R. P. Fender
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View article: On the Distance to the Black Hole X-Ray Binary Swift J1727.8–1613
On the Distance to the Black Hole X-Ray Binary Swift J1727.8–1613 Open
We review the existing distance estimates to the black hole X-ray binary Swift J1727.8–1613, present new radio and near-UV spectra to update the distance constraints, and discuss the accuracies and caveats of the associated methodologies. …
View article: The Radio Flare and Multiwavelength Afterglow of the Short GRB 231117A: Energy Injection from a Violent Shell Collision
The Radio Flare and Multiwavelength Afterglow of the Short GRB 231117A: Energy Injection from a Violent Shell Collision Open
We present the early radio detection and multiwavelength modeling of the short gamma-ray burst (GRB) 231117A at redshift z = 0.257. The Australia Telescope Compact Array automatically triggered a 9 hr observation of GRB 231117A at 5.5 and …
View article: A MeerKAT view of the parsec-scale jets in the black-hole X-ray binary GRS 1758–258
A MeerKAT view of the parsec-scale jets in the black-hole X-ray binary GRS 1758–258 Open
Context. Jets from accreting black-hole (BH) X-ray binary (XRB) systems are powerful outflows that release a large fraction of the accretion energy to the surrounding environment, providing a feedback mechanism that may alter the propertie…
View article: New Metrics for Identifying Variables and Transients in Large Astronomical Surveys
New Metrics for Identifying Variables and Transients in Large Astronomical Surveys Open
A key science goal of large sky surveys such as those conducted by the Vera C. Rubin Observatory and precursors to the Square Kilometre Array is the identification of variable and transient objects. One approach is analyzing time series of…
View article: Gone with the Wind: JWST-MIRI Unveils a Strong Outflow from the Quiescent Stellar-mass Black Hole A0620-00
Gone with the Wind: JWST-MIRI Unveils a Strong Outflow from the Quiescent Stellar-mass Black Hole A0620-00 Open
We present new observations of the black hole X-ray binary A0620-00 using the Mid-Infrared (MIR) Instrument on the James Webb Space Telescope, during a state where the X-ray luminosity is 9 orders of magnitude below Eddington, and coordina…
View article: The connection between the fastest astrophysical jets and the spin axis of their black hole
The connection between the fastest astrophysical jets and the spin axis of their black hole Open
Astrophysical jets signpost the most extreme phenomena in the Universe. Despite a century of study, connections between the physics of black holes and the processes underpinning the formation and launch of these jets remain elusive. Here w…
View article: Relativistic precessing jets powered by an accreting neutron star
Relativistic precessing jets powered by an accreting neutron star Open
Precessing relativistic jets launched by compact objects are rarely directly measured, and present an invaluable opportunity to better understand many features of astrophysical jets. In this Letter we present MeerKAT radio observations of …
View article: XRISM reveals a variable, multi-phase outflow-inflow structure during the X-ray obscured 2024 outburst of the black hole transient V4641 Sgr
XRISM reveals a variable, multi-phase outflow-inflow structure during the X-ray obscured 2024 outburst of the black hole transient V4641 Sgr Open
We report the results of a simultaneous X-ray and optical spectroscopy campaign on the Galactic black hole X-ray binary V4641 Sgr, carried out with XRISM and the Seimei telescope during a low-luminosity phase towards the end of its 2024 ou…
View article: A Multi-wavelength Characterization of the 2023 Outburst of MAXI J1807+132: Manifestations of Disk Instability and Jet Emission
A Multi-wavelength Characterization of the 2023 Outburst of MAXI J1807+132: Manifestations of Disk Instability and Jet Emission Open
Several phenomenological aspects of low-luminosity neutron star transients, such as atolls, remain poorly understood. One such source, MAXI J1807+132, entered its latest outburst in 2023 July. To thoroughly characterize this outburst, we c…
View article: The accretion–ejection connection in the black hole X-ray binary MAXI J1820+070
The accretion–ejection connection in the black hole X-ray binary MAXI J1820+070 Open
The black hole X-ray binary MAXI J1820$+$070 began its first recorded outburst in March 2018, and remained an active radio, X-ray, and optical source for over 4 yr. Due to the low distance to the source and its intrinsically high luminosit…
