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Mass accretion and ejection in transitional millisecond pulsars

The behaviour of matter under extreme conditions and the reason why accretion onto many astrophysical objects is accompanied by outflows of plasma like jets, are key questions of astrophysical research. Neutron stars (NSs) are pr... ver más

03/04/2018

INAF

168K€

Presupuesto del proyecto: 168K€

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ISTITUTO NAZIONALE DI ASTROFISICA No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

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Financiación concedida El organismo H2020 notifico la concesión del proyecto el día 2018-04-03

MSCA-IF-2014-EF: Marie Skłodowska-Curie Individual F... Scope:Proposals for European Fellowships involve a single host organisation (future beneficiary) est...

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INAF

168.28K€ | Lider

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Duración del proyecto: 35 meses Fecha Inicio: 2015-04-14
Fecha Fin: 2018-04-03

Líder del proyecto

ISTITUTO NAZIONALE DI ASTROFISICA No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Presupuesto del proyecto 168K€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto The behaviour of matter under extreme conditions and the reason why accretion onto many astrophysical objects is accompanied by outflows of plasma like jets, are key questions of astrophysical research. Neutron stars (NSs) are prime laboratories for this investigation. They are the solid-surface bodies in which the most extreme conditions of gravity, density, pressure and magnetization are realized. When they are part of a binary system, and matter is transferred from their companion star, several phenomena occur which have shed light on the physics of mass accretion and NS magnetospheres, as well as the production of high energy radiation and pulsations. An important new class of pulsars spinning at a period of few milliseconds and switching between plasma accretion and ejection was discovered in 2013; they are dubbed transitional millisecond pulsars. These sources alternate between radio and X-ray pulsar regimes as a result of the interaction between the in-flowing plasma and the outward pressure exerted by their magnetosphere and radiation. They experience over few weeks transitions from a rotationally powered regime, in which they behave like radio pulsars, to a regime in which they accrete matter and emit intense high-energy radiation, like standard X-ray binary systems. In between these regimes these NSs display intermediate states which are still to be investigated in detail. Transitional millisecond pulsars provide us with a unique laboratory to study the interaction between the matter inflowing towards the NS, its rotating magnetosphere and the outgoing radiation, particle wind and jets. With this program based on multi-waveband (radio, optical, X-rays, gamma-rays) observations, we will exploit the diagnostic potential of these systems to (i) determine how outflows of plasma are launched and how they are coupled to the accretion process; (ii) measure their mass and spin to constrain their evolutionary state; (iii) study the formation of accretion disks.

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