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

Livingston, John H. ; Gandolfi, Davide ; Trani, Alessandro A. ; Herath, Mahesh ; Barragán, Oscar ; Hatzes, Artie ; Luque, Rafael ; Fukui, Akihiko ; Nowak, Grzegorz and Palle, Enric , et al. (2024) In Scientific Reports 14(1).
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 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... (More)

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.

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publishing date
type
Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
14
issue
1
article number
27219
publisher
Nature Publishing Group
external identifiers
  • pmid:39516227
  • scopus:85209349872
ISSN
2045-2322
DOI
10.1038/s41598-024-76490-y
language
English
LU publication?
yes
additional info
Publisher Copyright: © The Author(s) 2024.
id
fc31a855-4cb7-40ac-9e89-699413260600
date added to LUP
2025-01-10 08:30:22
date last changed
2025-07-26 00:45:43
@article{fc31a855-4cb7-40ac-9e89-699413260600,
  abstract     = {{<p>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<sub>⊕</sub> and a radius of 1.57±0.08 R<sub>⊕</sub> for the transiting planet, yielding a high mean density of 11±2 g cm<sup>-3</sup>, making it the densest well-characterized USP super-Earth discovered to date. We measure a minimum mass of 15.2±1.8 M<sub>⊕</sub> for the outer planet, and explore a migration formation pathway via the von Zeipel–Kozai–Lidov (ZKL) mechanism and tidal dissipation.</p>}},
  author       = {{Livingston, John H. and Gandolfi, Davide and Trani, Alessandro A. and Herath, Mahesh and Barragán, Oscar and Hatzes, Artie and Luque, Rafael and Fukui, Akihiko and Nowak, Grzegorz and Palle, Enric and Hellier, Coel and Fridlund, Malcolm and de Leon, Jerome and Hirano, Teruyuki and Narita, Norio and Albrecht, Simon and Dai, Fei and Deeg, Hans and Van Eylen, Vincent and Korth, Judith and Tamura, Motohide}},
  issn         = {{2045-2322}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Scientific Reports}},
  title        = {{An ultra-short-period super-Earth with an extremely high density and an outer companion}},
  url          = {{http://dx.doi.org/10.1038/s41598-024-76490-y}},
  doi          = {{10.1038/s41598-024-76490-y}},
  volume       = {{14}},
  year         = {{2024}},
}