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

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

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  • Author: Korth, J

    Universität zu Köln, Germany

  • Author: Csizmadia, Sz

    German Aerospace Center, Germany

  • Author: Gandolfi, Davide

    University of Turin, Italy

  • Author: Fridlund, M

    Chalmers University of Technology, Sweden

  • Author: Pätzold, M

    Universität zu Köln, Germany

  • Author: Hirano, T.

    Tokyo Institute of Technology, Japan

  • Author: Livingston, John

    University of Tokyo, Japan

  • Author: Persson, C M

    Chalmers University of Technology, Sweden

  • Author: Deeg, H J

    University of La Laguna, Spain

  • Author: Justesen, A B

    Aarhus University, Denmark

  • Author: Barragán, O

    University of Turin, Italy

  • Author: Grziwa, S

    Universität zu Köln, Germany

  • Author: Endl, M

    University of Texas at Austin, United States

  • Author: Tronsgaard, R.

    Astrophysics and Atmospheric Physics, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Dai, You-Fen

    Princeton University, United States

  • Author: Cochran, W. D.

    University of Texas at Austin, United States

  • Author: Albrecht, S. M.

    Aarhus University, Denmark

  • Author: Alonso, R.

    University of La Laguna, Spain

  • Author: Cabrera Gomez, Jose G.

    German Aerospace Center, Germany

  • Author: Cauley, P W

    Wesleyan University, United States

  • Author: Cusano, F

    National Institute for Astrophysics, Italy

  • Author: Eigmüller, Ph

    German Aerospace Center, Germany

  • Author: Erikson, T.A.

    German Aerospace Center, Germany

  • Author: Esposito, M.

    Thüringer Landessternwarte Tautenburg, Germany

  • Author: Guenther, E W

    Thüringer Landessternwarte Tautenburg, Germany

  • Author: Hatzes, A. P.

    Thüringer Landessternwarte Tautenburg, Germany

  • Author: Hidalgo, D

    University of La Laguna, Spain

  • Author: Kuzuhara, M

    National Astronomical Observatory of Japan, Japan

  • Author: Montanés Rodriguez, Pilar

    University of La Laguna, Spain

  • Author: Napolitano, N R

    National Institute for Astrophysics, Italy

  • Author: Narita, Norio

    University of Tokyo, Japan

  • Author: Niraula, P

    Wesleyan University, United States

  • Author: Nespral, D

    University of La Laguna, Spain

  • Author: Gudowska-Nowak, E.

    University of La Laguna, Spain

  • Author: Pallé, Enric

    University of La Laguna, Spain

  • Author: Petrillo, C E

    University of Groningen, Netherlands

  • Author: Redfield, S

    Wesleyan University, United States

  • Author: Prieto-Arranz, J

    University of La Laguna, Spain

  • Author: Rauer, H

    German Aerospace Center, Germany

  • Author: Smith, A M S

    German Aerospace Center, Germany

  • Author: Tortora, C

    University of Groningen, Netherlands

  • Author: Van Eylen, V

    Leiden University, Netherlands

  • Author: Winn, J N

    Princeton University, United States

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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 = 12.6 mag, 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 = 12.6 mag 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 ± 1.9 M and a radius of Rp = 2.2 ± 0.1 R⁠, 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.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume482
Issue number2
Pages (from-to)1807-1823
ISSN0035-8711
DOIs
Publication statusPublished - 2019

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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    Research areas

  • Techniques: photometric, Techniques: radial velocities, Stars: individual: K2-140, Stars: individual: K2-180, Planets and satellites: fundamental parameters, Stars: fundamental parameters

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