Data and code for: An Earth-sized transit candidate around the nearby M dwarf TOI-6284 and additional transit signals in three other TESS systems

Version 2 (2026-10-11) adds preregistered predictions, posted before the data they predict exist. TESS observes TOI-6284 again in Sectors 110 to 113, starting about 2026-10-31, and TOI-1692 from Sector 117, starting about May 2027. The file preregistration_package.zip contains:

• the predicted transit times with uncertainties (17 for TOI-6284, 5 for TOI-1692);
• the frozen ephemerides and transit shapes;
• the frozen test script, prereg_test.py;
• PREREGISTRATION.md, which fixes the PASS, FAIL and INCONCLUSIVE rules, the data products, when the test is run, and how amendments are handled.

SHA-256 checksums of every frozen file are listed in PREREGISTRATION.md. Every outcome will be reported here, including FAIL and INCONCLUSIVE. A PASS means the signal is recovered at the predicted times. It does not validate a planet. All version 1 files are unchanged.

Data products and analysis code for Brown (2026), submitted to The Astronomical Journal. The paper reports four new transit candidates found by searching TESS light curves of 4,698 hosts of pending TESS Objects of Interest: TOI-6284 (7.349 d, 1.03 Earth radii), TOI-7387 (3.145 d), TOI-1692 (85.93 d) and TOI-4566 (50.32 or 100.64 d). Included: search code, per-candidate vetting notes, TRICERATOPS runs, the list of rejected leads with reasons, transit-fit code (batman + emcee), posterior chains, and the detrended light curves used in the fits. All TESS data are public at MAST. Analysis code was written and run by AI agents (Anthropic Claude) under the author’s direction.