4-9 July 2022, 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.

With the still ongoing COVID-19 pandemics it is now clear that it is best to postpone once more the organization of CS21. The SOC took the difficult decision to postpone the conference until 2022. We now have a new date and will be delighted to welcome you for CoolStars21 in Toulouse in 2022, from the 4th to the 9th of July! Please join the pre-registered mailing list if you wish to have news and updates about the conference.

The CS21 SOC also decided, due to the long gap between CS20 and CS21, to organize a 3-day remote conference, named CoolStars20.5, because so much exciting science has emerged since CS20. The CS20.5 virtual meeting will be our next meeting point on March 2-4 2021, until we meet (in-person) at CS21 in Toulouse in 2022. Abstract submission for CS20.5 is now open, please visit the web site!


What is "Cool Stars"?

The next (physical) edition of the conference series "Cool Stars, Stellar Systems and the Sun" (CS 21) will be held in Toulouse from July 4 to 9 2022, 42 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
  • Anaïs Bertranuc - Insight Outside
  • 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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