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HajimeKawahara / exojax

🐈 Automatic differentiable spectrum modeling of exoplanets/brown dwarfs using JAX, compatible with NumPyro and JAXopt
http://secondearths.sakura.ne.jp/exojax/
MIT License
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High-resolution transmission line profile w/ inhomogeneity #96

Open HajimeKawahara opened 3 years ago

HajimeKawahara commented 3 years ago

I think we can model a high-R transmission line profile w/ a VMR inhomogeneity on a chord using exojax. These are just initial thoughts, should be divided into several separated issues:

  1. auto-differentiable transmission radiative transfer
  2. opacity computation of metal/atom lines, already raised in #17
  3. mapping over planet radial velocity distribution along a chord w/ a GP connection. A mapping technique might help this in the Bayesian context, hopefully.
  4. multiple phase fit, given a planet orbit

The number of lines is limited for this feature, even for a single line is fine. So, we can use the LPF, and even with multiple phase and velocity distribution on a chord, computation complexity is not extremely large for HMC-NUTS (honestly I just hope)

@astrostevanus

astrostevanus commented 3 years ago

That's very interesting, I will try it after I remove the Doppler shadow :)