From envelopes to atmospheres

Copenhagen 13-15 October 2026

A 3-day workshop, covering the growth of planets in protoplanetary discs and their atmospheric evolution, including both theoretical and observational perspectives.

A special focus will be placed on obtaining a better understanding of (1) the gaseous envelopes around embedded planets, (2) compositional processing of solids as they drift inwards in the disc and are accreted through planetary envelopes, (3) the atmospheric evolution after disc dissipation.

Travel

Meeting location: Top floor of the Maersk Tower (google maps)

Access instructions to get to the meeting venue at Mærsk Tower (Blegdamsvej 3B, 2200 København N):

• Enter at the Main Entrance (map)
• The meeting room is on the 15th floor in building 7 (the main tower)
• Once inside the building, press the 15th floor button before entering the elevator
• The meeting is in the Faculty Lounge (Room 7.15.107A)

Airport: Copenhagen airport (IATA:CPH)
Public transportation: guide
October weather: around 10 degrees and be prepared for rain

Registration

Organisation

Organisers

Ayumu Kuwahara - ayumu.kuwahara@sund.ku.dk
Michiel Lambrechts - michiel.lambrechts@sund.ku.dk

LOC

Ziyan Xu - ziyan.xu@sund.ku.dk
Geoffrey Andama - geoffrey.andama@sund.ku.dk
Haiyang Wang - haiyang.wang@sund.ku.dk
Anders Johansen - anders.johansen@sund.ku.dk

Please feel free to reach out to us with any questions you may have:

This meeting is hosted by the Globe Institute at the University of Copenhagen. We acknowledge financial support by the Carlsberg foundation (grant CF26-0860, PI Ayumu Kuwahara).

Program

Tuesday 13/10/2026 – Day 1
Planets in discs
Chairs: M. Lambrechts, A. Johansen

08:50-09:00 Welcome and Opening (Ayumu Kuwahara and Michiel Lambrechts)
09:00-09:30 Chris Ormel
Phase change processes during planet formation
09:30-10:00 Zhaohuan Zhu
Giant planet runaway from start to finish
10:00-10:30 Coffee break
10:30-11:00 Ayumu Kuwahara
Dust transport in envelopes of disk-embedded planets
11:00-11:30 Leonardo Krapp
From protoplanetary envelopes to exomoons: The role of multi-species dust and gas dynamics
12:00-13:30 Lunch
13:30-14:00 Ziyan Xu
Pebble Accretion in Convective Envelopes: The Role of Dust Size and Aerodynamic Drag
14:00-14:30 Andrew Youdin
Planetary Gas Envelopes: From Bondi Accretion to 3D Solutions
14:30-15:00 Avery Bailey
The Radiation-Hydrodynamics of Planetary Accretion Flows
15:00-15:30 Coffee break
15:30-16:30 End-of-day talks
End-of-day speakers:
B. Bitsch
COST promo
Christian Holm
Accretion across scales: Streamers, surface-layer transport, and rapid replenishment in young protoplanetary discs
Aiden Kriel
Radiative Multifluid Dust Dynamics in the Circumplanetary Region
Bingjie Zha
Thermodynamics of gas giants forming via accretion shocks: The role of molecular hydrogen dissociation
Restaurant suggestions: Foodclub Nørrebro / Under Uret / Kopan / Captain H / Søernes Ølbar

Wednesday 14/10/2026 – Day 2
Planets in discs and Composition of discs and planets
Chairs: Andrew Youdin, Allona Vazan

09:00-09:30 Richard Nelson
Planet migration in low viscosity protoplanetary discs
09:30-10:00 Ondřej Chrenko
Sculpting Super-Earth Envelopes: Gap Opening Close In vs. Eccentricity Driving Farther Out
10:00-10:30 Coffee break
10:30-11:00 Sijme-Jan Paardekooper
Planetesimal Formation: How and Where?
11:00-11:30 Tom Konijn
Pebble accretion as a fluid and pebble flow beyond the isolation mass
12:00-13:00 Lunch
13:00-13:30 Bertram Bitsch
The origin of the heavy element content of giant planets
13:30-14:00 Anders Johansen
Planetary population synthesis with envelope processing
14:00-14:30 Haiyang Wang
Volatile depletion in rocky planets as a chemical fingerprint of hybrid accretion
14:30-15:00 Kazumasa Ohno
Linking Exoplanet Atmospheres to Protoplanetary Disks in the JWST Era
15:00-15:30 Coffee break
15:30-16:30 End-of-day talks
End-of-day speakers:
Camila Koshikumo
Giant Planet Formation in VSI-Turbulent Disks
Geoffrey Andama
Pebble growth and drift past planetary gaps
Sebastian Lorek
From planetesimals to planets with N-body simulations in the giant-planet formation region
Linru Fang
Tracing Thermal Processing of Planetary Building Blocks with Isotopes
16:30-17:00 Summary of today's talks (Wlad Lyra)
18:00-20:30 Conference dinner at JUMA

Thursday 15/10/2026 – Day 3
Evolving composition of planets
Chairs: Chris Ormel, Bertram Bitsch

09:00-09:30 Hilke Schlichting
Redefining interiors and envelopes: hydrogen–silicate miscibility and its consequences for the structure and evolution of sub-Neptunes
09:30-10:00 Allona Vazan
From polluted envelopes to observed atmospheres: Gyr evolution of planetary composition
10:00-10:30 Coffee break
10:30-11:00 Marie Steinmeyer
Impact of Atmosphere-Interior Coupling on the Structure and Evolution of Sub-Neptunes
11:00-11:30 Vera Sparrman
When the core ate the atmosphere
11:30-12:00 Tadahiro Kimura
Formation of water-enriched envelopes of sub-Neptunes
12:00-13:00 Lunch
13:00-13:30 Francesca Miozzi
An Experimental Perspective on Planetary Evolution
13:30-14:00 James Rogers
Testing the prevalence of hydrogen-silicate miscibility in young sub-Neptunes
14:00-14:30 Daria Kubyshkina
Composition-dependent atmospheric mass loss within the context of planetary evolution models
15:00-15:30 Coffee break
15:30-16:00 Eva Zlimen
Reconciling Giant Impacts with the Radius Valley
16:00-16:30 Zicong Xiao
Collisional Devolatilization of Planetary Building Blocks
16:30-17:00 Zibo Liu
Connecting Stellar Chemistry to Sub-Neptune Composition
17:00-17:15 Closing words (Michiel Lambrechts)
17:15 End of conference

Registered Participants

(last update 23/09)