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Properties of the Eclipsing Double-White Dwarf Binary NLTT 11748
David L. Kaplan, Thomas R. Marsh, Arielle N. Walker +9
We present high-quality ULTRACAM photometry of the eclipsing detached double-white dwarf binary NLTT 11748. This system consists of a carbon/oxygen white dwarf and an extremely-low…
Optical transmission photometry of the highly inflated exoplanet WASP-17b
J. Bento, P. J. Wheatley, C. M. Copperwheat +7
We present ground-based high-precision observations of the transit of WASP-17b using the multi-band photometer ULTRACAM on ESO's NTT in the context of performing transmission spect…
The AM CVn binary SDSS J173047.59+554518.5
P. J. Carter, D. Steeghs, T. R. Marsh +4
The AM Canum Venaticorum (AM CVn) binaries are a rare group of hydrogen-deficient, ultra-short period, mass-transferring white dwarf binaries, and are possible progenitors of type…
The planets around NN Ser: still there
T. R. Marsh, S. G. Parsons, M. C. P. Bours +6
We present 25 new eclipse times of the white dwarf binary NN Ser taken with the high-speed camera ULTRACAM on the WHT and NTT, the RISE camera on the Liverpool Telescope, and HAWK-…
ULTRACAM z'-band Detection of the Secondary Eclipse of WASP-12b
D. Föhring, V. S. Dhillon, Nikku Madhusudhan +4
We present z'-band secondary eclipse photometry of the highly irradiated hot Jupiter WASP-12b using ULTRACAM on the 4.2m William Herschel Telescope. We measure a decrease in flux o…
Hot subdwarf stars in close-up view IV. Helium abundances and the He isotopic anomaly of subdwarf B star
S. Geier, U. Heber, H. Edelmann +5
Atmospheric parameters and helium abundances of 44 bright subdwarf B stars have been determined. More than half of our sample consists of newly discovered stars from the Edinburgh…