LIRA
Laboratory for Instrumentation and Research in Astrophysics

LIRA, a pioneer in astrophysics and instrumentation, pushes back the frontiers of knowledge

LENS: LIRA – Weekly Highlight

Photonics chips for observing other worlds

15 June 2026

PLANETES is an instrument project designed to detect and characterise exoplanets. It will be installed on the European Southern Observatory’s (ESO) Very Large Telescope Interferometer (VLTI) by the end of 2028, complementing the GRAVITY instrument, in order to extend observations to shorter wavelengths, i.e. from 1 to 1.3 µm (J-band), whereas GRAVITY observes from 2 µm to 2.4 µm (K-band).

Like GRAVITY, PLANETES will rely on a photonic chip to combine and interfere the light collected by the four VLTI telescopes. As part of her PhD research, Jehanne Sarrazin is characterising several prototypes of these chips at Meudon on a dedicated test bench, in order to identify the most effective solution for the instrument.

These components are specially designed to efficiently guide infrared light. In the photo, visible light has been deliberately injected into a chip to reveal its optical guides: as these are not optimised for these wavelengths, some of the light is scattered, making their path visible.

Credits: Raphaël de Assis Peralta
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SEMINAR Tuesday 30 June 2026 14:00
Séminaires du pôle Systèmes Exoplanétaires
Jiangpei Dou Nanjing (Institute of Astronomical Optics & Technology, Chinese Academy of Sciences) : Introduction of Cool Planets Imaging Coronagraph...
SEMINAR Thursday 2 July 2026 11:00
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Presentation

LIRA, a CNRS joint research unit at Paris Observatory, is a laboratory of excellence in astrophysics and instrumentation. It studies astrophysical objects, from the Solar System to our Galaxy and beyond, through five thematic areas. Through international collaboration and instrumental innovation, it pushes back the frontiers of science and contributes to the training and dissemination of knowledge.

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Our projects

MIRS on the JAXA MMX mission

The Martian Moons eXploration (MMX) mission of JAXA (Japan Aerospace Exploration Agency) is the first sample-return mission from the Phobos satellite. It also includes an exploration of the Martian system. The mission’s primary objective is to decipher the origin of Martian moons, which will provide important information on planet formation and the conditions for the emergence of water on Earth-like planets.

The MIRS (MMX InfraRed Spectrometer) instrument, developed under the leadership of LESIA (now LIRA), is an imaging spectrometer that will characterize the composition of the Martian system and help select candidate sites for sample collection.

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GRAVITY+

The GRAVITY instrument, installed on the European Southern Observatory’s Very Large Telescope Interferometer (VLTI/ESO), has produced spectacular and transformative results on the supermassive black hole at the centre of the Milky Way, the active nuclei of other galaxies, proto-planetary disks around young stars and exoplanets. GRAVITY+ aims to modernise both VLTI and GRAVITY to make them ≈ 100 times more sensitive, while increasing sky coverage by a factor of ≈ 100, and contrast in the vicinity of bright objects by a factor of ≈ 10. These gains will benefit all the VLTI’s current and future instruments for the next 20 years, and will perpetuate it as a unique infrastructure in the world.

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Contacts

Postal address
Observatoire de Paris
5, place Jules Janssen
92195 Meudon

Phone
01 45 07 77 01

Mail
contact.lira@obspm.fr

Meudon site

LIRA
Observatoire de Paris
5, place Jules Janssen
92195 MEUDON Cedex

How to get to Meudon

Paris site

LIRA
Observatoire de Paris
77, Avenue Denfert-Rochereau
75014 Paris

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Cergy site

LIRA - Site de Neuville II
UFR Sciences et Techniques - Département de physique
5, mail Gay Lussac
95000 Neuville-sur-Oise

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