CONAN.utils.cosine_atm_variation

CONAN.utils.cosine_atm_variation#

CONAN.utils.cosine_atm_variation(phi, Fd=0, Fn=0, delta_deg=0, cosine_order=1)#

Calculate the phase curve of a planet approximated by a cosine function from Fmin to Fmax The equation is given as F = Fmin + (Fmax-Fmin)/2*(1-cos(phi + delta)). The semi-amplitude of the atmospheric phase variation is (Fmax-Fmin)/2, phi is the phase angle of the planet (true anomaly+omega-pi/2) in radians, and delta is the hotspot offset (in radians). Fday and Fnight are obtained as the value of F at phi=pi and 0 respectively.

Parameters:

  • phi (array-like) – phase angle (2*pi*phase for circular orbit) or true anomaly+omega-pi/2 in radians.

  • Fd (float) – Dayside flux/occultation depth

  • Fn (float) – night side flux

  • delta_deg (float) – hotspot offset in degrees. Positive values indicate eastward offset (peak before secondary eclipse).

  • cosine_order (float/int;) – order of the cosine function. Default is 1

Returns:

F – planetary flux as a function of phase

Return type:

array-like

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