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Journal Article

Bayesian Characterisation of Circumbinary Exoplanets with LISA


Katz,  Michael L.
Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Katz, M. L., Danielski, C., Karnesis, N., Korol, V., Tamanini, N., Cornish, N. J., et al. (2022). Bayesian Characterisation of Circumbinary Exoplanets with LISA. Monthly notices of the Royal Astronomical Society, 517 (1), 697-711. doi:10.1093/mnras/stac2555.

Cite as: https://hdl.handle.net/21.11116/0000-000A-8040-C
The Laser Interferometer Space Antenna (LISA) will detect and characterize

$\sim10^4$ Galactic Binaries consisting predominantly of two White Dwarfs (WD).

An interesting prospect within this population is a third object--another WD

star, a Circumbinary Exoplanet (CBP), or a Brown Dwarf (BD)--in orbit about the

inner WD pair. We present the first fully Bayesian detection and posterior

analysis of sub-stellar objects with LISA, focusing on the characterization of

CBPs. We used an optimistic astrophysically motivated catalogue of these CBP

third-body sources, including their orbital eccentricity around the inner

binary for the first time. We examined Bayesian Evidence computations for

detectability, as well as the effects on the posterior distributions for both

the inner binary parameters and the third-body parameters. We find that the

posterior behavior bifurcates based on whether the third-body period is above

or below half the observation time. Additionally, we find that undetectable

third-body sources can bias the inner binary parameters whether or not the

correct template is used. We used the information retrieved from the study of

the CBP population to make an initial conservative prediction for the number of

detectable BD systems in the original catalogue. We end with commentary on the

predicted qualitative effects on LISA global fitting and Galactic Binary

population analysis. The procedure used in this work is generic and can be

directly applied to other astrophysical effects expected within the Galactic

Binary population.