Bruno Chazelas
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View article: NIRPS and TESS reveal a peculiar system around the M dwarf TOI-756: A transiting sub-Neptune and a cold eccentric giant
NIRPS and TESS reveal a peculiar system around the M dwarf TOI-756: A transiting sub-Neptune and a cold eccentric giant Open
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…
View article: Simulating RISTRETTO: Proxima b detectability in reflected light
Simulating RISTRETTO: Proxima b detectability in reflected light Open
Context . The characterization of exoplanet atmospheres is one of the key topics in modern astrophysics. To date, transmission spectroscopy has been the primary method used, but upcoming instruments, such as those on the European Extremely…
View article: Quantifying thermal water dissociation in the dayside photosphere of WASP-121 b using NIRPS
Quantifying thermal water dissociation in the dayside photosphere of WASP-121 b using NIRPS Open
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…
View article: Diving into the planetary system of Proxima with NIRPS
Diving into the planetary system of Proxima with NIRPS Open
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…
View article: NIRPS joining HARPS at ESO 3.6 m
NIRPS joining HARPS at ESO 3.6 m Open
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…
View article: RISTRETTO: a VLT XAO design to reach Proxima Cen b in the visible
RISTRETTO: a VLT XAO design to reach Proxima Cen b in the visible Open
RISTRETTO is the evolution of the original idea of coupling the VLT\ninstruments SPHERE and ESPRESSO \\cite{lovis_2016a}, aiming at High Dispersion\nCoronagraphy. RISTRETTO is a visitor instrument that should enable the\ncharacterization o…
View article: ANDES, the high resolution spectrograph for the ELT: science goals, project overview, and future developments
ANDES, the high resolution spectrograph for the ELT: science goals, project overview, and future developments Open
The first generation of ELT instruments includes an optical-infrared\nhigh-resolution spectrograph, indicated as ELT-HIRES and recently christened\nANDES (ArmazoNes high Dispersion Echelle Spectrograph). ANDES consists of three\nfibre-fed …
View article: RISTRETTO: reflected-light exoplanet spectroscopy at the diffraction limit of the VLT
RISTRETTO: reflected-light exoplanet spectroscopy at the diffraction limit of the VLT Open
RISTRETTO is a visible high-resolution spectrograph fed by an extreme\nadaptive optics (AO) system, to be proposed as a visitor instrument on ESO VLT.\nThe main science goal of RISTRETTO is to pioneer the detection and atmospheric\ncharact…
View article: ANDES, the high-resolution spectrograph for the ELT: RIZ Spectrograph preliminary design
ANDES, the high-resolution spectrograph for the ELT: RIZ Spectrograph preliminary design Open
We present here the preliminary design of the RIZ module, one of the visible spectrographs of the ANDES instrument 1. It is a fiber-fed high-resolution, high-stability spectrograph. Its design follows the guidelines of successful predecess…
View article: RISTRETTO: Manufacturing of a single-mode visible high resolution spectrograph
RISTRETTO: Manufacturing of a single-mode visible high resolution spectrograph Open
The Spectrograph of the RISTRETTO instrument is now currently being manufactured. RISTETTO is an instrument designed to detect and characterize the reflected light of nearby exoplanets. It combines high contrast imaging and high resolution…
View article: The Near-Infrared Gatherer of Helium Transits (NIGHT)
The Near-Infrared Gatherer of Helium Transits (NIGHT) Open
This paper provides a comprehensive overview of the subsystems of the NIGHT\ninstrument. NIGHT (the Near Infrared Gatherer of Helium Transits) is a\nnarrowband, high-resolution spectrograph, marking the first dedicated survey\ninstrument f…
View article: The RISTRETTO simulator: exoplanet reflected spectra
The RISTRETTO simulator: exoplanet reflected spectra Open
The upcoming Ristretto spectrograph is dedicated to the detection and\nanalysis of exoplanetary atmospheres, with a primary focus on the temperate\nrocky world Proxima b. This scientific endeavor relies on the interplay of a\nhigh-contrast…
View article: NIRPS first light and early science: breaking the 1 m/s RV precision barrier at infrared wavelengths
NIRPS first light and early science: breaking the 1 m/s RV precision barrier at infrared wavelengths Open
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 $μ$…
View article: NIGHT: A compact, near-infrared, high-resolution spectrograph to survey helium in exoplanet systems
NIGHT: A compact, near-infrared, high-resolution spectrograph to survey helium in exoplanet systems Open
Among highly irradiated exoplanets, some have been found to undergo significant hydrodynamic expansion traced by atmospheric escape. To better understand these processes in the context of planetary evolution, we propose NIGHT (the Near-Inf…
View article: Ultraviolet astronomical spectrograph calibration with laser frequency combs from nanophotonic lithium niobate waveguides
Ultraviolet astronomical spectrograph calibration with laser frequency combs from nanophotonic lithium niobate waveguides Open
