Molten Iron and hot sand - it's not easy to think of something more extreme than this: http://www.nasa.gov/jpl/spitzer/brown-dwarf-20140107/ Add that to the high gravity of a small, dense Brown Dwarf. Theory predicts they can be as small as 0.75 RJup (if old enough) and much more massive.

I know, BDs are not planets. Howewer at some places, the boundaries are not well defined. Then, I imagine that a high mass planet close to or even above what the astronomers define as the minimum mass for a BD could have a similar weather. Or could it not?

This mass could be anywhere between 10 and 17 MJ depending on metallicity and other parameters. I saw this numbers in a paper at arxiv.org - sorry for not remembering it's name now. And it seems there are planets (???) heavier than that in the net lists.

Thanks to Jupiter's gravity, Io have a molten core and plenty of volcanoes. Now, what would be the climate of a planet that is subject to the much stronger pull of a pulsar or even a black hole? or the most extreme 'hot jovians' orbiting around an A/F star in few days (hours...) and with a temperature above 3000 K... Or going to another opposite, an ancient rogue world as cold as the circundant space or even colder (if immersed in the 'boomerang' nebula for instance) with enough atmosphere pressure to have pools of liquid Helium...

Molten Iron and hot sand - it's not easy to think of something more extreme than this. Add that to the high gravity of a small, dense Brown Dwarf. Theory predicts they can be as small as 0.75 RJup (if old enough) and much more massive.

I know, BDs are not planets. Howewer at some places, the boundaries are not well defined. Then, I imagine that a high mass planet close to or even above what the astronomers define as the minimum mass for a BD could have a similar weather. Or could it not?

This mass could be anywhere between 10 and 17 MJ depending on metallicity and other parameters. I saw this numbers in a paper at arxiv.org - sorry for not remembering it's name now. And it seems there are planets heavier than that in the net lists.

Thanks to Jupiter's gravity, Io have a molten core and plenty of volcanoes. Now, what would be the climate of a planet that is subject to the much stronger pull of a pulsar or even a black hole? or the most extreme 'hot jovians' orbiting around an A/F star in few days (or just hours) and with a temperature above 3000 K... Or going to another opposite, an ancient rogue world as cold as the circundant space or even colder (if immersed in the 'boomerang' nebula for instance) with enough atmosphere pressure to have pools of liquid Helium.

Molten Iron and hot sand - it's not easy to think of something more extreme than this: http://www.nasa.gov/jpl/spitzer/brown-dwarf-20140107/ Add that to the high gravity of a small, dense Brown Dwarf. Theory predicts they can be as small as 0.75 RJup (if old enough) and much more massive.

I know, BDs are not planets. Howewer at some places, the boundaries are not well defined. Then, I imagine that a high mass planet close to or even above what the astronomers define as the minimum mass for a BD could have a similar weather. Or could it not?

This mass could be anywhere between 10 and 17 MJ depending on metallicity and other parameters. I saw this numbers in a paper at arxiv.org - sorry for not remembering it's name now. And it seems there are planets (???) heavier than that in the net lists.

Molten Iron and hot sand - it's not easy to think of something more extreme than this: http://www.nasa.gov/jpl/spitzer/brown-dwarf-20140107/ Add that to the high gravity of a small, dense Brown Dwarf. Theory predicts they can be as small as 0.75 RJup (if old enough) and much more massive.

I know, BDs are not planets. Howewer at some places, the boundaries are not well defined. Then, I imagine that a high mass planet close to or even above what the astronomers define as the minimum mass for a BD could have a similar weather. Or could it not?

This mass could be anywhere between 10 and 17 MJ depending on metallicity and other parameters. I saw this numbers in a paper at arxiv.org - sorry for not remembering it's name now. And it seems there are planets (???) heavier than that in the net lists.

Thanks to Jupiter's gravity, Io have a molten core and plenty of volcanoes. Now, what would be the climate of a planet that is subject to the much stronger pull of a pulsar or even a black hole? or the most extreme 'hot jovians' orbiting around an A/F star in few days (hours...) and with a temperature above 3000 K... Or going to another opposite, an ancient rogue world as cold as the circundant space or even colder (if immersed in the 'boomerang' nebula for instance) with enough atmosphere pressure to have pools of liquid Helium...