Biosignature Surveys to Exoplanet Yields and Beyond
arXiv:2005.04005 · doi:10.1093/mnras/staa1284
Abstract
Upcoming biosignature searches focus on indirect indicators to infer the presence of life on other worlds. Aside from just signaling the presence of life, however, some biosignatures can contain information about the state that a planet's biosphere has achieved. This additional information can be used to measure what fractions of planets achieve certain key stages, corresponding to the advent of life, photosynthesis, multicellularity, and technological civilization. We forecast the uncertainties of each measurement for upcoming surveys, and outline the key factors that determine these uncertainties. Our approach is probabilistic and relies on large numbers of candidates rather than detailed examination of individual exoplanet spectra. The dependence on survey size, likeliness of the transition, and several measures of degrees of confidence are discussed, including discussion of geological false positives in biosignatures as well as how combining data from different missions can affect the inference. Our analysis should influence policy recommendations for future mission design and strategy to minimize the impact of measurement uncertainties.
17 pages, 9 figures, accepted to MNRAS
References in corpus (20)
- The James Webb Space Telescope
- Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
- Extreme Water Loss and Abiotic O Buildup On Planets Throughout the Habitable Zones of M Dwarfs
- Vegetation's Red Edge: A Possible Spectroscopic Biosignature of Extraterrestrial Plants
- Spectral signatures of photosynthesis I: Review of Earth organisms
- Spectral signatures of photosynthesis II: coevolution with other stars and the atmosphere on extrasolar worlds
- Abiotic oxygen-dominated atmospheres on terrestrial habitable zone planets
- Maximizing the ExoEarth Candidate Yield from a Future Direct Imaging Mission
- Disequilibrium biosignatures over Earth history and implications for detecting exoplanet life
- Detection of circular polarization in light scattered from photosynthetic microbes
- Pale Orange Dots: The Impact of Organic Haze on the Habitability and Detectability of Earthlike Exoplanets
- The LUVOIR Mission Concept Study Final Report
- The Ĝ Infrared Search for Extraterrestrial Civilizations with Large Energy Supplies. II. Framework, Strategy, and First Result
- Detecting industrial pollution in the atmospheres of earth-like exoplanets
- A Limited Habitable Zone for Complex Life
- Atmospheric Beacons of Life from Exoplanets Around G and K Stars
- Rounding up the wanderers: optimizing coronagraphic searches for extrasolar planets
- Target Selection for the LBTI Exozodi Key Science Program
- NASA and the Search for Technosignatures: A Report from the NASA Technosignatures Workshop
- Detecting 3D vegetation structure with the Galileo space probe: Can a distant probe detect vegetation structure on Earth?