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

Robert A. Wittenmyer; Jake T. Clark; Sanjib Sharma; Dennis Stello; Jonathan Horner; Stephen R. Kane; Catherine P. Stevens; Duncan J. Wright; Lorenzo Spina; Klemen Čotar; Martin Asplund; Joss Bland-Hawthorn; Sven Buder; Andrew R. Casey; Gayandhi M. De Silva; Valentina D'Orazi; Ken Freeman; Janez Kos; Geraint Lewis; Jane Lin; Karin Lind; Sarah L. Martell; Jeffrey D. Simpson; Daniel B. Zucker; Tomaz Zwitter

doi:10.1093/mnras/staa1528

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

Robert A. Wittenmyer, Jake T. Clark, Sanjib Sharma, Dennis Stello, Jonathan Horner, Stephen R. Kane, Catherine P. Stevens, Duncan J. Wright, Lorenzo Spina, Klemen Čotar, Martin Asplund, Joss Bland-Hawthorn, Sven Buder, Andrew R. Casey, Gayandhi M. De Silva, Valentina D'Orazi, Ken Freeman, Janez Kos, Geraint Lewis, Jane LinKarin Lind, Sarah L. Martell, Jeffrey D. Simpson, Daniel B. Zucker, Tomaz Zwitter

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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 R ∼ 28000 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 _Jup. 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.

Original language	English
Pages (from-to)	851-863
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	496
Issue number	1
DOIs	https://doi.org/10.1093/mnras/staa1528
Publication status	Published - Jul 2020

Bibliographical note

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.

Keywords

planets and satellites: fundamental parameters
stars: fundamental parameters
techniques: spectroscopic

Access to Document

10.1093/mnras/staa1528

Publisher version (open access)Final published version, 1.1 MBLicence: Other

Cite this

Wittenmyer, R. A., Clark, J. T., Sharma, S., Stello, D., Horner, J., Kane, S. R., Stevens, C. P., Wright, D. J., Spina, L., Čotar, K., Asplund, M., Bland-Hawthorn, J., Buder, S., Casey, A. R., De Silva, G. M., D'Orazi, V., Freeman, K., Kos, J., Lewis, G., ... Zwitter, T. (2020). K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13. Monthly Notices of the Royal Astronomical Society, 496(1), 851-863. https://doi.org/10.1093/mnras/staa1528

@article{95d9379262954d97908ff5784fcf0d4e,

title = "K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13",

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 R ∼ 28000 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 Jup. 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. ",

keywords = "planets and satellites: fundamental parameters, stars: fundamental parameters, techniques: spectroscopic",

author = "Wittenmyer, \{Robert A.\} and Clark, \{Jake T.\} and Sanjib Sharma and Dennis Stello and Jonathan Horner and Kane, \{Stephen R.\} and Stevens, \{Catherine P.\} and Wright, \{Duncan J.\} and Lorenzo Spina and Klemen {\v C}otar and Martin Asplund and Joss Bland-Hawthorn and Sven Buder and Casey, \{Andrew R.\} and \{De Silva\}, \{Gayandhi M.\} and Valentina D'Orazi and Ken Freeman and Janez Kos and Geraint Lewis and Jane Lin and Karin Lind and Martell, \{Sarah L.\} and Simpson, \{Jeffrey D.\} and Zucker, \{Daniel B.\} and Tomaz Zwitter",

note = "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.",

year = "2020",

month = jul,

doi = "10.1093/mnras/staa1528",

language = "English",

volume = "496",

pages = "851--863",

journal = "Monthly Notices of the Royal Astronomical Society",

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Wittenmyer, RA, Clark, JT, Sharma, S, Stello, D, Horner, J, Kane, SR, Stevens, CP, Wright, DJ, Spina, L, Čotar, K, Asplund, M, Bland-Hawthorn, J, Buder, S, Casey, AR, De Silva, GM, D'Orazi, V, Freeman, K, Kos, J, Lewis, G, Lin, J, Lind, K, Martell, SL, Simpson, JD, Zucker, DB & Zwitter, T 2020, 'K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13', Monthly Notices of the Royal Astronomical Society, vol. 496, no. 1, pp. 851-863. https://doi.org/10.1093/mnras/staa1528

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T1 - K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13

AU - Wittenmyer, Robert A.

AU - Clark, Jake T.

AU - Sharma, Sanjib

AU - Stello, Dennis

AU - Horner, Jonathan

AU - Kane, Stephen R.

AU - Stevens, Catherine P.

AU - Wright, Duncan J.

AU - Spina, Lorenzo

AU - Čotar, Klemen

AU - Asplund, Martin

AU - Bland-Hawthorn, Joss

AU - Buder, Sven

AU - Casey, Andrew R.

AU - De Silva, Gayandhi M.

AU - D'Orazi, Valentina

AU - Freeman, Ken

AU - Kos, Janez

AU - Lewis, Geraint

AU - Lin, Jane

AU - Lind, Karin

AU - Martell, Sarah L.

AU - Simpson, Jeffrey D.

AU - Zucker, Daniel B.

AU - Zwitter, Tomaz

N1 - 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.

PY - 2020/7

Y1 - 2020/7

N2 - 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 ∼ 28000 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 Jup. 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.

AB - 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 ∼ 28000 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 Jup. 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.

KW - planets and satellites: fundamental parameters

KW - stars: fundamental parameters

KW - techniques: spectroscopic

UR - https://www.scopus.com/pages/publications/85088582948

UR - http://purl.org/au-research/grants/arc/DP150100250

UR - http://purl.org/au-research/grants/arc/DP160103747

UR - http://purl.org/au-research/grants/arc/CE170100013

U2 - 10.1093/mnras/staa1528

DO - 10.1093/mnras/staa1528

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JF - Monthly Notices of the Royal Astronomical Society

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