Objective of the WP

The objectives of this WP are:

To find out how to get accurate matches between observed and theoretical frequencies computed for the PLATO pipelines
To find the right oscillation code for the theoretical frequencies computation
Provide a version of the code to be used in the pipeline

Current frequency precision (2019)
0.1 μHz (around υ_max)

ESTA/CoRoT (2008) Precision results

Summary of the oscillation frequency comparison results biblio [1] using the codes: ADIPLS, FILOU, NOSC, LOSC, GRACO, OSCROX, PULSE, POSC and LNAWENR.

Conclusions	Comment
1	4K yields 0.02μHz precision, 2K yields 0.5 μHz precision (in average).
2	2K does not properly distribute mesh points in the boundaries of the BV, 4K has no those problems
3	O(2)+Richardson Extrapolation indistinguishable from O(4) neither for 4K nor for 2K
4	r or r/P as integration variable may introduce errors if G is not consistent
5	Eulerian P / Lagrangian P as eigenfunction (modifies BV frequency, euP). May have an impact if thermodynamical quantities are not internally consistent (e.g. OPAL tables)
6	2K not adequate for large/small separations. 4K yields frequency differences below obs precision
7	Proper sampled BV is key to avoid numerical bias. 4K partially overcome the problem
8	G constant inconsistencies affect the frequencies comparison (up to 0.3-0.4 μHz !). Should be taken from the model