Echoes: a new instrumental concept of spectro-imaging for Jovian seismology

Soulat, L.; Schmider, F. X.; Robbe-Dubois, S.; Appourchaux, T.; Bresson, Y.; Daban, J.-B.; Gaulme, P.; Gouvret, Carole

doi:10.1117/12.924875

Cited by 5 publications

(6 citation statements)

References 8 publications

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“…The JOVIAL instrument derives from the Doppler Sismo Imager (DSI) prototype that was developed in view of a possible space instrument. 10 The DSI instrument aims to provide velocity fields at the surface of the planet by measuring Doppler shift along the image of the planet. The DSI prototype was developed at the laboratory and tested on the sky.…”

Section: Design and Implementationmentioning

confidence: 99%

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Characteristics and performances of an interferometric Doppler imager installed at the 188 cm telescope of Okayama Observatory

Schmider

Dejonghe

Guillot

et al. 2020

Ground-Based and Airborne Instrumentation for Astronomy VIII

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We describe the performances of a novel Doppler imager, aimed to detect acoustic oscillations and atmospheric dynamics at the surface of giant planets of the Solar System in the frame of the JOVIAL (Jovian Oscillations detection by Velocity Imaging At several Longitudes) project. The first JOVIAL instrument was installed on the 188cm telescope at Okayama branch of National Astronomical Observatory of Japan (NAOJ) in April 2019. This instrument is a part of a ground based network of three identical instruments installed on telescopes around the world for continuous observations. First observations of Jupiter with the JOVIAL instrument were achieved in June 2019. We describe the instrument principle, its design and the set-up at Okayama observatory, as well as the performances reached during the first observing run. We finally provide plans for future observations with the network.

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Section: Design and Implementationmentioning

confidence: 99%

“…That is why we proposed the Echoes instrument in the frame of the JUICE mission. 10 In absence of such a project for the coming decade, the possibility remains of a ground-based network, able to provide more that 50% time-continuity. This was the origin of the JOVIAL network.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and performances of an interferometric Doppler imager installed at the 188 cm telescope of Okayama Observatory

Schmider

Dejonghe

Guillot

et al. 2020

Ground-Based and Airborne Instrumentation for Astronomy VIII

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“…The Doppler Spectro-Imager (DSI) is an instrument that pro-220 duces radial velocity maps of extended objects. Its concept and performance are described in two SPIE papers by Soulat et al (2012) and Gonçalves et al (2016). The instrument is a compact Mach-Zehnder (MZ) interferometer with a fixed Optical Path Difference (OPD) which provides four interferograms, 225 whose fringes are in phase quadrature from channel to channel.…”

Section: Instrumental Conceptmentioning

confidence: 99%

First measurements of Jupiter’s zonal winds with visible imaging spectroscopy

Gonçalves

Schmider

Gaulme

et al. 2019

Icarus

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We present the first measurements of Jupiter's wind profile ever obtained with Doppler velocity measurements in the visible. Hitherto, knowledge about atmospheric dynamics has been obtained with cloud-tracking techniques, which consist of tracking visible features from images taken at different dates. However, cloud tracking indicates the motion of large cloud structures, which is an indication of the speed of iso-pressure regions, rather than the speed of the actual atmospheric particles. Doppler imaging is as challenging -motions are usually less than 100 m s −1 -as appealing because it measures the speed of cloud particles instead of large cloud structures. Significant difference could appear in the case of atmospheric waves interfering with cloud structures. Here we present the first scientific results of a Doppler imaging spectrometer that is dedicated to giant-planet seismology and atmospheric dynamics by providing instantaneous line-of-sight-velocity maps of the planets of the solar system. The instrument has been developed in the framework of the projects JOVIAL (Jovian Oscillations through Velocity Images At several Longitudes) and JIVE in NM (Jovian Interiors from Velocimetry Experiment in New Mexico). It is a Fourier transform spectrometer with a fixed optical path difference working in the mid-visible domain, which monitors the position of solar Fraunhofer lines that are reflected in the planets' upper atmospheres. After describing the instrument principle and the different steps of data reduction, we report measurement of the average zonal wind speed of Jupiter, as a function of latitude, from datasets obtained in 2015 and 2016 with two different telescopes, when the planet was close to its opposition. Our results are consistent between the two years. We compare the results with wind profiles obtained by cloud tracking on HST (Hubble Space Telescope) images taken at the same epoch, and identify a significant discrepancy in the northern equatorial band.

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“…The velocity map can be extracted from the complex fringes Z by dividing it by Z instr , where Z instr are the instrumental fringes which are measured from a zero velocity field, obtained with a spectral lamp at the laboratory. The full procedure is well described in Soulat 16 .…”

Section: Data Processingmentioning

confidence: 99%

Advances in the development of a Mach-Zehnder interferometric Doppler imager for seismology of giant planets

et al. 2016

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The measurements of radial velocity fields on planets with a Doppler Spectro-Imager allow the study of atmospheric dynamics of giant planets and the detection of their acoustic oscillations. The frequencies of these oscillations lead to the determination of the internal structure by asteroseismology. A new imaging tachometer, based on a Mach-Zehnder interferometer, has been developed to monitor the Doppler shift of solar lines reflected at the surface of the planets. We present the principle of this instrument. A prototype was designed and built, following the specifications of a future space mission. The performance of the prototype, both at the laboratory and on the sky, is presented here.

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Echoes: a new instrumental concept of spectro-imaging for Jovian seismology

Cited by 5 publications

References 8 publications

Characteristics and performances of an interferometric Doppler imager installed at the 188 cm telescope of Okayama Observatory

Characteristics and performances of an interferometric Doppler imager installed at the 188 cm telescope of Okayama Observatory

First measurements of Jupiter’s zonal winds with visible imaging spectroscopy

Advances in the development of a Mach-Zehnder interferometric Doppler imager for seismology of giant planets

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