
Dr Larissa Palethorpe
MSc, PhD
Expertise
I am an astrophysicist investigating how exoplanets form and evolve. By studying thousands of planets beyond our Solar System, I explore why some worlds are rocky like Earth while others retain thick atmospheres.
Current positions
Royal Society Career Development Fellow
School of Physics
Contact
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Biography
I completed my MSci in Physics with Astronomy at the University of Nottingham before undertaking a collaborative PhD in Astronomy between the University of Edinburgh and University College London. During my doctoral research, I used data from missions and facilities including TESS, CHEOPS, K2 and HARPS-N to study planets that lie between Earth and Neptune in size. This work focused on understanding the exoplanet radius valley and the processes that shape planetary atmospheres and compositions.
My research has led to the discovery and characterisation of several exoplanets, including the nearest transiting temperate Earth-sized planet discovered to date Gliese 12 b, for which I was a joint first author, and was featured in a NASA press release. I work closely with international collaborations including the HARPS-N and CHEOPS teams, and my research aims to improve our understanding of how small planets form, evolve, and fit into the broader population of planetary systems in our Galaxy.
Research interests
My research focuses on the formation, evolution, and characterisation of small exoplanets. I am particularly interested in planets that lie between Earth and Neptune in size, and what they can reveal about the physical processes that shape planetary systems.
A central theme of my work is understanding the exoplanet radius valley—the apparent deficit of planets between rocky super-Earths and gas-rich sub-Neptunes. By combining precise measurements of planetary masses, radii, and orbital architectures, I investigate how atmospheric loss, planetary interiors, and formation histories contribute to the observed diversity of exoplanets.
I use observations from both space- and ground-based facilities, including TESS, CHEOPS, HARPS-N, ESPRESSO, and JWST, to discover and characterise exoplanets. My research combines observational astronomy, statistical analysis, and population-level studies to connect individual planetary systems with broader trends across the exoplanet population.
I am also interested in developing methods to constrain the compositions and evolutionary pathways of small planets, particularly those in transitional regions of parameter space. These planets provide important laboratories for understanding the origins of Earth-like worlds and for informing future missions designed to search for habitable planets beyond the Solar System.
Projects and supervisions
Research projects
Tiny Worlds, Tremendous Insights: Analysis of Exoplanets in Transitional Zones
Principal Investigator
Managing organisational unit
School of PhysicsDates
01/01/2026 to 31/12/2029
Publications
Recent publications
01/05/2026Constraining small planet compositions for future missions
Monthly Notices of the Royal Astronomical Society