ORCID Profile
0000-0002-1116-2553
Current Organisation
University of Southampton
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Publisher: Elsevier BV
Date: 11-2017
Publisher: Oxford University Press (OUP)
Date: 24-08-2016
Publisher: Oxford University Press (OUP)
Date: 22-06-2020
Abstract: We present the results of MeerKAT radio observations of 11 nearby nova-like cataclysmic variables (CVs). We have detected radio emission from IM Eri, RW Sex, V3885 Sgr, and V603 Aql. While RW Sex, V3885 Sgr, and V603 Aql had been previously detected, this is the first reported radio detection of IM Eri. Our observations have doubled the s le of non-magnetic CVs with sensitive radio data. We observe that at our radio detection limits, a specific optical luminosity ${\\gtrsim}2.2\\times 10^{18}\\,$ erg s−1 Hz−1 (corresponding to MV ≲ 6.0) is required to produce a radio detection. We also observe that the X-ray and radio luminosities of our detected nova-like CVs are on an extension of the $L_X\\propto L_R^{\\sim 0.7}$ power law originally proposed for non-pulsating neutron star low-mass X-ray binaries. We find no other correlations between the radio emission and emission in other wavebands or any other system parameters for the existing s le of radio-detected non-magnetic CVs. We measure in-band (0.9–1.7 GHz) radio spectral indices that are consistent with reports from earlier work. Finally, we constructed broad spectral energy distributions for our s le from published multiwavelength data, and use them to place constraints on the mass transfer rates of these systems.
Publisher: Oxford University Press (OUP)
Date: 05-02-2018
DOI: 10.1093/MNRAS/STY284
Publisher: Springer Science and Business Media LLC
Date: 11-09-2019
DOI: 10.1038/S41586-019-1556-X
Abstract: In the past two decades, high- litude electromagnetic outbursts have been detected from dormant galaxies and often attributed to the tidal disruption of a star by the central black hole
Publisher: Oxford University Press (OUP)
Date: 03-2009
Publisher: Oxford University Press (OUP)
Date: 24-05-2016
Publisher: Oxford University Press (OUP)
Date: 20-02-2021
Abstract: It was recently proposed that the cataclysmic variable (CV) LAMOST J024048.51+195226.9 may be a twin to the unique magnetic propeller system AE Aqr. If this is the case, two predictions are that it should display a short period white dwarf spin modulation, and that it should be a bright radio source. We obtained follow-up optical and radio observations of this CV, in order to see if this holds true. Our optical high-speed photometry does not reveal a white dwarf spin signal, but lacks the sensitivity to detect a modulation similar to the 33 s spin signal seen in AE Aqr. We detect the source in the radio, and measure a radio luminosity similar to that of AE Aqr and close to the highest so far reported for a CV. We also find good evidence for radio variability on a time-scale of tens of minutes. Optical polarimetric observations produce no detection of linear or circular polarization. While we are not able to provide compelling evidence, our observations are all consistent with this object being a propeller system.
Publisher: Oxford University Press (OUP)
Date: 11-03-2009
Publisher: Oxford University Press (OUP)
Date: 29-06-2015
Publisher: American Astronomical Society
Date: 14-10-2020
Publisher: Oxford University Press (OUP)
Date: 19-01-2016
Publisher: Oxford University Press (OUP)
Date: 02-03-2019
DOI: 10.1093/MNRAS/STZ614
Publisher: Oxford University Press (OUP)
Date: 14-09-2015
Publisher: Oxford University Press (OUP)
Date: 15-11-2013
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Christian Knigge.