03-13-2020, 08:09 AM | #11 |
Join Date: Dec 2017
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Re: [Space] Climate & habitability of tide-locked planets
I don't know if this is scientifically valid--I'm not enough of an expert--but it looks plausible--certainly sufficient for gaming. Here's a well thought out tide-locked world which keeps in mind the fact that orbits are usually not circular.
http://www.worlddreambank.org/L/LIB.HTM http://www.worlddreambank.org/P/PLANETS.HTM has a lot of neat concepts :) |
03-13-2020, 06:23 PM | #12 |
Join Date: May 2005
Location: Oz
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Re: [Space] Climate & habitability of tide-locked planets
Figure 2 in Merlis & Schneider (op. cit.) shows a small area (at the middle of the day side of the slow-rotating planet, made up of two narrow arcs north-east and south-east of the subsolar point on the fast-rotating one) with 62.5 mm of precipitation per day. That is very rainy. That is twice as much rain as the rainiest place on Earth. But it falls over only a very small area. Most of the zone indicated as getting an excess of rainfall over potential evaporation gets between 12.5 mm per day and 62.5 mm per day. That seems like a lot of rain to me — the town where I live gets an average of 1128 mm per year or 3 mm per day. Seathwaite Farm in Cumbria gets 3350 mm per year (9.2 mm per day). No doubt I would find it dismal. But even Megahalaya in India is far from being incapable of supporting plant life.
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03-13-2020, 06:40 PM | #13 | ||
Join Date: May 2005
Location: Oz
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Re: [Space] Climate & habitability of tide-locked planets
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03-13-2020, 06:56 PM | #14 | |
Join Date: Dec 2007
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Re: [Space] Climate & habitability of tide-locked planets
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Which overlooks the biggest issue impacting habitability there of course, the periodic blasts of radiation from the sun. Last edited by David Johnston2; 03-13-2020 at 07:57 PM. |
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03-13-2020, 09:05 PM | #15 | |||
Join Date: May 2005
Location: Oz
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Re: [Space] Climate & habitability of tide-locked planets
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The thing that brought this issue to the forefront of my mind just now is trying to generate a society (and adventure) for Gliese 370 II "Persatuan", the highest-Habitability tide-locked world in Central Sector of my randomly-generated universe. It has an average temperature of 27 C, and a calculated dayside temperature of 67 C. Quote:
What is it in Space that makes you think that latitude makes a significant difference? Did I miss something big, or are you bringing in more recent discoveries from other sources? Quote:
There is still a lot to find out about the planets of M and late K -type dwarf stars — twenty years ago it was still not clear that they were common at all! — but I'm not really holding my breath on the discovery of planets habitable by humans in the system of anything cooler than about K5.
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03-13-2020, 10:29 PM | #16 | |||||
Join Date: Dec 2007
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Re: [Space] Climate & habitability of tide-locked planets
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03-13-2020, 10:59 PM | #17 |
Join Date: Feb 2016
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Re: [Space] Climate & habitability of tide-locked planets
One possibility for a tide-locked planet that is not often talked about is a planet with a 90-degree axis that 'rolls' as it revolves around its star (the north pole is always pointed at the star, the south pole is always pointed away, and the equator is the terminus). In recent reports though, there are some rather massive differences in temperature between the night side and dark side of directly observed tide-locked planets with very dense atmospheres. I am not sure if the mathematical models of previous research actually reflect reality.
For example, there is a planet where molten iron replaces water, and it possesses a day side with temperatures 150% higher than the night side. The molten iron vaporizes in the dayside, rains down at the terminus, and freezes on the night side. Of course, iron gas is much less reflective than water vapor, so that would drive up the day side temperatures, but it is an amazing planet. Another thing to consider is the placement of continents. A 'polar' ocean would moderate day side temperatures through evaporation and reflective cloud cover, as well as being an effective method of transferring heat to the night side. Conversely, a 'polar' continent would be an inferno, and the rest of the planet would likely be uninhabitable outside of the terminus because there would be insufficient heat transfer. Of course, the tidal bulge caused by the tide locking would likely result in a polar continent, meaning that most tide-locked planets are likely uninhabitable outside of the terminus. |
03-14-2020, 12:05 AM | #18 | |
Join Date: Dec 2006
Location: Meifumado
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Re: [Space] Climate & habitability of tide-locked planets
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- The subsolar and anti-subsolar points (which I like to call the day-pole and night-pole). The equator passes through both these points. - The north and south poles. These point up and down from the planet's orbital plane, and are located on the terminator. The planet's rotational axis, due to its orbiting its star, passes through these poles. - The east and west poles (for lack of clearer names). These would be the leading and trailing points in the planet's orbit. They'd be on the intersections of the equator and terminus. They might be significant for climatic patterns to gather at due to Coriolis forces. These points might vary due to orbital eccentricity, libration, etc. I'm not sure if the academic literature uses these terms exactly though.
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03-14-2020, 12:57 AM | #19 | |||
Join Date: May 2005
Location: Oz
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Re: [Space] Climate & habitability of tide-locked planets
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 03-14-2020 at 01:13 AM. |
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03-14-2020, 12:58 AM | #20 | |||||
Join Date: May 2005
Location: Oz
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Re: [Space] Climate & habitability of tide-locked planets
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I really don't believe that the twilit band near the terminator is likely to be highly habitable, for reasons that I have explained at length. That area is going to be poor in light to drive photosynthesis (a problem exacerbated by the low photosynthetic efficiency of the light from cool stars). And the modelling all shows that it is likely to be arid, too. The results of global circulation modelling suggest to me that the best prospect for settling on tide-locked worlds is on the sunlit faces of comparatively cool ones.
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 03-14-2020 at 05:18 AM. |
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flat black, habitability, planet generation, space, system generation |
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