Module LALSimNSBHProperties.c

Detailed Description

Provides routines for NSBH waveform models.

Author

Andrew Matas, Jonathan Thompson, Edward Fauchon-Jones, Sebastian Khan

Kerr routines
double	XLALSimNSBH_fGWinKerr (const REAL8 r, const REAL8 M, const REAL8 a)
	GW frequency for a particle on Kerr. More...
double	XLALSimNSBH_rKerrISCO (const REAL8 a)
	Kerr BH ISCO radius. More...

NSBH routines
double	XLALSimNSBH_xi_tide (const REAL8 q, const REAL8 a, const REAL8 mu)
	Relativistic correction to orbital radius at mass-shedding. More...
double	XLALSimNSBH_compactness_from_lambda (const REAL8 Lambda)
	Compactness as a function of tidal deformability. More...
double	XLALSimNSBH_torus_mass_fit (const REAL8 q, const REAL8 a, const REAL8 C)
	Baryonic mass of the torus remnant of a BH-NS merger. More...

Function Documentation

XLALSimNSBH_fGWinKerr()

double XLALSimNSBH_fGWinKerr	(	const REAL8	r,
		const REAL8	M,
		const REAL8	a
	)

GW frequency for a particle on Kerr.

GW frequency (in units of inverse M_BH) for a particle at a given separation r from a Kerr BH with mass M and dimensionless spin parameter a.

Parameters

r	Separtion
M	Kerr BH mass
a	Dimensionless spin parameter

Definition at line 49 of file LALSimNSBHProperties.c.

XLALSimNSBH_rKerrISCO()

double XLALSimNSBH_rKerrISCO

(

const REAL8

a

)

Kerr BH ISCO radius.

Kerr BH ISCO radius for a BH with unit mass as a function of its dimensionless spin parameter.

Parameters

a	Dimensionless spin parameter

Definition at line 63 of file LALSimNSBHProperties.c.

XLALSimNSBH_xi_tide()

double XLALSimNSBH_xi_tide	(	const REAL8	q,
		const REAL8	a,
		const REAL8	mu
	)

Relativistic correction to orbital radius at mass-shedding.

Relativistic correction to the standard Newtonian estimate of the orbital radius at mass-shedding. See Eq. (8) in https://arxiv.org/abs/1509.00512 for a description of the implicit equation for xi_tide.

Parameters

q	Mass ratio of the NSBH system M_BH/M_NS > 1
a	The BH dimensionless spin parameter
mu	The ratio of the BH and the NS radius M_BH/R_NS = q*C where C is the compactness C = M_NS/R_NS.

Definition at line 89 of file LALSimNSBHProperties.c.

XLALSimNSBH_compactness_from_lambda()

double XLALSimNSBH_compactness_from_lambda

(

const REAL8

Lambda

)

Compactness as a function of tidal deformability.

For Lambda > 1 this computes the NS compactness from the tidal deformability as described by the universal relation from N. Yagi and N. Yunes, Phys. Rep. 681 (2017), Eq. (78).

For Lambda <= 1 this extrapolates to the BH limit such that the interpolation over [0, 1] is C^1 continuous as Lambda=1.

Parameters

Lambda

Dimensionless tidal deformability

Definition at line 140 of file LALSimNSBHProperties.c.

XLALSimNSBH_torus_mass_fit()

double XLALSimNSBH_torus_mass_fit	(	const REAL8	q,
		const REAL8	a,
		const REAL8	C
	)

Baryonic mass of the torus remnant of a BH-NS merger.

Baryonic mass of the torus remnant of a BH-NS merger in units of the NS baryonic mass. See arXiv:1207.6304v1 for details on the "Newtonian" and the "relativistic" fits.

See Eq. (11) in https://arxiv.org/abs/1509.00512 for the definition of this quantity.

Parameters

q	The binary mass ratio (assumes q>1)
a	The BH dimensionless spin parameter
C	Neutron star compactness.

Definition at line 168 of file LALSimNSBHProperties.c.