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K2-137 b : An Earth-sized planet in a 4.3-h orbit around an M-dwarf

Smith, A. M.S. ; Cabrera, J. ; Csizmadia, Sz ; Dai, F. ; Gandolfi, D. ; Hirano, T. ; Winn, J. N. ; Albrecht, S. ; Alonso, R. and Antoniciello, G. , et al. (2018) In Monthly Notices of the Royal Astronomical Society 474(4). p.5523-5533
Abstract

We report the discovery in K2's Campaign 10 of a transiting terrestrial planet in an ultrashort- 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⊕, and which must have an iron mass fraction greater than 0.45, orbits a star of mass 0.463 ± 0.052 M⊙... (More)

We report the discovery in K2's Campaign 10 of a transiting terrestrial planet in an ultrashort- 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⊕, and which must have an iron mass fraction greater than 0.45, orbits a star of mass 0.463 ± 0.052 M⊙ and radius 0.442 ± 0.044 R⊙.

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publishing date
type
Contribution to journal
publication status
published
keywords
Planets and satellites: detection, Planets and satellites: individual: K2-137 b
in
Monthly Notices of the Royal Astronomical Society
volume
474
issue
4
pages
11 pages
publisher
Oxford University Press
external identifiers
  • scopus:85042641224
ISSN
0035-8711
DOI
10.1093/mnras/stx2891
language
English
LU publication?
no
additional info
Publisher Copyright: © 2018 The Author(s).
id
bbb7f1f5-c22c-42e0-8dc3-c3b330350988
date added to LUP
2023-02-02 12:27:21
date last changed
2023-02-21 10:15:55
@article{bbb7f1f5-c22c-42e0-8dc3-c3b330350988,
  abstract     = {{<p>We report the discovery in K2's Campaign 10 of a transiting terrestrial planet in an ultrashort- 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<sub>⊕</sub>, and which must have an iron mass fraction greater than 0.45, orbits a star of mass 0.463 ± 0.052 M<sub>⊙</sub> and radius 0.442 ± 0.044 R<sub>⊙</sub>.</p>}},
  author       = {{Smith, A. M.S. and Cabrera, J. and Csizmadia, Sz and Dai, F. and Gandolfi, D. and Hirano, T. and Winn, J. N. and Albrecht, S. and Alonso, R. and Antoniciello, G. and Barragán, O. and Deeg, H. and Eigmüller, Ph and Endl, M. and Erikson, A. and Fridlund, M. and Fukui, A. and Grziwa, S. and Guenther, E. W. and Hatzes, A. P. and Hidalgo, D. and Howard, A. W. and Isaacson, H. and Korth, J. and Kuzuhara, M. and Livingston, J. and Narita, N. and Nespral, D. and Nowak, G. and Palle, E. and Pätzold, M. and Persson, C. M. and Petigura, E. and Prieto-Arranz, J. and Rauer, H. and Ribas, I. and Van Eylen, V.}},
  issn         = {{0035-8711}},
  keywords     = {{Planets and satellites: detection; Planets and satellites: individual: K2-137 b}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{4}},
  pages        = {{5523--5533}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{K2-137 b : An Earth-sized planet in a 4.3-h orbit around an M-dwarf}},
  url          = {{http://dx.doi.org/10.1093/mnras/stx2891}},
  doi          = {{10.1093/mnras/stx2891}},
  volume       = {{474}},
  year         = {{2018}},
}