Comments on: Toe The Line https://briankoberlein.com/2016/07/14/toe-the-line/ Brian Koberlein Tue, 19 Feb 2019 13:26:59 +0000 hourly 1 https://wordpress.org/?v=5.0.3 By: jonesdave https://briankoberlein.com/2016/07/14/toe-the-line/#comment-4279 Sun, 17 Jul 2016 18:01:14 +0000 https://briankoberlein.com/?p=6087#comment-4279 Something else occurred to me while I thought about this; there were the grains of refractory material collected by the Stardust mission at comet Wild 2. If this process we are observing at V883 also occurred in our own star’s past, I wonder if that may account for these refractory grains? Just a thought.

]]> By: jonesdave https://briankoberlein.com/2016/07/14/toe-the-line/#comment-4278 Sun, 17 Jul 2016 15:40:02 +0000 https://briankoberlein.com/?p=6087#comment-4278 Just for clarity, I suppose I should point out that by “ice” in my previous reply, I was specifically using the example of H2O ice. The distances and temperatures I’ve used there will not hold true for different types of ice. For example, CO ice sublimates at ~30 K. Therefore CO ice will not form where temperatures exceed that value, which will be a lot further out than 3-4 AU.

]]> By: jonesdave https://briankoberlein.com/2016/07/14/toe-the-line/#comment-4277 Sun, 17 Jul 2016 15:28:13 +0000 https://briankoberlein.com/?p=6087#comment-4277 The ice line is the point beyond which ice can exist. That is, H2O vapour can condense onto grains of dust and form ice. This is dependent upon temperature. H2O ice will start to sublimate at ~ 150 K. Above that temperature ice cannot form. The distance at which that temperature is exceeded will vary, depending upon the luminosity (i.e. temperature) of the host star.In our system it is not hard to do a little bit of maths to show that this is around 3-4 AU. Around a Red Dwarf it’ll be closer; around an ‘O’ type star it’ll be further

]]> By: Richk https://briankoberlein.com/2016/07/14/toe-the-line/#comment-4276 Sat, 16 Jul 2016 14:30:10 +0000 https://briankoberlein.com/?p=6087#comment-4276 so/how/do/you/predict/the/ice/line?

]]> By: Jean Tate https://briankoberlein.com/2016/07/14/toe-the-line/#comment-4272 Thu, 14 Jul 2016 21:14:14 +0000 https://briankoberlein.com/?p=6087#comment-4272 Very nice result!

In a protoplanetary disk which has (relatively) more C than O, I guess there would be a rather different ‘ice’ (or ‘snow’) line … that where methane or ammonia (or some more complex molecule?) ‘freezes’ out (though there’d still be some water/ice/snow, I guess).

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