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

J. Korth*, Sz Csizmadia, D. Gandolfi, M. Fridlund, M. Pätzold, T. Hirano, J. Livingston, C. M. Persson, H. J. Deeg, A. B. Justesen, O. Barragán, S. Grziwa, M. Endl, R. Tronsgaard, F. Dai, W. D. Cochran, S. Albrecht, R. Alonso, J. Cabrera, P. W. CauleyF. Cusano, Ph. Eigmüller, A. Erikson, M. Esposito, E. W. Guenther, A. P. Hatzes, D. Hidalgo, M. Kuzuhara, P. Montañes, N. R. Napolitano, N. Narita, P. Niraula, D Nespral, G. Nowak, E. Palle, C. E. Petrillo, S Redfield, J. Prieto-Arranz, H. Rauer, A. M. S. Smith, C. Tortora, V. Van Eylen, J. N. Winn

*Corresponding author for this work

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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 = 12.6 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.

Keywords

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

Cite this

Korth, J., Csizmadia, S., Gandolfi, D., Fridlund, M., Pätzold, M., Hirano, T., ... Winn, J. N. (2019). K2-140b and K2-180b – Characterization of a hot Jupiter and a mini-Neptune from the K2 mission. Monthly Notices of the Royal Astronomical Society, 482(2), 1807-1823. https://doi.org/10.1093/mnras/sty2760
Korth, J. ; Csizmadia, Sz ; Gandolfi, D. ; Fridlund, M. ; Pätzold, M. ; Hirano, T. ; Livingston, J. ; Persson, C. M. ; Deeg, H. J. ; Justesen, A. B. ; Barragán, O. ; Grziwa, S. ; Endl, M. ; Tronsgaard, R. ; Dai, F. ; Cochran, W. D. ; Albrecht, S. ; Alonso, R. ; Cabrera, J. ; Cauley, P. W. ; Cusano, F. ; Eigmüller, Ph. ; Erikson, A. ; Esposito, M. ; Guenther, E. W. ; Hatzes, A. P. ; Hidalgo, D. ; Kuzuhara, M. ; Montañes, P. ; Napolitano, N. R. ; Narita, N. ; Niraula, P. ; Nespral, D ; Nowak, G. ; Palle, E. ; Petrillo, C. E. ; Redfield, S ; Prieto-Arranz, J. ; Rauer, H. ; Smith, A. M. S. ; Tortora, C. ; Van Eylen, V. ; Winn, J. N. / K2-140b and K2-180b – Characterization of a hot Jupiter and a mini-Neptune from the K2 mission. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 482, No. 2. pp. 1807-1823.
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title = "K2-140b and K2-180b – Characterization of a hot Jupiter and a mini-Neptune from the K2 mission",
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 = 12.6 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.",
keywords = "Techniques: photometric, Techniques: radial velocities, Stars: individual: K2-140, Stars: individual: K2-180, Planets and satellites: fundamental parameters, Stars: fundamental parameters",
author = "J. Korth and Sz Csizmadia and D. Gandolfi and M. Fridlund and M. P{\"a}tzold and T. Hirano and J. Livingston and Persson, {C. M.} and Deeg, {H. J.} and Justesen, {A. B.} and O. Barrag{\'a}n and S. Grziwa and M. Endl and R. Tronsgaard and F. Dai and Cochran, {W. D.} and S. Albrecht and R. Alonso and J. Cabrera and Cauley, {P. W.} and F. Cusano and Ph. Eigm{\"u}ller and A. Erikson and M. Esposito and Guenther, {E. W.} and Hatzes, {A. P.} and D. Hidalgo and M. Kuzuhara and P. Monta{\~n}es and Napolitano, {N. R.} and N. Narita and P. Niraula and D Nespral and G. Nowak and E. Palle and Petrillo, {C. E.} and S Redfield and J. Prieto-Arranz and H. Rauer and Smith, {A. M. S.} and C. Tortora and V. Van Eylen and Winn, {J. N.}",
note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society {\circledC}: 2019 The author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.",
year = "2019",
doi = "10.1093/mnras/sty2760",
language = "English",
volume = "482",
pages = "1807--1823",
journal = "Royal Astronomical Society. Monthly Notices",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",

