Four Jovian planets around low-luminosity giant stars observed by the EXPRESS and PPPS
Article
Article Title | Four Jovian planets around low-luminosity giant stars observed by the EXPRESS and PPPS |
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ERA Journal ID | 1050 |
Article Category | Article |
Authors | Jones, M. I. (Author), Wittenmyer, R. (Author), Aguilera-Gomez, C. (Author), Soto, M. G. (Author), Torres, P. (Author), Trifonov, T. (Author), Jenkins, J. S. (Author), Zapata, A. (Author), Sarkis, P. (Author), Zakhozhay, O. (Author), Brahm, R. (Author), Ramirez, R. (Author), Santana, F. (Author), Vines, J. I. (Author), Diaz, M. R. (Author), Vuckovic, M. (Author) and Pantoja, B. (Author) |
Journal Title | Astronomy and Astrophysics: a European journal |
Journal Citation | 646, pp. 1-12 |
Article Number | A131 |
Number of Pages | 12 |
Year | 2021 |
Publisher | EDP Sciences |
Place of Publication | France |
ISSN | 0004-6361 |
1432-0746 | |
Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/202038555 |
Web Address (URL) | https://www.aanda.org/articles/aa/abs/2021/02/aa38555-20/aa38555-20.html |
Abstract | We report the discovery of planetary companions orbiting four low-luminosity giant stars with M⋆ between 1.04 and 1.39 M⊙. All four host stars have been independently observed by the EXoPlanets aRound Evolved StarS (EXPRESS) program and the Pan-Pacific Planet Search (PPPS). The companion signals were revealed by multi-epoch precision radial velocities obtained in nearly a decade. The planetary companions exhibit orbital periods between ~1.2 and 7.1 yr, minimum masses of mpsin i ~ 1.8–3.7 MJ, and eccentricities between 0.08 and 0.42. With these four new systems, we have detected planetary companions to 11 out of the 37 giant stars that are common targets in the EXPRESS and PPPS. After excluding four compact binaries from the common sample, we obtained a fraction of giant planets (mp ≳ 1– 2 MJ) orbiting within 5 AU from their parent star of f = 33.3−7.1+9.0%. This fraction is slightly higher than but consistent at the 1σ level with previous results obtained by different radial velocity surveys. Finally, this value is substantially higher than the fraction predicted by planet formation models of gas giants around stars more massive than the Sun. |
Keywords | asteroseismology; techniques: radial velocities; planets and; satellites: detection; planets and satellites: formation; Astrophysics -; Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar; Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | European Southern Observatory (ESO), Chile |
Centre for Astrophysics | |
Andres Bello National University, Chile | |
Queen Mary University of London, United Kingdom | |
Pontifical Catholic University of Chile, Chile | |
Max Planck Society, Germany | |
University of Chile, Chile | |
Adolfo Ibanez University, Chile | |
University of Valparaiso, Chile | |
Bucknell University, United States |
https://research.usq.edu.au/item/q6x85/four-jovian-planets-around-low-luminosity-giant-stars-observed-by-the-express-and-ppps
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