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Free keywords:
Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM, Astrophysics, Earth and Planetary Astrophysics, astro-ph.EP, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR,General Relativity and Quantum Cosmology, gr-qc
Abstract:
Gravitational waves have opened a new observational window through which some
of the most exotic objects in the Universe, as well as some of the secrets of
gravitation itself, can now be revealed. Among all these new discoveries, we
recently demonstrated [N. Tamanini & C. Danielski, Nat. Astron., 3(9), 858
(2019)] that space-based gravitational wave observations will have the
potential to detect a new population of massive circumbinary exoplanets
everywhere inside our Galaxy. In this essay we argue that these circumbinary
planetary systems can also be detected outside the Milky Way, in particular
within its satellite galaxies. Space-based gravitational wave observations
might thus constitute the mean to detect the first extra-galactic planetary
system, a target beyond the reach of standard electromagnetic searches.
