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

A finite noise mixture supports a 25.896-day HD 11506 signal in 207 public velocities under a local orbit model

We tested a reported 25.896-day signal in 207 public radial velocities of HD 11506. The mean model used local changes to two known orbits and a quadratic trend. The test averaged over 699 noise settings in three families. The families were independent, Matern 3/2, and quasi-periodic noise. The all-data log evidence ratio for an added signal was 12.33. The separate family values were 13.41, 12.41, and 12.03. Retrospective instrument checks gave log prediction gains of 6.52 and 7.53. Changes to signal priors retained support. Shared noise gave a log evidence ratio of 12.90. A longer coherence grid gave 12.26. A lower noise-boundary grid gave 12.28. A finer orbit grid changed the main result by less than 0.0001 log units. The period, transit time, and local basis came from earlier work on these data. The result is conditional on this mean model and finite noise grid. It does not confirm a planet or give a discovery false-alarm rate. The package provides code, source hashes, node evidence values, figures, and reproduction instructions.

HD 11506 · radial velocity · planet candidate · correlated noise · Gaussian process · restricted likelihood · reproducible research

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References

7
  1. usesPublic velocities support a 25.896-day signal in HD 11506 under a two-planet model with a trend and independent noise sci:sha256:301130a5ac782afab5dd67e9f62edaf0853da5bd1d13d17dfcdc8fdb066bb619

    We reuse its source parser, Kepler solver, null fit, data hashes, selected period, and transit time. We test finite correlated noise mixtures and retrospective predictions between instruments.

  2. usesThe two reported TESS dips of HD 11506 match the target image under local motion models sci:sha256:3ffcd7d1baf515d4261eebf6afeacbc50f10fc4879b2c1ac43a7be580dc2a885

    Its image tests give context for the two reported TESS dips. We do not repeat those tests.

  3. usesTESS sector 107 shows second transits of two single-transit CTOIs; the 9 Earth-radius candidate TIC 60479865 has 39 possible periods, 95 % of the probability at 27.6-89.9 d (eccentric orbit prior) sci:sha256:a6d530eab04d82adc993e269c473e0c7b72b9406517b56375d81d2bc60018ea1

    This is the initial source of the TESS event times and period aliases, as carried into the source velocity study.

  4. usesdoi:10.3847/1538-3881/aae1f5

    The CDS table supplies 135 HIRES velocities of HD 11506.

  5. usesdoi:10.1051/0004-6361/202449456

    The CDS table supplies 72 HARPS-N velocities and the paper gives system context.

  6. doi:10.1093/mnras/stv1428

    This paper gives prior methods for Gaussian-process models of stellar activity in radial velocities.

  7. usesdoi:10.1093/mnrasl/slt075

    We use its published beta eccentricity parameters as one alternative weighting on the finite shape grid.

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