Neutron star X-ray binary jets are observed to be less luminous than those of black holes, and are also less observed and thus less understood. Modern radio facilities are sensitive enough to investigate these neutron star jets in detail and begin to look at their properties as has been done for black hole jets. I will present an archival radio data project that compares rapid variability...
Transitional millisecond pulsars (tMSPs) offer a unique opportunity to study jet formation in a low-accretion regime around fast-spinning, magnetized neutron stars. We analyzed archival spectral energy distributions of confirmed and candidate tMSPs to investigate their jet properties. In this presentation, I will focus on the candidate tMSP 4FGL J0427.8−6704, for which ALMA data revealed a...
The multi-wavelength spectral energy distributions of low-mass X-ray binaries (LMXBs) in the hard state are thought to be determined by the emission from a jet (up to mid-infrared frequencies) and the emission from the accretion flow from optical to X-ray up to (possibly) the soft gamma-ray domain. In recent years, the flat radio-to-mid-IR spectra of black hole (BH) X-ray binaries have been...
Circinus X-1 is a peculiar neutron star X-ray binary system (XRB) which defies conventional classification despite being studied for over 50 years. Surrounded by its natal supernova remnant aged at ~4600 years, Circinus X-1 is the youngest known XRB. However paradoxically, it displays many features common to older, low mass, low magnetic field neutron star XRBs. This provides a unique...
The radio:X-ray plane is a valuable tool to better understand the connection between accretion and jet production in X-ray binaries during their hard spectral states. This correlation was originally believed to be universal and observed to span many orders of magnitude in X-ray flux. It was later extended to active galactic nuclei by including an additional mass term. However, doubt has since...
Jets from black-hole X-ray binary systems (BH-XRBs) are powerful outflows that release a large fraction of the accretion energy to the surrounding environment, providing a feedback mechanism that alters the properties of the interstellar medium (ISM). Studying accretion processes alongside their feedback on the environment is crucial, as it enables to estimate the energy input/output around...
Relativistic jets launched from accreting compact objects are thought to play an important role in our Universe, influencing large-scale processes such as galaxy evolution and star formation. However, the connection between their properties and those of the accretion flow remains poorly understood. Multi-wavelength time-domain observations of black hole X-ray binaries now offer a new avenue to...
I will discuss a few applications of the use of counterjets in X-ray binaries. First, their eclipses can be used to measure binary system properties and map out the structures and speeds of relativistic jets. Second, they can be used to understand whether jets are emitted asymmetrically on short timescales, as predicted by theoretical models, but differently from what is observed on long timescales.
