K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13

Wittenmyer, Robert A. and Clark, Jake T. and Sharma, Sanjib and Stello, Dennis and Horner, Jonathan and Kane, Stephen R. and Stevens, Catherine P. and Wright, Duncan J. and Spina, Lorenzo and Cotar, Klemen and Asplund, Martin and Bland-Hawthorn, Joss and Buder, Sven and Casey, Andrew R. and de Silva, Gayandhi M. and D'Orazi, Valentina and Freeman, Ken and Kos, Janez and Lewis, Geraint and Lin, Jane and Lind, Karin and Martell, Sarah L. and Simpson, Jeffrey D. and Zucker, Daniel B. and Zwitter, Tomaz (2020) K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13. Monthly Notices of the Royal Astronomical Society, 496 (1). pp. 851-863. ISSN 0035-8711

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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 &lt;inline-formla&gt;$R\sim 28\, 000$ 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 2R<SUB>Jup</SUB>. 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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 496, Issue 1, July 2020, Pages 851–863, https://doi.org/10.1093/mnras/staa1528. Copyright 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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: 28 Aug 2020 01:54
Last Modified: 31 Aug 2020 04:50
Uncontrolled Keywords: techniques: spectroscopic; planets and satellites: fundamental; parameters; stars: fundamental parameters; Astrophysics - Earth and; Planetary Astrophysics; Astrophysics - Astrophysics of Galaxies; 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/staa1528
URI: http://eprints.usq.edu.au/id/eprint/39329

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