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Super-Earth of 8 Me...
Super-Earth of 8 Mearth in a 2.2-day orbit around the K5V star K2-216
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- Persson, Carina, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Fridlund, Malcolm, 1952 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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Barragan, O. (author)
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Dai, F. (author)
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Gandolfi, D. (author)
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Hatzes, A. P. (author)
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Hirano, T. (author)
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Grziwa, S. (author)
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Korth, J. (author)
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Prieto-Arranz, J. (author)
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Fossati, L. (author)
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Van Eylen, V. (author)
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Justesen, A. Bo (author)
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Livingston, J. (author)
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Kubyshkina, D. (author)
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Deeg, H. J. (author)
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Guenther, E. W. (author)
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Nowak, G. (author)
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Cabrera, J. (author)
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Eigmüller, Ph (author)
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Csizmadia, Sz. (author)
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Smith, A. M. S. (author)
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Erikson, A. (author)
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Albrecht, S. (author)
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Alonso, R. (author)
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Cochran, W. D. (author)
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Endl, M. (author)
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Esposito, M. (author)
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Fukui, A. (author)
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Heeren, P. (author)
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Hidalgo, D. (author)
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Hjorth, M. (author)
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Kuzuhara, M. (author)
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Narita, N. (author)
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Nespral, D. (author)
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Palle, E. (author)
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Pätzold, M. (author)
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Rauer, H. (author)
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Rodler, F. (author)
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Winn, J. N. (author)
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(creator_code:org_t)
- 2018-10-10
- 2018
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 618:33
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Abstract
Subject headings
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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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Stars: individual: K2-216
- Planets and satellites: Atmospheres
- Techniques: photometric
- Techniques: radial velocities
- Planetary systems
- Planets and satellites: composition
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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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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show more...
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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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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Astronomy and As ...
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Chalmers University of Technology