Estimating Planetary Mass with Deep Learning

Abstract

While thousands of exoplanets have been confirmed, the known properties about individual discoveries remain sparse and depend on detection technique. To utilize more than a small section of the exoplanet dataset, tools need to be developed to estimate missing values based on the known measurements. Here, we demonstrate the use of a neural network that models the density of planets in a space of six properties that is then used to impute a probability distribution for missing values. Our results focus on planetary mass which neither the radial velocity nor transit techniques for planet identification can provide alone. The neural network can impute mass across the four orders of magnitude in the exoplanet archive, and return a distribution of masses for each planet that can inform about trends in the underlying dataset. The average error on this mass estimate from a radial velocity detection is a factor of 1.5 of the observed value, and 2.7 for a transit observation. The mass of Proxima Centauri b found by this method is $1.6_{-0.36}^{+0.46}$ M${}_{\oplus }$, where the upper and lower bounds are derived from the root mean square deviation from the log mass probability distribution. The network can similarly impute the other potentially missing properties, and we use this to predict planet radius for radial velocity measurements, with an average error of a factor 1.4 of the observed value. The ability of neural networks to search for patterns in multidimensional data means that such techniques have the potential to greatly expand the use of the exoplanet catalogue.

17 page, 15 figures, accepted for publication in AJ

References in corpus (30)

• Habitable Zones Around Main-Sequence Stars: New Estimates
• A terrestrial planet candidate in a temperate orbit around Proxima Centauri
• Most 1.6 Earth-Radius Planets are not Rocky
• The Occurrence Rate of Small Planets around Small Stars
• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• 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
• The Role of Core Mass in Controlling Evaporation: the Kepler Radius Distribution and the Kepler-36 Density Dichotomy
• Accurate, Empirical Radii and Masses of Planets and their Host Stars with Gaia Parallaxes
• Identifying Exoplanets with Deep Learning: A Five Planet Resonant Chain around Kepler-80 and an Eighth Planet around Kepler-90
• The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets
• The Compositional Diversity of Extrasolar Terrestrial Planets: I. In-Situ Simulations
• KELT-1b: A Strongly Irradiated, Highly Inflated, Short Period, 27 Jupiter-mass Companion Transiting a mid-F Star
• The habitability of Proxima Centauri b II. Possible climates and Observability
• CHEOPS: A Transit Photometry Mission for ESA's Small Mission Programme
• Densities and Eccentricities of 139 Kepler Planets from Transit Time Variations
• High Precision Dynamical Masses of Very Low Mass Binaries
• Searching for Exoplanets Using Artificial Intelligence
• The Habitable Zone Gallery
• Transit Timing Variation of Near-Resonance Planetary Pairs. II. Confirmation of 30 planets in 15 Multiple Planet Systems
• Kepler-21b: A rocky planet around a V = 8.25 magnitude star
• No Conclusive Evidence for Transits of Proxima b in MOST photometry
• Compact multi-planet systems are more common around metal poor hosts
• K2-66b and K2-106b: Two extremely hot sub-Neptune-size planets with high densities
• OGLE-TR-211 - a new transiting inflated hot Jupiter from the OGLE survey and ESO LP666 spectroscopic follow-up program
• The Pale Green Dot: A Method to Characterize Proxima Centauri b using Exo-Aurorae
• Understanding stellar activity-induced radial velocity jitter using simultaneous K2 photometry and HARPS RV measurements
• Proxima Centauri b is not a transiting exoplanet
• Detecting Proxima b's atmosphere with JWST targeting CO2 at 15 micron using a high-pass spectral filtering technique
• On the Orbital Inclination of Proxima Centauri b

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