[Temperature]

This header is used to define temperature profiles for the atmosphere. The type of temperature profile is defined by the profile_type variable

The available profile_type are:

• isothermal

  • Isothermal temperature profile

  • Class: Isothermal

• guillot2010

  • TP profile from Guillot 2010, A&A, 520, A27

  • Class: Guillot2010

• npoint

  • N-point temperature profile

  • Class: NPoint

• rodgers

  • Layer-by-layer temperature - pressure profile

  • Class: Rodgers2000

• file

  • Temperature profile from file

  • Class: TemperatureFile

• custom

  • User-type temperature. See Custom Types

More profiles can also be included using Plugins

---

Isothermal Profile

profile_type = isothermal

Constant temperature throughout atmosphere

Keywords

Variable	Type	Description	Default
T	float	Temperature in Kelvin	1500

Fitting Parameters

Parameter	Type	Description
T	float	Temperature in Kelvin

Examples

Example isothermal profile:

[Temperature]
profile_type = isothermal
T = 1500

---

Guillot 2010 Profile

profile_type = guillot

TP profile from Guillot 2010, A&A, 520, A27 (equation 49) Using modified 2stream approx. from Line et al. 2012, ApJ, 749,93 (equation 19)

Keywords

Variable	Type	Description	Default
T_irr	float	Planet equilibrium temperature (K)	1500
kappa_ir	float	mean infra-red opacity	0.01
kappa_v1	float	mean optical opacity one	0.005
kappa_v2	float	mean optical opacity two	0.005
alpha	float	ratio between kappa_v1 and kappa_v2	0.5

Fitting Parameters

Parameter	Type	Description
T_irr	float	Planet equilibrium temperature (K)
kappa_ir	float	mean infra-red opacity
kappa_v1	float	mean optical opacity one
kappa_v2	float	mean optical opacity two
alpha	float	ratio between kappa_v1 and kappa_v2

Examples

Example Guillot profile:

[Temperature]
profile_type = guillot
T_irr = 1500
kappa_ir = 0.01
kappa_v1 = 0.002
kappa_v2 = 0.003
alpha = 0.3

---

N-Point Profile

profile_type = npoint

Temperature defined at various heights in the atmosphere. Smoothing is then applied. If no temperature and pressure points are defined, it is equivalent to a 2-point profile. Including 1 makes it a 3-point and so on. Each temperature point must have an associated pressure point and vica versa.

Keywords

Variable	Type	Description	Default
T_surface	float	Temperature at P_surface in K	1500
T_top	float	Temperature at P_top in K	200
P_surface	float	Pressure at T_surface in Pa. Set to -1 for BOA	-1
P_top	float	Pressure at T_top in Pa. Set to -1 for TOA	-1
temperature_points	list	Temperature points between BOA and TOA
pressure_points	list	Pressure in Pa for each temperature point
smoothing_window	int	Smoothing width	10

Fitting Parameters

Fitting parameters are generated for each temperature_point and pressure_point defined. They start from 1 and have the form T_point1, P_point1, T_point2, P_point2 etc.

Variable	Type	Description
T_surface	float	Temperature at P_surface in K
T_top	float	Temperature at P_top in K
P_surface	float	Pressure at T_surface in Pa.
P_top	float	Pressure at T_top in Pa.
T_point(n)	float	Temperature point (n). Starts from 1
P_point(n)	float	Pressure point (n). Starts from 1

---

Rodgers 2000 Profile

profile_type = rodgers

Layer-by-layer temperature - pressure profile retrieval using dampening factor Introduced in Rodgers (2000): Inverse Methods for Atmospheric Sounding (equation 3.26)

Keywords

Variable	Type	Description	Default
temperature_layers	list	Temperature in Kelvin for each layer	None
correlation_length	float	Correlation length	5.0

Fitting Parameters

Warning

For a 100 layer atmosphere, this will create 100 fitting parameters for T_(n) which might be very unwieldly to use and fitting them all could lead to a very long sample time.

Parameter	Type	Description
T_(n)	float	Temperature for layer (n)
corr_length	float	Correlation length

---

Temperature File

profile_type = file

Reads a text file. Can support multi column files with any units

If a pressure column is provided then it will interpolate the temperature based on the pressure. If no pressure is provided then it will assume index 0 is BOA and the last index is TOA and interpolate according to that.

Keywords

Variable	Type	Description	Default
filename	str	Path to temperature file	None
skiprows	int	No. of rows to ignore	0
temp_col	int	Column number of temperature (0-based)	0
press_col	int	Column number of pressure if available (0-based)	None
temp_units	str	Units of temperature (based on astropy format)	K
press_units	str	Units of pressure (based on astropy format)	Pa
delimiter	str	Delimiter used in file. None means whitespace	None
reverse	bool	False = BOA-TOA, True = TOA-BOA	None