wlen_solution

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wlen_solution#

excalibuhr.utils.wlen_solution(fluxes, errs, w_init, transm_spec, order=2, p_range=[0.5, 0.05, 0.01], cont_smooth_len=101, debug=False)[source]#

Method for refining wavelength solution using a quadratic polynomial correction Poly(p0, p1, p2). The optimization is achieved by maximizing cross-correlation functions between the spectrum and a telluric transmission model on a order-by-order basis.

Parameters:

  • fluxes (array) – flux of observed spectrum in each spectral order

  • w_init (array) – initial wavelengths of each spectral order

  • p0_range (float) – the absolute range of the 0th polynomial coefficient

  • p1_range (float) – the absolute range of the 1th polynomial coefficient

  • p2_range (float) – the absolute range of the 2th polynomial coefficient

  • cont_smooth_len (int) – the window length used in the high-pass filter to remove the continuum of observed spectrum

  • debug (bool) – if True, print the best fit polynomial coefficients.

Returns:

wlens – the refined wavelength solution

Return type:

array

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