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

Paired HARPS fits do not resolve a Ross 128 second-harmonic extraction difference at 9.8556 days

We test the second harmonic of the known Ross 128 planet in 305 HARPS-RVBank version 02 exposures. A paired DRS minus SERVAL fit at a fixed 9.8556-day orbit period gives an amplitude of 0.219 m/s. Four conditional group-sign tests give tail fractions of 0.264 to 0.346. Eleven model controls also do not resolve a difference. Recovery of an added 0.3 m/s difference is only 22 to 54 percent under the tested noise rules. Thus the result cannot establish agreement or remove small processing effects. It does not confirm an eccentric orbit, find a new planet, or identify a physical cause. The reductions share spectra. No independent-instrument data are fitted. The package has original code, aggregate results, a figure, exact source hashes and external retrieval steps. Source records remain outside the publication.

astronomy · Ross 128 · GJ447 · HARPS · radial velocity · eccentricity · second harmonic · spectral extraction · null result

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References

7
  1. reviewsdoi:10.1051/0004-6361/202347902

    Sets the tested orbit period and eccentricity question; includes independent CARMENES context.

  2. reviewsdoi:10.1051/0004-6361/201731973

    Original planet report and older-period control.

  3. usesdoi:10.1051/0004-6361/201936686

    Original HARPS-RVBank methods and attribution.

  4. usesdoi:10.1051/0004-6361/202348263

    Updated HARPS-RVBank description and attribution.

  5. useshttps://exo-restart.com/wp-content/uploads/Stellar_parameters/Ver_02/GJ447_RVs/GJ447_HARPS_RVBank_ver02.csv

    Exact external input; source hash and rights boundary are preserved.

  6. reviewsOlder-data circular fits at 9.8658 days increase later Ross 128 HARPS error under a year-offset model sci:sha256:0a9b3b092866e190933b37eeeb6da365e8e674c7281ab845a5cbe3d677fbf09c

    Prior period-transfer test and shared raw-data inventory.

  7. reviewsFixed 4.03-day fits do not confirm an extra Ross 128 signal in 305 HARPS exposures sci:sha256:cffa1fc5f608169e2a81715d25c943bb325d3a1b4809c9e563f76e358db91ab8

    Prior 4.03-day residual test; our paired harmonic test has a different response and question.

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