View article: Joint Radiative and Kinematic Modelling of X-ray Binary Ejecta: Energy Estimate and Reverse Shock Detection
Joint Radiative and Kinematic Modelling of X-ray Binary Ejecta: Energy Estimate and Reverse Shock Detection Open
Black hole X-ray binaries in outburst launch discrete, large-scale jet ejections which can propagate to parsec scales. The kinematics of these ejecta appear to be well described by relativistic blast wave models original devised for gamma-…
View article: The Double Tidal Disruption Event AT 2022dbl Implies that at Least Some “Standard” Optical Tidal Disruption Events Are Partial Disruptions
The Double Tidal Disruption Event AT 2022dbl Implies that at Least Some “Standard” Optical Tidal Disruption Events Are Partial Disruptions Open
Flares produced following the tidal disruption of stars by supermassive black holes can reveal the properties of the otherwise dormant majority of black holes and the physics of accretion. In the past decade, a class of optical-ultraviolet…
View article: A Persistent Disk Wind and Variable Jet Outflow in the Neutron-star Low-mass X-Ray Binary GX 13+1
A Persistent Disk Wind and Variable Jet Outflow in the Neutron-star Low-mass X-Ray Binary GX 13+1 Open
In low-mass X-ray binaries (LMXBs), accretion flows are often associated with either jet outflows or disk winds. Studies of LMXBs with luminosities up to roughly 20% of the Eddington limit indicate that these outflows generally do not co-o…
View article: The Double Tidal Disruption Event AT 2022dbl Implies That at Least Some "Standard" Optical TDEs are Partial Disruptions
The Double Tidal Disruption Event AT 2022dbl Implies That at Least Some "Standard" Optical TDEs are Partial Disruptions Open
Flares produced following the tidal disruption of stars by supermassive black holes can reveal the properties of the otherwise dormant majority of black holes and the physics of accretion. In the past decade, a class of optical-ultraviolet…
View article: The Ejection of Transient Jets in Swift J1727.8−1613 Revealed by Time-dependent Visibility Modeling
The Ejection of Transient Jets in Swift J1727.8−1613 Revealed by Time-dependent Visibility Modeling Open
High angular resolution radio observations of relativistic jets are necessary to understand the causal connection between accretion and jet ejection in low-mass X-ray binaries. Images from these observations can be difficult to reconstruct…
View article: Blast waves and reverse shocks: from ultra-relativistic GRBs to moderately relativistic X-ray binaries
Blast waves and reverse shocks: from ultra-relativistic GRBs to moderately relativistic X-ray binaries Open
Blast wave models are commonly used to model relativistic outflows from ultra-relativistic gamma-ray bursts (GRBs), but are also applied to lower Lorentz factor ejections from X-ray binaries (XRBs). Here, we revisit the physics of blast wa…
View article: A persistent disk wind and variable jet outflow in the neutron-star low-mass X-ray binary GX 13+1
A persistent disk wind and variable jet outflow in the neutron-star low-mass X-ray binary GX 13+1 Open
In low-mass X-ray binaries (LMXBs), accretion flows are often associated with either jet outflows or disk winds. Studies of LMXBs with luminosities up to roughly 20% of the Eddington limit indicate that these outflows generally do not co-o…
View article: Quantifying jet–interstellar medium interactions in Cyg X-1: Insights from dual-frequency bow shock detection with MeerKAT
Quantifying jet–interstellar medium interactions in Cyg X-1: Insights from dual-frequency bow shock detection with MeerKAT Open
Context. Accretion and outflows are astrophysical phenomena observed across a wide range of objects, from white dwarfs to supermassive black holes. Developing a complete picture of these processes requires complementary studies across this…
View article: MeerKAT discovers a jet-driven bow shock near GRS 1915+105
MeerKAT discovers a jet-driven bow shock near GRS 1915+105 Open
Context. Black holes, both supermassive and stellar-mass, impact the evolution of their surroundings on a large range of scales. While the role of supermassive black holes is well studied, the effects of stellar-mass black holes on their s…
View article: Sub-second optical/near-infrared quasi-periodic oscillations from the black hole X-ray transient Swift J1727.8-1613
Sub-second optical/near-infrared quasi-periodic oscillations from the black hole X-ray transient Swift J1727.8-1613 Open
