K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13,Monthly Notices of the Royal Astronomical Society

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K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13
Monthly Notices of the Royal Astronomical Society ( IF 4.7 ) Pub Date : 2020-06-03 , DOI: 10.1093/mnras/staa1528
Robert A Wittenmyer ₁ , Jake T Clark ₁ , Sanjib Sharma ₂ , Dennis Stello ₃ , Jonathan Horner ₁ , Stephen R Kane ₄ , Catherine P Stevens ₅ , Duncan J Wright ₁ , Lorenzo Spina ₆ , Klemen Čotar ₇ , Martin Asplund ₈ , Joss Bland-Hawthorn ₂ , Sven Buder _{8,

9,

10} , Andrew R Casey ₆ , Gayandhi M De Silva ₂ , Valentina D’Orazi ₁₁ , Ken Freeman ₈ , Janez Kos ₂ , Geraint Lewis ₂ , Jane Lin ₂ , Karin Lind _{10,

12} , Sarah L Martell _{3,

9} , Jeffrey D Simpson ₃ , Daniel B Zucker _{13,

14} , Tomaz Zwitter ₇

Affiliation

University of Southern Queensland, Centre for Astrophysics, USQ Toowoomba, Toowoomba, QLD 4350, Australia
Sydney Institute for Astronomy, School of Physics, University of Sydney, Sydney, NSW 2006, Australia
School of Physics, University of New South Wales, Sydney, NSW 2052, Australia
Department of Earth and Planetary Sciences, University of California, Riverside, CA 92521, USA
Department of Physics, Westminster College, New Wilmington, PA 16172, USA
Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, Monash, VIC 3800, Australia
Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Canberra, ACT 2611, Australia
Max Planck Institute for Astronomy (MPIA), Koenigstuhl 17, D-69117 Heidelberg, Germany
INAF Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, I-35122 Padova, Italy
Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia
Research Centre in Astronomy, Astrophysics and Astrophotonics, Macquarie University, Sydney, NSW 2109, Australia

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 $R\sim 28\, 000$ 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.

中文翻译：

K2-爱马仕II。来自 K2 活动 1-13 的行星候选属性

准确和精确地估计凌日系外行星的半径对于理解它们的组成和形成机制至关重要。要了解这颗行星，我们必须尽可能详细地了解主恒星。我们提供了来自 K2-HERMES 调查的行星候选宿主的完整结果，该调查使用英澳望远镜上的 HERMES 多目标光谱仪获得超过 30 000 颗 K2 恒星的 $R\sim 28\, 000$ 光谱。我们提供了来自 C1-C13 的 224 颗 K2 候选行星的完整主星参数和行星候选半径。我们的结果对 30 个 K2 候选者产生了严重怀疑，因为我们得出了非物理大半径，大于 2RJup。这项工作强调了获得准确、精确、

更新日期：2020-06-03

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