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The Exoplanets Conference Series

How a conference series was born out of frustration with the old guard, with a renewed emphasis on youth, women and community-based exoplanet science

Go to the profile of Kevin Heng
Jun 29, 2018
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In the summer of 2013, I attended the Protostars & Planets VI (PPVI) conference, which is held every 6 years.  For the sixth edition, more than 500 astronomers and astrophysicists made it to Heidelberg, Germany, for a week of talks and discussions on the birth of young stars, the primordial disks of gas and dust surrounding them, and the exoplanets that eventually coalesce around them.  It was my first Protostars & Planets conference, and I was seven months into my new position as a young assistant professor at the University of Bern, Switzerland, so there was a sense of anticipation and excitation.  Even before setting foot in Heidelberg, the first thing that struck me about the conference was its format: all of the time was devoted to review talks, which placed early-career researchers at a disadvantage.  The idea was that researchers could form teams and compete for the right to give these review talks.  

As the conference progressed, my frustration started to build up.  There were clearly serious flaws with this format.  Ideally, the most established researchers in each subtopic would provide a balanced, thoughtful review of the state of the art and path the way forward.  It would be a public display of excellent scholarship.  In practice, one got the sense that this was not working as advertised.  After each review talk, members of the audience would march up to the microphone to protest that their work was not being fairly mentioned, or that the speaker held a view that did not reflect the entire landscape of research being performed in that subtopic.  Some of the discussions were contentious, and there was a sense that the opinions of the junior researchers were not being heard.  Considerable energy was devoted to these arguments, rather than the way forward - at least, that is what stuck in my memory.

An even greater source of frustration stemmed from the fact that PPVI was driven by a very specific ideology: start by forming stars, then form the protostellar disks, then the planetesimals, planets, etc.  The implicit assumption was that, if we could not understand the early steps of this process, then the later steps were not worth thinking about.  But exoplanets do exist, even if we do not understand how they formed, what they are made of, or the diversity of atmospheres they harbor.  A related (and deeply flawed) ideology is that we can model these highly complex, non-linear, interacting systems exhaustively in the computer - and if we cannot, we simply buy a larger computer.  A counter-example to this ideology is the carbon dioxide content of the atmosphere of Earth, which is controlled not by planet formation but rather by the carbonate-silicate cycle - a process that we cannot model from first principles, due to complexities such as erosion and plate tectonics.  We should study both the forward and inverse problems - the latter being that one starts from the observations and tries to back out the underlying physics and chemistry.  I was irked that exoplanetary atmospheres was essentially one of the last talks on the last day of the conference - a decision clearly driven by this ideology.  Considering that this is one of the most dynamic and rapidly growing subdisciplines in exoplanet science, it felt like a slap in the face for this community (which I belong to).  This was the last straw for me, and it planted the seeds of a new conference series in my mind.

Over the next few months, I vented my frustration to Didier Queloz, who is one of the co-discoverers of the first exoplanet orbiting a Sun-like star and a Cambridge University professor.  Didier is my Scientific Principal Investigator (PI) for the CHEOPS mission of the European Space Agency (ESA), and I am one of his "whips" (spokesperson for atmospheric characterisation) and Swiss delegates on the mission.  He simply replied, "Let's just do our own."  We agreed that this new conference series would focus solely on exoplanets, with stars, disks, etc, as secondary topics - a radical departure from the usual fare in Europe.  We also agreed that the outlook of the conference series would be international, but its logistical and organisational backbone would be European.  It would complement existing series as such Extreme Solar Systems and Exoclimes, both of which have American-led organisation.

We decided to rope in Thomas Henning of the Max Planck Institute for Astronomy (MPIA).  (Ironically, Thomas was also the organiser of PPVI.)  Together, we decided on the venues of the first three editions: Davos (2016), Cambridge (2018) and Heidelberg (2020).  At Davos, Jason Steffen (of TTV fame) came up to me excitedly and declared his enthusiasm for having Exoplanets IV in Las Vegas.  A year or two later, Ignas Snellen and Nuno Santos expressed their intent for Exoplanets V and VI in Amsterdam and Porto, respectively.  Amazingly, that means we are now booked till 2026!  (I am toying with the idea of having Exoplanets VII in Singapore in 2028.)

The Exoplanets II conference in Cambridge, England, caught us by surprise in many ways.  For Exoplanets I, we made preparations for 300 participants, but did not manage to fill all of the slots.  For Exoplanets II, all 300 available slots were filled by the early-bird registration deadline for students!  This completely unexpected development meant that some of the senior researchers were prevented from even registering.  A waiting list of 150 quickly built up; not long after, even the waiting list was shut down due to over-capacity.

Valuable community lessons were also learnt from Exoplanets II.  Despite the Scientific Organising Committee (SOC) consisting of 7 women out of 13 members in total, gender balance among the speakers did not attain parity.  This is due to a set of inter-related - and sometimes complex - reasons.  At some level, it reflects the fact that full professorships in exoplanet science in Europe are rarely filled by women - part of this may be due to topical inertia, as Europe is in the midst of pivoting its resources towards this topic.  Some other part of it is almost certainly due to archaic hiring practices.  

There was also plenty of debate regarding the role of the session chair.  Were the chairs biased towards picking more established folks to ask questions?  (When I chaired the opening session of Exoplanets II, I had a hard time getting people to ask questions, so I know this was not the whole story.)  Furthermore, having the ability to ask a concise, decisive, understandable question at a 300-person conference is a skill, one that took me years to hone.  There was also some discontent about individuals giving comments instead of asking questions during the Q&A sessions.  I personally think the dividing line is not so clear-cut - not all comments are useless, and not all questions are meaningful or thoughtful.  It depends on the intention behind the comment or question.

