Substellar Science with the Euclid Space Mission (SUBSTELLAR) is a project aimed at mining the Euclid surveys for pushing the frontier of knowledge in substellar science.

SUBSTELLAR is an Advanced Grant awarded to Prof. Eduardo L. Martín (Instituto de Astrofísica de Canarias) by the European Research Council. 

The primary science goal of SUBSTELLAR is to reveal and investigate the faint objects that lurk in the darkness beyond the limits of stellar engines, using mainly the new data arriving from the ESA Euclid space mission.

Euclid is a space mission led by the European Space Agency (ESA) to conduct a deep, single-epoch survey of 15,000 deg2 of sky with visible and near-infrared photometry and spectroscopy, and 40 deg2 multi-epoch very deep surveys. Euclid was launched at July 1st 2023.

The unprecedented combination of sensitivity, areal coverage, spatial resolution, data homogeneity and spectral information will naturally be of tremendous benefit to other areas of astrophysics. Two Euclid Independent Legacy Science (ILS) programs have been designated by ESA to develop and pursue independent science programs that capitalize on the unique data products of the Euclid surveys.

SUBSTELLAR will re-use existing ground-based and space-based multiwavelength data to complement the new data obtained with the Euclid space mission.


Latest news





Apr 24 2024, 11:19

SUBSTELLAR project article highlighted in Nature Astronomy journal

The article "Reconnaissance ultracool spectra in the Euclid Deep Fields"   -recently published in  arXiv by SUBSTELLAR researchers and colaborators J.-Y. Zhang, N. Lodieu, and E. L. Martín- has been highlighted in the journal Nature Astronomy

According to Lucca Maltagliati, author of the highlight, Zhang et al. demonstrate that Euclid, despite its low spectral resolution, is able to determine the spectral type of observed Ultra Cool Dwarfs (UCD) and determine their age group. The set of eight objects used by the authors can function as a benchmark for future observations. Euclid is expected to visit each Euclid Deep Field around 40–50 times, improving the signal-to-noise ratio substantially and reaching magnitudes of approximately 26.3, 26.5 and 26.4 in the YE, JE, and HE bands, respectively. This will allow it not only to expand our UCD catalogue greatly, but also determine their characteristics such as their parallax, proper motion and photometric variability.

Nature Astronomy publishes research, reviews and commentary at the cutting edge of astronomy, astrophysics and planetary science. Aiming to promote closer interaction between diverse astronomy-relevant disciplines, the editors of the journal consult widely with researchers at all stages of their careers, and more than one third of their commissioned authors are women.

More details at: Maltagliati, L. Expanding our limits with Euclid. Nat Astron 8, 406 (2024).

Apr 24 2024, 07:59

Euclid Spain Meeting 2024

The Euclid Spain Meeting 2024 was held in Barcelona at the Institut de Ciencies de L'Espai (ICE-CSIC) on 18th - 19th April 2024.

Representing SUBSTELLAR project, J.-Y. Jerry Zhang presented the talk entitled ILS Brown Dwarfs Overview

Apr 17 2024, 10:45

Conference "Découvrir les Trésors de l'Univers" (Marrakech, April 16, 2024)

Prof. Eduardo Martin, SUBSTELLAR Principal Investigator, and Khalid Barkaoui, SUBSTELLAR Posdoctoral Researcher, attended the conference " Découvrir les Trésors de l'Univers " held in Marrakech, Morrocco (April 16, 2024), and co-organised by the Cervantes Institute of Marrakech and the company Light Bridges.

Both SUBSTELLAR participantss made presentations at the conference: 

"A la découverte des planètes perdus avec le télescope spatial EUCLID" (Prof. E. Martín)

"À la recherche de vie sur des planètes similaires à la Terre autour d'étoiles ultrafroides proches" (Dr K. Barkaoui)


Mar 15 2024, 10:34

SUBSTELLAR Team already completed!

The last three postdoctoral positions of the SUBSTELLAR project has been already awarded, so, our team is already completed. It is formed by: Eduardo Martín (Principal Investigator); Marusa Zerjal, Khalid Barkaoui, Carlos Domínguez and Nikola Vitas (Postdoctoral Researchers); Stella Tsilia, Sara Muñoz and Nafise Sedighi (Predoctoral Researchers), and Alberto Escobar (Project Manager). Predoctoral  researcher Junyan Zhang is also working within SUBSTELLAR team but funded by another funding source.

















Welcome to all SUBSTELLAR team members, there are exciting challenges ahead!

Feb 19 2024, 10:29

Post-doc position related to «The stellar-substellar limit in the large scale survey Euclid»

Post-doctoral researcher position in astrophysics at Institut UTINAM, Besançon, France.

The astrophysical team at the Institut UTINAM (Besançon Observatory) is offering a post-doc position related to «The stellar-substellar limit in the large scale survey Euclid.»

The position is funded by the Université of Franche-Comté, for 12 months, renewable.

The successful applicant will work on the identification of ultra cool dwarfs in Euclid fields, and may propose new identification techniques and explore the possibility of using the precise PSF of Euclid to identify close binaries. Other challenges can be addressed, such as to determine the luminosity function, infer the most likely low-mass end of the initial mass function and explore its degree of universality in different components of the Milky Way. 

The candidate will be working with the international Euclid UCD group within the consortium, as well as the Gaia UCD team.

More details can be found at