Bibcode
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.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 2, p.1807-1823
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1
2019
Citations
19
Refereed citations
18
Description
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_{\oplus} and a
radius of Rp = 2.2 ± 0.1 R_{\oplus}, 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.
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