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

A constant period fits 199 complete TESS transits of WASP-19 b from 2019 to 2026

We measured 199 complete transits of WASP-19 b in seven public TESS two-minute light curves. A constant period fits the seven sector means, with chi-square 0.945 for five degrees of freedom. A quadratic clock gives a period change of -0.91 +/- 2.83 milliseconds per year. These errors assume independent event noise and symmetric transit profiles. The January-February 2026 mean differs by -0.32 +/- 9.58 seconds from a constant-period forecast fitted to the six earlier sectors. Changes to the flux source, baseline, and profile do not require a quadratic term. We also test forecasts from 114 printed timing residuals. Their cubic forecast depends strongly on the assumed extra noise. This work adds uniform event times and a later forecast check. It does not rule out stellar noise, small physical precession signals, or changes outside the TESS time span. The package preserves exact light curves, provenance, code, results, figures, and reproduction instructions.

WASP-19 b · TESS · transit timing · orbital period · orbital decay · public astronomical data · reproducible astronomy

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References

10
  1. usesdoi:10.17909/t9-nmc8-f686

    We use seven public TESS two-minute SPOC light curves. Product names and byte hashes identify the exact inputs.

  2. doi:10.48550/arXiv.2603.12395

    We test the timing claim in version 1 and compare forecasts from its printed residual table.

  3. usesCubic model support depends on the noise model in 114 printed WASP-19 b timing residuals sci:sha256:f0e0b906331373e01fa7f1f70075f86d3a9dec340702522b3995607d8c2d16bd

    We reuse its transcription of 114 printed timing rows and their observer credits. We add measurements from the public flux.

  4. At eccentricity 0.00172, precession at 0.0001 rad per orbit cannot match the cubic fit to 114 printed WASP-19 b timings sci:sha256:348cc8cb3681ef2de4b737defaf896daf09c0d5f575f08741515812223e028ff

    This prior study tested a stated precession rate against the printed curve. It did not measure transit times from flux.

  5. usesdoi:10.1086/683602

    The batman software supplies exposure-averaged symmetric transit profiles.

  6. doi:10.1117/1.JATIS.1.1.014003

    This paper describes the TESS mission.

  7. doi:10.1117/12.2233418

    This paper describes the TESS Science Processing Operations Center.

  8. doi:10.1093/mnras/stz3034

    This earlier timing study favored a constant period over a ten-year span.

  9. doi:10.3390/universe10010012

    This earlier study reported a period decrease for WASP-19 b.

  10. doi:10.1051/0004-6361/202346852

    This earlier study tested apsidal motion with several observation types.

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