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

Spherical Kepler orbits give shorter transits than the listed durations for TOI-4515 b and TOI-4914 b

We test whether two listed transit durations agree with the other parameters in the same source solutions. We use a frozen NASA Exoplanet Archive table, source tables, exact spherical Kepler contacts, public PyORBIT code, and TESS light curves. For TOI-4515 b and TOI-4914 b, the listed eccentric orbits give total durations of 2.6659 and 1.9740 hours. The source durations are 3.240 and 2.904 hours, or 21.5% and 47.1% larger. Conservative numerical bounds remain below the source duration ranges when each input varies through three listed error widths. These ranges have no assigned probability. A duration expression in two saved PyORBIT versions omits eccentric motion and gives 3.2461 and 2.9105 hours. Both source studies used PyORBIT with BATMAN. Local TESS shape fits give 2.6775–2.7064 and 1.8273–1.9084 hours across five choices of baseline and limb darkening. This evidence supports an error in a derived duration calculation. It does not establish the exact historical code version or an error in the main planet fits. The source check for TOI-4914 b uses arXiv version 1 and the matching archive row. The package preserves code, frozen inputs, source versions, hashes, numerical checks, results, and figures for an offline repeat.

transit duration · eccentric orbit · TOI-4515 b · TOI-4914 b · PyORBIT · TESS · NASA Exoplanet Archive · reproducibility · transit geometry

Admitted 1 citing publication

References

9
  1. uses76 of 2,447 NASA composite rows fail circular transit geometry within three listed error widths on 21 October 2026 sci:sha256:1a65a1ec12c37cd4fd9e23c9c539a4e31fd949eba568060ebd455b74f15bf9b9

    We extend its circular archive consistency question to eccentric orbits, individual source tables, public code expressions, and TESS light curves. We do not reuse its code or data.

  2. usesArchive scaled distances match semimajor axes in stellar radii within 10 percent for 82 of 83 selected eccentric planets sci:sha256:2329c4e8ebe3675309317e08538331667b10844345223558f0c7d253747a7d49

    Its check of archive scaled distances supports the semimajor axis interpretation. The two focal source tables also identify that quantity.

  3. usesdoi:10.26133/NEA12

    We preserve and analyze a Planetary Systems table query retrieved on 22 October 2026.

  4. challengesdoi:10.1051/0004-6361/202348207

    Table 3, 1p+GP, lists total and inner durations that exceed exact contacts for the listed eccentric orbit. The journal PDF and arXiv version 1 were checked. This claim is restricted to the derived durations.

  5. challengesdoi:10.1051/0004-6361/202451841

    The TOI-4914 b total duration in Table 6 of the associated arXiv version 1 and the matching archive row exceeds exact contacts for the listed eccentric orbit. The final journal table was not directly inspected. The claim is restricted to the derived duration.

  6. usesdoi:10.17909/t9-nmc8-f686

    Public two minute TESS SPOC PDCSAP light curves provide the local transit shape check.

  7. usesdoi:10.1086/683602

    BATMAN supplies exposure integrated transit shapes and an independent time domain contact check.

  8. usesdoi:10.1093/mnras/stt1435

    The local fits use the q1 and q2 coordinates for quadratic limb darkening.

  9. usesdoi:10.48550/arXiv.1001.2010

    Standard transit geometry defines projected separation and contact durations.

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