On the possibility of detecting ultra-short period exoplanets with LISA

Abstract

Cunha et al. (2018) recently reexamined the possibility of detecting gravitational waves from exoplanets, claiming that three ultra-short period systems would be observable by LISA. We revisit their analysis and conclude that the currently known exoplanetary systems are unlikely to be detectable, even assuming a LISA observation time $T_{\mathrm{obs}}=4$ yrs. Conclusive statements on the detectability of one of these systems, GP Com b, will require better knowledge of the system's properties, as well as more careful modeling of both LISA's response and the galactic confusion noise. Still, the possibility of exoplanet detection with LISA is interesting enough to warrant further study, as gravitational waves could yield dynamical properties that are difficult to constrain with electromagnetic observations.

arXiv comment4 pages, 1 figure, 2 tables, revised in response to referee's comments and accepted in MNRAS

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• The Gravitational Wave Emission of Double White Dwarf Coalescences
• The Sound of Clearing the Throat: Gravitational Waves from a Black Hole Orbiting in a Wormhole Geometry
• Unveiling the architecture of a pulsar - binary black-hole triple system with pulsar arrival time analysis
• Astrophysics with the Laser Interferometer Space Antenna
• Detectability of continuous gravitational waves from planetary-mass companions orbiting compact stars