14 citations · 28 across the 17 of their papers we have counts for
17 papers
The Long-Period Radio Transient and Cataclysmic Variable ASKAP J1745-5051: Evidence for a 15,000 K White Dwarf and a Sub-Stellar Donor
Christian Knigge, Simone Scaringi, Noel Castro Segura +2
Long-period transients (LPTs) are radio sources that exhibit polarized periodic radio bursts on time-scales of minutes to hours. At least some LPTs are associated with white dwarfs…
Radiation-ionization hydrodynamic simulations of AGN line-driven winds lead to transient shielding and BAL/UFO signatures
Nicolas Scepi, Christian Knigge, Amin Mosallanezhad +4
Disc winds from active galactic nuclei (AGN) can be launched by radiation pressure acting on spectral lines. However, launching a line-driven wind in the X-ray rich environment of…
The Inner and Outer Shock Layers of Bow Shocks in Cataclysmic Variables
Krystian Ilkiewicz, Christian Knigge, Simone Scaringi +3
Bow shocks around cataclysmic variables (CVs) have traditionally been identified with a single bright optical arc. This feature has been interpreted as the bow shock formed by the…
Accreting White Dwarfs: An Unreview
Simone Scaringi, Christian Knigge, Domitilla de Martino
Accreting white dwarfs (AWDs) are among the best natural laboratories for understanding disk accretion. Their proximity, brightness, and purely classical nature make them ideal sys…
A persistent bow shock in a diskless magnetised accreting white dwarf
Krystian Ilkiewicz, Simone Scaringi, Domitilla de Martino +9
Stellar bow shocks are formed when an outflow interacts with the interstellar medium. In white dwarfs accreting from a binary companion, outflows are associated with either strong…
A comprehensive search for high-velocity X-ray sources: New compact object binary candidates in the Gaia era
Yue Zhao, Poshak Gandhi, Christian Knigge +6
We perform a comprehensive search for high-velocity X-ray sources with large X-ray/optical flux ratios (), identifying candidates for interacting black h…
The critical role of clumping in line-driven disc winds
Amin Mosallanezhad, Christian Knigge, Nicolas Scepi +4
Radiation pressure on spectral lines is a promising mechanism for powering disc winds from accreting white dwarfs (AWDs) and active galactic nuclei (AGN). However, in radiation-hyd…
Further evidence for natal kick segregation by spectral type in high-mass X-ray binaries
Pornisara Nuchvanichakul, Poshak Gandhi, Christian Knigge +4
High-mass X-ray binaries (HMXBs) are systems in which a neutron star or black hole accretes material from a massive companion. HMXBs are expected to have experienced a supernova in…
A Diagnostic Kit for Optical Emission Lines Shaped by Accretion Disc Winds
Austen G. W. Wallis, Christian Knigge, James H. Matthews +2
Blueshifted absorption is the classic spectroscopic signature of an accretion disc wind in X-ray binaries and cataclysmic variables (CVs). However, outflows can also create pure em…
Evolution of the inner accretion flow and the white-dwarf spin pulse during the 2023 outburst in GK Persei
Mariko Kimura, Takayuki Hayashi, Yuuki Wada +8
We present our X-ray and optical observations performed by NICER, NuSTAR, and Tomo-e Gozen during the 2023 outburst in the intermediate polar GK Persei. The X-ray spectrum consiste…
On the distance to the black hole X-ray binary Swift J1727.81613
Benjamin J. Burridge, James C. A. Miller-Jones, Arash Bahramian +11
We review the existing distance estimates to the black hole X-ray binary Swift J1727.81613, present new radio and near-UV spectra to update the distance constraints, and discuss…
Ultraviolet spectroscopy of the black hole X-ray binary MAXI J1820+070 across a state transition
Maria Georganti, Christian Knigge, Noel Castro Segura +8
We present ultraviolet (UV) spectroscopic observations covering three distinct accretion states of the low-mass X-ray binary (LMXB) MAXI J1820+070: the luminous hard state, a hard-…
Characterisation of H spectra from EXO 051910+3737.7 X-rays binaries
Pornisara Nuchvanichakul, Puji Irawati, Pakakaew Rittipruk +4
We investigate the spectral characteristics of the Be/X-ray binary system, EXO 051910+3737.7, in which Be/X-ray systems are the largest sub-class of high-mass X-ray binaries. Spect…
SIROCCO: A Publicly Available Monte Carlo Ionization and Radiative Transfer Code for Astrophysical Outflows
James H. Matthews, Knox S. Long, Christian Knigge +8
Outflows are critical components of many astrophysical systems, including accreting compact binaries and active galactic nuclei (AGN). These outflows can significantly affect a sys…
A multi-dimensional view of a unified model for TDEs
Edward J. Parkinson, Christian Knigge, Lixin Dai +3
Tidal disruption events (TDEs) can generate non-spherical, relativistic and optically thick outflows. Simulations show that the radiation we observe is reprocessed by these outflow…
A disc wind origin for the optical spectra of dwarf novae in outburst
Yusuke Tampo, Christian Knigge, Knox S. Long +2
Many high-state cataclysmic variables (CVs) exhibit blue-shifted absorption features in their ultraviolet (UV) spectra -- a smoking-gun signature of outflows. However, the impact o…
New Compact Object Binary Populations with Precision Astrometry (Roman White Paper)
P. Gandhi, C. Dashwood Brown, Y. Zhao +6
Compact object binaries (a black hole or a neutron star orbiting a non-degenerate stellar companion) are key to our understanding of late massive star evolution, in addition to bei…