Search: onr:"swepub:oai:research.chalmers.se:97fdb929-51ee-4e14-9317-9bf4a55ebe26" >
Super-Earth of 8 Me...
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Persson, Carina,1964Chalmers tekniska högskola,Chalmers University of Technology
(author)
Super-Earth of 8 Mearth in a 2.2-day orbit around the K5V star K2-216
- Article/chapterEnglish2018
Publisher, publication year, extent ...
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2018-10-10
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EDP Sciences,2018
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electronicrdacarrier
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LIBRIS-ID:oai:research.chalmers.se:97fdb929-51ee-4e14-9317-9bf4a55ebe26
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https://doi.org/10.1051/0004-6361/201832867DOI
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https://research.chalmers.se/publication/505329URI
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https://research.chalmers.se/publication/505746URI
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https://research.chalmers.se/publication/506292URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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Although thousands of exoplanets have been discovered to date, far fewer have been fully characterised, in particular super- Earths. The KESPRINT consortium identified K2-216 as a planetary candidate host star in the K2 space mission Campaign 8 field with a transiting super-Earth. The planet has recently been validated as well. Our aim was to confirm the detection and derive the main physical characteristics of K2-216b, including the mass. We performed a series of follow-up observations: high resolution imaging with the FastCam camera at the TCS, the Infrared Camera and Spectrograph at Subaru, and high resolution spectroscopy with HARPS (ESO, La Silla), HARPS-N (TNG), and FIES (NOT). The stellar spectra were analyzed with the SpecMatch-Emp and SME codes to derive the stellar fundamental properties. We analyzed the K2 light curve with the Pyaneti software. The radial-velocity measurements were modelled with both a Gaussian process (GP) regression and the floating chunk offset (FCO) technique to simultaneously model the planetary signal and correlated noise associated with stellar activity. Imaging confirms that K2-216 is a single star. Our analysis discloses that the star is a moderately active K5V star of mass 0.70+/-0.03 Msun and radius 0.72+/-0.03 Rsun. Planet b is found to have a radius of 1.75+0.17-0.10 Rearth and a 2.17-day orbit in agreement with previous results. We find consistent results for the planet mass from both models: 7.4+/-2.2 Mearth from the GP regression, and 8.0+/-1.6 Mearth from the FCO technique, which implies that this planet is a super-Earth. The planet parameters put planet b in the middle of, or just below, the gap of the radius distribution of small planets. The density is consistent with a rocky composition of primarily iron and magnesium silicate. In agreement with theoretical predictions, we find that the planet is a remnant core, stripped of its atmosphere, and is one of the largest planets found that has lost its atmosphere.
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Fridlund, Malcolm,1952Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)malfri
(author)
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Barragan, O.
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Dai, F.
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Gandolfi, D.
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Hatzes, A. P.
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Hirano, T.
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Grziwa, S.
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Korth, J.
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Prieto-Arranz, J.
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Fossati, L.
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Van Eylen, V.
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Justesen, A. Bo
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Livingston, J.
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Kubyshkina, D.
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Deeg, H. J.
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Guenther, E. W.
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Nowak, G.
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Cabrera, J.
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Eigmüller, Ph
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Csizmadia, Sz.
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Smith, A. M. S.
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Erikson, A.
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Albrecht, S.
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Alonso, R.
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Cochran, W. D.
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Endl, M.
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Esposito, M.
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Fukui, A.
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Heeren, P.
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Hidalgo, D.
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Hjorth, M.
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Kuzuhara, M.
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Narita, N.
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Nespral, D.
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Palle, E.
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Pätzold, M.
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Rauer, H.
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Rodler, F.
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Winn, J. N.
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Chalmers tekniska högskola
(creator_code:org_t)
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In:Astronomy and Astrophysics: EDP Sciences618:330004-63611432-0746
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Persson, Carina, ...
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Fridlund, Malcol ...
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Barragan, O.
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Dai, F.
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Gandolfi, D.
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Hatzes, A. P.
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Hirano, T.
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Grziwa, S.
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Korth, J.
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Prieto-Arranz, J ...
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Fossati, L.
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Van Eylen, V.
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Justesen, A. Bo
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Livingston, J.
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Kubyshkina, D.
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Deeg, H. J.
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Guenther, E. W.
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Nowak, G.
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Cabrera, J.
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Eigmüller, Ph
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Csizmadia, Sz.
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Smith, A. M. S.
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Erikson, A.
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Albrecht, S.
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Alonso, R.
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Cochran, W. D.
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Endl, M.
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Esposito, M.
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Fukui, A.
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Heeren, P.
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Hidalgo, D.
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Hjorth, M.
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Kuzuhara, M.
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Narita, N.
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Nespral, D.
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Palle, E.
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Pätzold, M.
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Rauer, H.
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Rodler, F.
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Winn, J. N.
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