Four Jovian planets around low-luminosity giant stars observed by the EXPRESS and PPPS

Jones, M. I. and Wittenmyer, R. and Aguilera-Gomez, C. and Soto, M. G. and Torres, P. and Trifonov, T. and Jenkins, J. S. and Zapata, A. and Sarkis, P. and Zakhozhay, O. and Brahm, R. and Ramirez, R. and Santana, F. and Vines, J. I. and Diaz, M. R. and Vuckovic, M. and Pantoja, B. (2021) Four Jovian planets around low-luminosity giant stars observed by the EXPRESS and PPPS. Astronomy and Astrophysics, 646:A131. pp. 1-12. ISSN 0004-6361

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 10 Jan 2022 01:30
Last Modified: 13 Jan 2022 05:11
Uncontrolled Keywords: asteroseismology; techniques: radial velocities; planets and; satellites: detection; planets and satellites: formation; Astrophysics -; Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar; Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1051/0004-6361/202038555
URI: http://eprints.usq.edu.au/id/eprint/45061

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