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. Cauley; F. 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

doi:10.1093/mnras/sty2760

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

Astrophysical Sciences

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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=12.6mag, 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_p = 11.3 ± 1.9M⊕ and a radius of R_p = 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.

Original language	English (US)
Pages (from-to)	1807-1823
Number of pages	17
Journal	Monthly Notices of the Royal Astronomical Society
Volume	482
Issue number	2
DOIs	https://doi.org/10.1093/mnras/sty2760
State	Published - Jan 11 2019

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

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

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10.1093/mnras/sty2760

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Korth, J., Csizmadia, S., 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., ... 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

@article{598bac070c1b45dc9b6f16b844d94ee5,

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=12.6mag, 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.",

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

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 {Van Eylen}, V. and Winn, {J. N.}",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.",

year = "2019",

month = jan,

day = "11",

doi = "10.1093/mnras/sty2760",

language = "English (US)",

volume = "482",

pages = "1807--1823",

journal = "Monthly Notices of the Royal Astronomical Society",

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

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.

PY - 2019/1/11

Y1 - 2019/1/11

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=12.6mag, 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.

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=12.6mag, 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.

KW - Planets and satellites: fundamental parameters

KW - Stars: fundamental parameters

KW - Stars: individual: K2-140

KW - Stars: individual: K2-180

KW - Techniques: photometric

KW - Techniques: radial velocities

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U2 - 10.1093/mnras/sty2760

DO - 10.1093/mnras/sty2760

M3 - Article

AN - SCOPUS:85057187414

SN - 0035-8711

VL - 482

SP - 1807

EP - 1823

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

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

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