P. Jonker

Publications638
h-index52
Citations16,407
Highly Influential Citations1,096
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Gaia Data Release 2
Context. We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter…
The distances to Galactic low-mass X-ray binaries: consequences for black hole luminosities and kicks
We investigated the reported distances of Galactic black hole (BH) and neutron star low-mass X-ray binaries (LMXBs). Comparing the distances derived for the neutron stars Cyg X-2 and XTE J2123-058…
THE FIRST ACCURATE PARALLAX DISTANCE TO A BLACK HOLE
Using astrometric VLBI observations, we have determined the parallax of the black hole X-ray binary V404 Cyg to be 0.418 ± 0.024 mas, corresponding to a distance of 2.39 ± 0.14 kpc, significantly…
Six new candidate ultracompact X-ray binaries
Ultracompact X-ray binaries (UCXBs) appear able to sustain accretion onto the compact accretor at rates lower than in wider X-ray binaries. This may be understood by the smaller accretion disks in…
A kilonova as the electromagnetic counterpart to a gravitational-wave source
TLDR
Observations and physical modelling of a rapidly fading electromagnetic transient in the galaxy NGC 4993, which is spatially coincident with GW170817, indicate that neutron-star mergers produce gravitational waves and radioactively powered kilonovae, and are a nucleosynthetic source of the r-process elements.
A radio-pulsing white dwarf binary star
TLDR
The discovery is reported of a white dwarf/cool star binary that emits from X-ray to radio wavelengths and the spin-down power is an order of magnitude larger than that seen in electromagnetic radiation, which suggests that AR Sco is primarily spin-powered.
A radio-emitting outflow in the quiescent state of A0620−00: implications for modelling low-luminosity black hole binaries
Deep observations with the Very Large Array of A0620-00, performed in 2005 August, resulted in the first detection of radio emission from a black hole binary at X-ray luminosities as low as 10-8.5…
Optical and X-ray observations of the neutron star soft X-ray transient XTE J1709–267
In this paper we report on the discovery of the optical counterpart to the neutron star soft X-ray transient (SXT) XTE J1709-267 at an R-band magnitude of R = 20.5 ± 0.1 and 22.24 ± 0.03, in outburst…
Localization and broadband follow-up of the gravitational-wave transient GW150914
A gravitational-wave (GW) transient was identified in data recorded by the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO) detectors on 2015 September 14. The event, initially…
A study of the Type II-P supernova 2003gd in M74
We present photometric and spectroscopic data of the Type II-P supernova (SN II-P) 2003gd, which was discovered in M74 close to the end of its plateau phase. SN 2003gd is the first Type II supernova…
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