Scaling K2. V. Statistical Validation of 60 New Exoplanets From K2 Campaigns 2-18
Abstract
The NASA K2 mission, salvaged from the hardware failures of the Kepler telescope, has continued Kepler's planet-hunting success. It has revealed nearly 500 transiting planets around the ecliptic plane, many of which are the subject of further study, and over 1000 additional candidates. Here we present the results of an ongoing project to follow-up and statistically validate new K2 planets, in particular to identify promising new targets for further characterization. By analyzing the reconnaissance spectra, high-resolution imaging, centroid variations, and statistical likelihood of the signals of 91 candidates, we validate 60 new planets in 46 systems. These include: a number of planets amenable to transmission spectroscopy (K2-384 f, K2-387 b, K2-390 b, K2-403 b, and K2-398 c), emission spectroscopy (K2-371 b, K2-370 b, and K2-399 b), and both (K2-405 b and K2-406 b); several systems with planets in or close to mean motion resonances (K2-381, K2-398) including a compact, TRAPPIST-1-like system of five small planets orbiting a mid-M dwarf (K2-384); an ultra-short period sub-Saturn in the hot Saturn desert (K2-399 b); and a super-Earth orbiting a moderately bright (V=11.93), metal-poor ([Fe/H]=-0.579+/-0.080) host star (K2-408 b). In total we validate planets around 4 F stars, 26 G stars, 13 K stars, and 3 M dwarfs. In addition, we provide a list of 37 vetted planet candidates that should be prioritized for future follow-up observation in order to be confirmed or validated.
Keywords
Cite
@article{arxiv.2203.02087,
title = {Scaling K2. V. Statistical Validation of 60 New Exoplanets From K2 Campaigns 2-18},
author = {Jessie L. Christiansen and Sakhee Bhure and Jon K. Zink and Kevin K. Hardegree-Ullman and Britt Duffy Adkins and Christina Hedges and Timothy D. Morton and Allyson Bieryla and David R. Ciardi and William D. Cochran and Courtney D. Dressing and Mark E. Everett and Howard Isaacson and John H. Livingston and Carl Ziegler and Perry Berlind and Michael L. Calkins and Gilbert A. Esquerdo and David W. Latham and Michael Endl and Phillip J. MacQueen and Benjamin J. Fulton and Lea A. Hirsch and Andrew W. Howard and Lauren M. Weiss and Bridgette E. Allen and Arthur Berberyann and Krys N. Ciardi and Ava Dunlavy and Sofia H. Glassford and Fei Dai and Teruyuki Hirano and Motohide Tamura and Charles Beichman and Erica J. Gonzales and Joshua E. Schlieder and Thomas Barclay and Ian J. M. Crossfield and Emily A. Gilbert and Elisabeth C. Matthews and Steven Giacalone and Erik A. Petigura},
journal= {arXiv preprint arXiv:2203.02087},
year = {2022}
}
Comments
50 pages, 14 figures, 7 tables, accepted in AJ; replaced to fix error in planet name (thanks Travis!) and error in figure label