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astro-ph.EP · Earth and Planetary Astrophysics

A bound circular model for WASP-108 CC1 fits conditional 2013–2026 transit times with a constant planet period

We test if light travel time from the imaged candidate WASP-108 CC1 can fit a conditional transit timing curve with a constant intrinsic planet period. We reuse 48 TESS transit times from 2019–2026 and one historical aggregate reference epoch from a signed SCI study. We assume that CC1 is bound and use the published nominal 2017 separation, distance, and masses. An exact circular two-body orbit gives chi-square 39.02 for 49 timing records; a quadratic clock gives 38.31 and a linear observed clock gives 72.71. The example orbit has radius 37.66 AU and period 187.67 years. The 2017 instantaneous acceleration bound does not exclude this time-dependent fit. The example predicts a host radial velocity increase of 146.1 m/s from 2026 to 2030. A saved orbit grid gives ranges for future velocity and relative position tests. These ranges hold the image inputs fixed and are not probability intervals. TESS alone fits a constant observed period. Added shared timing errors also remove the need for curvature. The result shows a possible physical explanation under the tested assumptions. It does not confirm that CC1 is bound or caused the timing curve. The package includes source records, copied timing inputs, code, figures, fit results, error tests, and independent numerical checks.

WASP-108 · transit timing · light travel time · stellar companions · TESS · radial velocity · orbit feasibility · reproducible astronomy

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References

8
  1. usesA constant period fits 48 TESS transit times of WASP-108 b from 2019 to 2026 under the tested error models sci:sha256:e16b1f7870033eff5b9219fe66ac9f0b02c2f955889a62943d8f2d9ba93ffe1e

    We reuse its 48 TESS times, alternative timing tables, and conditional historical epoch. We test a circular companion light delay and give forecasts.

  2. usesdoi:10.1051/0004-6361/201937127

    Tables 1 and 2 supply the distance, masses, image date, CC1 separation, position angle, contrast, and ambiguous association status.

  3. usesdoi:10.3847/1538-4365/ac545b

    The reference clock and historical aggregate epoch come from its public tables through the parent SCI package.

  4. usesdoi:10.48550/arXiv.1410.3449

    The discovery study gives the original epoch labels and the primary mass error used in an input test.

  5. usesdoi:10.3847/1538-3881/ac17f6

    Table 7 gives a later I-band non-detection and contrast limits. We assess its scope but do not fit it as an orbit constraint.

  6. doi:10.1093/mnras/stz2620

    Prior transit timing work treats companion light travel time as a cause of apparent period change.

  7. usesdoi:10.1051/0004-6361/201321714

    Appendix A gives the standard maximum line-of-sight acceleration for a fixed projected separation and companion mass.

  8. usesdoi:10.17909/t9-nmc8-f686

    The parent timing measurements use TESS data from this collection. We use its derived times, not a new fit to the photons.

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