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California-Planet-Search / grandsol

Grand Solution - Doppler forward modeling
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Search for correlations of velocity with environmental parameters #48

Closed bjfultn closed 7 years ago

bjfultn commented 7 years ago

Use rvdecorr.py to search for correlations with environmental parameters.

bjfultn commented 7 years ago

If I look at all of the 10700 APF observations with reasonable SNR. The strongest correlations (Spearman-rank test ~ 0.1) are actually with the SNR itself. Parameters like the exposure meter counts, and velocity uncertainties from the CPS pipeline are most strongly correlated with the iGrand velocities.

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bjfultn commented 7 years ago

If I restrict the observations to only those taken with approximately the same SNR (phocount ~ 1.0e9) then the strongest correlations are with the wavelength node positions. These are actually stronger (Spearman-rank ~0.2) then the SNR correlations.

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bjfultn commented 7 years ago

There are also correlations with the barycentric correction at about the same level as the wavelength shift correlations. I'm still restricting the SNR to a narrow range here.

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bjfultn commented 7 years ago

Of course, the strongest correlations in either the restricted dataset or the full dataset is with the CPS velocity itself. This is actually pretty interesting...

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bjfultn commented 7 years ago

Wavelength node position vs. observation index

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bjfultn commented 7 years ago

Make plot vs. observation index and wavelength vs. observation index.

bjfultn commented 7 years ago

Superseded by issue #55