An updated catalog of HIRES/Keck radial velocity measurements. Including Ca II H&K measurements
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916939006214144 |
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| author | Teklu, Jerusalem T. Perdelwitz, Volker Butler, R. Paul Trifonov, Trifon Vogt, Steven S. Mukhija, Deepa Tal-Or, Lev |
| author_facet | Teklu, Jerusalem T. Perdelwitz, Volker Butler, R. Paul Trifonov, Trifon Vogt, Steven S. Mukhija, Deepa Tal-Or, Lev |
| contents | The first HIRES/Keck precision radial velocity (RV) catalog was released in 2017; it was followed by a second release in 2019, which incorporated corrections for small but significant systematic errors. The manifestation of stellar activity accompanied by systematic errors could affect the detection of exoplanets via the RV method. We expanded the HIRES catalog to March 2023 using publicly available spectra. Furthermore, we included the chromospheric emission line Ca II H&K indicator ($R_{\mathrm{HK}}^\prime$), which is among the most prominent tracers of stellar activity. The precision RVs were obtained using an iodine gas absorption cell and corrected for minor systematic errors. $R_{\mathrm{HK}}^\prime$ measurements were derived by rectifying the observed spectra with PHOENIX synthetic spectra models in six narrow bands surrounding the H and K lines, then subtracting the photospheric contribution. We present an updated HIRES/Keck precision RV catalog featuring 78,920 RV measurements for 1,702 stars. High-quality $R_{\mathrm{HK}}^\prime$ measurements are provided for ~ 40% of the HIRES catalog. The updated catalog can help distinguish stellar activity effects from planetary signals in RV time series, thereby corroborating previously detected planetary candidates and aiding in the detection of new ones. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_06072 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | An updated catalog of HIRES/Keck radial velocity measurements. Including Ca II H&K measurements Teklu, Jerusalem T. Perdelwitz, Volker Butler, R. Paul Trifonov, Trifon Vogt, Steven S. Mukhija, Deepa Tal-Or, Lev Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics The first HIRES/Keck precision radial velocity (RV) catalog was released in 2017; it was followed by a second release in 2019, which incorporated corrections for small but significant systematic errors. The manifestation of stellar activity accompanied by systematic errors could affect the detection of exoplanets via the RV method. We expanded the HIRES catalog to March 2023 using publicly available spectra. Furthermore, we included the chromospheric emission line Ca II H&K indicator ($R_{\mathrm{HK}}^\prime$), which is among the most prominent tracers of stellar activity. The precision RVs were obtained using an iodine gas absorption cell and corrected for minor systematic errors. $R_{\mathrm{HK}}^\prime$ measurements were derived by rectifying the observed spectra with PHOENIX synthetic spectra models in six narrow bands surrounding the H and K lines, then subtracting the photospheric contribution. We present an updated HIRES/Keck precision RV catalog featuring 78,920 RV measurements for 1,702 stars. High-quality $R_{\mathrm{HK}}^\prime$ measurements are provided for ~ 40% of the HIRES catalog. The updated catalog can help distinguish stellar activity effects from planetary signals in RV time series, thereby corroborating previously detected planetary candidates and aiding in the detection of new ones. |
| title | An updated catalog of HIRES/Keck radial velocity measurements. Including Ca II H&K measurements |
| topic | Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2509.06072 |