Two Planets Straddling the Habitable Zone of The Nearby K Dwarf Gl 414A

Abstract

We present the discovery of two planets orbiting the nearby (D=11.9 pc) K7 dwarf Gl 414A. Gl 414A b is a sub-Neptune mass planet with M${}_b\sin i_b=9.28_{-2.54}^{+3.19}$ M${}_{\oplus }$ and a semi-major axis of 0.24 $\pm$ 0.01 au. Gl 414A c is a sub-Saturn mass planet with $M_c\sin i_c=59.48_{-9.69}^{+9.98}$ M${}_{\oplus }$ and a semi-major axis of 1.43 $\pm$ 0.06 au. We jointly analyzed radial velocity data from Keck/HIRES and the Automated Planet Finder at Lick Observatory, as well as photometric data from KELT, to detect the two planets as well as two additional signals related to the rotationally-modulated activity and the long term magnetic activity cycle of the star. The outer planet in this system may be a potential candidate for future direct imaging missions.

arXiv comment14 pages, 9 figures, Submitted to AJ; fixed typos and updated section 6.3

References in corpus (58)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The NumPy array: a structure for efficient numerical computation
• The chemical composition of the Sun
• Gaia Data Release 2. Summary of the contents and survey properties
• Validation of the new Hipparcos reduction
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• Habitable Zones Around Main-Sequence Stars: New Estimates
• Shrinking binary and planetary orbits by Kozai cycles with tidal friction
• REBOUND: An open-source multi-purpose N-body code for collisional dynamics
• Obliquities of Hot Jupiter host stars: Evidence for tidal interactions and primordial misalignments
• The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters
• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• The Mass-Radius Relation for 65 Exoplanets Smaller than 4 Earth Radii
• SPHERE: the exoplanet imager for the Very Large Telescope
• RadVel: The Radial Velocity Modeling Toolkit
• The California Kepler Survey VII. Precise Planet Radii Leveraging Gaia DR2 Reveal the Stellar Mass Dependence of the Planet Radius Gap
• Chromospheric Activity and Jitter Measurements for 2630 Stars on the California Planet Search
• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I
• WHFast: A fast and unbiased implementation of a symplectic Wisdom-Holman integrator for long term gravitational simulations
• The Kilodegree Extremely Little Telescope (KELT): A Small Robotic Telescope for Large-Area Synoptic Surveys
• How to Constrain Your M dwarf II: the mass-luminosity-metallicity relation from 0.075 to 0.70$M_{\odot }$
• The California-Kepler Survey. I. High Resolution Spectroscopy of 1305 Stars Hosting Kepler Transiting Planets
• Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library
• KELT-1b: A Strongly Irradiated, Highly Inflated, Short Period, 27 Jupiter-mass Companion Transiting a mid-F Star
• A Trend Filtering Algorithm for wide field variability surveys
• Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
• Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles
• The CARMENES search for exoplanets around M dwarfs: Different roads to radii and masses of the target stars
• On the Metal-Richness of M Dwarfs with Planets
• APF - The Lick Observatory Automated Planet Finder
• The California-Kepler Survey. II. Precise Physical Properties of 2025 Kepler Planets and Their Host Stars
• CARMENES input catalogue of M dwarfs V. Luminosities, colours, and spectral energy distributions
• Towards the Minimum Inner Edge Distance of the Habitable Zone
• A reanalysis of the Gaia Data Release 2 photometric sensitivity curves using HST/STIS spectrophotometry
• Abundances in the Local Region II: F, G and K Dwarfs and Subgiants
• An observational correlation between stellar brightness variations and surface gravity
• The Twenty-Five Year Lick Planet Search
• The NASA-UC Eta-Earth Program: I. A Super-Earth Orbiting HD 7924
• Metallicity of M dwarfs III. Planet-metallicity and planet-stellar mass correlations of the HARPS GTO M dwarf sample
• Kepler-21b: A rocky planet around a V = 8.25 magnitude star
• HAT-P-11: Discovery of a Second Planet and a Clue to Understanding Exoplanet Obliquities
• Planet-planet scattering as the source of the highest eccentricity exoplanets
• Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits
• MINESweeper: Spectrophotometric Modeling of Stars in the Gaia Era
• The discovery and mass measurement of a new ultra-short-period planet: EPIC~228732031b
• A Posteriori Transit Probabilities
• Dynamically hot Super-Earths from outer giant planet scattering
• The Albedos of Kepler's Close-in super-Earths
• A Catalog of Stellar Unified Properties (CATSUP) for 951 FGK-Stars Within 30 pc
• The Rotation-Activity Correlations in K and M dwarfs. I. Stellar parameters, compilations of $v\sin i$ and $P/\sin i$ for a large sample of late-K and M dwarfs
• Comprehensive Wide-Band Magnitudes and Albedos for the Planets, With Applications to Exo-Planets and Planet Nine
• Three Temperate Neptunes Orbiting Nearby Stars
• TESS Reveals HD 118203 b to be a Transiting Planet

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• The TIME Table: Rotation and Ages of Cool Exoplanet Host Stars
• Confirmation of the Long-Period Planet Orbiting Gliese 411 and the Detection of a New Planet Candidate
• The "Drake equation" of exomoons -- a cascade of formation, stability and detection
• Effects of Outer Giant Planets on In Situ Formation of Inner Super-Earths
• The California Legacy Survey III. On The Shoulders of (Some) Giants: The Relationship between Inner Small Planets and Outer Massive Planets