Trio of super-Earth candidates orbiting K-dwarf HD 48948: a new habitable zone candidate
Article
Dalal, S., Rescigno, F., Cretignier, M., John, A. Anna, Majidi, F. Z., Malavolta, L., Mortier, A., Pinamonti, M., Buchhave, L. A., Haywood, R. D., Sozzetti, A., Dumusque, X., Lienhard, F., Rice, K., Vanderburg, A., Lakeland, B., Bonomo, A. S., Collier Cameron, A., Damasso, M., ..., Wilson, T. G.. 2024. "Trio of super-Earth candidates orbiting K-dwarf HD 48948: a new habitable zone candidate." Monthly Notices of the Royal Astronomical Society. 531 (4), pp. 4464-4481. https://doi.org/10.1093/mnras/stae1367
Article Title | Trio of super-Earth candidates orbiting K-dwarf HD 48948: a new habitable zone candidate |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Dalal, S., Rescigno, F., Cretignier, M., John, A. Anna, Majidi, F. Z., Malavolta, L., Mortier, A., Pinamonti, M., Buchhave, L. A., Haywood, R. D., Sozzetti, A., Dumusque, X., Lienhard, F., Rice, K., Vanderburg, A., Lakeland, B., Bonomo, A. S., Collier Cameron, A., Damasso, M., Affer, L., Boschin, W., Cooke, B., Cosentino, R., Di Fabrizio, L., Ghedina, A., Harutyunyan, A., Latham, D. W., Lopez-Morales, M., Lovis, C., Martinez Fiorenzano, A., Mayor, M., Nicholson, B., Pepe, F., Stalport, M., Udry, S., Watson, C. A. and Wilson, T. G. |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 531 (4), pp. 4464-4481 |
Number of Pages | 18 |
Year | 2024 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stae1367 |
Web Address (URL) | https://academic.oup.com/mnras/article/531/4/4464/7696217 |
Abstract | We present the discovery of three super-Earth candidates orbiting HD 48948, a bright K-dwarf star with an apparent magnitude of mV = 8.58 mag. As part of the HARPS-N Rocky Planet Search programme, we collect 189 high-precision radial velocity measurements using the HARPS-N spectrograph from 2013 October 6, to 2023 April 16. Various methodologies are applied to extract the radial velocities from the spectra, and we conduct a comprehensive comparative analysis of the outcomes obtained through these diverse extraction techniques. To ensure the robustness of our findings, we employ several methods to address stellar variability, with a focus on Gaussian Process regression. To account for the impact of stellar variability and correlated noise in the radial velocity data set, we include activity indicators, such as log RH?K and bisector span, in the multidimensional Gaussian Process regression. Our analysis reveals three planetary candidates with orbital periods of 7.3, 38, and 151 d, and minimum masses estimated at 4.88 ± 0.21 M, 7.27 ± 0.70 M, and 10.59 ± 1.00 M, respectively. The outermost planet resides within the (temperate) habitable zone, positioned at a projected distance of 0.029 arcsec from its star. Given the close proximity of this planetary system, situated at a distance of 16.8 parsecs, HD 48498 emerges as a promising target (closest super-Earth around FGK stars) for future high-contrast direct imaging and high-resolution spectroscopic studies. © 2024 The Author(s). |
Keywords | instrumentation: spectrographs; techniques:radial velocities; planets and satellites: detection; stars: activity; methods:statistica; stars:rotation |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | University of Exeter, United Kingdom |
University of Oxford, United Kingdom | |
University of St Andrews, United Kingdom | |
University of Padua, Italy | |
INAF Observatory of Astrophysics and Space Science, Italy | |
Blue Skies Space, Italy | |
University of Birmingham, United Kingdom | |
Technical University of Denmark, Denmark | |
University of Geneva, Switzerland | |
University of Cambridge, United Kingdom | |
University of Edinburgh, United Kingdom | |
Massachusetts Institute of Technology, United States | |
Galileo Galilei Foundation - INAF, Spain | |
Instituto de Astrof´ısica de Canarias (IAC), Spain | |
University of La Laguna, Spain | |
University of Warwick, United Kingdom | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Centre for Astrophysics | |
University of Liege, Belgium | |
Queen’s University Belfast, United Kingdom |
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