2024/09/12 by Fan Yang, Yang, Fan, R. J. Long +19 · 1 citation
Engineering · Physics and Astronomy · #Astronomy and Astrophysical Research #Earth and Planetary Astrophysics (astro-ph.EP) #FOS: Physical sciences #Solar and Stellar Astrophysics (astro-ph.SR) #Space Exploration and Technology #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.2409.07865
openalex publication_date 2024/09/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Hot Jupiters should initially form at considerable distances from host stars and subsequently migrate towards inner regions, supported directly by transit timing variation (TTV). We report the TTV of K2-237b, using reproduced timings fitted from Kepler K2 and TESS data. The timings span from 2016 to 2021, leading to an observational baseline of 5 years. The timing evolution presents a significant bias to a constant period scenario. The model evidence is evaluated utilizing the Bayesian Information Criterion (BIC), which favours the scenario of period decay with a ΔBIC of 14.1. The detected TTV induces a period decay rate (P) of -1.14±0.28×10-8 days per day (-0.36 s/year). Fitting the spectral energy distribution, we find infrared excess at the significance level of 1.5 σ for WISE W1 and W2 bands, and 2 σ level for W3 and W4 bands. This potentially reveals the existence of a stellar disk, consisting of hot dust at 800±300 K, showing a Ldust/L∗ of 5±3×10-3. We obtain a stellar age of 1.0+1.4-0.7×109 yr from isochrone fitting. The properties of K2-237b potentially serve as a direct observational support to the planet disk migration though more observation are needed.