Cool Stars 23 Splinter 6

Multiplicity of cool stars
and their evolution

Stellar Multiplicity

More than 20 percent of all stars exist in a multiple system, with the fraction increasing with mass to around 50 percent for main sequence solar-type stars. Multiplicity studies have advanced significantly since the early years of binary star research. Starting from identifying single systems, and crude descriptions of small samples, we have moved to detailed studies of multiplicity statistics and its dependency on mass, metallicity and its environment.

Multiplicity of cool stars has several implications on both stellar and planetary evolution. Some of these implications, that will be discussed in the session, are:

• - Formation of binaries and the subsequent planet formation
• - Dynamical effects of multiple systems and the orientation of the planetary orbits
• - Interactions in close binary systems
• - Direct measurements of stellar properties

Invited speakers

• Natalie Gosnell, Colorado College
• Kelly Hambleton, Villanova University
• Léa Planquart, Chalmers University of Technology
• Onno Pols, Radboud Universiteit
• John Southworth, Keele University

Discussion Session

At the end of the splinter there will be a session to discuss current and future challenges and issues in the field of Cool Stellar Multiplicity. Questions can be contributed online and/or anonymously using this Padlet LINK.

Organizers

• Matthew Swayne, University of Glasgow
• Ayush Moharana, Keele University
• Nikki Miller, Uppsala University
• José Caballero, Centro de Astrobiología, Madrid
• Krzysztof Hełminiak, CAMK, Toruń
• Thibault Merle, ULB and ROB, Bruxelles
• Valentin D. Ivanov, ESO Garching
• Leen Decin, KU Leuven
• Swetlana Hubrig, AIP, Postdam
• Orsola De Marco, Macquarie University
• Pierre Kervella, Observatoire de Paris
• Dorota Skowron, University of Warsaw
• Theo Khouri, Chalmers University