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

Wittenmyer, Robert A.; Sharma, Sanjib; Stello, Dennis; Buder, Sven; Kos, Janez; Asplund, Martin; Duong, Ly; Lin, Jane; Lind, Karin and Ness, Melissa, et al. (2018) In Astronomical Journal 155(2).
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 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:... (More)

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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@article{24efa3c4-341d-40d5-aba2-478719daaa67,
  abstract     = {<p>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.</p>},
  articleno    = {84},
  author       = {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 Mohd Saddon, Mohd Hafiz and Traven, Gregor and Wright, Duncan},
  issn         = {0004-6256},
  keyword      = {planets and satellites: fundamental parameters,stars: fundamental parameters,techniques: spectroscopic},
  language     = {eng},
  month        = {02},
  number       = {2},
  publisher    = {The American Astronomical Society},
  series       = {Astronomical Journal},
  title        = {The K2-HERMES Survey. I. Planet-candidate Properties from K2 Campaigns 1-3},
  url          = {http://dx.doi.org/10.3847/1538-3881/aaa3e4},
  volume       = {155},
  year         = {2018},
}