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Table 1
Basic characteristics of the HARPS observations of the three target stars.
| Dates | ||||||
| Target | N | Nnights | start | end | time span [yr] | ⟨ S/N ⟩ 550 nm |
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|
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| HD 1461 | 448 | 249 | 2003-09-16 | 2013-11-28 | 10.2 | 277 |
| HD 40307 | 441 | 226 | 2003-10-29 | 2014-04-05 | 10.4 | 246 |
| HD 204313 | 96 | 95 | 2006-05-05 | 2014-10-17 | 8.5 | 151 |
Notes. N is the total number of spectra, and Nnights is the total number of nights on which the target was observed. The average signal-to-noise ratio (⟨S/N⟩) is computed over the nightly average spectra at 550 nm.
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