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Role of Biermann Battery Mechanism in Appearance of Magnetic Fields in Accretion Discs
AbstractAt present, there is little doubt that accretion discs surrounding compact astrophysical objects such as black holes, white dwarfs, and...
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A model on transition between steady states of sub-Keplerian accretion discs: implication for spectral states and hot corona above the disc
We present here a simple hydrodynamic model based on a sequence of steady states of the inner sub-Keplerian accretion disc to understand its...
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Small-Scale Dynamo in Accretion Discs
AbstractSmall-scale magnetic field is suggested as a mechanism for magnetic field self-excitation in accretion discs. Main features of small-scale...
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Multi-criticality and related bifurcation in accretion discs around non-rotating black holes: an analytical study
Low angular momentum, general relativistic, axially symmetric accretion of hydrodynamic fluid onto Schwarzschild black holes may undergo more than...
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The Destruction of Circumstellar Discs
We present the results of Nbody simulations of the Orion Nebula Cluster which keep track of the destruction of discs by star-disc collisions and...
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Dust dynamics in planet-forming discs in binary systems
In multiple stellar systems, interactions among the companion stars and their discs affect planet formation. In the circumstellar case, tidal...
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Close encounters: How stellar flybys shape planet-forming discs
We review the role of stellar flybys and encounters in shaping planet-forming discs around young stars, based on the published literature on this...
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Analysis of Dyonic ModMax black hole through accretion disk
In the present study, we probe the geodesic motion and accretion of particles around the spherically symmetric Dyonic ModMax black hole using...
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The influence of realistic cooling on the structure and spectrum of self-gravitating protoplanetary discs
Protoplanetary gas discs are affected by gravitational instability (GI) during their evolution. In the nonlinear regime, self-gravitating turbulence,...
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Circular orbits of accretion flow around charged black hole coupled with a nonlinear electrodynamics field
This study investigates the particle’s geodesic motion and accretion around the spherically symmetric Reissner–Nordström black hole coupled with a...
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Thin accretion disk signatures in hybrid metric-Palatini gravity
In the present work, accretion onto a static spherically symmetric black hole in the hybrid metric-Palatini gravity is considered. The Novikov–Thorne...
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Modelling photoevaporation in planet forming discs
Planets are born from the gas and dust discs surrounding young stars. Energetic radiation from the central star can drive thermal outflows from the...
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Probing Black-Hole Accretion Through Time Variability
Flux variability is a remarkable property of black hole (BH) accreting systems and a powerful tool to investigate the multi-scale structure of the...
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Course 4: Accretion-Ejection Models of Astrophysical Jets
Astrophysical jets are almost always associated with accreting objects, be they young stellar objects or massive black holes. Their role in the...
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On dark energy effects on the accretion physics around a Kiselev spinning black hole
Kiselev metric in the static and rotating form is widely used to test different aspects of the dark energy ( DE ) effects. We consider a DE Kiselev...
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The external photoevaporation of planet-forming discs
Planet-forming disc evolution is not independent of the star formation and feedback process in giant molecular clouds. In particular, OB stars emit...
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Outflowing Coronae Above Accretion Discs in AGN and GBH
We discuss the role of the coronal outflow perpendicular to the disc surface and study the problem of its influence on spectral shape and on the...
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Measuring the Masses and Accretion Rates in Rapidly Growing Young NLS1s
We find that Narrow-Line Seyfert 1 Galaxies accrete at moderately super-Eddington rates. This was already suggested with the discovery of extreme...
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The Physics of Accretion Discs, Winds and Jets in Tidal Disruption Events
Accretion onto black holes is an efficient mechanism in converting the gas mass-energy into energetic outputs as radiation, wind and jet. Tidal...
