Explanipedia

NIRPS and TESS reveal a peculiar system around the M dwarf TOI-756: A transiting sub-Neptune and a cold eccentric giant Open

Léna Parc, F. Bouchy, Neil J. Cook, Nolan Grieves, Étienne Artigau , et al. · 2025

Context . The Near InfraRed Planet Searcher (NIRPS) joined HARPS on the 3.6-m ESO telescope at La Silla Observatory in April 2023, dedicating part of its Guaranteed Time Observations (GTO) program to the radial velocity follow-up of TESS p…

Quantifying thermal water dissociation in the dayside photosphere of WASP-121 b using NIRPS Open

Neil J. Cook, Khaled Al Moulla, Étienne Artigau, S. C. C. Barros, F. Bouchy , et al. · 2025

The intense stellar irradiation of ultra-hot Jupiters results in some of the most extreme atmospheric environments in the planetary regime. On their daysides, temperatures can be sufficiently high for key atmospheric constituents to therma…

Diving into the planetary system of Proxima with NIRPS Open

A. Suárez Mascareño, Étienne Artigau, L. Mignon, X. Delfosse, Neil J. Cook , et al. · 2025

We obtained 420 high-resolution spectra of Proxima, over 159 nights, using the Near Infra Red Planet Searcher (NIRPS). We derived 149 nightly binned radial velocity measurements with a standard deviation of 1.69 ms −1 and a median uncertai…

NIRPS detection of delayed atmospheric escape from the warm and misaligned Saturn-mass exoplanet WASP-69 b Open

R. Allart, Yann Carteret, V. Bourrier, L. Mignon, Frédérique Baron , et al. · 2025

Context . Near-infrared high-resolution échelle spectrographs unlock access to fundamental properties of exoplanets, from their atmospheric escape and composition to their orbital architecture, which can all be studied simultaneously from …

NIRPS joining HARPS at ESO 3.6 m Open

F. Bouchy, R. Doyon, F. Pepe, Claudio Melo, Étienne Artigau , et al. · 2025

Context . The Near-InfraRed Planet Searcher (NIRPS) is a high-resolution, high-stability near-infrared (NIR) spectrograph equipped with an adaptive optics (AO) system. Installed on the ESO 3.6-m telescope at La Silla Observatory, Chile, it…

HARMONI at ELT: towards final designs and AIT strategies for SCAOS sub-system in NGSS Open

Jean-François Sauvage, Zalpha Challita, Edgard Renault, William Bon, Alexandre Bozier , et al. · 2024

International audience

MOSAIC at the ELT: a unique instrument for the largest ground-based telescope Open

R. Pelló, M. Puech, Éric Prieto, M. Rodrigues, Rubén Sánchez-Janssen , et al. · 2024

Pelló, Roser et al.-- Full list of authors: Pelló, Roser; Puech, Mathieu; Prieto, Éric; Rodrigues, Myriam; Sanchez-Janssen, Rubén.; Dalton, Gavin B.; Ducret, Franck; El Hadi, Kacem; García-Vargas, María. L.; Lynn, Jeff; Bharmal, Nazim A.; …

CHirality Analyzer In-Situ (CHAIS) - A Novel Approach to Planetary Surface Characterisation Open

Mariya Krasteva, John Carter, Fabrice Madec, Zalpha Challita, Vassilissa Vinogradoff , et al. · 2024

The exploration of planetary surfaces is fundamental to our understanding of planetary evolution, habitability, and the origin of life. The chemical composition is typically amongst the main scientific goals of planetary exploration missio…

MOSAIC@ELT: the optical design of the NIR spectrograph Open

Johan Floriot, Éric Prieto, Zalpha Challita, Laurent Martin, Tony Pamplona , et al. · 2024

International audience

MOSAIC@ELT: towards final design and AIT development of an athermal camera prototype for the NIR-spectrograph Open

Tony Pamplona, Zalpha Challita, Johan Floriot, Laurent Martin, Franck Ducret , et al. · 2024

International audience

NIRPS first light and early science: breaking the 1 m/s RV precision barrier at infrared wavelengths Open

Étienne Artigau, F. Bouchy, René Doyon, Frédérique Baron, Lison Malo , et al. · 2024

The Near-InfraRed Planet Searcher or NIRPS is a precision radial velocity spectrograph developed through collaborative efforts among laboratories in Switzerland, Canada, Brazil, France, Portugal and Spain. NIRPS extends to the 0.98-1.8 $μ$…

HARMONI at ELT: Towards a final design for the natural guide star sensors system Open

Kjetil Dohlen, Pascal Vola, Zalpha Challita, Tim Morris, Jean-François Sauvage , et al. · 2022

International audience

SPIRou: NIR velocimetry and spectropolarimetry at the CFHT Open

J.‐F. Donati, Driss Kouach, C. Moutou, René Doyon, X. Delfosse , et al. · 2020

This paper presents an overview of SPIRou, the new-generation near-infrared spectropolarimeter/precision velocimeter recently installed on the 3.6-m Canada–France–Hawaii Telescope (CFHT). Starting from the two main science goals, i.e., the…

Four winters of photometry with ASTEP South at Dome C, Antarctica Open

Nicolas Crouzet, E. Chapellier, T. Guillot, D. Mékarnia, A. Agabi , et al. · 2018

Context . Dome C in Antarctica is a promising site for photometric observations thanks to the continuous night during the Antarctic winter and favorable weather conditions. Aims .We developed instruments to assess the quality of this site …

SPIRou: A NIR Spectropolarimeter/High-Precision Velocimeter for the CFHT Open

J.‐F. Donati, Driss Kouach, M. Lacombe, Sébastien Baratchart, René Doyon , et al. · 2018

Monitoring the optical turbulence in the surface layer at Dome C, Antarctica, with sonic anemometers Open

É. Aristidi, J. Vernin, E. Fossat, F. X. Schmider, Tony Travouillon , et al. · 2015

The optical turbulence above Dome C in winter is mainly concentrated in the\nfirst tens of meters above the ground. Properties of this so-called surface\nlayer (SL) were investigated during the period 2007-2012 by a set of sonics\nanemomet…

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