Three years of HARPS-N high-resolution spectroscopy and precise radial velocity data for the Sun
Three years of HARPS-N high-resolution spectroscopy and precise radial velocity data for the Sun
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三年的 HARPS-N 高分辨率光谱和精确的太阳径向速度数据
DOI:
10.1051/0004-6361/202039350
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发表时间:
2021
影响因子:
6.5
通讯作者:
Dumusque X
中科院分区:
文献类型:
--
作者:
Dumusque X
ContextThe solar telescope connected to HARPS-N has been observing the Sun since the summer of 2015. Such a high-cadence, long-baseline data set is crucial for understanding spurious radial-velocity signals induced by our Sun and by the instrument. On the instrumental side, this data set allowed us to detect sub- m s−1systematics that needed to be corrected for.AimsThe goals of this manuscript are to (i) present a new data reduction software for HARPS-N, (ii) demonstrate the improvement brought by this new software during the first three years of the HARPS-N solar data set, and (iii) release all the obtained solar products, from extracted spectra to precise radial velocities.MethodsTo correct for the instrumental systematics observed in the data reduced with the current version of the HARPS-N data reduction software (DRS version 3.7), we adapted the newly available ESPRESSO DRS (version 2.2.3) to HARPS-N and developed new optimised recipes for the spectrograph. We then compared the first three years of HARPS-N solar data reduced with the current and new DRS.ResultsThe most significant improvement brought by the new DRS is a strong decrease in the day-to-day radial-velocity scatter, from 1.27 to 1.07 m s−1; this is thanks to a more robust method to derive wavelength solutions, but also to the use of calibrations closer in time. The newly derived solar radial-velocities are also better correlated with the chromospheric activity level of the Sun in the long term, with a Pearson correlation coefficient of 0.93 compared to 0.77 before, which is expected from our understanding of stellar signals. Finally, we also discuss how HARPS-N spectral ghosts contaminate the measurement of the calcium activity index, and we present an efficient technique to derive an index free of instrumental systematics.ConclusionsThis paper presents a new data reduction software for HARPS-N and demonstrates its improvements, mainly in terms of radial-velocity precision, when applied to the first three years of the HARPS-N solar data set. Those newly reduced solar data, representing an unprecedented time series of 34 550 high-resolution spectra and precise radial velocities, are released alongside this paper. Those data are crucial to understand stellar activity signals in solar-type stars further and develop the mitigating techniques that will allow us to detect other Earths.
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DOI:
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发表时间:
2008
期刊:
影响因子:
--
作者:
S. Lefebvre;R. A. García;S. Jiménez;S. Turck;S. Mathur;S. Mathur
通讯作者:
S. Mathur
影响因子:
0.9
作者:
K. Strassmeier;I. Ilyin;A. Jarvinen;M. Weber;M. Woche;S. Barnes;S. Bauer;E. Beckert;W. Bittner;R. Bredthauer;T. Carroll;C. Denker;F. Dionies;I. DiVarano;D. Doscher;T. Fechner;D. Feuerstein;T. Granzer;T. Hahn;G. Harnisch;A. Hofmann;M. Lesser;J. Paschke;S. Pankratow;V. Plank;D. Pluschke;E. Popow;D. Sablowski;J. Storm
通讯作者:
J. Storm
影响因子:
6.5
作者:
M. Desort;A. Lagrange;F. Galland;S. Udry;M. Mayor
通讯作者:
M. Desort;A. Lagrange;F. Galland;S. Udry;M. Mayor
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
F. Pepe;M. Mayor;F. Galland;D. Naef;D. Queloz;N. Santos;S. Udry;M. Burnet
通讯作者:
M. Burnet
影响因子:
6.5
作者:
N. Meunier;A. Lagrange;M. Desort
通讯作者:
M. Desort