The K2-HERMES Survey. I. Planet-candidate Properties from K2 Campaigns 1–3

Wittenmyer, Robert A. and Sharma, Sanjib and Stello, Dennis and Buder, Sven and Kos, Janez and Asplund, Martin and Duong, Ly and Lin, Jane and Lind, Karin and Ness, Melissa and Zwitter, Tomaz and Horner, Jonathan and Clark, Jake and Kane, Stephen R. and Huber, Daniel and Bland-Hawthorn, Joss and Casey, Andrew R. and de Silva, Gayandhi M. and D’Orazi, Valentina and Freeman, Ken and Martell, Sarah and Simpson, Jeffrey D. and Zucker, Daniel B. and Anguiano, Borja and Casagrande, Luca and Esdaile, James and Hon, Marc and Ireland, Michael and Kafle, Prajwal R. and Khanna, Shourya and Marshall, J. P. and Saddon, Mohd Hafiz Mohd and Traven, Gregor and Wright, Duncan (2018) The K2-HERMES Survey. I. Planet-candidate Properties from K2 Campaigns 1–3. The Astronomical Journal, 155 (2):84. pp. 1-10. ISSN 0004-6256


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 first results from the K2-HERMES project, which uses the HERMES multi-object spectrograph on the Anglo-Australian Telescope to obtain R ∼ 28000 spectra of up to 360 stars in one exposure. This ongoing project aims to derive self-consistent spectroscopic parameters for about half of K2 target stars. We present complete stellar parameters and isochrone-derived masses and radii for 46 stars hosting 57 K2 candidate planets in Campaigns 1-3. Our revised host-star radii cast severe doubt on three candidate planets: EPIC 201407812.01, EPIC 203070421.01, and EPIC 202843107.01, all of which now have inferred radii well in excess of the largest known inflated Jovian planets.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 02 Oct 2018 04:30
Last Modified: 27 May 2021 01:28
Uncontrolled Keywords: planets and satellites; stars; fundamental parameters; spectroscopic
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020108 Planetary Science (excl. Extraterrestrial Geology)
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5199 Other physical sciences > 519999 Other physical sciences not elsewhere classified
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