20th Cambridge Workshop: Cool Stars, Stellar Systems, and the Sun July 29 - Aug 3, 2018 Boston / Cambridge, USA Abstracts Connecting to the Boston University Network 1. Select network ”BU Guest (unencrypted)” 2. Once connected, open a web browser and try to navigate to a website. You should be redirected to https://safeconnect.bu.edu:9443 for registration. If the page does not automatically redirect, go to bu.edu to be brought to the login page. 3. Enter the login information: Guest Username: CoolStars20 Password: CoolStars20 Click to accept the conditions then log in. ii Foreword Our story starts on January 31, 1980 when a small group of about 50 astronomers came to- gether, organized by Andrea Dupree, to discuss the results from the new high-energy satel- lites IUE and Einstein. Called “Cool Stars, Stellar Systems, and the Sun,” the meeting empha- sized the solar stellar connection and focused discussion on “several topics … in which the similarity is manifest: the structures of chromospheres and coronae, stellar activity, and the phenomena of mass loss,” according to the preface of the resulting, “Special Report of the Smithsonian Astrophysical Observatory.” We could easily have chosen the same topics for this meeting. Over the summer of 1980, the group met again in Bonas, France and then back in Cambridge in 1981. Nearly 40 years on, I am comfortable saying these workshops have evolved to be the premier conference series for cool star research. Cool Stars has been held largely biennially, alternating between North America and Europe. Over that time, the field of stellar astro- physics has been upended several times, first by results from Hubble, then ROSAT, then Keck and other large aperture ground-based adaptive optics telescopes. The discovery of the first brown dwarfs and planets were both announced at Cool Stars 9. Later, Chandra, XMM-Newton and Spitzer and more recently Kepler and the Solar Dynamics Observatory repeatedly made us re-write text books—no really, the missions and meetings directly led to new editions. This year, as TESS and Parker Solar Probe threaten to make us re-write the text books yet again, approximately 500 international experts in Low-Mass Stars, Solar Physics, and Exoplanets meet here, in Boston and Cambridge, to again exchange ideas in a cross-disciplinary and friendly environment. I would like to thank all of you for coming and bringing your ideas and your willingness to share. This meeting is a celebration of you and the work you do. Four institutions in the Boston area (Boston University, Harvard-Smithsonian Center for As- trophysics (Harvard College Observatory / Smithsonian Astrophysical Observatory), MIT, and University of Massachusetts Lowell) jointly organized Cool Stars 20 at Boston University in Boston/Cambridge, MA from July 29 to August 4, 2018. I would like to thank the Scientific Organizing Committee who developed the science pro- gram. For this meeting the Scientific topics are: • Galactic Cartography in the Gaia Era, • Solar/Stellar Environments, • Fundamental Properties of Cool Stars, • Solar/Stellar Magnetic Fields and Surface Structure, • Very Low Mass (VLM) Objects. iii The Science Organizing Committee chose the invited speakers, the hosts of the splinter ses- sions, and the contributed speakers for the plenary session. Overall, we accepted only 37 contributed talks out of 289 submissions to speak in the plenary session. This means a speak- ing opportunity in the plenary session was about as difficult to obtain as Hubble time. I would like to thank the international SOC for their efforts: Silvia Alencar, Fabienne Bastien, Sarbani Basu, Chas Beichman, Svetlana Berdyugina, Angela Bragaglia, Paul Charbonneau, Ofer Co- hen, Charlie Conroy, Andrea Dupree, Catherine Espaillat, Gregory Feiden, Lindsey Glesener, Suzanne Hawley, Dave Huenemoerder, Gaitee Hussain, Moira Jardine, Adam Kowalski, Phil Muirhead, Jürgen Schmitt, John Stauffer, Gerard van Belle. They held up under the weight of so many difficult decisions. They have some more work to do choosing the best posters and the host for Cool Stars 21. Within the SOC, I especially want to thank Phil and Catherine for making the facilities at BU available to us. This meeting has grown to 10 times its original size and finding a large venue with enough room for all of us near the Center of the Universe (Cambridge, MA) is difficult. I would also like to thank Nancy Brickhouse and Ed DeLuca for helping me write the original proposal to help bring this meeting home and for graciously stepping aside from the SOC to allow more people to contribute. The hardest work organizing this meeting falls to the local organizing committee. They are drawn from the host institutions and have been working almost since the day we left Uppsala. Their tasks range from writing the web-based software, to organizing the excursions, dealing with the AV