Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS - V. Discovery of two new DBV pulsators, WDJ152738.4−450207.4 and WD 1708−871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058−5234, and EC 04207−4748

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Fig. 16.

I − V (upper panel) and K − S (lower panel) significance tests to search for a constant period spacing in EC 20058. The tests are applied to the set of 11 pulsation periods of Table 11, that includes the TESS plus Sullivan et al. (2008)’s periods. Possible values of constant period spacing are marked with arrows in the upper panel.

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