Sub-m s<superscript>−1</superscript> upper limits from a deep HARPS-N radial-velocity search for planets orbiting HD 166620 and HD 144579.
In: Monthly Notices of the Royal Astronomical Society, Jg. 525 (2023-10-20), Heft 2, S. 1687-1704
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Zugriff:
Minimizing the impact of stellar variability in radial velocity (RV) measurements is a critical challenge in achieving the 10 cm s−1 precision needed to hunt for Earth twins. Since 2012, a dedicated programme has been underway with HARPS-N, to conduct a blind RV rocky planets search (RPS) around bright stars in the Northern hemisphere. Here we describe the results of a comprehensive search for planetary systems in two RPS targets, HD 166620 and HD 144579. Using wavelength-domain line-profile decorrelation vectors to mitigate the stellar activity and performing a deep search for planetary reflex motions using a trans-dimensional nested sampler, we found no significant planetary signals in the data sets of either of the stars. We validated the results via data-splitting and injection recovery tests. Additionally, we obtained the 95th percentile detection limits on the HARPS-N RVs. We found that the likelihood of finding a low-mass planet increases noticeably across a wide period range when the inherent stellar variability is corrected for using scalpels U -vectors. We are able to detect planet signals with M sin i ≤ 1 M⊕ for orbital periods shorter than 10 d. We demonstrate that with our decorrelation technique, we are able to detect signals as low as 54 cm s−1, which brings us closer to the calibration limit of 50 cm s−1 demonstrated by HARPS-N. Therefore, we show that we can push down towards the RV precision required to find Earth analogues using high-precision radial velocity data with novel data-analysis techniques. [ABSTRACT FROM AUTHOR]
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Sub-m s<superscript>−1</superscript> upper limits from a deep HARPS-N radial-velocity search for planets orbiting HD 166620 and HD 144579.
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Autor/in / Beteiligte Person: | Anna John, A ; Collier Cameron, A ; Faria, J P ; Mortier, A ; Wilson, T G ; Malavolta, L ; Buchhave, L A ; Dumusque, X ; López-Morales, M ; Haywood, R D ; Rice, K ; Sozzetti, A ; Latham, D W ; Udry, S ; Pepe, F ; Pinamonti, M ; Vanderburg, A ; Ghedina, A ; Cosentino, R ; Stalport, M |
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Zeitschrift: | Monthly Notices of the Royal Astronomical Society, Jg. 525 (2023-10-20), Heft 2, S. 1687-1704 |
Veröffentlichung: | 2023 |
Medientyp: | academicJournal |
ISSN: | 0035-8711 (print) |
DOI: | 10.1093/mnras/stad2381 |
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