Astrophysical: Accretion

  • Publication
    A high-resolution X-ray view of the ultra-fast outflow in MAXI J1810−222
    Context. The Galactic black hole candidate MAXI J1810−222 was recently reported to exhibit a notable absorption spectral feature at around 1 keV in low...
  • Publication
    A Hα metric for identifying dormant black holes in X-ray transients
    Dormant black holes in X-ray transients can be identified by the presence of broad Hα emission lines from quiescent accretion discs. Unfortunately, short-period...
  • Publication
    A late jet rebrightening revealed from multiwavelength monitoring of the black hole candidate XTE J1752-223
    We present optical monitoring of the black hole candidate XTE J1752-223 during its 2009-10 outburst and decay to quiescence. The optical light curve can be...
  • Publication
    A Link Between White Dwarf Pulsars and Polars: Multiwavelength Observations of the 9.36-minute Period Variable Gaia22ayj
    White dwarfs (WDs) are the most abundant compact objects, and recent surveys have suggested that over a third of WDs in accreting binaries host a strong (B ≳ 1...
  • Publication
    A long-term modulation in XTEJ1716-389: an SS433-like system
    We report on the properties of a 99.3-d periodic modulation in the X-ray transient XTEJ1716-389. We associate this source with the transient KSJ1716-389, first...
  • Publication
    A long-term optical-X-ray correlation in 4U 1957+11
    Three years of optical monitoring of the low-mass X-ray binary (LMXB) 4U 1957+11 is presented. The source was observed in V, R and i bands using the Faulkes...
  • Publication
    A long-term X-ray monitoring of the ultraluminous X-ray source NGC 5408 X-1 with Swift reveals the presence of dips but no orbital period
    NGC 5408 X-1 is a well-studied ultraluminous X-ray source (ULX) that has been seen to emit in X-rays persistently above the Eddington limit of a stellar mass...
  • Publication
    A lower limit to the accretion disc radius in the low-luminosity AGNNGC 1052 derived from high-angular resolution data
    We investigate the central sub-arcsec region of the low-luminosity active galactic nucleusNGC 1052, using a high-angular resolution data set that covers 10...
  • Publication
    A mid-infrared study of very low mass stars and brown dwarfs in Upper Scorpius
    Context: To investigate the formation of sub-stellar objects, we observed a sample of ultracool dwarf members of the Upper Scorpius OB association. Aims: The...