Stellar effective temperature (T_eff) and Gaia DR3 G magnitude for the stellar-obliquity sample with stellar companions. Planet host stars and their corresponding stellar companions are shown as orange and blue dots, respectively. The gray lines connect each host–companion pair. The T_eff distributions of the two populations are shown in the right panel. Interestingly, in our stellar-obliquity sample (consisting of hot Jupiters), the planet host is always the more massive component of a binary.