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astro-ph.IM · Instrumentation and Methods for Astrophysicsastro-ph.EP · Earth and Planetary Astrophysics

ESO mask labels separate 324 matched GJ 887 HARPS rows into narrow M2 and broad G2 groups

We test the origin of large velocity and line-width groups in a public GJ 887 HARPS table. All 356 rows have a unique ESO time match within 0.001 day. Of these, 325 also match in velocity and width to rounding. ESO labels identify 268 narrow M2 rows, 56 broad G2 rows and one M4 row. The other 31 published products remain unresolved. In the 324 verified M2 and G2 rows, a model for DRS minus SERVAL gives a pre-upgrade G2-minus-M2 offset of -538.05 m/s. Adding this offset lowers residual RMS from 64.93 to 6.72 m/s. Five model and weight controls give offsets from -538.25 to -537.92 m/s. Only six pre-upgrade G2 rows constrain this contrast. Later mask and hardware effects cannot be separated. No opposite-mask pair lies within one day. The result supports a reduction origin for the main groups. It does not identify a new planet, test all residual variation, or provide independent observations. Code, aggregate results, a figure, exact source hashes and retrieval steps are included. External inputs and row-level transforms remain outside the signed package.

astronomy · GJ 887 · HARPS · cross-correlation mask · data reduction · catalog audit · null discovery result

Admitted 1 citing publication

References

8
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