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hpparvi / ldtk

Python toolkit for calculating stellar limb darkening profiles and model-specific coefficients using the stellar atmosphere spectrum library by Husser et al. (2013). Described in Parviainen & Aigrain, MNRAS 453, 3821–3826 (2015).
GNU General Public License v2.0
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working past 2 mirons #11

Closed awmann closed 3 years ago

awmann commented 7 years ago

ldtk appears to fail when trying to estimate limb-darkening parameters past 2-3 microns. I assumed this was actually an issue with the Husser models, but the version I have go out to 5.5 microns, suggesting the issue is with ldtk.

pearsonkyle commented 5 years ago

Can confirm, I am having trouble generating coefficients within the Spitzer IRAC bandpasses

hpparvi commented 5 years ago

I had completely forgotten about this, sorry! I'll look into this tomorrow.

hpparvi commented 5 years ago

Can you give me an example of a specific intensity spectrum going out to 5.5 microns? The latest SI data that I know (and what LDTk is using) is the original one announced here

http://phoenix.astro.physik.uni-goettingen.de/?p=102

awmann commented 5 years ago

You're right; weirdly the spectra go to 5.5 microns, but the specific intensities only go to 2.6 microns. I don't quite understand why these differ, but the Phoenix group should be able to calculate the intensities out further if they generated the spectra. BT-SETTL (https://phoenix.ens-lyon.fr/Grids/BT-Settl/) seems to go considerably further (~10 microns) for their spectra, but I don't see specific intensities at all. I'll write them an email and see.

awmann commented 5 years ago

From Tim Husser: Unfortunately, to extract the specific intensities, I'd have to run Phoenix again and I haven't done that in 5 years or so. Problem is that our computing department changed quite a lot during that time (new compilers, new job system, etc). Since we also would like to change some things, I started working on this, but haven't finished yet (and don't see any spare time to do so in the near future). So all I can offer you at the moment is to let you know whenever I get everything running again.

awmann commented 4 years ago

If I can get the specific intensities, can you add them? I got the Phoenix group to generate them.

hpparvi commented 4 years ago

Hi Andrew,

This is great news! I can make sure LDTk works with the specific intensities if you're storing them locally, and I can add full support for downloading only the needed files if the new spectra can be hosted somewhere (preferably in a FTP server).

awmann commented 4 years ago

Here's a test one: http://trash.husser.de/lte06000-4.50-0.0.PHOENIX-ACES-AGSS-COND-2011-SpecInt.fits is that format good? Note the headers need fixing.

hpparvi commented 4 years ago

Yes, the file format is the same as before and the most important information is already in the header. I can make LDTk to parse the stellar parameters from the filename if they're not available in the header.

Adding support for these spectra should not need any major changes, so I might be able to do it this week. Is the whole dataset accessible somewhere?

awmann commented 4 years ago

Awesome. Not fully ready yet. Tim is generating a few and I'm checking to make sure they don't look crazy before he makes the whole set. It might take a while to get the full grid.

hpparvi commented 4 years ago

Ok, excellent. If Tim is doing this, he might be able to host them in the same FTP as the old spectra. Keep me in the loop so I can make sure LDTk can use the new grid as soon as it's ready.

awmann commented 4 years ago

It should all be here: ftp://phoenix.astro.physik.uni-goettingen.de/v3.0/SpecIntFITS/

hpparvi commented 4 years ago

Beautiful! Please checkout branch v1.5 and install. LDTk willl use the new spectra if you initialize LDPSetCreator with argument dataset='visir'. I'll merge this to the master branch when I'm sure this doesn't break anything for anyone.

These spectra are twice as large as the old ones, but I'll create a binned "lowres" version of the dataset the way I did with the old spectra (I'll try to get this done this week).

awmann commented 4 years ago

I just ran a few tests on systems we have already analyzed, and the output parameters are pretty close to my expectations. I'd say it's working properly!

hpparvi commented 4 years ago

Excellent! I'll do some more tests this week and create a new release, but feel free to start using the v1.5 branch already.

I'll also ask Tim if he's ok hosting the low-res versions of the new spectra, in which case the dataset argument will have four options in v1.5 (vis, vis-lowres, visir, visir-lowres).