Colloquium
The delicate interplay between accretion, ejection and magnetism in neutron stars X-ray binaries

Dr. Alessio Marino
See the live streaming of this talk on Thursday June 12, 10:30 GMT+1).

Resumen

 

Matter ejection, in the form of either winds or jets, is ubiquitous in accreting X-ray binaries. Although it is clear that accretion and ejection are profoundly intertwined in these types of systems, the origin and the details of such an interconnection are yet to be unraveled. This is particularly true for systems where a low-magnetized neutron star (NS) accretes matter from a low-mass companion star (NS low-mass X-ray binaries, LMXBs). Indeed, unlike the case of accreting black holes, in NS LMXBs the already delicate interplay between accretion and ejection may be further complicated by the presence of, e.g., the NS magnetic field, the boundary layer and the emission from the NS surface. For instance, jets in NS LMXBs have been claimed to be more collimated than in BH LMXBs, their occurrence sometimes seems to be unrelated to the spectral state and their observed radio luminosity show a rather scattered distribution. X-ray winds on the other hand have been often detected in states where they were not expected, in particular in a class of NS LMXBs, the Accreting Millisecond X-ray Pulsars (AMXPs), where the channeling of the accretion flow along the magnetic field lines makes these systems visible as rapidly spinning X-ray pulsars. Finally, AMXPs typically drive more powerful jets than other (non-pulsating) NS LMXBs and their rapid orbital expansion can be explained by strong mass outflows. In this talk, I will review the emerging pattern of peculiar outflows in NS LMXBs, the possible implications for jet and wind-launching mechanisms in these systems and the key role that future multi-band observing campaigns will play in clarifying its physical origin.

Zoom link: https://rediris.zoom.us/j/97431924964?pwd=rpPDNaL2VrEKfs8TSZNyck8GbTnjnZ.1
Meeting ID: 974 3192 4964

Passcode: 078804

Youtube: https://youtube.com/live/ZO-hf7iNPRw?feature=share

Sobre la charla

The delicate interplay between accretion, ejection and magnetism in neutron stars X-ray binaries
Dr. Alessio Marino
Thursday June 12, 2025 - 10:30 GMT+1  (Aula)
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Sobre el conferenciante

IAC Early Career Program

Alessio Marino (he/him), from Palermo, Italy, completed his PhD in 2021 through a joint program between the Universities of Toulouse and Palermo, focusing on accretion discs and jets in X-ray binaries. He then joined the Institute of Space Sciences in Barcelona as a postdoc where he is currently working. His research covers multi-band observations of Galactic X-ray sources, including low- and high-mass X-ray binaries and isolated neutron stars. He is also an associated ESA member of the Einstein Probe consortium and part of several other international collaborations, such as Theseus and eXTP.