Analysis of the public HARPS/ESO spectroscopic archive: Ca II H&K time series for the HARPS radial velocity database

V. Perdelwitz; T. Trifonov; J. T. Teklu; K. R. Sreenivas; L. Tal-Or

doi:10.1051/0004-6361/202348263

Analysis of the public HARPS/ESO spectroscopic archive: Ca II H&K time series for the HARPS radial velocity database

V. Perdelwitz^*, T. Trifonov, J. T. Teklu, K. R. Sreenivas, L. Tal-Or

^*Corresponding author for this work

Department of Earth and Planetary Sciences

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Context. Magnetic activity is currently the primary limiting factor in radial velocity (RV) exoplanet searches. Even inactive stars, such as the Sun, exhibit RV jitter of the order of a few m s^-1 due to active regions on their surfaces. Time series of chromospheric activity indicators, such as the Ca II H&K lines, can be utilized to reduce the impact of such activity phenomena on exoplanet search programmes. In addition, the identification and correction of instrumental effects can improve the precision of RV exoplanet surveys. Aims. We aim to update the HARPS -RVBANK RV database and include an additional 3.5 yr of time series and Ca II H&K lines (R_HK) chromospheric activity indicators. This additional data will aid in the analysis of the impact of stellar magnetic activity on the RV time series obtained with the HARPS instrument. Our updated database aims to provide a valuable resource for the exoplanet community in understanding and mitigating the effects of such stellar magnetic activity on RV measurements. Methods. The new HARPS-RVBANK database includes all stellar spectra obtained with the HARPS instrument prior to January 2022. The RVs corrected for small but significant nightly zero-point variations were calculated using an established method. The R_HK estimates were determined from both individual spectra and co-added template spectra with the use of model atmospheres. As input for our derivation of R_HK, we derived stellar parameters from co-added, high signal-to-noise ratio templates for a total of 3230 stars using the stellar parameter code SPECIES. Results. The new version of the HARPS RV database has a total of 252 615 RVs of 5239 stars. Of these, 195 387 have R_HK values, which corresponds to 77% of all publicly available HARPS spectra. Currently, this is the largest public database of high-precision (down to ~1 m s^-1) RVs, and the largest compilation of R_HK measurements.

Original language	English
Article number	A125
Journal	Astronomy and Astrophysics
Volume	683
DOIs	https://doi.org/10.1051/0004-6361/202348263
Publication status	Published - 15 Mar 2024

Bibliographical note

V.P. acknowledges funding through the Kimmel prize fellowship of the Center for Earth and Planetary Science at the Weizmann Institute of Science, and the Dean’s fellowship of the faculty of chemistry (WIS). T.T. acknowledges support by the BNSF programme ‘VIHREN-2021’ project No. KP-06-DV-5/15.12.2021. T.T. acknowledges support by the DFG Research Unit FOR 2544 ‘Blue Planets around Red Stars’ project No. KU 3625/2-1. This work was also funded by the Israel Science Foundation through grant No. 1404/22.
Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
Publisher Copyright:
© 2024 EDP Sciences. All rights reserved.

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/202348263Licence: CC BY

Cite this

@article{0ec4daf2c90a4d54ac9fc29efdf267e1,

title = "Analysis of the public HARPS/ESO spectroscopic archive: Ca II H&K time series for the HARPS radial velocity database",

abstract = "Context. Magnetic activity is currently the primary limiting factor in radial velocity (RV) exoplanet searches. Even inactive stars, such as the Sun, exhibit RV jitter of the order of a few m s-1 due to active regions on their surfaces. Time series of chromospheric activity indicators, such as the Ca II H&K lines, can be utilized to reduce the impact of such activity phenomena on exoplanet search programmes. In addition, the identification and correction of instrumental effects can improve the precision of RV exoplanet surveys. Aims. We aim to update the HARPS -RVBANK RV database and include an additional 3.5 yr of time series and Ca II H&K lines (RHK) chromospheric activity indicators. This additional data will aid in the analysis of the impact of stellar magnetic activity on the RV time series obtained with the HARPS instrument. Our updated database aims to provide a valuable resource for the exoplanet community in understanding and mitigating the effects of such stellar magnetic activity on RV measurements. Methods. The new HARPS-RVBANK database includes all stellar spectra obtained with the HARPS instrument prior to January 2022. The RVs corrected for small but significant nightly zero-point variations were calculated using an established method. The RHK estimates were determined from both individual spectra and co-added template spectra with the use of model atmospheres. As input for our derivation of RHK, we derived stellar parameters from co-added, high signal-to-noise ratio templates for a total of 3230 stars using the stellar parameter code SPECIES. Results. The new version of the HARPS RV database has a total of 252 615 RVs of 5239 stars. Of these, 195 387 have RHK values, which corresponds to 77% of all publicly available HARPS spectra. Currently, this is the largest public database of high-precision (down to ~1 m s-1) RVs, and the largest compilation of RHK measurements.",

author = "V. Perdelwitz and T. Trifonov and Teklu, {J. T.} and Sreenivas, {K. R.} and L. Tal-Or",

