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Will Gravitational Waves Discover the First Extra-Galactic Planetary System?

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Tamanini,  Nicola
Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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2007.07010.pdf
(Preprint), 341KB

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Citation

Danielski, C., & Tamanini, N. (2020). Will Gravitational Waves Discover the First Extra-Galactic Planetary System? International Journal of Modern Physics D, 2043007. doi:10.1142/S0218271820430075.


Cite as: http://hdl.handle.net/21.11116/0000-0007-7834-8
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.