Bibcode
Smith, A. M. S.; Cabrera, J.; Csizmadia, Sz; Dai, F.; Gandolfi, D.; Hirano, T.; Winn, J. N.; Albrecht, S.; Alonso, R.; Antoniciello, G.; Barragán, O.; Deeg, H.; Eigmüller, Ph; Endl, M.; Erikson, A.; Fridlund, M.; Fukui, A.; Grziwa, S.; Guenther, E. W.; Hatzes, A. P.; Hidalgo, D.; Howard, A. W.; Isaacson, H.; Korth, J.; Kuzuhara, M.; Livingston, J.; Narita, N.; Nespral, D.; Nowak, G.; Palle, E.; Pätzold, M.; Persson, C. M.; Petigura, E.; Prieto-Arranz, J.; Rauer, H.; Ribas, I.; Van Eylen, V.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 474, Issue 4, p.5523-5533
Advertised on:
3
2018
Citations
43
Refereed citations
39
Description
We report the discovery in K2's Campaign 10 of a transiting terrestrial
planet in an ultra-short-period orbit around an M3-dwarf. K2-137 b
completes an orbit in only 4.3 h, the second shortest orbital period of
any known planet, just 4 min longer than that of KOI 1843.03, which also
orbits an M-dwarf. Using a combination of archival images, adaptive
optics imaging, radial velocity measurements, and light-curve modelling,
we show that no plausible eclipsing binary scenario can explain the K2
light curve, and thus confirm the planetary nature of the system. The
planet, whose radius we determine to be 0.89 ± 0.09
R⊕, and which must have an iron mass fraction greater
than 0.45, orbits a star of mass 0.463 ± 0.052 M⊙
and radius 0.442 ± 0.044 R⊙.
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