We present a novel strategy to uncover the Galactic population of quiescent black holes (BHs). This is based on a new concept, the photometric mass function...
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PublicationHibernating black holes revealed by photometric mass functions
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PublicationHigh-speed photometry of Gaia14aae: an eclipsing AM CVn that challenges formation models
AM CVn-type systems are ultracompact, hydrogen-deficient accreting binaries with degenerate or semidegenerate donors. The evolutionary history of these systems...
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PublicationHS 0139+0559, HS 0229+8016, HS 0506+7725, and HS 0642+5049: four new long-period cataclysmic variables
We present time-resolved optical spectroscopy and photometry of four relatively bright (V˜14.0-15.5) long-period cataclysmic variables (CVs) discovered in the...
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PublicationHS 0943+1404, a true intermediate polar
We have identified a new intermediate polar, HS 0943+1404, as part of our ongoing search for cataclysmic variables in the Hamburg Quasar Survey. The orbital and...
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PublicationHubble Space Telescope and Ground-based Observations of V455 Andromedae Post-outburst
Hubble Space Telescope spectra obtained in 2010 and 2011, 3 and 4 yr after the large amplitude dwarf nova outburst of V455 And, were combined with optical...
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PublicationHunting for eclipses: high-speed observations of cataclysmic variables
We present new time-resolved photometry of 74 cataclysmic variables (CVs), 47 of which are eclipsing. Thirteen of these eclipsing systems are newly discovered...
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PublicationImaging the cool stars in the interacting binaries AE Aqr, BV Cen and V426 Oph
It is well known that magnetic activity in late-type stars increases with increasing rotation rate. Using inversion techniques akin to medical imaging, the...
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PublicationIPHAS J062746.41+014811.3: A Deeply Eclipsing Intermediate Polar
We present time-resolved photometry of a cataclysmic variable discovered in the Isaac Newton Telescope Photometric Hα Survey of the northern galactic plane...
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PublicationIrradiation of the secondary star in X-ray Nova Scorpii 1994 (=GRO J1655-40)
We have obtained intermediate resolution optical spectra of the black-hole candidate Nova Sco 1994 in June 1996, when the source was in an X-ray/optical active...