Astronomical precision spectroscopy underpins searches for life beyond Earth, direct observation of the expanding Universe and constraining the potential variability of physical constants across cosmological scales. Laser frequency combs c…
View article: RISTRETTO: coronagraph and AO designs enabling High Dispersion Coronagraphy at 2 λ/D
RISTRETTO: coronagraph and AO designs enabling High Dispersion Coronagraphy at 2 λ/D Open
International audience
View article: ANDES, the high resolution spectrograph for the ELT: project management and system engineering approaches for mastering its preliminary design phase
ANDES, the high resolution spectrograph for the ELT: project management and system engineering approaches for mastering its preliminary design phase Open
At the end of 2021, the ESO council approved the start of the construction phase for a High Resolution Spectrograph for the ELT, formerly known as ELT-HIRES, renamed recently as ANDES (ArmazoNes high Dispersion Echelle Spectrograph). The c…
View article: RISTRETTO: high-resolution spectroscopy at the diffraction limit of the VLT
RISTRETTO: high-resolution spectroscopy at the diffraction limit of the VLT Open
RISTRETTO is a visible high-resolution spectrograph fed by an extreme adaptive optics (XAO) system, to be proposed as a visitor instrument on ESO VLT. The main science goal of RISTRETTO is the detection and atmospheric characterization of …
View article: ANDES, the high resolution spectrograph for the ELT: science case, baseline design and path to construction
ANDES, the high resolution spectrograph for the ELT: science case, baseline design and path to construction Open
Ground-based and airborne instrumentation for astronomy IX (2022), Montreal, JUL 17-22, 2022.--Proceedings of SPIE - The International Society for Optical Engineering vol. 12184 Article number 1218424.--
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\nComplete list of authors: Marc…
View article: RISTRETTO: seven spaxel single mode spectrograph design
RISTRETTO: seven spaxel single mode spectrograph design Open
The RISTRETTO project is aiming to build an instrument that will detect the\nreflected light from close-by exoplanet. It is a two stage instrument: An\nextreme AO system in the visible, followed by a seven spaxel single mode High\nresoluti…
View article: The HD 93963 A transiting system: A 1.04 d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS
The HD 93963 A transiting system: A 1.04 d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS Open
We present the discovery of two small planets transiting HD 93963A (TOI-1797), a GOV star ( M * = 1.109 ± 0.043 M ⊙ , R * = 1.043 ± 0.009 R ⊙ ) in a visual binary system. We combined TESS and CHEOPS space-borne photometry with MuSCAT 2 gro…
View article: Chromatic drift of the Espresso Fabry-Pérot etalon
Chromatic drift of the Espresso Fabry-Pérot etalon Open
In the last decade, white-light illuminated Fabry-Pérot interferometers have been established as a widely used, relatively simple, reliable, and cost-effective way to precisely calibrate high-resolution echelle spectrographs. However, a re…
View article: HIRES, the high-resolution spectrograph for the ELT
HIRES, the high-resolution spectrograph for the ELT Open
HIRES will be the high-resolution spectrograph of the European Extremely Large Telescope at optical and near-infrared wavelengths. It consists of three fibre-fed spectrographs providing a wavelength coverage of 0.4-1.8 mic (goal 0.35-1.8 m…
View article: HIRES, the High-resolution Spectrograph for the ELT
HIRES, the High-resolution Spectrograph for the ELT Open
HIRES will be the high-resolution spectrograph at optical and near-infrared (NIR) wavelengths for ESO’s Extremely Large Telescope (ELT). It will consist of three fibre-fed spectrographs providing a wavelength coverage of 0.4–1.8 µm (with a…
View article: The CHEOPS mission
The CHEOPS mission Open
The CHaracterising ExOPlanet Satellite (CHEOPS) was selected on October 19, 2012, as the first small mission (S-mission) in the ESA Science Programme and successfully launched on December 18, 2019, as a secondary passenger on a Soyuz-Frega…
View article: ELT-HIRES, the high resolution spectrograph for the ELT: the Phase A study and the path to construction
ELT-HIRES, the high resolution spectrograph for the ELT: the Phase A study and the path to construction Open
International audience
View article: RISTRETTO: a pathfinder instrument for exoplanet atmosphere characterization
RISTRETTO: a pathfinder instrument for exoplanet atmosphere characterization Open
We introduce the RISTRETTO instrument for ESO VLT, an evolution from the original idea of connecting the SPHERE high-contrast facility to the ESPRESSO spectrograph (Lovis et al 2017). RISTRETTO is an independent, AO-fed spectrograph propos…
View article: KalAO the swift adaptive optics imager on the 1.2m Euler Swiss telescope in La Silla, Chile
KalAO the swift adaptive optics imager on the 1.2m Euler Swiss telescope in La Silla, Chile Open
KalAO is a natural guide star adaptive optics (AO) imager to be installed on the second Nasmyth focus of the 1.2m Euler Swiss telescope in La Silla, Chile. The initial design of the system is inspired on RoboAO with modifications in order …
View article: SPIRou: NIR velocimetry and spectropolarimetry at the CFHT
SPIRou: NIR velocimetry and spectropolarimetry at the CFHT Open
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…