A comprehensive comparison of the Sun to other stars: searching for self-selection effects

Abstract

If the origin of life and the evolution of observers on a planet is favoured by atypical properties of a planet's host star, we would expect our Sun to be atypical with respect to such properties. The Sun has been described by previous studies as both typical and atypical. In an effort to reduce this ambiguity and quantify how typical the Sun is, we identify eleven maximally-independent properties that have plausible correlations with habitability, and that have been observed by, or can be derived from, sufficiently large, currently available and representative stellar surveys. By comparing solar values for the eleven properties, to the resultant stellar distributions, we make the most comprehensive comparison of the Sun to other stars. The two most atypical properties of the Sun are its mass and orbit. The Sun is more massive than 95 -/+ 2% of nearby stars and its orbit around the Galaxy is less eccentric than 93 +/- 1% of FGK stars within 40 parsecs. Despite these apparently atypical properties, a chi^2 -analysis of the Sun's values for eleven properties, taken together, yields a solar chi^2 = 8.39 +/- 0.96. If a star is chosen at random, the probability that it will have a lower value (be more typical) than the Sun, with respect to the eleven properties analysed here, is only 29 +/- 11%. These values quantify, and are consistent with, the idea that the Sun is a typical star. If we have sampled all reasonable properties associated with habitability, our result suggests that there are no special requirements for a star to host a planet with life.

arXiv commentPublished in the Astrophysical Journal, 684:691-706, 2008 September 1. This version corrects two small errors the press could not correct before publication - the errors are addressed in an erratum ApJ will release on Dec 1, 2008

References in corpus (31)

• Stellar mass-to-light ratios and the Tully-Fisher relation
• The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems
• On the normalisation of the cosmic star formation history
• The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs
• Local stellar kinematics from Hipparcos data
• The 'Forbidden' Abundance of Oxygen in the Sun
• The Chemical Compositions of Galactic Disk F and G Dwarfs
• SINFONI in the Galactic Center: young stars and IR flares in the central light month
• alpha-, r-, and s-process element trends in the Galactic thin and thick disks
• Chromospheric CaII Emission in Nearby F, G, K, and M stars
• How Dry is the Brown Dwarf Desert?: Quantifying the Relative Number of Planets, Brown Dwarfs and Stellar Companions around Nearby Sun-like Stars
• The Galactic Habitable Zone and the Age Distribution of Complex Life in the Milky Way
• On the mass-to-light ratio of the local Galactic disc and the optical luminosity of the Galaxy
• The Galactic Habitable Zone I. Galactic Chemical Evolution
• Patterns of photometric and chromospheric variation among Sun-like stars: A 20-year perspective
• Oxygen Abundances in Nearby Stars. Clues to the formation and evolution of the Galactic disk
• The Solar Motion Relative to the Local Group
• Galaxy groups in the 2dFGRS: the luminous content of the groups
• The solar neighbourhood age-metallicity relation - does it exist?
• Disk M Dwarf Luminosity Function From HST Star Counts
• The origin and chemical evolution of carbon in the Galactic thin and thick disks
• The recent star formation history of the Hipparcos solar neighbourhood
• On the Nature of Stars with Planets
• Kinematics of the Outer Stellar Halo
• The K-band luminosity function of nearby field galaxies
• Searching for Earth analogues around the nearest stars: the disk age-metallicity relation and the age distribution in the Solar Neighbourhood
• An Intermittent Star Formation History in a 'Normal' Disk Galaxy: The Milky Way
• Modeling complete distributions with incomplete observations: The velocity ellipsoid from Hipparcos data
• The Shape and Scale of Galactic Rotation from Cepheid Kinematics
• The Metallicity of Stars with Close Companions
• Variation of the IMF

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• The chemical composition of the Sun
• The peculiar solar composition and its possible relation to planet formation
• Stellar Abundances in the Solar Neighborhood: The Hypatia Catalog
• The Long-term Evolution of the Galactic Disk Traced by Dissolving Star Clusters
• Solar structure and evolution
• A Model of Habitability Within the Milky Way Galaxy
• Are the distributions of Fast Radio Burst properties consistent with a cosmological population?
• Physical constraints for the evolution of life on exoplanets
• Terrestrial planets across space and time
• Populating the brown dwarf and stellar boundary: Five stars with transiting companions near the hydrogen-burning mass limit
• Lithium abundance and rotation of seismic solar analogues - Solar and stellar connection from Kepler and Hermes observations
• Is Life Most Likely Around Sun-like Stars?
• Copernicanism and the Typicality in Time
• A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113
• New Suns in the Cosmos?
• Rotation period distribution of CoRoT and Kepler Sun-like stars
• Tidally driven tectonic activity as a parameter in exoplanet habitability
• Beyond Mediocrity: How Common is Life?
• Geoastronomy: Rocky planets as the Lavosier-Lomonosov Bridge from the non-living to the living world