equipment, badges, designing T-shirts, coffee mugs, and pilsner glasses, creat- ing the abstract book and lining up the banquet. This is a bit more complicated than it was in 1980. Thanks go to Rana Ezzeddine, Moritz Günther (chair), Jenine Humber, Nishu Karna, Aurora Kesseli, David Principe, Sam Quinn, Benjamin Roulston, Carl Schmidt, Julie Skinner, Anastasiia V Uvarova, Mark Veyette, Jen Winters. Kristin Ann Divona created our logos. I especially want to thank Jenine our single administrator responsible for making sure every bill got paid, every visa question got answered and every invitation was sent. I also want to single out Moritz for thanks. He runs a very tight ship on the LOC, writes the really excellent software that drives the knowledge base of the meeting and he reminds me when I am falling behind schedule. I would also be remiss not to thank our sponsors, Charles Alcock at the Harvard-Smithsonian Center for Astrophysics, Gloria Waters at Boston University, Chas Beichman at NExSci and Fabio Favata at ESA; all made significant contributions which helped us keep the overall cost of the meeting down and in many cases allowed us to waive registration entirely. Finally, I would like to thank Andrea Dupree. Without her efforts in 1980 and throughout the 80’s, 90’s and 00’s, none of us would be here now for CS 20. She has been a tremendous source of encouragement and inspiration to me. Here is to seeing you all at Cool Stars 40 in 2058 or so. Scott Wolk Chair, Scientific Organizing Committee iv Code of Conduct & Contact Information Cool Stars 20 is dedicated to a harassment-free workshop experience for everyone regard- less of gender, gender identity and expression, sexual orientation, disability, physical appear- ance, body size, race, age, or religion. We do not tolerate harassment of workshop partici- pants in any form. A description of the full Code of Conduct can be found on the CS 20 website or at: http://coolstars20.cfa.harvard.edu/docs/CS20_code_of_conduct.pdf Reporting If someone makes you or anyone else feel unsafe or unwelcome, please report it as soon as possible. Conference staff can be identified by workshop t-shirts and colored name badges. Harassment and other code of conduct violations reduce the value of our event for everyone. Anonymous Report You can file an anonymous report using this form: https://goo.gl/forms/UXtcpH5kwjskcvU52 While we cannot follow up an anonymous report with you directly, we will fully investigate the incident and take whatever action is necessary to prevent a recurrence. Personal Report You can make a personal report by calling or messaging this number: (+1 781-819-3233) which will be continuously monitored by one member of the LOC for the duration of the event. When taking a personal report, our staff will ensure you are safe and cannot be overheard. They may involve other event staff to ensure your report is managed properly. You won’t be asked to confront anyone and we won’t tell anyone who you are. Contact Information Email address for organizers: [email protected] Note: this address is private and accessible to a limited number of organizing members. Phone number for conference security or organizers: Boston University Police Department: +1 617-353-5362 LOC Conduct Representatives: David Principe ([email protected]) and Julie Skinner ([email protected]) Local medical/police emergency number: 911 Local non-emergency medical (Beth Israel Deaconess Medical Center): +1 617-667-7000 Local law enforcement off-campus (Boston Police): +1 617-343-4500 Local sexual assault 24/7 hot line (Boston Area Rape Crisis Center): +1 800-841-8371 v vi Maps The maps on the following pages are meant to help you navigate the very local universe. The first shows the layout of the Boston University George Sherman Union, where the con- ference is held. The second shows the area immediately surrounding the George Sherman Union, and in- cludes some local dining options and the locations of the BU Dorms, the Hyatt, and the Mar- riot. Please note the pedestrian detour to navigate the area west of the GSU while Com- monwealth Avenue is under construction. Additional information (including interruptions for bikes, cars, and public transportation) about the Commonwealth Avenue Bridge Replace- ment can be found via MASSDOT: http://www.massdot.state.ma.us/highway/HighlightedProjects.aspx. If you have any other questions, please don’t hesitate to ask at Registration. vii Splinter Session B Session Splinter C Session Splinter & Coffee Posters & Coffee Posters Plenary Talks Talks Plenary A Session & Splinter Stairsto first floor 1 Metcalf Hall Metcalf 1 Auditorium 2 Lounge Terrace 3 Lounge Ziskind 4 Ballroom 5 Rooms Registration 4 GSU Layout GSU 1 5 2 3 Aug 4 Aug Hack Day Hack Saturday BBQ. Aug 3 Aug End of of End Friday Posters Plenary Plenary Coffee+ Place and conference time will be will time announced.