22 - 26 June 2020, Toulouse, France

The "Cambridge Workshops of Cool Stars, Stellar Systems and the Sun" are held biennially and have evolved to be the premier conference series for cool star research.

SOC and LOC plan the following important dates:
  • Early October 2019: call for splinter sessions
  • 9 December 2019: deadline for submission of splinter sessions
  • 15 January 2020: announcement of selected splinter sessions
  • January 2020: registration opens (early bird fees)
  • January 2020: opening of abstract submission to main conference and splinters
  • Early February 2020: deadline for travel grant support request
  • Early March 2020: abstract submission deadline
  • Mid March 2020: normal registration fee
  • Mid March 2020: announcement of program and selected grantees
  • Early May 2020: late registration fee

What is "Cool Stars"?

The next edition of the conference series "Cool Stars, Stellar Systems and the Sun" (CS 21) will be held in Toulouse from June 22 to 26, 2020, 40 years after its first edition in Cambridge (USA). This first edition was shortly followed that same year by a workshop on "Solar Phenomena in Stars and Stellar Systems" that took place in the southern French countryside, in a small village called Bonas. Both meetings are often considered as the starting point of this exceptionally successful conference series, where approximately 400 international experts in Low-Mass Stars, Solar Physics, and Exoplanets meet every other year to exchange ideas in a cross-disciplinary and friendly environment. Bonas is certainly not adapted anymore to host what became a major conference, but we will have CS 21 a stone throw away from there in Toulouse, where attendees will enjoy a certain lifestyle that - fortunately - has not change over the last forty years!


To contact the SOC or LOC write to:

  • Silvia Alencar - Federal University of Minas Gerais
  • Myriam Benisty - Institut de Planétologie et d'Astrophysique de Grenoble
  • Jérôme Bouvier (SOC co-chair) - Institut de Planétologie et d'Astrophysique de Grenoble
  • Allan Sacha Brun (SOC chair) - CEA Saclay
  • Corinne Charbonnel - Geneva Observatory
  • Marc DeRosa - Lockheed Martin Solar and Astrophysics Laboratory
  • Andrea Dupree - Harvard-Smithsonian Center for Astrophysics
  • Luca Fossati - Austrian Academy of Sciences
  • Laurent Gizon - Max Planck Institute for Solar System Research
  • Gregory Herczeg - KIAA / Peking University
  • Lynne Hillenbrand - California Institute of Technology
  • Miho Janvier - IAS / University of Paris-Sud
  • Moira Jardine - University of Saint Andrews
  • Carme Jordi - University of Barcelona
  • Elena Khomenko - Instituto de Astrofísica de Canarias
  • Heidi Korhonen - European Southern Observatory
  • Ágnes Kóspál - Konkoly Observatory
  • Sean Matt - University of Exeter
  • Pascal Petit (LOC chair) - Institut de Recherche en Astrophysique et Planétologie
  • Sofia Randich - INAF / Arcetri Astrophysical Observatory
  • Rachael Roettenbacher - Yale University
  • Alexis Rouillard - Institut de Recherche en Astrophysique et Planétologie
  • Klaus Strassmeier - Leibniz-Institut für Astrophysik Potsdam
  • Takeru Suzuki - University of Tokyo
  • Adriana Valio - Mackenzie Presbyterian University
  • Scott Wolk - Harvard-Smithsonian Center for Astrophysics


To contact the SOC or LOC write to:

  • Jérôme Ballot - Institut de Recherche en Astrophysique et Planétologie (IRAP)
  • Clément Baruteau - IRAP
  • Florian Debras - IRAP
  • Sébastien Deheuvels - IRAP
  • Dolorès Granat - IRAP
  • Léa Griton - IRAP
  • Laurène Jouve - IRAP
  • Soizic Peron - Insight Outside
  • Pascal Petit (LOC chair) - IRAP
  • Nicolas Poirier - IRAP
  • Victor Reville - IRAP
  • Alexis Rouillard - IRAP

Organizing Institutions



  • Artwork: CNES (service multimedia)
  • Website template design by Veselka for
  • Website development based on CS20's website source code on github

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