Top: irradiation history of KELT-23Ab modeled for a range of stellar tidal quality factors, ﹩{Q}_{* }^{{\prime} }﹩. KELT-23Ab is shown to be above the inflation irradiation threshold (2 × 108 erg s−1 cm−2; Demory & Seager 2011) throughout its history. Bottom: change in semimajor axis of KELT-23Ab over time modeled from several ﹩{Q}_{* }^{{\prime} }﹩ values