期刊
ASTRONOMY & ASTROPHYSICS
卷 549, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201219979
关键词
instrumentation: spectrographs; techniques: radial velocities; planetary systems; stars: oscillations
资金
- Programme national de planetologie (PNP) of the CNRS/INSU, France
- French National Research Agency [ANR-08-JCJC-0102-01]
- Agence Nationale de la Recherche (ANR) [ANR-08-JCJC-0102] Funding Source: Agence Nationale de la Recherche (ANR)
High-precision spectrographs play a key role in exoplanet searches and Doppler asteroseismology using the radial velocity technique. The 1 ms(-1) level of precision requires very high stability and uniformity of the illumination of the spectrograph. In fiber-fed spectrographs such as SOPHIE, the fiber-link scrambling properties are one of the main conditions for high precision. To significantly improve the radial velocity precision of the SOPHIE spectrograph, which was limited to 5-6 ms(-1), we implemented a piece of octagonal-section fiber in the fiber link. We present here the scientific validation of the upgrade of this instrument, demonstrating a real improvement. The upgraded instrument, renamed SOPHIE+, reaches radial velocity precision in the range of 1-2 ms(-1). It is now fully efficient for the detection of low-mass exoplanets down to 5-10 M-circle plus and for the identification of acoustic modes down to a few tens of cm s(-1).
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