Validation of a Temperate Fourth Planet in the K2-133 Multi-planet System
arXiv:1905.05206 · doi:10.1093/mnras/stz1334
Abstract
We present follow-up observations of the K2-133 multi-planet system. Previously, we announced that K2-133 contained three super-Earths orbiting an M1.5V host star - with tentative evidence of a fourth outer-planet orbiting at the edge of the temperate zone. Here we report on the validation of the presence of the fourth planet, determining a radius of R. The four planets span the radius gap of the exoplanet population, meaning further follow-up would be worthwhile to obtain masses and test theories of the origin of the gap. In particular, the trend of increasing planetary radius with decreasing incident flux in the K2-133 system supports the claim that the gap is caused by photo-evaporation of exoplanet atmospheres. Finally, we note that K2-133 e orbits on the edge of the stars temperate zone, and that our radius measurement allows for the possibility that this is a rocky world. Additional mass measurements are required to confirm or refute this scenario.
arXiv commentAccepted for publication in MNRAS
References in corpus (49)
- emcee: The MCMC Hammer
- Gaia Data Release 2. Summary of the contents and survey properties
- MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
- Analytic Lightcurves for Planetary Transit Searches
- MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
- Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
- The California-Kepler Survey. III. A Gap in the Radius Distribution of Small Planets
- The PLATO 2.0 Mission
- SparsePak: A Formatted Fiber Field Unit for The WIYN Telescope Bench Spectrograph. I. Design, Construction, and Calibration
- batman: BAsic Transit Model cAlculatioN in Python
- A Method of Correcting Near-Infrared Spectra for Telluric Absorption
- A box-fitting algorithm in the search for periodic transits
- Kepler planets: a tale of evaporation
- Most 1.6 Earth-Radius Planets are not Rocky
- The Infrared Telescope Facility (IRTF) Spectral Library: Cool Stars
- How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
- The TESS Input Catalog and Candidate Target List
- Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
- An Infrared Spectroscopic Sequence of M, L and T Dwarfs
- A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
- The Mass-Radius Relation for 65 Exoplanets Smaller than 4 Earth Radii
- The California Kepler Survey VII. Precise Planet Radii Leveraging Gaia DR2 Reveal the Stellar Mass Dependence of the Planet Radius Gap
- An asteroseismic view of the radius valley: stripped cores, not born rocky
- The Role of Core Mass in Controlling Evaporation: the Kepler Radius Distribution and the Kepler-36 Density Dichotomy
- How to Constrain Your M dwarf II: the mass-luminosity-metallicity relation from 0.075 to 0.70
- The nature of the TRAPPIST-1 exoplanets
- Almost All of Kepler's Multiple Planet Candidates are Planets
- Stellar Limb-Darkening Coefficients for CoRot and Kepler
- An Efficient Automated Validation Procedure for Exoplanet Transit Candidates
- CHEOPS: A Transit Photometry Mission for ESA's Small Mission Programme
- 197 Candidates and 104 Validated Planets in K2's First Five Fields
- K2SC: Flexible systematics correction and detrending of K2 light curves using Gaussian Process regression
- KOI-142, the King of Transit Variations, is a Pair of Planets near the 2:1 Resonance
- Secure TTV Mass Measurements: Ten Kepler Exoplanets between 3 and 8 Earth Masses with Diverse Densities and Incident Fluxes
- On Correlated-noise Analyses Applied To Exoplanet Light Curves
- An update to the EVEREST K2 pipeline: Short cadence, saturated stars, and Kepler-like photometry down to Kp = 15
- Zodiacal Exoplanets in Time (ZEIT) V: A Uniform Search for Transiting Planets in Young Clusters Observed by K2
- Transit timing to first order in eccentricity
- 60 Validated Planets from K2 Campaigns 5-8
- K2-136: A Hyades Binary Star with a Neptune-sized Planet
- On the protection of extrasolar Earth-like planets around K/M stars against galactic cosmic rays
- Three Small Super-Earths Transiting the nearby star GJ 9827
- Masses and radii for the three super-Earths orbiting GJ 9827, and implications for the composition of small exoplanets
- Roche tomography of cataclysmic variables: I. artefacts and techniques
- Mass determination of the 1:3:5 near-resonant planets transiting GJ 9827 (K2-135)
- Efficient, uninformative sampling of limb-darkening coefficients for a three-parameter law
- The Transit Spectra of Earth and Jupiter
- Magellan/PFS Radial Velocities of GJ 9827, a late K dwarf at 30 pc with Three Transiting Super-Earths
- Three small transiting planets around the M dwarf host star LP 358-499