Detecting ultra-short period planets with gravitational waves

Possibly a new detection method?

Cunha, Silva & Lima "Gravitational Waves From Ultra Short Period Exoplanets"
https://arxiv.org/abs/1807.04877

The three systems noted as being potentially-detectable by space-based LISA (GP Comae Berenices, V396 Hydrae, and SDSS J143317.78+101123.3) are all substellar objects orbiting white dwarfs. Not sure whether or not they really count as planets, especially the ~57 Jupiter mass object around J1433.

Or maybe not... https://arxiv.org/abs/1808.07055