[BART-user] Running BA***@di***ransit depths?

[aj-foster]

The following is an archived message from the BART-user mailing list, which has now closed.

From: cl***@as*** (clh93)
Date: Wed, 25 Jan 2017 12:28:38 +0000
Subject: [BART-user] Running BA***@di***ransit depths?

Hi,

I'm in the process of trying to use BART to test some data I have. I'm
really very impressed with it so far, I'd really like to be able to use
it in my work. I'm able to get the examples to run quite well, but I'm
having a problem putting in my own data.

If I use the HD209458 example everything runs fine. However if I put in
my own data, with a shallower (R_p/R_s)^2, the level of the transmission
spectrum that I retrieve is still the same as the HD209458 level,
(approximately (R_p/R_s)^2=0.015). Here's what I'm doing:

Changing the .tep file to reflect the new target data
Regenerating the atmosphere
Regenerating the opacity file

Otherwise I'm using the same .cfg, kurucz and cs file from the example
and just putting in my data in the cfg file.

Can anyone advise me as to what I'm missing? I have the feeling I must
be missing some extra stage.

Thanks so much for any help at all!
Christina

--

Christina Hedges
PhD Student in Astronomy
Institute of Astronomy, University of Cambridge
ch***@as***
Tel: 01223 766653

[aj-foster]

From: cl***@as*** (clh93)
Date: Thu, 26 Jan 2017 21:21:23 +0000
Subject: [BART-user] Running BA***@di***ransit depths?

Hi again,

I have a small update to the problem I mentioned below. When trying to
edit the BART_transit.cfg file I had updated the surf_rad MCMC initial
values and there was still an offset in the final transmission spectrum.
When I checked this offset is exactly what you would expect if the star
radius was set to the default value in the transit code. (I found a
default value when I dug through the transit manual.)

Is there an additional place beyond the .tep file that I need to add the
stellar radius as a starting condition too?

Thanks again for any help!
Christina

On 2017-01-25 12:28, clh93 wrote:

Hi,

I'm in the process of trying to use BART to test some data I have. I'm
really very impressed with it so far, I'd really like to be able to
use it in my work. I'm able to get the examples to run quite well, but
I'm having a problem putting in my own data.

If I use the HD209458 example everything runs fine. However if I put
in my own data, with a shallower (R_p/R_s)^2, the level of the
transmission spectrum that I retrieve is still the same as the
HD209458 level, (approximately (R_p/R_s)^2=0.015). Here's what I'm
doing:

Changing the .tep file to reflect the new target data
Regenerating the atmosphere
Regenerating the opacity file

Otherwise I'm using the same .cfg, kurucz and cs file from the example
and just putting in my data in the cfg file.

Can anyone advise me as to what I'm missing? I have the feeling I must
be missing some extra stage.

Thanks so much for any help at all!
Christina

--

Christina Hedges
PhD Student in Astronomy
Institute of Astronomy, University of Cambridge
ch***@as***
Tel: 01223 766653

[aj-foster]

From: pc***@fu*** (Patricio Cubillos)
Date: Thu, 26 Jan 2017 22:30:14 +0100
Subject: [BART-user] Running BA***@di***ransit depths?

Hi Christina,
Actually you need to set the stellar radius in the configuration file through the ‘starrad’ argument, this is the stellar radius in units of sun radii.

Sorry, the documentation is not really precise about this issue.
Best,
Patricio.

On Jan 26, 2017, at 10:21 PM, clh93 <cl***@as***> wrote:

Hi again,

I have a small update to the problem I mentioned below. When trying to edit the BART_transit.cfg file I had updated the surf_rad MCMC initial values and there was still an offset in the final transmission spectrum. When I checked this offset is exactly what you would expect if the star radius was set to the default value in the transit code. (I found a default value when I dug through the transit manual.)

Is there an additional place beyond the .tep file that I need to add the stellar radius as a starting condition too?

Thanks again for any help!
Christina

On 2017-01-25 12:28, clh93 wrote:

Hi,
I'm in the process of trying to use BART to test some data I have. I'm
really very impressed with it so far, I'd really like to be able to
use it in my work. I'm able to get the examples to run quite well, but
I'm having a problem putting in my own data.
If I use the HD209458 example everything runs fine. However if I put
in my own data, with a shallower (R_p/R_s)^2, the level of the
transmission spectrum that I retrieve is still the same as the
HD209458 level, (approximately (R_p/R_s)^2=0.015). Here's what I'm
doing:
Changing the .tep file to reflect the new target data
Regenerating the atmosphere
Regenerating the opacity file
Otherwise I'm using the same .cfg, kurucz and cs file from the example
and just putting in my data in the cfg file.
Can anyone advise me as to what I'm missing? I have the feeling I must
be missing some extra stage.
Thanks so much for any help at all!
Christina

--

Christina Hedges
PhD Student in Astronomy
Institute of Astronomy, University of Cambridge
ch***@as***
Tel: 01223 766653

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