Candidate stars in the T_eff–log g plane. The positions of the candidate sample are shown as green squares in the T_eff–log g plane. The known ZZ Ceti (Romero et al. 2022) and ELMVs (Hermes et al. 2012, 2013a,b; Kilic et al. 2015; Bell et al. 2015, 2017; Pelisoli et al. 2018a; Lopez et al. 2021) are shown as grey dots and purple diamonds, respectively. The ELMV found by Guidry et al. (2021) is not depicted since its atmospheric parameters have not been determined. The empirical ZZ Ceti instability strip published in Gianninas et al. (2015) is marked with dashed lines.