We present high-speed, multi-colour optical photometry of the anomalous X-ray pulsar 4U0142+61, obtained with ULTRACAM on the 4.2-m William Herschel Telescope. We detect 4U0142+61 at magnitudes of i = 23.7± 0.1, g = 27.2± 0.2 and u > 25.8, consistent with the magnitudes found by Hulleman et al. (2004) and hence confirming their discovery of both a spectral break in the optical and a lack of lon...

We report X-ray observations of the newly discovered pulsating white dwarf eRASSU J191213.9-441044 with Spectrum Roentgen Gamma and eROSITA (SRG/eROSITA) XMM-Newton. The new source was during first all-sky survey at a flux level fX (0.2 - 2.3 keV) = 3.3 e-13 erg cm-2 s-1 found to be spatially coincident G 17.1 stellar Gaia-source distance 237 pc. dropped about 1 three following surveys remained...

We present a novel approach for a rigorous bundle adjustment for omnidirectional and multi-view cameras, which enables an efficient maximum-likelihood estimation with image and scene points at infinity. Multi-camera systems are used to increase the resolution, to combine cameras with different spectral sensitivities (Z/I DMC, Vexcel Ultracam) or – like omnidirectional cameras – to augment the e...

We have measured the transmission spectrum of the extremely inflated hot Jupiter WASP-52b using simultaneous photometric observations in Sloan Digital Sky Survey u′, g′ and a filter centred on the sodium doublet (Na I) with the ULTRACAM instrument mounted on the 4.2-m William Herschel Telescope. We find that Rayleigh scattering is not the dominant source of opacity within the planetary atmosphe...

We report the discovery and analysis of PTF1 J085713+331843, a new eclipsing post common-envelope detached white-dwarf red-dwarf binary with a 2.5h orbital period discovered by the Palomar Transient Factory. ULTRACAM multicolour photometry over multiple orbital periods reveals a light curve with a deep flat-bottomed primary eclipse and a strong reflection effect. Phase-resolved spectroscopy sho...

With orbital periods of the order of tens of minutes or less, the AM Canum Venaticorum stars are ultracompact, hydrogen-deficient binaries with the shortest periods of any binary subclass, and are expected to be among the strongest gravitational wave sources in the sky. To date, the only known eclipsing source of this type is the P = 28 min binary SDSS J0926+3624. We present multiband, high tim...

We have conducted an extensive observational campaign of SWIFT J1753.5−0127 during June 2007 after its bright outburst episode in 2005. We have performed multi-band optical photometry, optical spectroscopy, X-ray spectroscopy and timing and ULTRACAM optical photometry simultaneously in three bands. Both the optical spectrum and the X-ray spectrum, along with enhanced brightness in broad-band ph...

ABSTRACT This article reports quasi-continuous transiting events towards WD 1054–226 at d = 36.2 pc and V 16.0 mag, based on simultaneous, high-cadence, multiwavelength imaging photometry using ULTRACAM over 18 nights from 2019 to 2020 March. The predominant period is 25.02 h corresponds a circular orbit with blackbody Teq 323 K, where planetary surface can nominally support liquid water. light...

this study is a contribution to assess the high resolution digital aerial imagery for semi-automatic analysis of tree species identification. to maximize the benefit of such data, the object-based classification was conducted in a mixed forest plantation. two subsets of an ultracam d image were geometrically corrected using aero-triangulation method. some appropriate transformations were perfor...