petitRADTRANS.chemistry.vapour_pressures

This module provides vapor pressure curves for various condensate species.

Functions

vapour_pressure_fe_solid(temperature)
vapour_pressure_fe_liquid(temperature)
vapour_pressure_mgsio3(temperature)
vapour_pressure_mg2sio4(temperature[, metallicity])	Total pressure of condensation, not the species' vapor pressure like for most of the other species.
vapour_pressure_na2s(temperature[, metallicity, ...])
vapour_pressure_kcl(temperature)	Notes
vapour_pressure_sio(temperature)
vapour_pressure_tio2(temp[, metallicity])	Compute vapor pressure curve for TiO2.
vapour_pressure_cr(temp[, metallicity])	Compute vapor pressure curve for Cr.
vapour_pressure_zns(temp[, metallicity])	Compute vapor pressure curve for ZnS.
vapour_pressure_nh3(temp[, metallicity])	Compute vapor pressure curve for NH3.
vapour_pressure_mns(temp[, metallicity])	Compute vapor pressure curve for MnS.
vapour_pressure_h2o(temp[, do_buck, metallicity])	Compute vapor pressure curve for H2O.
vapour_pressure_ch4(temp[, metallicity])	Compute vapor pressure curve for CH4.
vapour_pressure_al2o3(temp[, metallicity])	Compute vapor pressure curve for Al2O3.
vapour_pressure_catio3(temp, p[, metallicity])	Compute vapor pressure curve for CaTiO3.
vapour_pressure_caal12o19(temp, p[, metallicity])	Compute vapor pressure curve for CaAl12O19.
vapour_pressure_sio2(temp[, metallicity])	Compute vapor pressure curve for SiO2.

Module Contents

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_fe_solid(temperature)

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_fe_liquid(temperature)

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_mgsio3(temperature)

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_mg2sio4(temperature, metallicity=None)

Total pressure of condensation, not the species’ vapor pressure like for most of the other species.

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_na2s(temperature, metallicity=0.0, na2s_mass_fraction=None, mmw=2.33)

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_kcl(temperature)

Notes

[1]

Morley, C.~V., Fortney, et a. 2012. Neglected Clouds in T and Y Dwarf Atmospheres. The Astrophysical Journal 756. doi:10.1088/0004-637X/756/2/172

[2]

Lodders, K. 1999. Alkali Element Chemistry in Cool Dwarf Atmospheres. The Astrophysical Journal 519, 793–801. doi:10.1086/307387

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_sio(temperature)

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_tio2(temp, metallicity=0)

Compute vapor pressure curve for TiO2.

Args:

temp: float or ndarray

Temperature (K)

metallicity: float

Metallicity relative to solar in log10 units (default: 0 = 1X solar)

Returns:

float or ndarray

Vapor pressure in dyne/cm^2

References:

[1] Marley M. S., Saumon D., Visscher C., Lupu R., Freedman R.,

Morley C., Fortney J. J., et al., 2021, ApJ, 920, 85. doi:10.3847/1538-4357/ac141d

[2] Virga: natashabatalha/virga

Moran et al. 2025 https://ui.adsabs.harvard.edu/abs/2025ApJ…994..116M/abstract

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_cr(temp, metallicity=0)

Compute vapor pressure curve for Cr.

Args:

temp: float or ndarray

Temperature (K)

metallicity: float

Metallicity relative to solar in log10 units (default: 0 = 1X solar)

Returns:

float or ndarray

Vapor pressure in dyne/cm^2

References:

[1] Morley, Caroline V., et al. “Neglected clouds in T and Y dwarf

atmospheres.” The Astrophysical Journal 756.2 (2012): 172.

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_zns(temp, metallicity=0)

Compute vapor pressure curve for ZnS.

Args:

temp: float or ndarray

Temperature (K)

metallicity: float

Metallicity relative to solar in log10 units (default: 0 = 1X solar)

Returns:

float or ndarray

Vapor pressure in dyne/cm^2

References:

[1] Morley, Caroline V., et al. “Neglected clouds in T and Y dwarf

atmospheres.” The Astrophysical Journal 756.2 (2012): 172.

[2] Visscher, Channon, Katharina Lodders, and Bruce Fegley Jr.

“Atmospheric chemistry in giant planets, brown dwarfs, and low-mass dwarf stars. II. Sulfur and phosphorus.” The Astrophysical Journal 648.2 (2006): 1181.

[3] Virga: natashabatalha/virga

Moran et al. 2025 https://ui.adsabs.harvard.edu/abs/2025ApJ…994..116M/abstract

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_nh3(temp, metallicity=0)

Compute vapor pressure curve for NH3.

Args:

temp: float or ndarray

Temperature (K)

metallicity: float

Metallicity relative to solar in log10 units (default: 0 = 1X solar)

Returns:

float or ndarray

Vapor pressure in dyne/cm^2

References:

[1] Lodders, K. & Fegley, B. 1998, The planetary scientist’s

companion / Katharina Lodders, Bruce Fegley. New York: Oxford University Press, 1998. QB601 .L84 1998

[2] Virga: natashabatalha/virga

Moran et al. 2025 https://ui.adsabs.harvard.edu/abs/2025ApJ…994..116M/abstract

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_mns(temp, metallicity=0)

Compute vapor pressure curve for MnS.

