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The K2-HERMES Survey. I. Planet-candidate Properties from K2 Campaigns 1-3
Univ Southern Queensland, Computat Engn & Sci Res Ctr, Toowoomba, Qld 4350, Australia.;Univ New South Wales, Australian Ctr Astrobiol, Sydney, NSW 2052, Australia..
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia..
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia.;Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, DK-8000 Aarhus C, Denmark..
MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany.;Heidelberg Univ, Int Max Planck Res Sch Astron Cosm Phys, Heidelberg, Germany..
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2018 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 155, no 2, article id 84Article in journal (Refereed) Published
Abstract [en]

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 similar to 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.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2018. Vol. 155, no 2, article id 84
Keywords [en]
planets and satellites: fundamental parameters, stars: fundamental parameters, techniques: spectroscopic
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-343775DOI: 10.3847/1538-3881/aaa3e4ISI: 000423447200003OAI: oai:DiVA.org:uu-343775DiVA, id: diva2:1187910
Funder
Australian Research Council, FT1400147, FT160100402, DE140100598Available from: 2018-03-06 Created: 2018-03-06 Last updated: 2018-03-06Bibliographically approved

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Lind, Karin

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