[Mesa-users] information on stella/mesa.swd.ph

Mon May 6 01:12:15 UTC 2024

Please CC MESA users on your replies to the mailing list.

STELLA finds the photosphere by calculating the location where optical
depth tau = 2/3 using the Rosseland mean opacity (grey = over all frequency
groups). The "photospheric velocity" reported in mesa.swd.ph is the fluid
velocity at that location in the ejecta.

Additionally, there is a method for finding the velocity as probed by the
Fe II 5169 Angstrom line using the Sobolev optical depth, described in MESA
IV <https://ui.adsabs.harvard.edu/abs/2018ApJS..234...34P/abstract>.

In both cases, I advise making note of discussions in Kasen and Woosley 2009
<https://ui.adsabs.harvard.edu/abs/2009ApJ...703.2205K/abstract> and Goldberg
et al 2019 <https://ui.adsabs.harvard.edu/abs/2019ApJ...879....3G/abstract>
regarding
making use of this quantity in combination with lightcurve information.

Best,
~Jared

On Sun, May 5, 2024 at 12:38 AM 游凱安 <timyu930218 at gmail.com> wrote:

> thanks for reply~
>
> How stella determine and obtain Vph? Since Vph will be affected by the
> position of the photosphere, I want to ensure where stella determines Vph.
>
> Sincerely,
>
> Kau-An
>
> Jared Goldberg <jgoldberg at flatironinstitute.org> 於 2024年5月5日 週日 上午3:26寫道：
>
>> The second column is labelled "t post max lbol" -- this is the time after
>> the peak bolometric luminosity.
>>
>> ~Jared
>>
>> On Sat, May 4, 2024 at 1:31 PM 游凱安 via Mesa-users <
>> mesa-users at lists.mesastar.org> wrote:
>>
>>> Thanks for helping~
>>>
>>> however, how can I know vph at the specific time after the explosion
>>> since this profile doesn't have time index.
>>>
>>> or I need to refer some data to get time index?
>>>
>>> I want to find vph at the middle of plateau.
>>>
>>> Sincerely,
>>> Kai-An
>>>
>>> [image: 截圖 2024-05-05 凌晨1.26.21.png]
>>>
>>> Jared Goldberg <jgoldberg at flatironinstitute.org> 於 2024年4月16日 週二
>>> 上午5:56寫道：
>>>
>>>> Make sure your $MESA_DIR, $MESASDK_ROOT, and version of STELLA are all
>>>> consistent.
>>>>
>>>> In newer revisions of MESA you can also comment out the MESA_DIR =
>>>> ..... line in stella/res/makefile. Then it will default to using your
>>>> existing $MESA_DIR.
>>>>
>>>> In stella_extras.f90. there is a line "my_mesa_dir = ../../.. "  (line
>>>> 46 in my version but it may be modified) -- you will want to set that to
>>>> match your $MESA_DIR as well.
>>>>
>>>> ~Jared
>>>>
>>>> On Mon, Apr 15, 2024 at 1:19 PM 游凱安 via Mesa-users <
>>>> mesa-users at lists.mesastar.org> wrote:
>>>>
>>>>> [image: 截圖 2024-04-16 凌晨1.18.12.png]
>>>>>
>>>>> 游凱安 <timyu930218 at gmail.com> 於 2024年4月16日 週二 上午1:17寫道：
>>>>>
>>>>>> sorry, I've modified makefile in res again.
>>>>>>
>>>>>> but it still cannot work.
>>>>>>
>>>>>> should I modify the run script or something else in MESA/utils?
>>>>>>
>>>>>> tks
>>>>>>
>>>>>> Jared Goldberg <jgoldberg at flatironinstitute.org> 於 2024年4月15日 週一
>>>>>> 上午11:07寫道：
>>>>>>
>>>>>>> Your $MESA_DIR should be set to the directory for your MESA
>>>>>>> installation, not ..stella/res/
>>>>>>> Cheers,
>>>>>>> ~Jared
>>>>>>>
>>>>>>>
>>>>>>> On Apr 14, 2024, at 9:51 PM, 游凱安 via Mesa-users <
>>>>>>> mesa-users at lists.mesastar.org> wrote:
>>>>>>>
>>>>>>> 
>>>>>>> <截圖 2024-04-15 上午9.41.14.png>
>>>>>>>
>>>>>>>
>>>>>>> Yes, I want to find velocity in the photosphere.
>>>>>>> I have checked res directory, and there is no mesa.swd.ph file
>>>>>>> which is different from the test directory.
>>>>>>> <截圖 2024-04-15 上午9.44.57.png>
>>>>>>> the makefile is in the res directory
>>>>>>> but after the stop of running in stella, it always says
>>>>>>> makefile:7: ..stella/res/makefile_header: No such file or directory.
>>>>>>>
>>>>>>> so, how should I modify the route so that it will produce
>>>>>>> mesa.swd.ph?
>>>>>>>
>>>>>>> Sincerely,
>>>>>>> Kai-an
>>>>>>>
>>>>>>> Jared Goldberg <jgoldberg at flatironinstitute.org> 於 2024年4月15日 週一
>>>>>>> 上午1:51寫道：
>>>>>>>
>>>>>>>> Dear Kai-an,
>>>>>>>>
>>>>>>>> What do you mean by v_phm ? Do you mean the velocity at the
>>>>>>>> photosphere? This is included in mesa.swd.ph. Or do you mean a
>>>>>>>> synthetic estimated velocity probed by the Fe II 5169A line, which is
>>>>>>>> contained in mesa.vel_feII .
>>>>>>>>
>>>>>>>> After the stop of the normal STELLA run, there is a script
>>>>>>>> res/stella_extras.f90 which compiles some useful output, including
>>>>>>>> generating the mesa.swd.ph file, from other files (including
>>>>>>>> mesa.swd and mesa.ph, which are different files). You can see the
>>>>>>>> stella/README for more details, and the code used to generate
>>>>>>>> mesa.swd.ph is in res/stella_extras.f90
>>>>>>>>
>>>>>>>> Best,
>>>>>>>> ~Jared
>>>>>>>>
>>>>>>>> On Sun, Apr 14, 2024 at 2:58 AM 游凱安 via Mesa-users <
>>>>>>>> mesa-users at lists.mesastar.org> wrote:
>>>>>>>>
>>>>>>>>> Dear all,
>>>>>>>>>
>>>>>>>>> I have looked up for some information,
>>>>>>>>>
>>>>>>>>> but it seems that both mesa.swd and mesa.ph are independent
>>>>>>>>>
>>>>>>>>> I want to clarify the meaning of each data item in the file since
>>>>>>>>> I want to obtain v_phm.
>>>>>>>>>
>>>>>>>>> the leftmost is the day with frequency bins?
>>>>>>>>>
>>>>>>>>> and what unit of v_phm is in the file.
>>>>>>>>>
>>>>>>>>> thank you.
>>>>>>>>>
>>>>>>>>> Sincerely,
>>>>>>>>>
>>>>>>>>> Kai-an
>>>>>>>>>
>>>>>>>>> <截圖 2024-04-14 下午2.55.03.png>
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> mesa-users at lists.mesastar.org
>>>>>>>>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>> mesa-users at lists.mesastar.org
>>>>>>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>>>>>>
>>>>>>> _______________________________________________
>>>>> mesa-users at lists.mesastar.org
>>>>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>>>>
>>>>> _______________________________________________
>>> mesa-users at lists.mesastar.org
>>> https://lists.mesastar.org/mailman/listinfo/mesa-users
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>>>
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