SOPHIE (spectrograph)
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| SOPHIE (spectrograph) | |
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| Name | SOPHIE |
| Caption | SOPHIE high-resolution echelle spectrograph |
| Manufacturer | Observatoire de Haute-Provence |
| Introduced | 2006 |
| Wavelength | visible |
| Resolution | 40,000–75,000 |
| Telescope | Observatoire de Haute-Provence, 1.93 m |
| 用途 | astronomical spectroscopy |
SOPHIE (spectrograph)
SOPHIE is a fibre-fed, cross-dispersed echelle spectrograph installed at the Observatoire de Haute-Provence 1.93-m telescope designed for high-precision radial-velocity measurements and general-purpose visible spectroscopy. Commissioned in 2006, SOPHIE has served programs ranging from exoplanet surveys to stellar physics, supporting observing campaigns led by institutions such as the CNRS, Université de Strasbourg, and international consortia including teams from European Southern Observatory and Harvard–Smithsonian Center for Astrophysics. The instrument operates in modes optimized for stability and throughput, contributing to follow-up observations for missions like Kepler, CoRoT, and TESS.
Overview
SOPHIE was conceived as a successor to the ESA-supported ELODIE spectrograph and was developed under the auspices of the Laboratoire d'Astrophysique de Marseille and partners at the Observatoire de Haute-Provence. The project drew on expertise from groups associated with Université Joseph Fourier, CNES, Max Planck Institute for Astronomy, and the Institut d'Astrophysique de Paris. Its scientific remit included precision radial velocities for exoplanet detection, chemical abundance analysis for stars observed by Hipparcos and Gaia, and spectroscopic characterization of transient sources discovered by programs such as ASAS-SN and Palomar Transient Factory.
Design and Instrumentation
SOPHIE is a stabilized, bench-mounted, fibre-fed echelle spectrograph employing a white-pupil optical layout similar to designs used at facilities like Keck Observatory and Subaru Telescope. The instrument uses an R2 echelle grating, cross-dispersing prisms, and a thermally controlled cryostat to limit instrumental drift, with a CCD detector system comparable in concept to arrays used at La Silla Observatory and McDonald Observatory. Light is fed from the 1.93-m telescope via octagonal and circular fibres, with calibration inputs provided by thorium-argon lamps and an iodine absorption cell technique analogous to approaches developed at Lick Observatory and Harvard–Smithsonian Center for Astrophysics. The optical bench is enclosed within a vacuum and temperature regulation system inspired by designs at European Southern Observatory and Anglo-Australian Observatory to achieve meter-per-second stability targets.
Observational Capabilities and Performance
SOPHIE offers spectral coverage across the visible band, enabling resolving powers of approximately 40,000 in high-efficiency mode and up to 75,000 in high-resolution mode, comparable to instruments like HARPS and HIRES. The radial-velocity precision routinely achieves a few meters per second for bright, quiet stars, supporting detection of Neptune- and Jupiter-mass exoplanets similar to discoveries announced by teams at University of Geneva and University of California, Berkeley. The instrument's stability and throughput permit time-series spectroscopy for asteroseismology campaigns coordinated with observatories such as Cerro Tololo Inter-American Observatory and space missions like CoRoT and Kepler.
Science Programs and Key Discoveries
SOPHIE contributed to large-scale exoplanet searches and follow-up confirmation of transit candidates from SuperWASP, HATNet, and TESS, enabling mass determinations and orbital characterizations for dozens of planets. Collaborative discoveries involved researchers from Institut d'Astrophysique de Paris, Observatoire de Genève, and Max Planck Institute for Astronomy, linking SOPHIE data to publications on hot Jupiters, multi-planet systems, and eccentric companions. The spectrograph has supported stellar abundance surveys complementing Gaia astrometry and provided spectra for studies by teams at University of Cambridge and ETH Zurich on stellar rotation and activity cycles. SOPHIE data aided transient classification for projects run by Palomar Transient Factory and Catalina Sky Survey, and enabled follow-up of microlensing and tidal disruption events examined by groups at Princeton University and Caltech.
Data Reduction and Calibration
Data from SOPHIE are processed with a dedicated pipeline developed by teams at Observatoire de Haute-Provence, incorporating algorithms for order extraction, wavelength calibration using thorium-argon references, and radial-velocity computation through cross-correlation with numerical masks constructed from solar-type and late-type stellar atlases comparable to masks used by HARPS teams. The pipeline applies blaze correction, cosmic-ray rejection, and barycentric velocity corrections following conventions used at European Space Astronomy Centre and NASA Goddard Space Flight Center. Advanced post-processing for high-precision work incorporates drift correction using simultaneous calibration fibres and line-by-line analysis akin to methods employed by researchers at University of Geneva and Institut d'Astrophysique de Paris.
Operational History and Upgrades
Following commissioning in 2006, SOPHIE entered science operation and soon replaced ELODIE as the prime radial-velocity facility at the Observatoire de Haute-Provence. Upgrades in subsequent years included fibre-link improvements, the implementation of octagonal fibres to reduce modal noise inspired by developments at Observatoire de Paris, and thermal and pressure stabilization refinements paralleling efforts at La Silla Observatory. A major improvement to calibration and simultaneous-reference capabilities was introduced to enhance precision for programs coordinated with Kepler and TESS follow-up teams. SOPHIE has remained a workhorse instrument for medium-aperture spectroscopic campaigns and training for groups from Université de Strasbourg and partner institutions.
Collaborations and Access Policies
SOPHIE operations are managed by staff at the Observatoire de Haute-Provence under governance involving the CNRS and French universities, with observing time allocated through national committees and international collaborations similar to access models at European Southern Observatory and NASA. Key partnerships have included teams from Institut d'Astrophysique de Paris, Laboratoire d'Astrophysique de Marseille, Max Planck Institute for Astronomy, and observing consortia tied to surveys like SuperWASP and HATNet. Data access policies provide proprietary periods for principal investigators while reduced products and radial-velocity tables have been shared with public archives and collaborative networks akin to the data practices of Gaia and Kepler consortia for legacy science.
Category:Astronomical spectrographs Category:Observatoire de Haute-Provence instruments