[BART-user] TEA: singleTP vs. multiTP?

[aj-foster]

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

From: ia***@lp*** (Ian Crossfield)
Date: Wed, 09 Sep 2015 10:03:33 -0700
Subject: [BART-user] TEA: singleTP vs. multiTP?

(Please advise if TEA questions should be posted to a separate mailing list)

Two questions about T/P profiles:
In TEA, what is the meaning of singleTP vs. multiTP? At first I thought
these handled one T/P profile vs. somehow handling many profiles at
once, but it is not (yet!) clear from the documentation what two cases
these names refer to.

Also: does TEA (or BART, etc.) compute T/P profiles for a user-specified
atmosphere, or do these only accept pre-computed, tabular T/P profile
files? If the latter, are there any good, free tools available to
compute these?

I'm enjoying the chance to play with all these codes; thanks again for
all your efforts on this.

Regards,
-Ian

--
Dr. Ian Crossfield
NASA Sagan Fellow
http://www.lpl.arizona.edu/~ianc/
U. Arizona, Lunar & Planetary Lab
Kuiper Space Sciences 401
+1 520.626.2083

[aj-foster]

From: ja***@ph*** (Jasmina Blecic)
Date: Wed, 09 Sep 2015 15:29:29 -0400
Subject: [BART-user] TEA: singleTP vs. multiTP?

Hi Ian,

yes, there is a separate mailing list for TEA users
(TE***@ph***), but it is fine to use BART mailing list if
you run TEA within BART. If you want to run it outside of BART, then you
would want to use TEA-user mailing list.

More documentation on TEA can be found here:
https://github.com/dzesmin/TEA/tree/master/doc/

Single T,P is just a single T and P point. So, you would get an
abundances for the species of interest only for the specific temperature
and pressure value (for example T=1500K, p=1bar).

Multi T,P is the list of T,P points, like you would have for an
atmosphere of interest (for example p=(1e-5-1e2) bar, and T=(1000-2000)
K divided in 100 layers in log pressure).

There is a difference if you want to run TEA within BART or on its own.
Let me cover here how is that done in BART. Let me know, if you want to
run it outside of BART.

User defines the temperature and pressure ranges and number of layers in
the BART configuration file.
Take a lo***@th***irst 75 lines in
https://github.com/exosports/BART/blob/master/examples/BART_example.cfg.
We currently use Line's parametrized approach to define the T-P profile,
using his 5 free parameters.

You can play with these parameters (line 52) until you see a T-P profile
that you would like, and only then run BART. T-P profile plot is placed
in the working directory, and the code will not run until you approve
the T-P profile and click return.

BART computes the initial atmospheric model (species mixing fractions)
based on the user-defined temperature and pressure ranges, number of
layers, provided C/O ratio, metallicity factor, etc in two ways:

1. using TEA - producing the thermochemical equilibrium abundances
2. using the vertically-uniform abundances provided on the line 71.
   Setting this line to None, will automatically run TEA.

Either run will produce an initial atmospheric model in the format that
BART can read it.
Remember that BART has 5 free parameters for the T-P profile and as many
free parameters for species factors (constant with altitude) as you
want. Initial model atmosphere is a necessary starting point, as the
best-fit abundances are calculated based on the initial values and the
best-fit species factors.

(you do need to provide a system parameter file in the format of our tep
file, and a kurucz file, see
https://github.com/exosports/BART/tree/master/inputs)

BART can be run just for TEA and you can see the initial atmospheric
model as an ASCII file in the working directory.

Upon configuring BART.cfg file run BART as:
../BART.py --justTEA

Let me know if you need more details.
Warm greetings
Jasmina

On 09/09/2015 01:03 PM, Ian Crossfield wrote:

(Please advise if TEA questions should be posted to a separate mailing
list)

Two questions about T/P profiles:
In TEA, what is the meaning of singleTP vs. multiTP? At first I
thought these handled one T/P profile vs. somehow handling many
pr***@on***, but it is not (yet!) clear from the documentation
what two cases these names refer to.

