Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

K2-140b and K2-180b - Characterization of a hot Jupiter and a mini-Neptune from the K2 mission

Korth, J. LU ; Csizmadia, Sz ; Gandolfi, D. ; Fridlund, M. ; Pätzold, M. ; Hirano, T. ; Livingston, J. ; Persson, C. M. ; Deeg, H. J. and Justesen, A. B. , et al. (2019) In Monthly Notices of the Royal Astronomical Society 482(2). p.1807-1823
Abstract

We report the independent discovery and characterization of two K2 planets: K2-180b, a mini-Neptune-sized planet in an 8.9-d orbit transiting a V=12.6mag, metal-poor ([Fe/H] = -0.65 ± 0.10) K2V star in K2 campaign 5; K2-140b, a transiting hot Jupiter in a 6.6-d orbit around a V=12.6mag G6V ([Fe/H] = +0.10 ± 0.10) star in K2 campaign 10. Our results are based on K2 time-series photometry combined with high-spatial resolution imaging and high-precision radial velocity measurements. We present the first mass measurement of K2-180b. K2-180b has a mass of Mp = 11.3 ± 1.9M⊕ and a radius of Rp = 2.2 ± 0.1R⊕, yielding a mean density of ρp = 5.6 ± 1.9 g cm-3, suggesting a rocky composition. Given its radius,... (More)

We report the independent discovery and characterization of two K2 planets: K2-180b, a mini-Neptune-sized planet in an 8.9-d orbit transiting a V=12.6mag, metal-poor ([Fe/H] = -0.65 ± 0.10) K2V star in K2 campaign 5; K2-140b, a transiting hot Jupiter in a 6.6-d orbit around a V=12.6mag G6V ([Fe/H] = +0.10 ± 0.10) star in K2 campaign 10. Our results are based on K2 time-series photometry combined with high-spatial resolution imaging and high-precision radial velocity measurements. We present the first mass measurement of K2-180b. K2-180b has a mass of Mp = 11.3 ± 1.9M⊕ and a radius of Rp = 2.2 ± 0.1R⊕, yielding a mean density of ρp = 5.6 ± 1.9 g cm-3, suggesting a rocky composition. Given its radius, K2-180b is above the region of the so-called 'planetary radius gap'. K2-180b is in addition not only one of the densest mini-Neptune-sized planets, but also one of the few mini-Neptune-sized planets known to transit a metal-poor star. We also constrain the planetary and orbital parameters of K2-140b and show that, given the currently available Doppler measurements, the eccentricity is consistent with zero, contrary to the results of a previous study.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and , et al. (More)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; and (Less)
publishing date
type
Contribution to journal
publication status
published
keywords
Planets and satellites: fundamental parameters, Stars: fundamental parameters, Stars: individual: K2-140, Stars: individual: K2-180, Techniques: photometric, Techniques: radial velocities
in
Monthly Notices of the Royal Astronomical Society
volume
482
issue
2
pages
17 pages
publisher
Oxford University Press
external identifiers
  • scopus:85057187414
ISSN
0035-8711
DOI
10.1093/mnras/sty2760
language
English
LU publication?
no
additional info
Publisher Copyright: © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
id
d71ef967-f175-49fb-8b39-ae95df19bde3
date added to LUP
2023-02-02 10:45:05
date last changed
2023-02-20 13:39:32
@article{d71ef967-f175-49fb-8b39-ae95df19bde3,
  abstract     = {{<p>We report the independent discovery and characterization of two K2 planets: K2-180b, a mini-Neptune-sized planet in an 8.9-d orbit transiting a V=12.6mag, metal-poor ([Fe/H] = -0.65 ± 0.10) K2V star in K2 campaign 5; K2-140b, a transiting hot Jupiter in a 6.6-d orbit around a V=12.6mag G6V ([Fe/H] = +0.10 ± 0.10) star in K2 campaign 10. Our results are based on K2 time-series photometry combined with high-spatial resolution imaging and high-precision radial velocity measurements. We present the first mass measurement of K2-180b. K2-180b has a mass of M<sub>p</sub> = 11.3 ± 1.9M⊕ and a radius of R<sub>p</sub> = 2.2 ± 0.1R⊕, yielding a mean density of ρp = 5.6 ± 1.9 g cm<sup>-3</sup>, suggesting a rocky composition. Given its radius, K2-180b is above the region of the so-called 'planetary radius gap'. K2-180b is in addition not only one of the densest mini-Neptune-sized planets, but also one of the few mini-Neptune-sized planets known to transit a metal-poor star. We also constrain the planetary and orbital parameters of K2-140b and show that, given the currently available Doppler measurements, the eccentricity is consistent with zero, contrary to the results of a previous study.</p>}},
  author       = {{Korth, J. and Csizmadia, Sz and Gandolfi, D. and Fridlund, M. and Pätzold, M. and Hirano, T. and Livingston, J. and Persson, C. M. and Deeg, H. J. and Justesen, A. B. and Barragán, O. and Grziwa, S. and Endl, M. and Tronsgaard, R. and Dai, F. and Cochran, W. D. and Albrecht, S. and Alonso, R. and Cabrera, J. and Cauley, P. W. and Cusano, F. and Eigmüller, Ph and Erikson, A. and Esposito, M. and Guenther, E. W. and Hatzes, A. P. and Hidalgo, D. and Kuzuhara, M. and Montañes, P. and Napolitano, N. R. and Narita, N. and Niraula, P. and Nespral, D. and Nowak, G. and Palle, E. and Petrillo, C. E. and Redfield, S. and Prieto-Arranz, J. and Rauer, H. and Smith, A. M.S. and Tortora, C. and Van Eylen, V. and Winn, J. N.}},
  issn         = {{0035-8711}},
  keywords     = {{Planets and satellites: fundamental parameters; Stars: fundamental parameters; Stars: individual: K2-140; Stars: individual: K2-180; Techniques: photometric; Techniques: radial velocities}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{2}},
  pages        = {{1807--1823}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{K2-140b and K2-180b - Characterization of a hot Jupiter and a mini-Neptune from the K2 mission}},
  url          = {{http://dx.doi.org/10.1093/mnras/sty2760}},
  doi          = {{10.1093/mnras/sty2760}},
  volume       = {{482}},
  year         = {{2019}},
}