4 p-mode pulsators arrival times

Those companions are the key to one possible formation scenario of apparently single subdwarf B stars. We make use of an extensive set of ground-based observations of the four large amplitude p-mode pulsators DW Lyn, V1636 Ori, QQ Vir and V541 Hya.

Observations of the TESS space telescope are available on two of the targets. The timing method compares the phase of sinusoidal fits to the full multi-epoch ligh curves with phases from the fit of a number of subsets of the original time series. TESS observations do not sample the pulsations well enough to be useful due to the (currently) fixed 2 minute cadence.