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bug fix and new function in NSBH ejecta fits #381

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Aug 21, 2024
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bug fix and new function in NSBH ejecta fits #381

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19 changes: 11 additions & 8 deletions nmma/joint/conversion.py
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Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,13 @@ def chibh2risco(self, chi_bh):

return 3.0 + Z2 - np.sign(chi_bh) * np.sqrt((3.0 - Z1) * (3.0 + Z1 + 2.0 * Z2))

def baryon_mass_NS(self, source_mass, compactness):
"""
equation (7) in https://arxiv.org/abs/2002.07728
"""

return source_mass * (1.0 + 0.6 * compactness / (1.0 - 0.5 * compactness))

def remnant_disk_mass_fitting(
self,
mass_1_source,
Expand All @@ -125,9 +132,7 @@ def remnant_disk_mass_fitting(

# use the BH spin to find the normalized risco
risco = self.chibh2risco(chi_bh)
bayon_mass_2 = (
mass_2_source * (1.0 + 0.6 * compactness_2 / (1.0 - 0.5 * compactness_2))
)
baryon_mass_2 = self.baryon_mass_NS(mass_2_source, compactness_2)

remant_mass = (
a * np.power(symm_mass_ratio, -1.0 / 3.0) * (1.0 - 2.0 * compactness_2)
Expand All @@ -138,7 +143,7 @@ def remnant_disk_mass_fitting(

remant_mass = np.power(remant_mass, 1.0 + d)

remant_mass *= bayon_mass_2
remant_mass *= baryon_mass_2

return remant_mass

Expand All @@ -163,9 +168,7 @@ def dynamic_mass_fitting(

# use the BH spin to find the normalized risco
risco = self.chibh2risco(chi_bh)
bayon_mass_2 = (
mass_2_source * (1.0 + 0.6 * compactness_2 / (1.0 - 0.5 * compactness_2))
)
baryon_mass_2 = self.baryon_mass_NS(mass_2_source, compactness_2)

mdyn = (
a1
Expand All @@ -174,7 +177,7 @@ def dynamic_mass_fitting(
/ compactness_2
)
mdyn += -a2 * np.power(mass_ratio_invert, n2) * risco + a4
mdyn *= bayon_mass_2
mdyn *= baryon_mass_2

mdyn = np.maximum(0.0, mdyn)

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