Atmospheres from very low-mass stars to extrasolar planets

Abstract

Within the next few years, several instruments aiming at imaging extrasolar planets will see first light. In parallel, low mass planets are being searched around red dwarfs which offer more favorable conditions, both for radial velocity detection and transit studies, than solar-type stars. We review recent advancements in modeling the stellar to substellar transition. The revised solar oxygen abundances and cloud models allow to reproduce the photometric and spectroscopic properties of this transition to a degree never achieved before, but problems remain in the important M-L transition characteristic of the effective temperature range of characterizable exoplanets.

submitted to Memorie della Societa Astronomica Italiana

References in corpus (13)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
• Evolution of low-mass star and brown dwarf eclipsing binaries
• Atomic and Molecular Opacities for Brown Dwarf and Giant Planet Atmospheres
• A comparison of chemistry and dust cloud formation in ultracool dwarf model atmospheres
• Ammonia as a tracer of chemical equilibrium in the T7.5 dwarf Gliese 570D
• M dwarfs: effective temperatures, radii and metallicities
• Consistent simulations of substellar atmospheres and non-equilibrium dust-cloud formation
• K-H_2 Quasi-molecular absorption detected in the T-dwarf epsilon Indi Ba
• Discovery of the Coolest Extreme Subdwarf
• Energy transport, overshoot, and mixing in the atmospheres of M-type main- and pre-main-sequence objects
• Twenty-three new ultra-cool subdwarfs from the Sloan Digital Sky Survey
• SDSS J125637-022452: a high proper motion L subdwarf

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