jla¶
Supernova likelihood for SDSS-II/SNLS3
File |
supernovae/jla_v3/jla.so |
Attribution |
Marc Betoule |
URL |
|
Citations |
This JLA code uses 731 supernovae from the JLA SDSS-II/SNLS3 sample to get a likelihood of a given theory mu(z).
Systematic error propagation is done with a collection of separate covariance matrices for the various light-curve parameters.
You can copy the standard parameters to use for this from demos/demo5.ini
Assumptions¶
SALT2 used to fit light curves
Akima interpolation between mu(z) samples
Setup Parameters¶
Name |
Type |
Default |
Description |
|---|---|---|---|
data_dir |
str |
Dir for other files. Use cosmosis-standard-library/supernovae/jla_v3/data (unless trying a different data set) |
|
data_file |
str |
Dir for other files. Use jla_lcparams.txt (unless trying a different data set) |
|
scriptmcut |
str |
Dir for other files. Use 10.0 |
|
mag_covmat_file |
str |
Dir for other files. Use jla_v0_covmatrix.dat |
|
stretch_covmat_file |
str |
Dir for other files. Use jla_va_covmatrix.dat |
|
colour_covmat_file |
str |
Dir for other files. Use jla_vb_covmatrix.dat |
|
mag_stretch_covmat_file |
str |
Dir for other files. Use jla_v0a_covmatrix.dat |
|
mag_colour_covmat_file |
str |
Dir for other files. Use jla_v0b_covmatrix.dat |
|
stretch_colour_covmat_file |
str |
Dir for other files. Use jla_vab_covmatrix.dat |
Input values¶
Section |
Name |
Type |
Default |
Description |
|---|---|---|---|---|
distances |
z |
real 1d |
Redshift sample values for theory |
|
mu |
real 1d |
Theory distance modulus at sample redshifts |
||
supernova_params |
alpha |
real |
SN shape parameter coefficient |
|
beta |
real |
SN color parameter coefficient |
||
M |
real |
SN magnitude parameter baseline value; leave this fixed and vary deltaM. |
||
deltaM |
real |
SN magnitude parameter where M_actual = M + deltaM |
Output values¶
Section |
Name |
Type |
Description |
|---|---|---|---|
likelihoods |
JLA_LIKE |
real |
Gaussian likelihood for this data set and theory mu(z) |