Sub-m s-1upper limits from a deep HARPS-N radial-velocity search for planets orbiting HD 166620 and HD 144579
Article
John, A. Anna, Collier Cameron, A., Faria, J. P., Mortier, A., Wilson, T. G., Malavolta, L., Buchhave, L. A., Dumusque, X., Lopez-Morales, M., Haywood, R. D., Rice, K., Sozzetti, A., Latham, D. W., Udry, S., Pepe, F., Pinamonti, M., Vanderburg, A., Ghedina, A., Cosentino, R., ..., Poretti, E.. 2023. "Sub-m s-1upper limits from a deep HARPS-N radial-velocity search for planets orbiting HD 166620 and HD 144579." Monthly Notices of the Royal Astronomical Society. 525 (2), pp. 1687-1704. https://doi.org/10.1093/mnras/stad2381
Article Title | Sub-m s-1upper limits from a deep HARPS-N radial-velocity search for planets orbiting HD 166620 and HD 144579 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | John, A. Anna, Collier Cameron, A., Faria, J. P., Mortier, A., Wilson, T. G., Malavolta, L., Buchhave, L. A., Dumusque, X., Lopez-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., Nicholson, B. A., Martinez Fiorenzano, A. and Poretti, E. |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 525 (2), pp. 1687-1704 |
Number of Pages | 18 |
Year | 2023 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stad2381 |
Web Address (URL) | https://academic.oup.com/mnras/article/525/2/1687/7237487 |
Abstract | 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 scalpelsU-vectors. We are able to detect planet signals with Msin 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. © The Author(s) 2023. |
Keywords | line: profiles; techniques: radial velocities; stars: activity; planets and satellites: detection |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | University of St Andrews, United Kingdom |
University of Porto, Portugal | |
University of Birmingham, United Kingdom | |
University of Padova, Italy | |
INAF - Astronomical Observatory of Padova, Italy | |
University of Denmark, Denmark | |
University of Geneva, Switzerland | |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of Exeter, United Kingdom | |
University of Edinburgh, United Kingdom | |
INAF - Astrophysical Observatory of Turin, Italy | |
Massachusetts Institute of Technology, United States | |
Galileo Galilei Foundation - INAF, Spain | |
University of Liege, Belgium | |
University of Oxford, United Kingdom | |
Centre for Astrophysics |
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