When a senior person is giving a review talk, it is her or his responsibility to practise inclusive, balanced, thoughtful yet critical scholarship, which means teaching the younger people in the room the state of the art of the subdiscipline in question, even if she or he disagrees with some of the published results.  Not all published results have equal importance - establishing scientific veracity was not, is not and never will be a democratic process - but it is important to elucidate why.  A shining example at Exoplanets II was Josh Winn's review talk on exoplanet detection - Josh has the rare gift of being able to surgically deliver fine scholarship with the timing of a stand-up comedian.  A firm, critical grasp of the published literature is a crucial component of a researcher's toolkit.  When a review-talk speaker cherry-picks the literature in a misleading way, it is the responsibility of other senior researchers in the room to stand up and point it out, otherwise the junior researchers will walk away with misconceptions that will echo for months or even years.  I have personally benefited from thoughtful, even deep, comments given by established figures in exoplanet science.  What is not constructive are comments made for the purpose of grandstanding - no one needs to know how smart you are, especially if you are veering off-topic.

Indeed, what is the role of the session chair?  In my mind, it is to make the session as compact and educational as possible.  The session chair is not just a mindless time-keeper - there are times when going slightly overtime is warranted, either because the speaker is doing such a dazzling job or the discussion is particularly important for most of the people in the room.  In these situations, the session chair needs to show a softer side.  At other times, when the speaker or audience member asking questions veers towards being long-winded, it is the job of the session chair to remind them to be concise.  In some situations, the session chair should exercise her or his authority to cut someone off - even if the speaker is just wasting one minute of time, it is really N minutes of wasted time since there are N members in the audience.  The session chair should be ruthless and not bow to authority - professors and students should receive equal treatment based on their actions, and not their rank.  The session chair may need to make decisions that are unpopular.

As the Exoplanets conferences expand towards having 500 or more participants, it becomes clear that the same practices and structures used to manage 200-person conferences no longer scale and break down.  How do we manage this expansion in an inclusive manner?  The usual practice is to create splinter or break-out sessions, where part of the conference is devoted to parallel sessions.  I would argue that this reduces inclusivity, as the original intention was to keep everyone on the same stage.  Here, Thomas Henning has a great idea: to create focused, curated poster sessions based on coherent themes.  A curator would spend 5 to 10 minutes on stage introducing each poster session, and further select several participants to deliver 1-minute "elevator pitches" of their posters.  Each session could be held over an extended, 3-hour lunch break, allowing ample time for discussion.  The theme of each poster session would change each day, thus allowing 100-200 people some voice in the conference discussions.

We will not get everything right immediately.  But the long-term outlook of the Exoplanets conference series allows us to continue to actively collect and implement constructive feedback, and forge ahead towards better ways of coming together as an exoplanet community.

Go to the profile of Kevin Heng

Kevin Heng

Professor and CSH Director, Center for Space and Habitability (CSH)

Theory, simulation and phenomenology of exoplanetary atmospheres, including radiative transfer, fluid dynamics, chemistry and inversion methods. I am also a writer for the American Scientist magazine and the recipient of the 2018 Chambliss Astronomical Writing Award of the American Astronomical Society. I am the author of "Exoplanetary Atmospheres: Theoretical Concepts & Foundations," a graduate-level textbook published by Princeton University Press.

3 Comments

Go to the profile of Ruth Milne
Ruth Milne 14 days ago

Sounds like the conference is going from strength to strength - congratulations!

Go to the profile of Paul Woods
Paul Woods 14 days ago

I've been attending astronomy conferences now for 17 years or so, and it amazes me that we still have some really poorly organised ones, as if conference organisers are unable or unwilling to learn from previous experiences. Somebody should really write a conference organisation 'bible' to propagate our shared wisdom. This could cover a range of advice from such complex topics as gender parity and inclusion on invited speaker lists to things as simple as printing names in LARGE FONTS on both sides of conference badges. 

Thanks for trying to re-think the way things are done in order to improve the conference experience for everyone, Kevin!

Go to the profile of Kevin Heng
Kevin Heng 3 days ago

Here is the list of feedback compiled from a combination of speaking to participants privately, listening to coffee/tea discussions and Twitter.  Be warned that some of the entries are contradictory, precisely because there is no agreement on some issues.  This list was emailed to Thomas Henning right after Exoplanets II in preparation for Exoplanets III.

Allow prorated registration for parents with kids to attend only part of conference 


Manage balance between number of students versus senior folks wrt early registration 


Improve gender balance of speakers 


Consider mix of main stage versus breakout sessions 


Allow for a long break (~3 hours) in the afternoon 


Consider live video streaming 


Coffee / interaction area needs room with better acoustics 


Clarify embargo policy 


Name on both sides of badge 


Pooled nannies


Deferred payment of registration for NASA employees or individuals in need of aid


Keep structure of session chair (SOC) and assistant session chair (LOC)


Keep free water bottles 


Curated poster sessions each day, where each session is on a coherent theme and introduced in the plenary by a curator (SOC member or senior person) during the main plenary.


Curator picks several posters for 1-minute “elevator pitches”


Printed programs


Avoid splinters / breakout sessions


Longer lunch breaks!


Keep end-of-day drinks to encourage interactions


More snacks during coffee/tea breaks.