Freddi: Fast Rise Exponential Decay accretion Disk model Implementation

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Ada Coda
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Freddi: Fast Rise Exponential Decay accretion Disk model Implementation

Post by Ada Coda » Mon Oct 31, 2016 3:01 am

Freddi: Fast Rise Exponential Decay accretion Disk model Implementation

Abstract: Freddi (Fast Rise Exponential Decay: accretion Disk model Implementation) solves 1-D evolution equations of the Shakura-Sunyaev accretion disk. It simulates fast rise exponential decay (FRED) light curves of low mass X-ray binaries (LMXBs). The basic equation of the viscous evolution relates the surface density and viscous stresses and is of diffusion type; evolution of the accretion rate can be found on solving the equation. The distribution of viscous stresses defines the emission from the source. The standard model for the accretion disk is implied; the inner boundary of the disk is at the ISCO or can be explicitely set. The boundary conditions in the disk are the zero stress at the inner boundary and the zero accretion rate at the outer boundary. The conditions are suitable during the outbursts in X-ray binary transients with black holes. In a binary system, the accretion disk is radially confined. In Freddi, the outer radius of the disk can be set explicitely or calculated as the position of the tidal truncation radius.

Credit: Malanchev, K. L.; Lipunova, G. V.

Site: https://github.com/hombit/freddi/
https://ui.adsabs.harvard.edu/abs/2017MNRAS.468.4735L

Bibcode: 2016ascl.soft10014M

Preferred citation method: https://ui.adsabs.harvard.edu/abs/2017MNRAS.468.4735L

ID: ascl:1610.014
Last edited by Ada Coda on Tue Jun 09, 2020 10:26 am, edited 1 time in total.
Reason: Updated code entry.

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