The K2-OjOS Project*New and revisited planets and candidates in K2 campaigns 5, 16, & 18
Journal article, 2022
We present the first results of K2-OjOS, a collaborative project between professional and amateur astronomers primarily aimed to detect, characterize, and validate new extrasolar planets. For this work, 10 amateur astronomers looked for planetary signals by visually inspecting the 20 427 light curves of K2 campaign 18 (C18). They found 42 planet candidates, of which 18 are new detections and 24 had been detected in the overlapping C5 by previous works. We used archival photometric and spectroscopic observations, as well as new high-spatial resolution images in order to carry out a complete analysis of the candidates found, including a homogeneous characterization of the host stars, transit modelling, search for transit timing variations and statistical validation. As a result, we report four new planets (K2-355 b, K2-356 b, K2-357 b, and K2-358 b) and 14 planet candidates. Besides, we refine the transit ephemeris of the previously published planets and candidates by modelling C5, C16 (when available) and C18 photometric data jointly, largely improving the period and mid-transit time precision. Regarding individual systems, we highlight the new planet K2-356 b and candidate EPIC 211537087.02 being near a 2:1 period commensurability, the detection of significant TTVs in the bright star K2-184 (V = 10.35), the location of K2-103 b inside the habitable zone according to optimistic models, the detection of a new single transit in the known system K2-274, and the disposition reassignment of K2-120 b, which we consider as a planet candidate as the origin of the signal cannot be ascertained.
photometric
detection
fundamental parameters
fundamental parameters
techniques
planets and satellites
image processing
stars
techniques
planets and satellites
Author
A. Castro-González
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
E. Díez Alonso
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
J. Menéndez Blanco
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
J. Livingston
University of Tokyo
Jerome P. De Leon
University of Tokyo
J. Lillo-Box
Centro de Astrobiologia (CAB)
Judith Korth
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
S. Fernández Menéndez
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
J. M. Recio
University of Oviedo
Fernando Izquierdo Ruiz
Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry
A. Coya Lozano
Sociedad Astronómica Asturiana Omega
F. García De La Cuesta
Sociedad Astronómica Asturiana Omega
N. Gómez Hernández
Sociedad Astronómica Asturiana Omega
J. R. Vidal Blanco
Sociedad Astronómica Asturiana Omega
R. Hevia Díaz
Sociedad Astronómica Asturiana Omega
R. Pardo Silva
Sociedad Astronómica Asturiana Omega
S. Pérez Acevedo
Sociedad Astronómica Asturiana Omega
J. Polancos Ruiz
Sociedad Astronómica Asturiana Omega
P. Padilla Tijerín
Sociedad Astronómica Asturiana Omega
D. Vázquez García
Sociedad Astronómica Asturiana Omega
S. L. Suárez Gómez
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
F. García Riesgo
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
C. González Gutiérrez
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
L. Bonavera
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
J. González-Nuevo
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
C. Rodríguez Pereira
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
F. Sánchez Lasheras
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
M. L. Sánchez Rodríguez
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
R. Muñiz
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
J. D. Santos Rodríguez
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
F. J. De Cos Juez
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 509 1 1075-1095Subject Categories
Astronomy, Astrophysics and Cosmology
Atom and Molecular Physics and Optics
Signal Processing
DOI
10.1093/mnras/stab2669