}

Korth, J, Csizmadia, S, Gandolfi, D, Fridlund, M, Pätzold, M, Hirano, T, Livingston, J, Persson, CM, Deeg, HJ, Justesen, AB, Barragán, O, Grziwa, S, Endl, M, Tronsgaard, R, Dai, F, Cochran, WD, Albrecht, S, Alonso, R, Cabrera, J, Cauley, PW, Cusano, F, Eigmüller, P, Erikson, A, Esposito, M, Guenther, EW, Hatzes, AP, Hidalgo, D, Kuzuhara, M, Montañes, P, Napolitano, NR, Narita, N, Niraula, P, Nespral, D, Nowak, G, Palle, E, Petrillo, CE, Redfield, S, Prieto-Arranz, J, Rauer, H, Smith, AMS, Tortora, C, Van Eylen, V & Winn, JN 2019, 'K2-140b and K2-180b – Characterization of a hot Jupiter and a mini-Neptune from the K2 mission', Monthly Notices of the Royal Astronomical Society, vol. 482, no. 2, pp. 1807-1823. https://doi.org/10.1093/mnras/sty2760

K2-140b and K2-180b – Characterization of a hot Jupiter and a mini-Neptune from the K2 mission. / Korth, J.; Csizmadia, Sz; Gandolfi, D.; Fridlund, M.; Pätzold, M.; Hirano, T.; Livingston, J.; Persson, C. M.; Deeg, H. J.; Justesen, A. B.; Barragán, O.; Grziwa, S.; Endl, M.; Tronsgaard, R.; Dai, F.; Cochran, W. D.; Albrecht, S.; Alonso, R.; Cabrera, J.; Cauley, P. W.; Cusano, F.; Eigmüller, Ph.; Erikson, A.; Esposito, M.; Guenther, E. W.; Hatzes, A. P.; Hidalgo, D.; Kuzuhara, M.; Montañes, P.; Napolitano, N. R.; Narita, N.; Niraula, P.; Nespral, D; Nowak, G.; Palle, E.; Petrillo, C. E.; Redfield, S; Prieto-Arranz, J.; Rauer, H.; Smith, A. M. S.; Tortora, C.; Van Eylen, V.; Winn, J. N.

In: Monthly Notices of the Royal Astronomical Society, Vol. 482, No. 2, 2019, p. 1807-1823.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - K2-140b and K2-180b – Characterization of a hot Jupiter and a mini-Neptune from the K2 mission

AU - Korth, J.

AU - Csizmadia, Sz

AU - Gandolfi, D.

AU - Fridlund, M.

AU - Pätzold, M.

AU - Hirano, T.

AU - Livingston, J.

AU - Persson, C. M.

AU - Deeg, H. J.

AU - Justesen, A. B.

AU - Barragán, O.

AU - Grziwa, S.

AU - Endl, M.

AU - Tronsgaard, R.

AU - Dai, F.

AU - Cochran, W. D.

AU - Albrecht, S.

AU - Alonso, R.

AU - Cabrera, J.

AU - Cauley, P. W.

AU - Cusano, F.

AU - Eigmüller, Ph.

AU - Erikson, A.

AU - Esposito, M.

AU - Guenther, E. W.

AU - Hatzes, A. P.

AU - Hidalgo, D.

AU - Kuzuhara, M.

AU - Montañes, P.

AU - Napolitano, N. R.

AU - Narita, N.

AU - Niraula, P.

AU - Nespral, D

AU - Nowak, G.

AU - Palle, E.

AU - Petrillo, C. E.

AU - Redfield, S

AU - Prieto-Arranz, J.

AU - Rauer, H.

AU - Smith, A. M. S.

AU - Tortora, C.

AU - Van Eylen, V.

AU - Winn, J. N.

N1 - 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.

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - Techniques: photometric

KW - Techniques: radial velocities

KW - Stars: individual: K2-140

KW - Stars: individual: K2-180

KW - Planets and satellites: fundamental parameters

KW - Stars: fundamental parameters

U2 - 10.1093/mnras/sty2760

DO - 10.1093/mnras/sty2760

M3 - Journal article

VL - 482

SP - 1807

EP - 1823

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 0035-8711

IS - 2

ER -