2020/05/22 by Robert A. Wittenmyer, Jake Clark, Jake T. Clark +36 · 10 citations
Physics and Astronomy · #Astrobiology #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Physics #Planet #Stellar, planetary, and galactic studies #astro-ph.EP #astro-ph.GA #astro-ph.SR
paper · pdf · doi:10.1093/mnras/staa1528
published in Monthly Notices of the Royal Astronomical Society 496(1), 851-863 (Oxford University Press) · Accepted for publication in MNRAS. Full versions of online-only Tables 2 and 3 available on request. Same for Table 4, in exchange for the trick to make MNRAS style break long tables across pages
arxiv created 2020/05/22 · openalex publication_date 2020/06/02 · arxiv updated 2020/06/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
ABSTRACT Accurate and precise radius estimates of transiting exoplanets are critical for understanding their compositions and formation mechanisms. To know the planet, we must know the host star in as much detail as possible. We present complete results for planet-candidate hosts from the K2-HERMES survey, which uses the HERMES multi-object spectrograph on the Anglo-Australian Telescope to obtain R∼ 28 000 spectra for more than 30 000 K2 stars. We present complete host-star parameters and planet-candidate radii for 224 K2 candidate planets from C1–C13. Our results cast severe doubt on 30 K2 candidates, as we derive unphysically large radii, larger than 2RJup. This work highlights the importance of obtaining accurate, precise, and self-consistent stellar parameters for ongoing large planet search programs – something that will only become more important in the coming years, as TESS begins to deliver its own harvest of exoplanets.