37 new validated planets in overlapping K2 campaigns
Journal article, 2021
We analysed 68 candidate planetary systems first identified during Campaigns 5 and 6 (C5 and C6) of the NASA K2 mission. We set out to validate these systems by using a suite of follow-up observations, including adaptive optics, speckle imaging, and reconnaissance spectroscopy. The overlap between C5 with C16 and C18, and C6 with C17, yields light curves with long baselines that allow us to measure the transit ephemeris very precisely, revisit single transit candidates identified in earlier campaigns, and search for additional transiting planets with longer periods not detectable in previous works. Using vespa, we compute false positive probabilities of less than 1 percent for 37 candidates orbiting 29 unique host stars and hence statistically validate them as planets. These planets have a typical size of 2.2 R-circle plus and orbital periods between 1.99 and 52.71 d. We highlight interesting systems including a sub-Neptune with the longest period detected by K2, sub-Saturns around F stars, several multiplanetary systems in a variety of architectures. These results show that a wealth of planetary systems still remains in the K2 data, some of which can be validated using minimal follow-up observations and taking advantage of analyses presented in previous catalogues.
exoplanets
methods: data analysis
stars: fundamental parameters
planets and satellites: detection
techniques: photometric
Author
J. P. de Leon
University of Tokyo
J. Livingston
University of Tokyo
M. Endl
The University of Texas at Austin
W. D. Cochran
The University of Texas at Austin
T. Hirano
Tokyo Institute of Technology
R. A. Garcia
Paris Diderot University
S. Mathur
Instituto de Astrofísica de Canarias
University of La Laguna
K. W. F. Lam
Technische Universität Berlin
Judith Korth
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
A. A. Trani
University of Tokyo
F. Dai
California Institute of Technology (Caltech)
E. Diez Alonso
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
A. Castro-Gonzalez
Instituto Universitario de Ciencias y Tecnologías Espaciales de Asturias (ICTEA)
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
A. Fukui
University of Tokyo
Instituto de Astrofísica de Canarias
D. Gandolfi
University of Turin
P. Kabath
Czech Academy of Sciences
M. Kuzuhara
California Institute of Technology (Caltech)
R. Luque
Instituto de Astrofísica de Canarias
University of La Laguna
A. B. Savel
University of Maryland
H. Gill
University of California at Berkeley
C. Dressing
University of California at Berkeley
S. Giacalone
University of California at Berkeley
N. Narita
University of Tokyo
Astrobiology Center, Japan
Instituto de Astrofísica de Canarias
Japan Science and Technology Agency
E. Palle
Instituto de Astrofísica de Canarias
University of La Laguna
V. Van Eylen
University College London (UCL)
M. Tamura
Astrobiology Center, Japan
National Astronomical Observatory of Japan
University of Tokyo
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 508 1 195-218Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.1093/mnras/stab2305