An ultra-short-period super-Earth with an extremely high density and an outer companion

Bibcode
2024NatSR..1427219L
DOI
10.1038/s41598-024-76490-y
Livingston, John H.; Gandolfi, Davide; Trani, Alessandro A.; Herath, Mahesh; Barragán, Oscar; Hatzes, Artie; Luque, Rafael; Fukui, Akihiko; Nowak, Grzegorz; Palle, Enric; Hellier, Coel; Fridlund, Malcolm; de Leon, Jerome; Hirano, Teruyuki; Narita, Norio; Albrecht, Simon; Dai, Fei; Deeg, Hans; Van Eylen, Vincent; Korth, Judith; Tamura, Motohide
Bibliographical reference

Scientific Reports

Advertised on:
11
2024
Number of authors
21
IAC number of authors
3
Citations
0
Refereed citations
0
Description
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.
Type
Refereed

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