Cool Stars 20.5 - virtually cool on March 2-4 2021

in Memory of John Stauffer

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 ongoing pandemic, the organizers of Cool Stars 21 consider it unlikely we will be able to meet in person in the summer of 2021. This would put a four year gap between our meetings for the first time. Therefore we have decided to hold a virtual conference to keep everyone in our field up to date. But don't worry, we still plan to meet in Toulouse in mid-2022.

SOC and LOC plan the following important dates:
  • Jan 8, 2021: Deadline for abstracts for an oral contribution (talk or poster with haiku)
  • Feb 12, 2021: Speakers announced
  • Feb 19, 2021: Deadline to suggest a topical interest room
  • Feb 26, 2021: Posters uploaded to Zenodo
  • Feb 26, 2021: Prerecorded haikus submitted to LOC
  • March 2-4, 2021: Virtual meeting
  • May 11, 2021: Deadline for proceedings / ingest into ADS
  • July 4, 2022: Cool Stars 21! Live and in person!

What is "Cool Stars"?

The Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun ("Cool Stars") has been running for 40 years. The first workshop was held in Cambridge, Massachusetts in 1980. Since then, Cool Stars has been held largely biennially, alternating between North America and Europe, where approximately 400 international experts in Low-Mass Stars, Solar Physics, and Exoplanets meet to exchange ideas in a cross-disciplinary and friendly environment.

General overview of the conference’s format

The conference will take place during the week of March 2-4, 2021. We have adopted a virtual format that allows for general discussions of the state of the field while also providing an opportunity for everybody to present their work. Registration is required, but will be free of charge. We have selected a time range for the main synchronous activities (including review talks, Q&A, and discussion sessions) that maximizes the number of attendees based on previous meetings. We apologize for not being able to accommodate all different time zones, but all live activities will be recorded and made available afterward for people who cannot join them.

Daily synchronous sessions via a Zoom webinar. These sessions will be 3 - 4 hours long (with breaks), and will be held from ~17:00 to 20:00/21:00 UTC. The webinars will be recorded, and uploaded to Youtube. These sessions will consist of:

  • Invited review talks (about 25 minutes). Short Q&As using the chair to moderate questions from the chat.
  • Several poster Haiku* sessions in between the talks
  • Live contributed talks with Short Q&As
  • Posters (some of which will be eligible for Haiku*),
*: haïku (俳句, haiku) is an extremely brief little poem aimed at saying and celebrating the evanescence of things. In the context of the meeting we mean a 1 minute/1 slide presentation of your work.

A Slack space may be used to host asynchronous discussion during the conference, including questions or topics that could not be covered during the webinars, Q&As for contributed talks or posters, and other general or specific discussions.


To contact the SOC or LOC write to: (yes, we are re-using the email address from CS 20)

  • Silvia Alencar - Federal University of Minas Gerais
  • Myriam Benisty - Institut de Planétologie et d'Astrophysique de Grenoble
  • Jérôme Bouvier (CS 21 co-chair) - Institut de Planétologie et d'Astrophysique de Grenoble
  • Allan Sacha Brun (CS 21 chair) - CEA Saclay
  • Corinne Charbonnel - Geneva Observatory
  • Marc DeRosa - Lockheed Martin Solar and Astrophysics Laboratory
  • Andrea Dupree - Center for Astrophysics | Harvard & Smithsonian
  • 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 - 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 (SOC 20.5 co-chair) - Center for Astrophysics | Harvard & Smithsonian


To contact the SOC or LOC write to: (yes, we are re-using the email address from CS 20)

  • James R. A. Davenport - University of Washington
  • Shaun Gallagher - Center for Astrophysics | Harvard & Smithsonian
  • Moritz Günther (chair) - MIT
  • Scott Wolk - Center for Astrophysics | Harvard & Smithsonian

Organizing Institutions

Code of Conduct

The Cool Stars 20.5 organizers are committed to making this meeting productive and enjoyable for everyone, regardless of gender, sexual orientation, disability, physical appearance, body size, ethnicity, nationality, or religion. We will not tolerate harassment of participants in any form. Please follow these guidelines, even if we meet virtually:

  • Behave professionally. Harassment and sexist, racist, or exclusionary comments or jokes are not appropriate. Harassment includes sustained disruption of talks or other events, inappropriate or unwelcome physical contact, sexual attention or innuendo, deliberate intimidation, stalking. It also includes offensive comments related to gender, sexual orientation, age, disability, physical appearance, body size, ethnicity, or religion.
  • All communication should be appropriate for a professional audience of people from many different backgrounds. Sexual language and imagery is not appropriate.
  • Be kind to others. Do not insult or put down other attendees.

Participants asked to stop any inappropriate behaviour are expected to comply immediately. Attendees violating these rules may be asked to leave the event at the sole discretion of the organizers.

This code of conduct was originally designed for an astronomy conference in London, adapted by Andrew Pontzen and Hiranya Peiris from a document by Software Carpentry, which itself derives from original Creative Commons documents by PyCon and Geek Feminism.


  • Artwork: Kristin Ann Divona
  • Website template design by Veselka for
  • Website development on github
  • GAIA all sky image on front page: ESA/Gaia/DPAC, CC BY-SA 3.0 IGO

Previous (and future!) Meetings