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.

stars: fundamental parameters

planets and satellites: detection

techniques: photometric

exoplanets

methods: data analysis

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, Extragalactic Astrophysics

A. A. Trani

University of Tokyo

F. Dai

California Institute of Technology (Caltech)

E. Diez Alonso

Inst Univ Ciencias & Tecnol Espaciales Asturias I

A. Castro-Gonzalez

Inst Univ Ciencias & Tecnol Espaciales Asturias I

Malcolm Fridlund

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

A. Fukui

Instituto de Astrofísica de Canarias

University of Tokyo

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

Instituto de Astrofísica de Canarias

Astrobiology Center, Japan

University of Tokyo

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

University of Tokyo

National Astronomical Observatory of Japan

Astrobiology Center, Japan

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 508 1 195-218

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1093/mnras/stab2305

More information

Latest update

11/10/2021