Catalog of New K2 Exoplanet Candidates from Citizen Scientists

Abstract

We provide 28 new planet candidates that have been vetted by citizen scientists and expert astronomers. This catalog contains 9 likely rocky candidates ($R_{pl}<2.0R_{\oplus }$) and 19 gaseous candidates ($R_{pl}>2.0R_{\oplus }$). Within this list we find one multi-planet system (EPIC 246042088). These two sub-Neptune ($2.99\pm 0.02R_{\oplus }$ and $3.44\pm 0.02R_{\oplus }$) planets exist in a near 3:2 orbital resonance. The discovery of this multi-planet system is important in its addition to the list of known multi-planet systems within the K2 catalog, and more broadly in understanding the multiplicity distribution of the exoplanet population (Zink et al. 2019). The candidates on this list are anticipated to generate RV amplitudes of 0.2-18 m/s, many within the range accessible to current facilities.

References in corpus (4)

• 197 Candidates and 104 Validated Planets in K2's First Five Fields
• Accounting for Incompleteness due to Transit Multiplicity in Kepler Planet Occurrence Rates
• The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists
• Planet Candidates from K2 Campaigns 5-8 and Follow-Up Optical Spectroscopy

Cited by in corpus (12)

• Scaling K2. VI. Reduced Small Planet Occurrence in High Galactic Amplitude Stars
• 37 New Validated Planets in Overlapping K2 Campaigns
• The K2-OjOS Project: New and revisited planets and candidates in K2 campaigns 5, 16, & 18
• Scaling K2. IV. A Uniform Planet Sample for Campaigns 1-8 and 10-18
• Another Shipment of Six Short-Period Giant Planets from TESS
• Transit least-squares survey -- II. Discovery and validation of 17 new sub- to super-Earth-sized planets in multi-planet systems from K2
• Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler
• Planetary candidates transiting cool dwarf stars from Campaigns 12 to 15 of K2
• K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13
• Scaling K2. V. Statistical Validation of 60 New Exoplanets From K2 Campaigns 2-18
• The Visual Survey Group: A Decade of Hunting Exoplanets and Unusual Stellar Events with Space-Based Telescopes
• The SATCHEL pipeline: A general tool for data classified through citizen science