Spectral Properties of Brown Dwarfs and Unbound Planetary Mass Objects
Brown dwarfs overlap in effective temperature, luminosity, and mass with both the lowest mass stars and the highest mass planets. Specifically, young brown dwarfs and directly imaged exoplanets have enticingly similar photometric and spectroscopic characteristics, indicating that their cool, low gravity atmospheres should be studied in concert. Similarities between the peculiar-shaped H band, near and mid-IR photometry, and location on color magnitude diagrams provide important clues about how to extract physical properties of planets from current brown dwarf observations. In this chapter, objects newly assigned to 10–150 Myr nearby moving groups – many of which are unbound planetary mass objects – will be discussed, the diversity of this uniform age-calibrated brown dwarf sample will be highlighted, and the implication for understanding current and future planetary data will be reflected upon.
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