Smith, A. M. S., Cabrera, J., Csizmadia, Sz., Dai, F., Gandolfi, D., Hirano, T., Winn, J. N., Albrecht, S., Alonso, R., Antoniciello, G., Barragan, O., Deeg, H., Eigmueller, Ph., Endl, M., Erikson, A., Fridlund, M., Fukui, A., Grziwa, S., Guenther, E. W., Hatzes, A. P., Hidalgo, D., Howard, A. W., Isaacson, H., Korth, J., Kuzuhara, M., Livingston, J., Narita, N., Nespral, D., Nowak, G., Palle, E., Paetzold, M., Persson, C. M., Petigura, E., Prieto-Arranz, J., Rauer, H., Ribas, I. and Van Eylen, V. (2018). K2-137 b: an Earth-sized planet in a 4.3-h orbit around an M-dwarf. Mon. Not. Roy. Astron. Soc., 474 (4). S. 5523 - 5534. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We report the discovery in K2's Campaign 10 of a transiting terrestrial planet in an ultra-short-period orbit around an M3-dwarf. K2-137 b completes an orbit in only 4.3 h, the second shortest orbital period of any known planet, just 4 min longer than that of KOI 1843.03, which also orbits an M-dwarf. Using a combination of archival images, adaptive optics imaging, radial velocity measurements, and light-curve modelling, we show that no plausible eclipsing binary scenario can explain the K2 light curve, and thus confirm the planetary nature of the system. The planet, whose radius we determine to be 0.89 +/- 0.09 R-circle plus, and which must have an iron mass fraction greater than 0.45, orbits a star of mass 0.463 +/- 0.052 M-circle dot and radius 0.442 +/- 0.044 R-circle dot.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Smith, A. M. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cabrera, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csizmadia, Sz.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dai, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gandolfi, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hirano, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Winn, J. N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Albrecht, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alonso, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Antoniciello, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barragan, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deeg, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eigmueller, Ph.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Endl, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erikson, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fridlund, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fukui, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grziwa, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guenther, E. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatzes, A. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hidalgo, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Howard, A. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Isaacson, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Korth, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuzuhara, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Livingston, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Narita, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nespral, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nowak, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Palle, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paetzold, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Persson, C. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Petigura, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Prieto-Arranz, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rauer, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ribas, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van Eylen, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-195241
DOI: 10.1093/mnras/stx2891
Journal or Publication Title: Mon. Not. Roy. Astron. Soc.
Volume: 474
Number: 4
Page Range: S. 5523 - 5534
Date: 2018
Publisher: OXFORD UNIV PRESS
Place of Publication: OXFORD
ISSN: 1365-2966
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
TIDAL EVOLUTION; SPECTROGRAPH; SPECTRAMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/19524

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