STELLAR AND PLANETARY PROPERTIES OF K2 CAMPAIGN 1 CANDIDATES AND VALIDATION OF 17 PLANETS, INCLUDING A PLANET RECEIVING EARTH-LIKE INSOLATION

ABSTRACT The extended Kepler mission, K2, is now providing photometry of new fields every three months in a search for transiting planets. In a recent study, Foreman-Mackey and collaborators presented a list of 36 planet candidates orbiting 31 stars in K2 Campaign 1. In this contribution, we present...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2015-08, Vol.809 (1), p.1-15
Main Authors: Montet, Benjamin T., Morton, Timothy D., Foreman-Mackey, Daniel, Johnson, John Asher, Hogg, David W., Bowler, Brendan P., Latham, David W., Bieryla, Allyson, Mann, Andrew W.
Format: Article
Language:English
Subjects:
Adaptive optics
Extrasolar planets
Photometry
planetary systems
Planets
planets and satellites: detection
Receiving
Searching
Source code
Stars
stars: fundamental parameters
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:ABSTRACT The extended Kepler mission, K2, is now providing photometry of new fields every three months in a search for transiting planets. In a recent study, Foreman-Mackey and collaborators presented a list of 36 planet candidates orbiting 31 stars in K2 Campaign 1. In this contribution, we present stellar and planetary properties for all systems. We combine ground-based seeing-limited survey data and adaptive optics imaging with an automated transit analysis scheme to validate 21 candidates as planets, 17 for the first time, and identify 6 candidates as likely false positives. Of particular interest is K2-18 (EPIC 201912552), a bright (K = 8.9) M2.8 dwarf hosting a 2.23 0.25 planet with K and an orbital period of 33 days. We also present two new open-source software packages which enable this analysis. The first, isochrones, is a flexible tool for fitting theoretical stellar models to observational data to determine stellar properties using a nested sampling scheme to capture the multimodal nature of the posterior distributions of the physical parameters of stars that may plausibly be evolved. The second is vespa, a new general-purpose procedure to calculate false positive probabilities and statistically validate transiting exoplanets.
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.1088/0004-637X/809/1/25