Bayesian characterization of circumbinary sub-stellar objects with LISA

Autor: Michael L Katz, Camilla Danielski, Nikolaos Karnesis, Valeriya Korol, Nicola Tamanini, Neil J Cornish, Tyson B Littenberg
Přispěvatelé: Ministerio de Ciencia e Innovación (España), European Commission
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Popis: The Laser Interferometer Space Antenna (LISA) will detect and characterize ∼104 Galactic Binaries, consisting predominantly of two white dwarfs (WDs). 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 substellar 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 behaviour 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. © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
VK acknowledges support from the Netherlands Research Council NWO (Rubicon 019.183EN.015 grant). NK acknowledges the support from the Gr-PRODEX 2019 funding program (PEA 4000132310). This research was supported in part through the computational resources and staff contributions provided for the Quest/Grail high-performance computing facility at Northwestern University. NT acknowledges support form the French space agency CNES in the framework of LISA. CD acknowledges financial support from the State Agency for Research of the Spanish MCIU through the ‘Center of Excellence Severo Ochoa’ award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709), and the Group project Ref. PID2019-110689RB-I00/AEI/10.13039/501100011033. This work was supported by the COST action CA16104 ‘Gravitational waves, black holes, and fundamental physics’ (GWverse) through a Short-Term Scientific Mission (STSM) awarded to CD (ID 48268) and VK (ID 48272). COST actions are supported by COST (European Cooperation in Science and Technology). NJC appreciates the support of the NASA LISA Foundation Science grant 80NSSC19K0320. This project has received financial support from the CNRS through the MITI interdisciplinary programs. This paper also employed the use of SCIPY (Jones et al. 2001) and MATPLOTLIB (Hunter 2007).
Databáze: OpenAIRE
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