Tracking the weather on an exoplanet

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Scientists have begun gathering increasingly detailed information about the atmosphere and weather on the exoplanet HD189733B, 63 light years away with an orbit that produces a transit every 2.2 days.

It appears that the temperature rises with increasing altitude, reaching 3,000 degrees at the top of the atmosphere. There are also strong winds blowing from the cold to the hot side of the planet.



  • PeterF

    “high-altitude winds blowing from the exoplanet’s hot day side to the cold night side with speeds of several kilometres per second”

    I wonder what the escape velocity is at “high-altitude” on this gas giant. Will the atmosphere eventually be blown away leaving an airless rocky core similar to mercury? Could this planetary system be similar to ours but in a much earlier stage of development?

  • Evidence from several hot Jupiter exoplanets already shows their atmospheres being driven away by the heat, including this particular exoplanet.

    As for whether this planetary system is like ours but in an earlier stage of development, this is not likely, though certainly not known for sure. The planetary arrangements of this particular system now is very different than anything presently theorized for the early solar system.

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