Bayesian Characterisation of Circumbinary Exoplanets with LISA - Faculté des Sciences de Sorbonne Université Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2022

Bayesian Characterisation of Circumbinary Exoplanets with LISA

Michael Katz
Camilla Danielski
Nikolaos Karnesis
  • Function : Author
Valeriya Korol
  • Function : Author
Nicola Tamanini
  • Function : Author
Neil Cornish
  • Function : Author
Tyson Littenberg
  • Function : Author


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.
Fichier principal
Vignette du fichier
stac2555.pdf (1.78 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-03677053 , version 1 (24-03-2023)



Michael Katz, Camilla Danielski, Nikolaos Karnesis, Valeriya Korol, Nicola Tamanini, et al.. Bayesian Characterisation of Circumbinary Exoplanets with LISA. Monthly Notices of the Royal Astronomical Society, 2022, 517 (1), pp.697-711. ⟨10.1093/mnras/stac2555⟩. ⟨hal-03677053⟩
16 View
0 Download



Gmail Facebook Twitter LinkedIn More