Journal
ASTRONOMY & ASTROPHYSICS
Volume 612, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201732217
Keywords
planetary systems; planets and satellites: individual: EPIC 246393474 b; stars: fundamental parameters; stars: individual: EPIC 246393474; techniques: photometric; techniques: radial velocities
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Funding
- Programma Giovani Ricercatori - Rita Levi Montalcini - Rientro dei Cervelli - Italian Ministry of Education, Universities and Research (MIUR)
- Spanish Ministry of Economics and Competitiveness [ESP2014-57495-C2-1-R, ESP2016-80435-C2-2-R]
- Swedish National Space Board
- Hungarian OTKA Grant [K113117]
- NASA Science Mission directorate
- Spanish MICINN [AyA2011-24052]
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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 K7V 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-circle plus and radius of 1.54(-0.09)(+0.10), 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 similar to 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.
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