Args:

temp: float or ndarray

Temperature (K)

metallicity: float

Metallicity relative to solar in log10 units (default: 0 = 1X solar)

Returns:

float or ndarray

Vapor pressure in dyne/cm^2

References:

[1] Morley, Caroline V., et al. “Neglected clouds in T and Y dwarf

atmospheres.” The Astrophysical Journal 756.2 (2012): 172.

[2] Visscher, Channon, Katharina Lodders, and Bruce Fegley Jr.

“Atmospheric chemistry in giant planets, brown dwarfs, and low-mass dwarf stars. II. Sulfur and phosphorus.” The Astrophysical Journal 648.2 (2006): 1181.

[3] Virga: natashabatalha/virga

Moran et al. 2025 https://ui.adsabs.harvard.edu/abs/2025ApJ…994..116M/abstract

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_h2o(temp, do_buck=True, metallicity=0)

Compute vapor pressure curve for H2O.

Args:

temp: float or ndarray

Temperature (K)

do_buck: bool

If True, use Buck (1981) expression. If False, use Wexler’s.

metallicity: float

Metallicity relative to solar in log10 units (default: 0 = 1X solar)

Returns:

float or ndarray

Vapor pressure in dyne/cm^2

References:

[1] Lodders, K. & Fegley, B. 1998, The planetary scientist’s

companion / Katharina Lodders, Bruce Fegley. New York: Oxford University Press, 1998. QB601 .L84 1998

[2] Buck, Arden L. “New equations for computing vapor pressure and

enhancement factor.” Journal of Applied Meteorology and Climatology 20.12 (1981): 1527-1532.

[3] Flatau, Piotr J., Robert L. Walko, and William R. Cotton.

“Polynomial fits to saturation vapor pressure.” Journal of Applied Meteorology 31.12 (1992): 1507-1513.

[4] Virga: natashabatalha/virga

Moran et al. 2025 https://ui.adsabs.harvard.edu/abs/2025ApJ…994..116M/abstract

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_ch4(temp, metallicity=0)

Compute vapor pressure curve for CH4.

Args:

temp: float or ndarray

Temperature (K)

metallicity: float

Metallicity relative to solar in log10 units (default: 0 = 1X solar)

Returns:

float or ndarray

Vapor pressure in dyne/cm^2

References:

[1] Lodders, K. & Fegley, B. 1998, The planetary scientist’s

companion / Katharina Lodders, Bruce Fegley. New York: Oxford University Press, 1998. QB601 .L84 1998

[2] Virga: natashabatalha/virga

Moran et al. 2025 https://ui.adsabs.harvard.edu/abs/2025ApJ…994..116M/abstract

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_al2o3(temp, metallicity=0)

Compute vapor pressure curve for Al2O3.

Args:

temp: float or ndarray

Temperature (K)

metallicity: float

Metallicity relative to solar in log10 units (default: 0 = 1X solar)

Returns:

float or ndarray

Vapor pressure in dyne/cm^2

References:

[1] Wakeford, Hannah R., et al. “High temperature condensate clouds

in super-hot Jupiter atmospheres.” Monthly Notices of the Royal Astronomical Society (2016): stw2639.

[2] Virga: natashabatalha/virga

Moran et al. 2025 https://ui.adsabs.harvard.edu/abs/2025ApJ…994..116M/abstract

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_catio3(temp, p, metallicity=0)

Compute vapor pressure curve for CaTiO3.

Args:

temp: float or ndarray

Temperature (K)

p: float

Pressure (dyne/cm^2)

metallicity: float

Metallicity relative to solar in log10 units (default: 0 = 1X solar)

Returns:

float or ndarray

Vapor pressure in dyne/cm^2

References:

[1] Wakeford, Hannah R., et al. “High temperature condensate clouds

in super-hot Jupiter atmospheres.” Monthly Notices of the Royal Astronomical Society (2016): stw2639.

[2] Virga: natashabatalha/virga

Moran et al. 2025 https://ui.adsabs.harvard.edu/abs/2025ApJ…994..116M/abstract

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_caal12o19(temp, p, metallicity=0)

Compute vapor pressure curve for CaAl12O19.

Args:

temp: float or ndarray

Temperature (K)

p: float

Pressure (dyne/cm^2)

metallicity: float

Metallicity relative to solar in log10 units (default: 0 = 1X solar)

Returns:

float or ndarray

Vapor pressure in dyne/cm^2

References:

[1] Wakeford, Hannah R., et al. “High temperature condensate clouds

in super-hot Jupiter atmospheres.” Monthly Notices of the Royal Astronomical Society (2016): stw2639.

[2] Virga: natashabatalha/virga

Moran et al. 2025 https://ui.adsabs.harvard.edu/abs/2025ApJ…994..116M/abstract

petitRADTRANS.chemistry.vapour_pressures.vapour_pressure_sio2(temp, metallicity=0)

Compute vapor pressure curve for SiO2.

Args:

temp: float or ndarray

Temperature (K)

metallicity: float

Metallicity relative to solar in log10 units (default: 0 = 1X solar)

Returns:

float or ndarray

Vapor pressure in dyne/cm^2

References:

[1] Virga: natashabatalha/virga

Moran et al. 2025 https://ui.adsabs.harvard.edu/abs/2025ApJ…994..116M/abstract

Notes:

PLACEHOLDER: Not suited yet for public use.