TESS Transit Timing of Hundreds of Hot Jupiters

TL;DR

This paper compiles a comprehensive database of transit times for 382 exoplanets observed by TESS, aiding follow-up studies and long-term period change analysis, with a focus on hot Jupiters.

Contribution

It provides the first extensive, publicly available database of transit timings and updated ephemerides for hundreds of exoplanets, including hot Jupiters, based on TESS data and literature.

Findings

WASP-12 shows a secure period change.

Detected a second transiting planet in NGTS-11.

Identified systems with suggestive evidence for period variations.

Abstract

We provide a database of transit times and updated ephemerides for 382 planets based on data from the NASA Transiting Exoplanet Survey Satellite (TESS) and previously reported transit times which were scraped from the literature in a semi-automated fashion. In total, our database contains 8,667 transit timing measurements for 382 systems. About 240 planets in the catalog are hot Jupiters (i.e. planets with mass $>$0.3$M_{\rm Jup}$ and period $<$10 days) that have been observed by TESS. The new ephemerides are useful for scheduling follow-up observations and searching for long-term period changes. WASP-12 remains the only system for which a period change is securely detected. We remark on other cases of interest, such as a few systems with suggestive (but not yet convincing) evidence for period changes, and the detection of a second transiting planet in the NGTS-11 system. The compilation of light curves, transit times, ephemerides, and timing residuals are made available online, along with the Python code that generated them (visit https://transit-timing.github.io).