Chemical kinetics on extrasolar planets

Chemical kinetics on extrasolar planets.

Chemical kinetics plays an important role in controlling the atmospheric composition of all planetary atmospheres, including those of extrasolar planets. For the hottest exoplanets, the composition can closely follow thermochemical-equilibrium predictions, at least in the visible and infrared photosphere at dayside (eclipse) conditions. However, for atmospheric temperatures approximately <2000K...

Magnetospheric Emissions from Extrasolar Planets Magnetospheric Emission from Extrasolar Planets

Extrasolar Carbon Planets

We suggest that some extrasolar planets . 60 M will form substantially from silicon carbide and other carbon compounds. Pulsar planets and low-mass white dwarf planets are especially good candidate members of this new class of planets, but these objects could also conceivably form around stars like the Sun. This planet-formation pathway requires only a factor of two local enhancement of the pro...

Five New Extrasolar Planets

We report multiple Doppler measurements of five nearby FGK main-sequence stars and subgiants obtained during the past 4–6 yr at the Keck Observatory. These stars, namely, HD 183263, HD 117207, HD 188015, HD 45350, and HD 99492, all exhibit coherent variations in their Doppler shifts consistent with a planet in Keplerian motion. The five new planets occupy known realms of planetary parameter spa...

Extrasolar Planets Jonathan I

NOTES: (a) JWST numbers appropriate to the assumptions in their updated Science Requirements Document must be calculated; (b) the GSMT sensitivity calculations must be ‘scrubbed’ to ensure that the assumptions re detectors; atmosphere; emissivity are duly conservative; and (c) the expected. performance of the JWST NIR coronagraph needs to be folded in. Please review with these caveats in mind (...