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arxiv: 2606.25515 · v1 · pith:BL5AR4P2new · submitted 2026-06-24 · 🌌 astro-ph.HE

Accreting Compact Object Binaries with the SKA

Pith reviewed 2026-06-25 20:58 UTC · model grok-4.3

classification 🌌 astro-ph.HE
keywords accreting binariescompact objectsSKArelativistic jetsblack hole X-ray binariesneutron starswhite dwarfsaccretion-ejection coupling
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The pith

The SKA will extend jet and accretion studies from bright black hole binaries to fainter neutron star and white dwarf systems plus nearby galaxies.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

Accreting compact object binaries let observers watch how matter falls in and launches jets on human timescales, with patterns that scale across stellar-mass to supermassive objects. The paper claims the SKA's gains in point-source sensitivity, surface-brightness sensitivity, angular resolution, and frequency coverage will open these processes to populations now too faint or distant to study in detail. This means moving from existing black-hole work to neutron-star and white-dwarf accretors, uncovering hidden quiescent systems, and reaching rare high-accretion phases in external galaxies.

Core claim

Accreting binary systems provide a time-resolved view of the accretion and ejection processes that are seen in all classes of compact objects, from stellar-mass to supermassive. They allow us to study the launching of relativistic jets on human timescales, probing how the jets are coupled to the underlying accretion flow, and providing unique insights that can be extended to supermassive black holes via the well-established mass scale invariance. The SKA will enhance such studies via its high point source and surface brightness sensitivity, high angular resolution, and broad frequency coverage. This will enable the extension of our existing black hole studies to the fainter accreting neutron

What carries the argument

The SKA's high point-source sensitivity, surface-brightness sensitivity, angular resolution, and broad frequency coverage applied to radio emission from jets in accreting binaries.

If this is right

  • Jet-launching studies can now include the effects of stellar surfaces and magnetic fields in neutron stars and white dwarfs.
  • A more complete census of Galactic black holes becomes possible through detection of their quiescent, low-luminosity states.
  • Rare high-accretion-rate phases that trace black-hole growth can be observed directly in nearby galaxies.
  • Comparative samples across compact-object types will test how mass, spin, and magnetic field strength control jet power.
  • Feedback from jets into the interstellar medium can be quantified for a wider range of source luminosities.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Successful SKA observations would strengthen the mass-scaling argument that links stellar-mass jet physics to active galactic nuclei.
  • Detection of many new quiescent systems could revise estimates of the total number and evolutionary lifetimes of compact-object binaries.
  • Broad frequency coverage may allow spectral decomposition of jet emission that is currently blended in lower-sensitivity data.
  • The same sensitivity leap could be used to search for radio counterparts to gravitational-wave events involving compact objects.

Load-bearing premise

The SKA will reach its planned sensitivity, resolution, and frequency performance, and that jet-accretion coupling relations measured in bright black holes will continue to hold for much fainter neutron-star, white-dwarf, and extragalactic systems.

What would settle it

After SKA operations begin, no new population of faint accreting neutron-star or white-dwarf binaries is detected in the Galactic plane or Magellanic Clouds, and no resolved jets appear in any nearby galaxy despite the predicted sensitivity gain.

Figures

Figures reproduced from arXiv: 2606.25515 by Aru Beri, Francesco Carotenuto, Jakob van den Eijnden, James C.A. Miller-Jones, Rob P. Fender, Sara Motta, Valeriu Tudose.

Figure 1
Figure 1. Figure 1: Radio/X-ray luminosity plane, showing the measured positions of a sample of black hole and neu￾tron star X-ray binaries, indicating the (unshaded) region accessible to SKA-VLBI astrometric observations (detection threshold 10 𝜇Jy) for a source at 4 kpc (Bahramian and Rushton, 2022). 8 Comparing Black Holes and Neutron Stars: Dissecting the Physics of Jet Launching The SKA will revolutionize comparative jet… view at source ↗
read the original abstract

Accreting binary systems provide a time-resolved view of the accretion and ejection processes that are seen in all classes of compact objects, from stellar-mass to supermassive. They allow us to study the launching of relativistic jets on human timescales, probing how the jets are coupled to the underlying accretion flow, and providing unique insights that can be extended to supermassive black holes via the well-established mass scale invariance. Comparative studies of jets from different classes of compact objects allow us to determine the impact of mass, spin, magnetic fields, and stellar surfaces on the launching of jets. The jets from black hole X-ray binaries provide probes of the Galactic black hole population, and an important source of feedback to the surrounding interstellar medium. While existing radio facilities (including the SKA precursors) have made great progress in this field in recent years, the SKA will enhance such studies via its high point source and surface brightness sensitivity, high angular resolution, and broad frequency coverage. This will enable the extension of our existing black hole studies to the fainter accreting neutron star and white dwarf population, the detection of previously-undiscovered systems in a low-luminosity quiescent state, and the extension of our studies to nearby galaxies, revealing rare, high-accretion rate systems that probe a key phase of black hole growth.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 1 minor

Summary. The manuscript presents a forward-looking science case for using the Square Kilometre Array (SKA) to study accreting compact object binaries. It reviews how these systems provide time-resolved views of accretion-jet coupling across stellar-mass to supermassive scales, and argues that the SKA's point-source and surface-brightness sensitivity, angular resolution, and frequency coverage will extend existing black-hole X-ray binary work to fainter neutron-star and white-dwarf populations, enable detection of quiescent systems, and permit studies in nearby galaxies.

Significance. If the projected SKA performance specifications are realized, the paper supplies a useful roadmap for comparative jet studies and for probing rare high-accretion phases of black-hole growth. The arguments rest on established mass-scaling relations and standard assumptions about instrument performance rather than new derivations or data.

minor comments (1)
  1. [Abstract] Abstract, final paragraph: the claim that SKA will enable extension to nearby galaxies would be strengthened by a brief, explicit citation to the relevant SKA design sensitivity or resolution figures that support the extragalactic reach.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their supportive summary and recommendation of minor revision. The review correctly identifies the manuscript as a forward-looking perspective paper that relies on established scaling relations and instrument projections rather than new derivations.

Circularity Check

0 steps flagged

No significant circularity in this science case review

full rationale

This is a forward-looking perspective paper outlining a science case for SKA observations of accreting binaries. It contains no derivations, equations, fitted parameters, model predictions, or uniqueness theorems. All statements about SKA capabilities and extensions to neutron star/white dwarf populations or nearby galaxies are prospective applications of established accretion-jet scaling relations and instrument specifications, with no self-referential reduction, self-citation load-bearing, or renaming of results. The text is self-contained against external benchmarks of radio astronomy capabilities and does not invoke any internal consistency checks that loop back to its own inputs.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No free parameters, axioms, or invented entities are introduced; the paper is a review of anticipated observational capabilities without derivations or new postulates.

pith-pipeline@v0.9.1-grok · 5791 in / 1039 out tokens · 15568 ms · 2026-06-25T20:58:35.567655+00:00 · methodology

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