We report on the detection of optical/near-infrared (O-IR) quasi-periodic oscillations (QPOs) from the black hole X-ray transient Swift J1727.8-1613. We obtained three X-ray and O-IR high-time-resolution observations of the source during i…
View article: Blast waves and reverse shocks: from ultra-relativistic GRBs to moderately relativistic X-ray binaries
Blast waves and reverse shocks: from ultra-relativistic GRBs to moderately relativistic X-ray binaries Open
Blast wave models are commonly used to model relativistic outflows from ultra-relativistic gamma-ray bursts (GRBs), but are also applied to lower Lorentz factor ejections from X-ray binaries (XRBs). Here we revisit the physics of blast wav…
View article: Multiwavelength analysis of AT 2023sva: a luminous orphan afterglow with evidence for a structured jet
Multiwavelength analysis of AT 2023sva: a luminous orphan afterglow with evidence for a structured jet Open
We present multiwavelength analysis of ZTF23abelseb (AT 2023sva), an optically discovered fast-fading ($\Delta m_r = 2.2$ mag in $\Delta t = 0.74$ d), luminous ($M_r \sim -30.0$ mag), and red ($g-r = 0.50$ mag) transient at $z = 2.28$ with…
View article: Contemporaneous optical-radio observations of a fast radio burst in a close galaxy pair
Contemporaneous optical-radio observations of a fast radio burst in a close galaxy pair Open
We present the MeerKAT discovery and MeerLICHT contemporaneous optical observations of the fast radio burst (FRB) 20230808F, which was found to have a dispersion measure of $\mathrm{DM}=653.2\pm 0.4\mathrm{\, pc\, cm^{-3}}$. FRB 20230808F …
View article: Type I X-ray Burst Emission Reflected into the Eclipses of EXO 0748-676
Type I X-ray Burst Emission Reflected into the Eclipses of EXO 0748-676 Open
The neutron star X-ray binary, EXO 0748--676, was observed regularly by the Rossi X-ray Timing Explorer (RXTE) and XMM-Newton during its first detected outburst (1985 - 2008). These observations captured hundreds of asymmetric, energy-depe…
View article: State-dependent signatures of jets and winds in the optical and infrared spectrum of the black hole transient GX 339$-$4
State-dependent signatures of jets and winds in the optical and infrared spectrum of the black hole transient GX 339$-$4 Open
GX 339$-$4 is one of the prototypical black hole X-ray transients, exhibiting recurrent outbursts that allow detailed studies of black hole accretion and ejection phenomena. In this work we present four epochs of optical and near-infrared …
View article: Rapid Mid-Infrared Spectral-Timing with <i>JWST</i>: I. GRS 1915+105 during a MIR–bright and X-ray–obscured state
Rapid Mid-Infrared Spectral-Timing with <i>JWST</i>: I. GRS 1915+105 during a MIR–bright and X-ray–obscured state Open
We present mid-infrared (MIR) spectral-timing measurements of the prototypical Galactic microquasar GRS 1915+105. The source was observed with the Mid-Infrared Instrument (MIRI) onboard JWST in June 2023 at a MIR luminosity LMIR ≈ 1036 erg…
View article: Late-time supernovae radio re-brightening in the VAST pilot survey
Late-time supernovae radio re-brightening in the VAST pilot survey Open
We present our analysis of supernovae serendipitously found to be radio-bright several years after their optical discovery. We used recent observations from the Australian SKA Pathfinder (ASKAP) taken as part of the pilot Variables and Slo…
View article: Late-Time Supernovae Radio Re-brightening in the VAST Pilot Survey
Late-Time Supernovae Radio Re-brightening in the VAST Pilot Survey Open
We present our analysis of supernovae serendipitously found to be radio-bright several years after their optical discovery. We used recent observations from the Australian SKA Pathfinder taken as part of the pilot Variables and Slow Transi…
View article: Rocking the BOAT: the ups and downs of the long-term radio light curve for GRB 221009A
Rocking the BOAT: the ups and downs of the long-term radio light curve for GRB 221009A Open
We present radio observations of the long-duration gamma-ray burst (GRB) 221009A that has become known to the community as the Brightest Of All Time or the BOAT. Our observations span the first 475 d post-burst and three orders of magnitud…
View article: Radio observations of the 2022 outburst of the transitional Z-Atoll source XTE J1701−462
Radio observations of the 2022 outburst of the transitional Z-Atoll source XTE J1701−462 Open
XTE J1701−462 is a neutron star low-mass X-ray binary (NS LMXB) discovered in 2006 as the first system to demonstrate unambiguously that the ‘Atoll’ and ‘Z’ classes of accreting neutron stars are separated by accretion rate. Radio observat…