note = "V.P. acknowledges funding through the Kimmel prize fellowship of the Center for Earth and Planetary Science at the Weizmann Institute of Science, and the Dean{\textquoteright}s fellowship of the faculty of chemistry (WIS). T.T. acknowledges support by the BNSF programme {\textquoteleft}VIHREN-2021{\textquoteright} project No. KP-06-DV-5/15.12.2021. T.T. acknowledges support by the DFG Research Unit FOR 2544 {\textquoteleft}Blue Planets around Red Stars{\textquoteright} project No. KU 3625/2-1. This work was also funded by the Israel Science Foundation through grant No. 1404/22. Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. Publisher Copyright: {\textcopyright} 2024 EDP Sciences. All rights reserved.",

year = "2024",

month = mar,

day = "15",

doi = "10.1051/0004-6361/202348263",

language = "English",

volume = "683",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

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TY - JOUR

T1 - Analysis of the public HARPS/ESO spectroscopic archive

T2 - Ca II H&K time series for the HARPS radial velocity database

AU - Perdelwitz, V.

AU - Trifonov, T.

AU - Teklu, J. T.

AU - Sreenivas, K. R.

AU - Tal-Or, L.

N1 - V.P. acknowledges funding through the Kimmel prize fellowship of the Center for Earth and Planetary Science at the Weizmann Institute of Science, and the Dean’s fellowship of the faculty of chemistry (WIS). T.T. acknowledges support by the BNSF programme ‘VIHREN-2021’ project No. KP-06-DV-5/15.12.2021. T.T. acknowledges support by the DFG Research Unit FOR 2544 ‘Blue Planets around Red Stars’ project No. KU 3625/2-1. This work was also funded by the Israel Science Foundation through grant No. 1404/22. Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. Publisher Copyright: © 2024 EDP Sciences. All rights reserved.

PY - 2024/3/15

Y1 - 2024/3/15

N2 - Context. Magnetic activity is currently the primary limiting factor in radial velocity (RV) exoplanet searches. Even inactive stars, such as the Sun, exhibit RV jitter of the order of a few m s-1 due to active regions on their surfaces. Time series of chromospheric activity indicators, such as the Ca II H&K lines, can be utilized to reduce the impact of such activity phenomena on exoplanet search programmes. In addition, the identification and correction of instrumental effects can improve the precision of RV exoplanet surveys. Aims. We aim to update the HARPS -RVBANK RV database and include an additional 3.5 yr of time series and Ca II H&K lines (RHK) chromospheric activity indicators. This additional data will aid in the analysis of the impact of stellar magnetic activity on the RV time series obtained with the HARPS instrument. Our updated database aims to provide a valuable resource for the exoplanet community in understanding and mitigating the effects of such stellar magnetic activity on RV measurements. Methods. The new HARPS-RVBANK database includes all stellar spectra obtained with the HARPS instrument prior to January 2022. The RVs corrected for small but significant nightly zero-point variations were calculated using an established method. The RHK estimates were determined from both individual spectra and co-added template spectra with the use of model atmospheres. As input for our derivation of RHK, we derived stellar parameters from co-added, high signal-to-noise ratio templates for a total of 3230 stars using the stellar parameter code SPECIES. Results. The new version of the HARPS RV database has a total of 252 615 RVs of 5239 stars. Of these, 195 387 have RHK values, which corresponds to 77% of all publicly available HARPS spectra. Currently, this is the largest public database of high-precision (down to ~1 m s-1) RVs, and the largest compilation of RHK measurements.

AB - Context. Magnetic activity is currently the primary limiting factor in radial velocity (RV) exoplanet searches. Even inactive stars, such as the Sun, exhibit RV jitter of the order of a few m s-1 due to active regions on their surfaces. Time series of chromospheric activity indicators, such as the Ca II H&K lines, can be utilized to reduce the impact of such activity phenomena on exoplanet search programmes. In addition, the identification and correction of instrumental effects can improve the precision of RV exoplanet surveys. Aims. We aim to update the HARPS -RVBANK RV database and include an additional 3.5 yr of time series and Ca II H&K lines (RHK) chromospheric activity indicators. This additional data will aid in the analysis of the impact of stellar magnetic activity on the RV time series obtained with the HARPS instrument. Our updated database aims to provide a valuable resource for the exoplanet community in understanding and mitigating the effects of such stellar magnetic activity on RV measurements. Methods. The new HARPS-RVBANK database includes all stellar spectra obtained with the HARPS instrument prior to January 2022. The RVs corrected for small but significant nightly zero-point variations were calculated using an established method. The RHK estimates were determined from both individual spectra and co-added template spectra with the use of model atmospheres. As input for our derivation of RHK, we derived stellar parameters from co-added, high signal-to-noise ratio templates for a total of 3230 stars using the stellar parameter code SPECIES. Results. The new version of the HARPS RV database has a total of 252 615 RVs of 5239 stars. Of these, 195 387 have RHK values, which corresponds to 77% of all publicly available HARPS spectra. Currently, this is the largest public database of high-precision (down to ~1 m s-1) RVs, and the largest compilation of RHK measurements.

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DO - 10.1051/0004-6361/202348263

M3 - Article

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SN - 0004-6361

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JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A125

ER -

Analysis of the public HARPS/ESO spectroscopic archive: Ca II H&K time series for the HARPS radial velocity database

Abstract

Bibliographical note

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