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K2-141 b : A 5- M ⊗ super-Earth transiting a K7 v star every 6.7 h

Barragán, O. ; Gandolfi, D. ; Dai, F. ; Livingston, J. ; Persson, C. M. ; Hirano, T. ; Narita, N. ; Csizmadia, Sz ; Winn, J. N. and Nespral, D. , et al. (2018) In Astronomy and Astrophysics 612.
Abstract

We report on the discovery of K2-141 b (EPIC 246393474 b), an ultra-short-period super-Earth on a 6.7 h orbit transiting an active K7 V star based on data from K2 campaign 12. We confirmed the planet's existence and measured its mass with a series of follow-up observations: seeing-limited Muscat imaging, NESSI high-resolution speckle observations, and FIES and HARPS high-precision radial-velocity monitoring. K2-141 b has a mass of 5.31 ± 0.46 M⊗ and radius of 1.54-0.09+0.10 R⊗, yielding a mean density of 8.00-1.45+1.83 g cm-3 and suggesting a rocky-iron composition. Models indicate that iron cannot exceed ∼70% of the total mass. With an orbital period of only... (More)

We report on the discovery of K2-141 b (EPIC 246393474 b), an ultra-short-period super-Earth on a 6.7 h orbit transiting an active K7 V star based on data from K2 campaign 12. We confirmed the planet's existence and measured its mass with a series of follow-up observations: seeing-limited Muscat imaging, NESSI high-resolution speckle observations, and FIES and HARPS high-precision radial-velocity monitoring. K2-141 b has a mass of 5.31 ± 0.46 M⊗ and radius of 1.54-0.09+0.10 R⊗, yielding a mean density of 8.00-1.45+1.83 g cm-3 and suggesting a rocky-iron composition. Models indicate that iron cannot exceed ∼70% of the total mass. With an orbital period of only 6.7 h, K2-141 b is the shortest-period planet known to date with a precisely determined mass.

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publishing date
type
Contribution to journal
publication status
published
keywords
Planetary systems, Planets and satellites: individual: EPIC 246393474 b, Stars: fundamental parameters, Stars: individual: EPIC 246393474, Techniques: photometric, Techniques: radial velocities
in
Astronomy and Astrophysics
volume
612
article number
A95
publisher
EDP Sciences
external identifiers
  • scopus:85047202705
ISSN
0004-6361
DOI
10.1051/0004-6361/201732217
language
English
LU publication?
no
additional info
Publisher Copyright: © ESO 2018.
id
0412fb53-1853-49c6-8766-544bd940a6f8
date added to LUP
2023-02-02 11:27:26
date last changed
2023-02-20 14:26:43
@article{0412fb53-1853-49c6-8766-544bd940a6f8,
  abstract     = {{<p>We report on the discovery of K2-141 b (EPIC 246393474 b), an ultra-short-period super-Earth on a 6.7 h orbit transiting an active K7 V star based on data from K2 campaign 12. We confirmed the planet's existence and measured its mass with a series of follow-up observations: seeing-limited Muscat imaging, NESSI high-resolution speckle observations, and FIES and HARPS high-precision radial-velocity monitoring. K2-141 b has a mass of 5.31 ± 0.46 M<sub>⊗</sub> and radius of 1.54<sub>-0.09</sub><sup>+0.10</sup> R<sub>⊗</sub>, yielding a mean density of 8.00<sub>-1.45</sub><sup>+1.83</sup> g cm<sup>-3</sup> and suggesting a rocky-iron composition. Models indicate that iron cannot exceed ∼70% of the total mass. With an orbital period of only 6.7 h, K2-141 b is the shortest-period planet known to date with a precisely determined mass.</p>}},
  author       = {{Barragán, O. and Gandolfi, D. and Dai, F. and Livingston, J. and Persson, C. M. and Hirano, T. and Narita, N. and Csizmadia, Sz and Winn, J. N. and Nespral, D. and Prieto-Arranz, J. and Smith, A. M.S. and Nowak, G. and Albrecht, S. and Antoniciello, G. and Bo Justesen, A. and Cabrera, J. and Cochran, W. D. and Deeg, H. and Eigmuller, Ph and Endl, M. and Erikson, A. and Fridlund, M. and Fukui, A. and Grziwa, S. and Guenther, E. and Hatzes, A. P. and Hidalgo, D. and Johnson, M. C. and Korth, J. and Palle, E. and Patzold, M. and Rauer, H. and Tanaka, Y. and Van Eylen, V.}},
  issn         = {{0004-6361}},
  keywords     = {{Planetary systems; Planets and satellites: individual: EPIC 246393474 b; Stars: fundamental parameters; Stars: individual: EPIC 246393474; Techniques: photometric; Techniques: radial velocities}},
  language     = {{eng}},
  month        = {{04}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{K2-141 b : A 5- M <sub>⊗</sub> super-Earth transiting a K7 v star every 6.7 h}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/201732217}},
  doi          = {{10.1051/0004-6361/201732217}},
  volume       = {{612}},
  year         = {{2018}},
}