The Pan-Pacific Planet Search - VIII. Complete results and the occurrence rate of planets around low-luminosity giants

Wittenmyer, Robert A. and Butler, R. P. and Horner, Jonathan and Clark, Jake and Tinney, C. G. and Carter, B. D. ORCID: https://orcid.org/0000-0003-0035-8769 and Wang, Liang and Johnson, John Asher and Collins, Michaela (2020) The Pan-Pacific Planet Search - VIII. Complete results and the occurrence rate of planets around low-luminosity giants. Monthly Notices of the Royal Astronomical Society, 491 (4). pp. 5248-5257. ISSN 0035-8711

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Abstract

Our knowledge of the populations and occurrence rates of planets orbiting evolved intermediate-mass stars lags behind that for solar-type stars by at least a decade. Some radial velocity surveys have targeted these low-luminosity giant stars, providing some insights into the properties of their planetary systems. Here, we present the final data release of the Pan-Pacific Planet Search (PPPS), a 5 yr radial velocity survey using the 3.9 m Anglo-Australian Telescope. We present 1293 precise radial velocity measurements for 129 stars, and highlight 6 potential substellar-mass companions, which require additional observations to confirm. Correcting for the substantial incompleteness in the sample, we estimate the occurrence rate of giant planets orbiting low-luminosity giant stars to be approximately 7.8^{+9.1}_{-3.3} per cent. This result is consistent with the frequency of such planets found to orbit main-sequence A-type stars, from which the PPPS stars have evolved.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to Published version 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: 15 Sep 2020 00:55
Last Modified: 30 Sep 2020 05:12
Uncontrolled Keywords: techniques: radial velocities; planets and satellites: detection; 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
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: https://doi.org/10.1093/mnras/stz3378
URI: http://eprints.usq.edu.au/id/eprint/39335

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