Bioverse: a simulation framework to assess the statistical power of future biosignature surveys

Abstract

Next-generation space observatories will conduct the first systematic surveys of terrestrial exoplanet atmospheres and search for evidence of life beyond Earth. While in-depth observations of the nearest habitable worlds may yield enticing results, there are fundamental questions about planetary habitability and evolution which can only be answered through population-level studies of dozens to hundreds of terrestrial planets. To determine the requirements for next-generation observatories to address these questions, we have developed Bioverse. Bioverse combines existing knowledge of exoplanet statistics with a survey simulation and hypothesis testing framework to determine whether proposed space-based direct imaging and transit spectroscopy surveys will be capable of detecting various hypothetical statistical relationships between the properties of terrestrial exoplanets. Following a description of the code, we apply Bioverse to determine whether an ambitious direct imaging or transit survey would be able to determine the extent of the circumstellar habitable zone and study the evolution of Earth-like planets. Given recent evidence that Earth-sized habitable zone planets are likely much rarer than previously believed (Pascucci et al. 2019), we find that space missions with large search volumes will be necessary to study the population of terrestrial and habitable worlds. Moving forward, Bioverse provides a methodology for performing trade studies of future observatory concepts to maximize their ability to address population-level questions, including and beyond the specific examples explored here.

arXiv comment29 pages, 11 figures, 5 tables. Accepted to AJ

References in corpus (66)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• emcee: The MCMC Hammer
• Galactic Stellar and Substellar Initial Mass Function
• The Transiting Exoplanet Survey Satellite
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• Habitable Zones Around Main-Sequence Stars: New Estimates
• Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
• The California-Kepler Survey. III. A Gap in the Radius Distribution of Small Planets
• The PLATO 2.0 Mission
• Bayes in the sky: Bayesian inference and model selection in cosmology
• Most 1.6 Earth-Radius Planets are not Rocky
• Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
• The Mass-Radius Relation for 65 Exoplanets Smaller than 4 Earth Radii
• The Transit Light Source Effect: False Spectral Features and Incorrect Densities for M-dwarf Transiting Planets
• Planetary Spectrum Generator: an accurate online radiative transfer suite for atmospheres, comets, small bodies and exoplanets
• Exoplanet Biosignatures: Understanding Oxygen as a Biosignature in the Context of Its Environment
• A stellar-mass-dependent drop in planet occurrence rates
• The Habitability of Planets Orbiting M-dwarf Stars
• Hydrogen Greenhouse Planets Beyond the Habitable Zone
• Probabilistic Mass-Radius Relationship for Sub-Neptune-Sized Planets
• Inevitability of Plate Tectonics on Super-Earths
• The Detectability and Characterization of the TRAPPIST-1 Exoplanet Atmospheres with JWST
• An Increase in the Mass of Planetary Systems around Lower-Mass Stars
• The cosmic shoreline: the evidence that escape determines which planets have atmospheres, and what this may mean for Proxima Centauri b
• Reconstructing the star formation history of the Milky Way disc(s) from chemical abundances
• The Occurrence of Rocky Habitable Zone Planets Around Solar-Like Stars from Kepler Data
• Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type
• Towards the Minimum Inner Edge Distance of the Habitable Zone
• Impact of Clouds and Hazes on the Simulated JWST Transmission Spectra of Habitable Zone Planets in the TRAPPIST-1 System
• On the Age of the TRAPPIST-1 System
• Outgassing on stagnant-lid super-Earths
• The LUVOIR Mission Concept Study Final Report
• Gaia DR2 reveals a star formation burst in the disc 2-3 Gyr ago
• A Volcanic Hydrogen Habitable Zone
• Occurrence Rates of Planets Orbiting M Stars: Applying ABC to Kepler DR25, Gaia DR2, and 2MASS Data
• False negatives for remote life detection on ocean-bearing planets: Lessons from the early Earth
• Transits and Occultations
• Exoplanet Classification and Yield Estimates for Direct Imaging Missions
• The atmospheric circulation and climate of terrestrial planets orbiting Sun-like and M-dwarf stars over a broad range of planetary parameters
• The runaway greenhouse radius inflation effect - An observational diagnostic to probe water on Earth-size planets and test the Habitable Zone concept
• Characterizing solar-type stars from full-length Kepler data sets using the Asteroseismic Modeling Portal
• A Statistical Comparative Planetology Approach to the Hunt for Habitable Exoplanets and Life Beyond the Solar System
• The Canada-France Imaging Survey: Reconstructing the Milky Way Star Formation History from its White Dwarf Population
• Clouds will likely prevent the detection of water vapor in JWST transmission spectra of terrestrial exoplanets
• A Joint Mass-Radius-Period Distribution of Exoplanets
• Carbonate-Silicate Cycle Predictions of Earth-like Planetary Climates and Testing the Habitable Zone Concept
• Dim Prospects for Transmission Spectra of Ocean Earths Around M Stars
• Origins Space Telescope Mission Concept Study Report
• Detectability of Molecular Signatures on TRAPPIST-1e through Transmission Spectroscopy Simulated for Future Space-Based Observatories
• A Thousand Earths: A Very Large Aperture, Ultralight Space Telescope Array for Atmospheric Biosignature Surveys
• The impact of stripped cores on the frequency of Earth-size planets in the habitable zone
• A Catalog of Spectra, Albedos, and Colors of Solar System Bodies for Exoplanet Comparison
• A mirage of the cosmic shoreline: Venus-like clouds as a statistical false positive for exoplanet atmospheric erosion
• Probing the capability of future direct imaging missions to spectrally constrain the frequency of Earth-like planets
• Frequency of planets orbiting M dwarfs in the Solar neighbourhood
• High-cadence spectroscopy of M-dwarfs - II. Searching for stellar pulsations with HARPS
• Directly imaged exoplanets in reflected starlight. The importance of knowing the planet radius
• The direct imaging search for Earth 2.0: Quantifying biases and planetary false positives
• Asteroseismology of the Multiplanet System K2-93
• Testing Earth-like atmospheric evolution on exo-Earths through oxygen absorption: required sample sizes and the advantage of age-based target selection
• M dwarf search for pulsations within Kepler GO program
• Asteroseismic Investigation of 20 Planet and Planet-Candidate Host Stars
• Identifying Exo-Earth Candidates in Direct Imaging Data through Bayesian Classification
• Exploring Other Worlds: Science Questions for Future Direct Imaging Missions (EXOPAG SAG15 Report)
• Non-detection of O${}_2$/O${}_3$ informs frequency of Earth-like planets with LUVOIR but not HabEx

Cited by in corpus (4)

• Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O${}_2$ Levels in Nearby Transiting Habitable Zone Exoplanets
• Bioverse: The Habitable Zone Inner Edge Discontinuity as an Imprint of Runaway Greenhouse Climates on Exoplanet Demographics
• Hierarchical Bayesian Atmospheric Retrieval Modeling for Population Studies of Exoplanet Atmospheres: A Case Study on the Habitable Zone
• Bioverse: Potentially Observable Exoplanet Biosignature Patterns Under the UV Threshold Hypothesis for the Origin of Life