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astro-ph.EP · Earth and Planetary Astrophysics

At fixed image inputs, bound ellipses for WASP-108 CC1 fit conditional 2013–2026 times with opposite 2026–2030 velocity changes

A circular model for WASP-108 CC1 predicts a positive host velocity change from 2026 to 2030. We test this forecast with elliptical orbits. We reuse 48 TESS times and one conditional historical aggregate epoch from 2013–2026. We keep the same nominal 2017 image position, distance, and masses. The model uses bound two-body ellipses, a constant intrinsic planet clock, and a changing light travel time. A saved ellipse has e = 0.800, a net velocity change of -25.0 m/s, and timing chi-square 42.173. Another gives almost zero change. A positive-change ellipse gives +197.5 m/s and chi-square 38.507. All pass the same descriptive cut of 43.021. The parent circular example gives +146.1 m/s and chi-square 39.021. The cut is not a probability interval. Independent state integration reproduces the analytic delays. The examples show that the forecast sign depends on the orbit assumption. They do not confirm association of CC1 or the cause of the historical timing difference. TESS alone fits a constant observed period. The package includes full states, copied input data, signed source provenance, code, figures, numerical checks, and reproduction instructions.

WASP-108 · transit timing · stellar companions · light travel time · eccentric orbits · radial velocity · orbit degeneracy · reproducible astronomy

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References

9
  1. usesA bound circular model for WASP-108 CC1 fits conditional 2013–2026 transit times with a constant planet period sci:sha256:9ea022f5f340c8b743bbab90b60878e2ad6662a26e2c938bc7a55347e5270065

    We retain its timing data, physical inputs, and circular comparison. We extend the assumed orbit to bound ellipses and test the sign of its future velocity forecast.

  2. usesA constant period fits 48 TESS transit times of WASP-108 b from 2019 to 2026 under the tested error models sci:sha256:e16b1f7870033eff5b9219fe66ac9f0b02c2f955889a62943d8f2d9ba93ffe1e

    Its 48 TESS times and conditional historical epoch enter through the signed circular parent package.

  3. Four recovered WASP-108 b discovery transits occur 2.7 min after TESS predictions with the assumed phase origin and time conversion sci:sha256:0ed26dac35c6e5e5e3ae827c4a04e86bfaf57c1b68127da2bab40de953f2fc6c

    Its discovery-curve recovery describes the remaining assumptions in the historical phase map and time conversion. We do not add those nights as independent data.

  4. usesdoi:10.1051/0004-6361/201937127

    It supplies the CC1 image position, nominal masses and distance, and ambiguous association status. We verify the relevant factual catalogue rows.

  5. usesdoi:10.3847/1538-4365/ac545b

    Its public tables supply the reference clock and historical aggregate epoch through the source package.

  6. doi:10.48550/arXiv.1410.3449

    The original discovery study provides historical context and the primary mass error used in a sensitivity test.

  7. doi:10.48550/arXiv.1006.3026

    It gives prior work on stellar companion light travel time in planet transit timing. The physical method is established.

  8. doi:10.3847/1538-3881/ac17f6

    The parent records its later I-band non-detection. We do not use the different-band contrast as an orbit constraint.

  9. usesdoi:10.17909/t9-nmc8-f686

    The derived transit times come from TESS light curves served by MAST. No new photon fits enter this study.

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