Development of models for nearby young stellar moving groups: creation, revision, and finalisation of the models

Abstract

Lee & Song (2018, Paper 1) developed a tool for calculating Bayesian membership probability for nearby young stellar moving groups (BAMG: Bayesian Analysis of Moving Groups). The study presented the importance of careful construction of models in moving group membership assessment, using $\beta$ Pictoris moving group as a test case. In this study, we build models for all major nearby young stellar moving groups (NYMGs hereafter) through 4 stages. A set of prototype models is created using members listed in the discovery paper of each group. For each group, suggested members after the discovery of the group are used for revising these prototype models. As these additional members being incorporated, group properties of a NYMG changes, thus membership probabilities change as well. A subset of stars show consistently large membership probabilities regardless of the details of a chosen method for ingesting additional members. Utilising these members, the NYMG models are finalised. The finalised models are applied for evaluating memberships of all claimed candidate members, resulting in a list of bona fide members. The mass function of bona fide members for the entire set of NYMG members indicates that more late-M type members should be identified. In addition, some objects showing a large difference in membership probability between BAMG and BANYAN $\Sigma$ (Gagne et al. 2018b) are presented and discussed. Memberships of some planet host stars are changed, and it can have a significant influence on the estimated planetary masses.

27 pages, accepted for publication in MNRAS

References in corpus (5)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Gas expulsion and the destruction of massive young clusters
• The nearest young moving groups
• BANYAN. IV. Fundamental parameters of low-mass star candidates in nearby young stellar kinematic groups - Isochronal Age determination using Magnetic evolutionary models
• BANYAN. X. Discovery of a wide, low-gravity L-type companion to a fast-rotating M3 dwarf

Cited by in corpus (7)

• A detailed characterization of HR 8799's debris disk with ALMA in Band 7
• Addressing Systematics in the Traceback Age of the $\beta$ Pictoris Moving Group
• The Age of the Carina Young Association and Potential Membership of HD 95086
• Gaia-based Isochronal, Kinematic, and Spatial Analysis of the $\epsilon$ Cha Association
• Dynamical Mass of the Young Brown Dwarf Companion PZ Tel B
• Low-mass members of nearby young stellar moving groups from Gaia EDR3
• 2MASS J04435686+3723033 B: A Young Companion at the Substellar Boundary with Potential Membership in the $\beta$ Pictoris Moving Group