K2-141 b
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Published:2018-04
Issue:
Volume:612
Page:A95
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ISSN:0004-6361
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Container-title:Astronomy & Astrophysics
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language:
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Short-container-title:A&A
Author:
Barragán O.ORCID, Gandolfi D., Dai F., Livingston J., Persson C. M., Hirano T., Narita N., Csizmadia Sz., Winn J. N., Nespral D., Prieto-Arranz J., Smith A. M. S., Nowak G., Albrecht S., Antoniciello G., Bo Justesen A., Cabrera J., Cochran W. D., Deeg H., Eigmuller Ph., Endl M., Erikson A., Fridlund M., Fukui A., Grziwa S., Guenther E., Hatzes A. P., Hidalgo D., Johnson M. C., Korth J., Palle E., Patzold M., Rauer H., Tanaka Y., Van Eylen V.
Abstract
We report on the discovery of K2-141 b (EPIC 246393474 b), an ultra-short-period super-Earth on a 6.7 h orbit transiting an active K7 V star based on data from K2 campaign 12. We confirmed the planet’s existence and measured its mass with a series of follow-up observations: seeing-limited MuSCAT imaging, NESSI high-resolution speckle observations, and FIES and HARPS high-precision radial-velocity monitoring. K2-141 b has a mass of 5.31 ± 0.46 M⊕ and radius of 1.54−0.09+0.10 R⊕, yielding a mean density of 8.00−1.45+1.83 g cm−3 and suggesting a rocky-iron composition. Models indicate that iron cannot exceed ~70% of the total mass. With an orbital period of only 6.7 h, K2-141 b is the shortest-period planet known to date with a precisely determined mass.
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
51 articles.
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