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Updated: Jun 8, 2025

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
Published on: May 10, 2020
An ultra-short-period super-Earth with an extremely high density and an outer companion
John H Livingston1,2,3, Davide Gandolfi4, Alessandro A Trani5,6,7
1Astrobiology Center, NINS, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan. john.livingston@nao.ac.jp.
Abstract:
We present the discovery and characterization of a new multi-planetary system around the Sun-like star K2-360 (EPIC 201595106). K2-360 was first identified in K2 photometry as the host of an ultra-short-period (USP) planet candidate with a period of 0.88 d. We obtained follow-up transit photometry, confirming the star as the host of the signal. High precision radial velocity measurements from HARPS and HARPS-N confirm the transiting USP planet and reveal the existence of an outer (non-transiting) planet with an orbital period of 10 d. We measure a mass of and a radius of for the transiting planet, yielding a high mean density of g , making it the densest well-characterized USP super-Earth discovered to date. We measure a minimum mass of for the outer planet, and explore a migration formation pathway via the von Zeipel-Kozai-Lidov (ZKL) mechanism and tidal dissipation.
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