Will Gravitational Waves Discover the First Extra-Galactic Planetary System?
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.
Cite
@article{arxiv.2007.07010,
title = {Will Gravitational Waves Discover the First Extra-Galactic Planetary System?},
author = {Camilla Danielski and Nicola Tamanini},
journal= {arXiv preprint arXiv:2007.07010},
year = {2021}
}
Comments
Essay received an honorable mention in the Gravity Research Foundation 2020 Awards for Essays on Gravitation; Accepted for publication in Int. J. Mod. Phys. D; 3 pages, 1 figure