidden population of AM CVn binaries in the Sloan Digital Sky Survey
P. J. Carter, T. R. Marsh, D. Steeghs +7
We present the latest results from a spectroscopic survey designed to uncover the hidden population of AM Canum Venaticorum (AM CVn) binaries in the photometric database of the Slo…
Eclipsing Post Common Envelope Binaries from the Catalina Surveys
S. G. Parsons, B. T. Gänsicke, T. R. Marsh +6
We analyse the Catalina Real-time Transient Survey light curves of 835 spectroscopically confirmed white dwarf plus main-sequence binaries from the Sloan Digital Sky Survey (SDSS)…
The SW Sex enigma
V. S. Dhillon, D. A. Smith, T. R. Marsh
The SW Sex stars are a class of cataclysmic variables, originally identified because they shared a number of enigmatic properties - most notably, single-peaked emission lines inste…
Discovery of the closest hot subdwarf binary with white dwarf companion
S. Geier, T. R. Marsh, B. H. Dunlap +13
We report the discovery of an extremely close, eclipsing binary system. A white dwarf is orbited by a core He-burning compact hot subdwarf star with a period as short as $\simeq0.0…
Common Envelope Evolution: Where we stand and how we can move forward
N. Ivanova, S. Justham, X. Chen +16
This work aims to present our current best physical understanding of common-envelope evolution (CEE). We highlight areas of consensus and disagreement, and stress ideas which shoul…
An accurate mass and radius measurement for an ultracool white dwarf
S. G. Parsons, B. T. Gänsicke, T. R. Marsh +6
Studies of cool white dwarfs in the solar neighbourhood have placed a limit on the age of the Galactic disk of 8-9 billion years. However, determining their cooling ages requires t…
MUCHFUSS - Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS
S. Geier, V. Schaffenroth, H. Hirsch +15
The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact companions (white dwarfs with ma…
z'-band Ground-Based Detection of the Secondary Eclipse of WASP-19b
J. R. Burton, C. A. Watson, S. P. Littlefair +4
We present the ground-based detection of the secondary eclipse of the transiting exoplanet WASP-19b. The observations were made in the Sloan z'-band using the ULTRACAM triple-beam…
Mass ratio from Doppler beaming and Rømer delay versus ellipsoidal modulation in the Kepler data of KOI-74
S. Bloemen, T. R. Marsh, P. Degroote +18
We present a light curve analysis and radial velocity study of KOI-74, an eclipsing A star + white dwarf binary with a 5.2 day orbit. Aside from new spectroscopy covering the orbit…
Constraints on the Lifetimes of Disks Resulting from Tidally Destroyed Rocky Planetary Bodies
J. Girven, C. S. Brinkworth, J. Farihi +4
Spitzer IRAC observations of 15 metal-polluted white dwarfs reveal infrared excesses in the spectral energy distributions of HE 0110-5630, GD 61, and HE 1349-2305. All three of the…
Discovery of a stripped red giant core in a bright eclipsing binary star
P. F. L. Maxted, D. R. Anderson, M. R. Burleigh +12
We report the serendipitous discovery from WASP archive photometry of a binary star in which an apparently normal A-type star (J0247-25A) eclipses a smaller, hotter subdwarf star (…
HS 2325+8205 - an ideal laboratory for accretion disk physics
S. Pyrzas, B. T. Gaensicke, J. R. Thorstensen +12
We identify HS 2325+8205 as an eclipsing, frequently outbursting dwarf nova with an orbital period of 279.841731(5) min. Spectroscopic observations are used to derive the radial ve…