2017/11/30 by O. Barragán, Oscar Barragán, D. Gandolfi +50 · 69 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #High-pressure geophysics and materials #Physics #Stellar, planetary, and galactic studies #astro-ph.EP #astro-ph.SR
paper · pdf · doi:10.1051/0004-6361/201732217
published in Astronomy and Astrophysics 612, A95 (EDP Sciences) · 11 pages, 4 Tables, 10 Figures, accepted for publication by A&A
arxiv created 2018/01/11 · openalex publication_date 2018/01/22 · openalex created_date 2018/02/02 · arxiv updated 2018/05/09 · openalex updated_date 2026/08/05
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.