About me

I'm an astrophysics researcher at the University of Geneva, focusing on instrumentation and exoplanet atmospheres. I build the tools that help us understand our cosmic neighborhood.

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Casper Farret Jentink - Astrophysicist
Image credit: F. Luthi, 2025

About Me

Exoplanetary researcher at the Observatory of Geneva, focusing on instrumentation. Currently, I am in charge of the NIGHT project: an instrument and survey for the measurement of exoplanet helium atmospheres to study the origins of the observed exoplanet population. I have a strong interest in astronomical instrumentation and exoplanet astrophysics. Besides astrophysics, I care about the social aspects of our work - free access to knowledge and equity and inclusion.

My research interests include:

  • Astronomical instrumentation design
  • High-resolution spectroscopy
  • Exoplanetary atmospheres
  • Exoplanet formation and evolution

Featured Projects

NIGHT Instrument
Image credit: M. Garlick, 2025

NIGHT

Near-Infrared Gatherer of Helium Transits - A dedicated instrument for studying exoplanetary atmospheres.

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ABORAS Instrument
Image credit: C. Farret Jentink, 2019

ABORAS

A dual-Beam polarimetric Robotic Aperture for the Sun - For high-precision, polarimetric RV solar measurements.

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Recent Publications

CORALIE radial-velocity search for companions around evolved stars (CASCADES) IV: New planetary systems around HD 87816, HD 94890, and HD 102888 and an update on HD 121056
Fontanet, E., Udry, S., Ségransan, D., Figueira, P., Acevedo Barroso, J. A., Akinsanmi, B., ... & Farret Jentink, C., ... & Viviani, G.
Astronomy and Astrophysics
arXiv: 2505.14317
High-resolution, high-efficiency narrowband spectroscopy with an s-p-phased holographic grating in double pass
Farret Jentink, C., Pepe, F., Lovis, C., Schwab, C., Wildi, F., Clawson, A.
Astronomy & Astrophysics
arXiv: 2405.18899 PDF
Vertical structure of an exoplanet's atmospheric jet stream
Seidel, J. V., Prinoth, B., Pino, L., dos Santos, L. A., Chakraborty, H., Parmentier, V., ... & Farret Jentink, C., ... & Pepe, F. A.
Nature, 639(8056), 902-908 (2025)
DOI: 10.1038/s41586-025-08664-1 arXiv: 2502.12261 PDF
The Near-Infrared Gatherer of Helium Transits (NIGHT)
Farret Jentink, C., Pepe, F., Lovis, C., Bovay, S., Wildi, F., Chazelas, B., ... & Cochard, F.
Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, Vol. 13096 (2024)
DOI: 10.1117/12.3014420 arXiv: 2405.18899 PDF
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