Also: does TEA (or BART, etc.) compute T/P profiles for a
user-specified atmosphere, or do these only accept pre-computed,
tabular T/P profile files? If the latter, are there any good, free
tools available to compute these?

I'm enjoying the chance to play with all these codes; thanks again for
all your efforts on this.

Regards,
-Ian

[aj-foster]

From: jh***@ph*** (Joe Harrington)
Date: Wed, 09 Sep 2015 18:32:04 -0400
Subject: [BART-user] TEA: singleTP vs. multiTP?

As you receive and answer questions, it would be good either to make
sure they're answered in the docs (in which case, ask what doc the
person was missing and why they didn't see it) or add the question and
answer to a doc, or to a FAQ.

--jh--

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autolearn=unavailable autolearn_force=no version=3.4.0
Date: Wed, 09 Sep 2015 15:29:29 -0400
From: Jasmina Blecic <ja***@ph***>
To: Ian Crossfield <ia***@lp***>, BA***@ph***
In-Reply-To: <55***@lp***>
Subject: Re: [BART-user] TEA: singleTP vs. multiTP?
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Hi Ian,

yes, there is a separate mailing list for TEA users
(TE***@ph***), but it is fine to use BART mailing list if
you run TEA within BART. If you want to run it outside of BART, then you
would want to use TEA-user mailing list.

More documentation on TEA can be found here:
https://github.com/dzesmin/TEA/tree/master/doc/

Single T,P is just a single T and P point. So, you would get an
abundances for the species of interest only for the specific temperature
and pressure value (for example T=1500K, p=1bar).

Multi T,P is the list of T,P points, like you would have for an
atmosphere of interest (for example p=(1e-5-1e2) bar, and T=(1000-2000)
K divided in 100 layers in log pressure).

There is a difference if you want to run TEA within BART or on its own.
Let me cover here how is that done in BART. Let me know, if you want to
run it outside of BART.

User defines the temperature and pressure ranges and number of layers in
the BART configuration file.
Take a lo***@th***irst 75 lines in
https://github.com/exosports/BART/blob/master/examples/BART_example.cfg.
We currently use Line's parametrized approach to define the T-P profile,
using his 5 free parameters.

You can play with these parameters (line 52) until you see a T-P profile
that you would like, and only then run BART. T-P profile plot is placed
in the working directory, and the code will not run until you approve
the T-P profile and click return.

BART computes the initial atmospheric model (species mixing fractions)
based on the user-defined temperature and pressure ranges, number of
layers, provided C/O ratio, metallicity factor, etc in two ways:

1. using TEA - producing the thermochemical equilibrium abundances
2. using the vertically-uniform abundances provided on the line 71.
   Setting this line to None, will automatically run TEA.

Either run will produce an initial atmospheric model in the format that
BART can read it.
Remember that BART has 5 free parameters for the T-P profile and as many
free parameters for species factors (constant with altitude) as you
want. Initial model atmosphere is a necessary starting point, as the
best-fit abundances are calculated based on the initial values and the
best-fit species factors.

(you do need to provide a system parameter file in the format of our tep
file, and a kurucz file, see
https://github.com/exosports/BART/tree/master/inputs)

BART can be run just for TEA and you can see the initial atmospheric
model as an ASCII file in the working directory.

Upon configuring BART.cfg file run BART as:
../BART.py --justTEA

Let me know if you need more details.
Warm greetings
Jasmina

On 09/09/2015 01:03 PM, Ian Crossfield wrote:

(Please advise if TEA questions should be posted to a separate mailing
list)

Two questions about T/P profiles:
In TEA, what is the meaning of singleTP vs. multiTP? At first I
thought these handled one T/P profile vs. somehow handling many
pr***@on***, but it is not (yet!) clear from the documentation
what two cases these names refer to.

Also: does TEA (or BART, etc.) compute T/P profiles for a
user-specified atmosphere, or do these only accept pre-computed,
tabular T/P profile files? If the latter, are there any good, free
tools available to compute these?

I'm enjoying the chance to play with all these codes; thanks again for
all your efforts on this.

Regards,
-Ian

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