01
From sub-Neptunes to rocky worlds
I study the atmospheric and evolutionary pathways that connect gas-rich sub-Neptunes, bare rocky planets, and worlds that may retain secondary atmospheres.
Trottier Fellow · IREx · Université de Montréal
Tracing the fate of small-planet atmospheres.
I am an observational astrophysicist studying how atmospheres form, evolve, and disappear — from gaseous sub-Neptunes to rocky worlds.
Based inMontréal, Canada
Research
Where did the atmosphere go?
My work follows planetary atmospheres from their escaping upper layers to the deep regions probed in emission and transmission.
02
When the signal is smaller than the systematics
I connect detector-level behaviour and time-series systematics to atmospheric retrievals, making the faintest signals from JWST scientifically interpretable.
03
Atmospheres, from top to bottom
From escaping upper atmospheres in the ultraviolet to deeper layers in the infrared, I combine HST, JWST, and ground-based observations to trace atmospheric loss and retention.
Selected publications
Recent work across the exoplanet population.
2025
The Astronomical Journal
Sulfur dioxide in the atmosphere of the Neptune-mass planet HAT-P-26 b
JWST · NIRSpec G395H · H₂O, CO₂, and SO₂
2025
The Astronomical Journal
A super-solar metallicity in WASP-17 b’s dayside atmosphere
JWST · NIRISS SOSS eclipse spectroscopy
2024
The Astrophysical Journal Letters
Hints of a sulfur-rich atmosphere around the super-Earth L98-59 d
JWST · NIRSpec G395H · Small-planet atmospheres
2023
Astronomy & Astrophysics
The near-ultraviolet transmission spectrum of WASP-79 b
HST · STIS · Upper-atmosphere physics
Science outreach
Sharing the science behind distant worlds.
I enjoy bringing exoplanet discoveries beyond the research community — through public talks, interviews, and media stories that connect new observations to the bigger picture of how planets form and evolve.
Featured storyMy JWST work on L98-59 d and its possible sulfur-rich atmosphere in Science & Vie, August 2026
CV & experience
Observing, interpreting, and sharing new worlds.
My path spans aerospace engineering, ultraviolet spectroscopy, and the first years of JWST exoplanet science.
Download full CV2025 — present
Trottier Fellow
IREx · Université de MontréalLeading an independent program on the atmospheres and evolution of small exoplanets.
2023 — 2025
Postdoctoral Researcher
Space Telescope Science InstituteJWST Telescope Scientist Team and NIRSpec GTO science; time-series methods from detector behaviour to atmospheric interpretation.
2019 — 2022
PhD in Astronomy & Astrophysics
Paris-Saclay University · UVSQAtmospheric escape, Hubble spectroscopy, and the transition from super-Earths to sub-Neptunes.
Master’s in Astrophysics · Observatoire de Paris
Engineering degree · École Nationale de l’Aviation Civile
Beyond research
When the code is running, so am I.
When I am not studying distant worlds, I run long distances. I completed the 2025 New York City Marathon, followed by the NYC Half and Brooklyn Half in 2026.
2025New York City Marathon
2026NYC Half
2026Brooklyn Half
Contact