The many tones of accretion - to the memory of Tomaso Belloni

Session

Accretion Physics & Spectral States. Session 1.1: Accretion Foundation

7 Sept 2026, 12:00

Cefalù

40. New results on winds from accretion discs in binaries

chris done (university of Durham)

07/09/2026, 12:00

Talk

I will review observations and theory of winds in accreting binaries.

44. Determination of accretion disk inner radius taking angular momentum exchange into account: transients, transitions and evolution

Ali Alpar (Sabanci University)

07/09/2026, 12:30

Talk

The determination of the inner radius of an accretion disk needs to take into account the rotation rates of the disk and the neutron star and the angular momentum exchange between the disk and the star. When angular momentum is taken into account, with conditions to accrete or expel matter, the inner radius is found to lie closer to the corotation radius, rather than the Alfven radius,...

39. Accreting Millisecond X-ray Pulsars: Insights into Accretion and Spin Evolution

Andrea Sanna (Istituto Nazionale di Astrofisica (INAF))

07/09/2026, 12:45

Low-mass X-ray binaries are interacting systems in which a compact object accretes matter from a low-mass companion star, releasing most of its energy in the X-ray band. When the compact object is a neutron star, these systems provide unique laboratories to investigate accretion physics under extreme conditions of gravity, density, and magnetic field strength.

Among them, accreting...

26. A Self-Shadowing Black Hole Accretion Disc during a Soft State Decay

Montserrat Armas Padilla (Instituto de Astrofísica de Canarias (IAC))

07/09/2026, 15:00

Talk

The geometry and physical conditions of black hole accretion discs are expected to change dramatically as a function of mass accretion rate and the resulting X-ray luminosity. Theoretical models predict that these changes become particularly relevant as the luminosity approaches the Eddington limit (LEdd), a regime where the standard thin-disc solution is thought to break down in favour of...

6. Geometry of X-ray sources in accreting black-hole binaries

Mr Andrzej Zdziarski (N. Copernicus Astronomical Center)

07/09/2026, 15:15

Talk

The structure of X-ray sources in the hard spectral state of accreting black hole binaries has been a subject of intense debate for many years. There are two main scenarios. In one, the accretion disk disappears below a certain radius and is replaced by a hot flow that emits hard X-rays. In the other, the disk continues to the innermost stable circular orbit, and the hard X-ray source is...