[Spectroscopie Doppler par corrélation croisée : une possibilité pour détecter des planètes similaires à la Terre]
Au milieu du 20ème siècle, un changement de paradigme est apparu concernant la fréquence attendue des systèmes planétaires dans la galaxie ...un changement induit par l’observation des vitesses de rotation des étoiles de la séquence principale basse (Struve 1952) !
A la même époque, Fellgett (1955) propose de concentrer l’information Doppler diluée sur plusieurs dizaines de milliers de raies d’absorption pour permettre la mesure précise des vitesses stellaires. Cette idée a permis d’améliorer l’efficacité des mesures de vitesse radiale d’un facteur supérieur à 1000. Progressivement, la précision de la nouvelle génération de spectrographes utilisant la corrélation croisée est améliorée de 300 m/s à 0,1 m/s. ...Une idée qui contribuera de manière importante à la découverte de 51 Pegasi b et de plusieurs centaines de systèmes planétaires.
Les spectrographes à corrélation croisée dans le visible ou l’infrarouge seront-ils aujourd’hui capables de détecter des planètes rocheuses dans la zone habitable associée à leur étoile hôte ?
In the middle of the 20th century, a paradigm shift appeared concerning the expected frequency of planetary systems in the galaxy ...a shift induced by the observation of the rotational velocities of low main sequence stars (Struve 1952)!
At the same time, Fellgett (1955) proposed to concentrate the diluted Doppler information on several tens of thousands of absorption lines to allow the precise measurement of stellar velocities. This idea improved the efficiency of radial velocity measurements by a factor of over 1000. Gradually the accuracy of the new generation of spectrographs using cross-correlation is improved from 300 m/s to 0.1 m/s. ...An idea that will contribute in an important way to the discovery of 51 Pegasi b and several hundreds of planetary systems.
Will visible or infrared cross-correlation spectrographs today be able to detect rocky planets in the habitable zone associated with their host star?
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Mot clés : Astronomie, Planétologie, Exoplanètes, Exobiologie, Vélocimétrie
Michel Mayor 1
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@article{CRPHYS_2023__24_S2_27_0,
author = {Michel Mayor},
title = {Doppler cross-correlation spectroscopy as a path to the detection of {Earth-like} planets},
journal = {Comptes Rendus. Physique},
pages = {27--36},
publisher = {Acad\'emie des sciences, Paris},
volume = {24},
number = {S2},
year = {2023},
doi = {10.5802/crphys.153},
language = {en},
}
Michel Mayor. Doppler cross-correlation spectroscopy as a path to the detection of Earth-like planets. Comptes Rendus. Physique, Volume 24 (2023) no. S2, pp. 27-36. doi : 10.5802/crphys.153. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.153/
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