A new list of thorium and argon spectral lines in the visible
223 citations recorded by the source corpus.
Aims. We present a new list of thorium and argon emission lines in the visible obtained by analyzing high-resolution (R = 110 000) spectra of a ThAr hollow cathode lamp. The aim of this new line list is to allow significant improvements in the quality of wavelength calibration for medium- to high-resolution astronomical spectrographs. Methods. We use a series of ThAr lamp exposures obtained with the HARPS instrument (High Accuracy Radial-velocity Planet Searcher) to detect previously unknown lines, perform a systematic search for blended lines and correct individual wavelengths by determining the systematic offset of each line relative to the average wavelength solution. Results. We give updated wavelengths for more than 8400 lines over the spectral range 3785–6915 A. The typical internal uncertainty on the line positions is estimated to be ∼10 m s −1 (3.3 parts in 10 8 or 0.18 mA), which is a factor of 2–10 better than the widely used Los Alamos Atlas of the Thorium Spectrum (Palmer & Engleman 1983). The absolute accuracy of the global wavelength scale is the same as in the Los Alamos Atlas. Using this new line list on HARPS ThAr spectra, we are able to obtain a global wavelength calibration which is precise at the 20 cm s −1 level (6.7 parts in 10 10 or 0.0037 mA). Conclusions. Several research fields in astronomy requiring high-precision wavelength calibration in the visible (e.g. radial velocity planet searches, variability of fundamental constants) should benefit from using the new line list.
Subfields: Computational Mechanics, Mechanical Engineering, Statistics and Probability
View Paper: https://www.semanticscholar.org/paper/12aef027f998b34c1fab7b9aa375be45ca9057e3
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Citations in the corpus
- A dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zone (2013, background): “…Anglada-Escudé et al.: Three HZ super-Earths in a seven-planet system the necessary steps from 2D extraction of the echelle orders, flat and dark corrections, and accurate wavelength calibrationusing several hundreds of Th Ar lines accross the HARPS wavelength range (Lovis & Pepe 2007).”
- High‐precision calibration of spectrographs (2010, methodology): “In this work, we demonstrate that a precision spectrograph such as the High Accuracy Radial velocity Planet Searcher (HARPS, e.g. Mayor et al. 2003; Lovis & Pepe 2007) can be calibrated with significantly lower uncertainty using an LFC.”
- The HARPS search for southern extra-solar planets - XIII. A planetary system with 3 super-Earths (4.2, 6.9, and 9.2 M) (2008, background): “A global reanalysis of thorium lines positions based on many thousand HARPS spectra has allowed Lovis & Pepe (2007) to significantly improve the precision of thorium line wavelengths.”
- THE SDSS-III APOGEE SPECTRAL LINE LIST FOR H-BAND SPECTROSCOPY (2015, methodology): “In addition, the reference wavelengths for the Th and Ar lines usually employed for calibration come from vacuum-housed spectrographs, and are therefore more naturally used in vacuum (Norlén 1973; Palmer & Engleman 1983; Hinkle et al. 2001; Lovis & Pepe 2007; Kerber et al. 2008).”
- The HARPS search for southern extra-solar planets - XVII. Super-Earth and Neptune-mass planets in multiple planet systems HD 47 186 and HD 181 433 (2008, methodology): “…factors: 1) a careful and frequent monitoring of instrumental performances; 2) a continuous improvement of the data reduction software (e.g. Lovis & Pepe 2007); 3) a dedicated and careful observing strategy to deal with stellar seismic noise (e.g. Bouchy et al. 2005); 4) a long-duration…”
- DETECTING PLANETS AROUND VERY LOW MASS STARS WITH THE RADIAL VELOCITY METHOD (2009, background): “Of course, in a real spectrograph, effects like wavelength stability over time additionally limit the precision that can be reached (Lovis & Pepe 2007).”
- The HARPS search for southern extra-solar planets. XI. Super-Earths (5 and 8 M{⊕}) in a 3-planet system (2007, background): “We also took advantage of a concerted effort to improve the reduction pipeline with a special emphasis on wavelength calibration (Lovis & Pepe 2007).”
- Characterization of the K2-18 multi-planetary system with HARPS: A habitable zone super-Earth and discovery of a second, warm super-Earth on a non-coplanar orbit (2017, methodology): “The online HARPS pipeline returned the extracted, wavelength-calibrated spectra (Lovis & Pepe 2007).”