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An ultra-short-period super-Earth with an extremely high density and an outer companion
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Journal Article
An ultra-short-period super-Earth with an extremely high density and an outer companion
2024
Overview
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
7.67
±
0.75
M
⊕
and a radius of
1.57
±
0.08
R
⊕
for the transiting planet, yielding a high mean density of
11
±
2
g
cm
-
3
, making it the densest well-characterized USP super-Earth discovered to date. We measure a minimum mass of
15.2
±
1.8
M
⊕
for the outer planet, and explore a migration formation pathway via the von Zeipel–Kozai–Lidov (ZKL) mechanism and tidal dissipation.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
