Publications (31)
A multi-wavelength study of the hard and soft states of MAXI J1820+070 during its 2018 outburst
Srimanta Banerjee, Gulab C. Dewangan, Christian Knigge +8
We present a comprehensive multi-wavelength spectral analysis of the black hole X-ray binary MAXI J1820+070 during its 2018 outburst, utilizing AstroSat far UV, soft and hard X-ray…
Polarized synchrotron emission in quiescent black hole X-ray transients
David M. Russell, Tariq Shahbaz, Fraser Lewis +1
We present near-infrared polarimetric observations of the black hole X-ray binaries Swift J1357.2-0933 and A0620-00. In both sources, recent studies have demonstrated the presence…
Quiescent X-Ray/Optical Counterparts of the Black Hole Transient H 1705-250
Yi-Jung Yang, Albert K. H. Kong, David M. Russell +2
We report the result of a new Chandra observation of the black hole X-ray transient H 1705-250 in quiescence. H 1705-250 was barely detected in the new 50 ks Chandra observation. W…
HERschel Observations of Edge-on Spirals (HEROES). IV. Dust energy balance problem
Aleksandr V. Mosenkov, Flor Allaert, Maarten Baes +15
We present results of the detailed dust energy balance study for the seven large edge-on galaxies in the HEROES sample using 3D radiative transfer (RT) modelling. Based on availabl…
HERschel Observations of Edge-on Spirals (HEROES). III. Dust energy balance study of IC 2531
Aleksandr V. Mosenkov, Flor Allaert, Maarten Baes +11
We investigate the dust energy balance for the edge-on galaxy IC 2531, one of the seven galaxies in the HEROES sample. We perform a state-of-the-art radiative transfer modelling ba…
Robotic Astronomy with the Faulkes Telescopes and Las Cumbres Observatory Global Telescope
Fraser Lewis, Rachel Street, Paul Roche +2
We present results from ongoing science projects conducted by members of the Faulkes Telescope (FT) team and Las Cumbres Observatory Global Telescope (LCOGT). Many of these project…
Unifying disc-jet behaviour in X-ray binaries: an optical/IR approach
David M. Russell, Dipankar Maitra, Rob P. Fender +1
Synchrotron emission from jets produced by X-ray binaries can be detected at optical and infrared (IR) frequencies. I show that optical/IR colour-magnitude diagrams of the outburst…
Multiwavelength observations of the black hole transient Swift J1745-26 during the outburst decay
Emrah Kalemci, Mehtap Ozbey Arabaci, Tolga Guver +12
We characterized the broad-band X-ray spectra of Swift J1745-26 during the decay of the 2013 outburst using INTEGRAL ISGRI, JEM-X and Swift XRT. The X-ray evolution is compared to…
Monitoring LMXBs with the Faulkes Telescope
Fraser Lewis, David M. Russell, Rob P. Fender +1
The Faulkes Telescope Project is the educational arm of the Las Cumbres Observatory Global Telescope Network (LCOGT). It currently has two 2-metre robotic telescopes, located at Ha…
Seven reflares, a mini-outburst and an outburst : High amplitude optical variations in the black hole X-ray binary Swift J1910.2-0546
Payaswini Saikia, David M. Russell, Saarah F. Pirbhoy +5
We present long-term (2012-2022) optical monitoring of the candidate black hole X-ray binary Swift J1910.2-0546 with the Faulkes Telescopes and Las Cumbres Observatory (LCO) networ…
A Multi-wavelength Characterization of the 2023 Outburst of MAXI J1807+132: Manifestations of Disk Instability and Jet Emission
Sandeep K. Rout, M. Cristina Baglio, Andrew Hughes +19
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 i…
The long-term optical evolution of the black hole candidate MAXI J1659-152
Jesus M. Corral-Santana, Manuel A. P. Torres, Tariq Shahbaz +13
We present 5 years of optical and infrared data of the black hole candidate MAXI J1659-152 covering its 2010 outburst, decay and quiescence. Combining optical data taken during the…
Superorbital variability in the quiescent black hole X-ray transient A0620-00
Enzo A. Saavedra, Roi Alonso, Teo Muñoz-Darias +10
Quiescent black hole low-mass X-ray binaries provide a key setting for probing accretion physics at low luminosities. A0620-00, the archetypal system in this class, has remained in…
Chasing the break: Tracing the full evolution of a black hole X-ray binary jet with multi-wavelength spectral modeling
Constanza Echiburú-Trujillo, Alexandra J. Tetarenko, Daryl Haggard +35
Black hole X-ray binaries (BH XRBs) are ideal targets to study the connection between accretion inflow and jet outflow. Here we present quasi-simultaneous, multi-wavelength observa…
Optical Precursors to Black Hole X-ray Binary Outbursts: An evolving synchrotron jet spectrum in Swift J1357.2-0933
David M. Russell, Ahlam Al Qasim, Federico Bernardini +4
We present six years of optical monitoring of the black hole candidate X-ray binary Swift J1357.2-0933, during and since its discovery outburst in 2011. On these long timescales, t…
Gaia22dkvLb: A Microlensing Planet Potentially Accessible to Radial-Velocity Characterization
Zexuan Wu, Subo Dong, Tuan Yi +50
We report discovering an exoplanet from following up a microlensing event alerted by Gaia. The event Gaia22dkv is toward a disk source rather than the traditional bulge microlensin…
Multiwavelength monitoring of a very active dwarf nova AX J1549.85416 with an unusually high duty cycle
Guobao Zhang, Joseph D. Gelfand, David M. Russell +5
We present the results of our analysis of new optical, ultraviolet (UV) and X-ray observations of a highly variable source AX J1549.85416. Both the detection of several fast…
Properties and Evolution of the Redback Millisecond Pulsar Binary PSR J2129-0429
Eric C. Bellm, David L. Kaplan, Rene P. Breton +19
PSR J2129-0429 is a "redback" eclipsing millisecond pulsar binary with an unusually long 15.2 hour orbit. It was discovered by the Green Bank Telescope in a targeted search of unid…
The Accretion-Ejection Connection in the Black Hole X-ray Binary MAXI J1820070
Joe S. Bright, Rob Fender, David M. Russell +12
The black hole X-ray binary MAXI J1820070 began its first recorded outburst in March 2018, and remained an active radio, X-ray, and optical source for over four years. Due to th…
Determining the nature of IC 10 X-2: A comprehensive study of the Optical/Infrared emission from an extragalactic BeHMXB
Jwaher Alnaqbi, Joseph D. Gelfand, Payaswini Saikia +7
We present a comprehensive analysis of the optical and infrared (IR) properties of high-mass X-ray binary (HMXB) IC 10 X-2, classified as a super-giant HMXB and super-fast X-ray tr…
An Empirical Comparison of Parametric and Permutation Tests for Regression Analysis of Randomized Experiments
Kellie Ottoboni, Fraser Lewis, Luigi Salmaso
Hypothesis tests based on linear models are widely accepted by organizations that regulate clinical trials. These tests are derived using strong assumptions about the data-generati…
FTP and NSO: Astronomy With (Several) Robotic Telescopes
Fraser Lewis
We present details of two UK based robotic telescope projects, The Faulkes Telescope Project and the National Schools Observatory. We discuss details on how these projects utilise…
Gone with the Wind: JWST-MIRI Unveils a Strong Outflow from the Quiescent Stellar-Mass Black Hole A0620-00
Zihao Zuo, Gabriele Cugno, Joseph Michail +15
We present new observations of the black hole X-ray binary A0620-00 using the Mid-Infrared Instrument on the James Webb Space Telescope, during a state where the X-ray luminosity i…
Continued Monitoring of LMXBs with the Faulkes Telescopes
Fraser Lewis, David M. Russell, Rob P. Fender +2
The Faulkes Telescope Project is an educational and research arm of the Las Cumbres Observatory Global Telescope Network (LCOGTN). It has two 2-metre robotic telescopes, located at…
Discovery of a variable energy-dependent X-ray polarization in the accreting neutron star GX 5-1
Sergio Fabiani, Fiamma Capitanio, Rosario Iaria +116
We report on the coordinated observations of the neutron star low-mass X-ray binary (NS-LMXB) \gx in X-rays (IXPE, NICER, Nustar and INTEGRAL), optical (REM and LCO), near-infrared…
A multi-wavelength study of GRS 1716-249 in outburst : constraints on its system parameters
Payaswini Saikia, David M. Russell, M. C. Baglio +27
We present a detailed study of the evolution of the Galactic black hole transient GRS 1716-249 during its 2016-2017 outburst at optical (Las Cumbres Observatory), mid-infrared (Ver…
Monitoring LMXBs with the Faulkes Telescopes
Fraser Lewis, David M. Russell, Rob P. Fender +1
We have been undertaking a monitoring project of 13 low-mass X-ray binaries (LMXBs) using FT North since early 2006. The introduction of FT South has allowed us to extend this moni…
The Faulkes Telescope Project: Not Just Pretty Pictures
Fraser Lewis, Paul Roche
The Faulkes Telescope (FT) Project is an educational and research arm of the Las Cumbres Observatory Global Telescope Network (LCOGTN). As well as producing spectacular images of g…
Clockwise evolution in the hardness-intensity diagram of the black hole X-ray binary Swift J1910.2-0546
Payaswini Saikia, David M. Russell, Saarah F. Pirbhoy +5
We present a detailed study of optical data from the 2012 outburst of the candidate black hole X-ray binary Swift J1910.2-0546 using the Faulkes Telescope and Las Cumbres Observato…
Rapid variations of polarization in low-mass X-ray binaries
David M. Russell, Piergiorgio Casella, Rob Fender +4
Time-resolved optical and infrared polarimetric observations of black hole and neutron star low-mass X-ray binaries are presented. Data were acquired with the VLT, UKIRT and HIPPO…
Exotic optical variability in the black hole X-ray binary IGR J17091-3624
Payaswini Saikia, David M. Russell, D. M. Bramich +9
IGR J17091-3624 is a distinctive black hole X-ray binary exhibiting exotic variability, including complex "heartbeat" oscillations in its X-ray light curves, similar to those obser…