PDR code current version – updated 31 May 2020

PDR 1.5.4 is the latest public version of the Meudon PDR code. It was first released in March 2020. This version is the May 2020 version that contains small updates. Many physical processes as well as atomic, molecular and chemical data have been updated. The code is also more robust in many astrophysical conditions. This version of the code comes with the new ISMTools: IDAT and Chemistry Analyser.

 

Citation: If you publish results produced by the Meudon PDR code, we would appreciate if you could mention it in your publications, in order for us to keep track of usage statistics for the code. A typical sentence could be:
PDR models published in this paper have been produced with the Meudon PDR code (Le Petit et al. 2006, http://ism.obspm.fr).

Major changes

All the physics of the previous versions of the PDR code is included in PDR 1.5.4.

Note on surface processes: PDR 1.5.4 includes H2 formation by Langmuir-Hinshelwood and Eley-Rideal mechanisms (Le Bourlot et al. 2012). It does not include the stochastic formalism presented in Bron et al. 2014 and Bron et al. 2016. It includes surface chemistry for other species with rate equation formalism but we do not provide chemical networks including such reactions. This will come later this year. If you need help for surface chemistry or if you would like to use the stochastic formalism, please contact us.

The output files of the Meudon PDR code are now in HDF5 format and should be read with the dedicated tools: IDAT and Chemistry Analyser included in the source code package.

Version Access Note
PDR 1.5.4
ver 2061
(May 2020)
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  • Allow to use Draine’s grain data and non standard metallicity
  • Optimization of HDF5 files writing
PDR 1.5.4
ver 2048
(March 2020)
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  • New processes and updates of molecular data
  • Line intensities computation of H2_18O
  • Implementation of different prescriptions for H2 collisional dissociations
  • New default H2 collisional dissociation: Glover & Mac Low 2007)
  • Update some UV cross sections ( Heays et al. 2017)
  • Update photo-reaction rates ( Heays et al. 2017)
  • Update oxygen collision rates ( Lique et al. 2018 )
  • Update H2O collision rates ( Daniel et al. 2015 )
  • Formation of SH+ using H2 internal energy ( Zanchet et al. 2019)
  • 18O fractionation reactions following Loison et al. (2019)
  • The isotopologues chemistry has been globally expanded
  • Many other updates in the chemical networks and reaction rates following literature and KIDA database
  • Update of many molecular data
  • Better compatibility of the PDR code with DustEM
  • Improvement of robustness and computing time
  • Re-design of thermal balance and charge conservation to improve the robustness of the code
  • Reduction of the global computation time
  • Change in some filenames for windows OS compatibility
  • Switch from python 2.7 to python 3.6
  • Improvement of output files and analysis tools
  • Compatibility of HDF5 output files with IDAT, the new tool to extract and plot computed quantities
  • Clarifications of definitions of quantities associated to line profiles
  • Switch from python 2.7 to python 3.6 for the analysis tools
  • The extractor tool is replaced by IDAT and and is not maintained anymore

Archives

These versions of the PDR code are not maintained anymore. The current PDR code version includes all the physics of these old versions.

Version Access Major updates
PDR 1.5.2
rev 1787
(June 2017)
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  • Improvement of the computing time and stability
  • Radiative transfer includes absorption in the continuum by several gas species
  • A PAH component can be added to the grain distribution
  • Can be run synchronously with DustEM 4.0
  • New cooling processes have been added for hot gas
  • UV pumping and chemical excitation of CO can be considered
  • Better integration of the CMB in the radiative pumping
  • OH + photon produces electronic excited O
  • Update of several hundred chemical rection rates
  • New formation rate of CH+ from C+ + excited H2
  • Default chemical network includes 13C and 18O chemistry (and minimal D chemistry)
  • Chemistry and emission of doubly ionized species added
  • Line intensity computations for H3+, OH+, SH+, CH+ added
  • Update of radiative and dielectronic recombination rates
  • Update of many atomic and molecular data
  • Update of Analysis tools (June 2017)
PDRLight 1.0
rev 1829
(June 2017)
Download PDRLight includes all upgrades of PDR 1.5.2 with the following restrictions:

  • No continuous absorption by gas species
  • Constant dust properties throughout the cloud (allowing analytical integration of some equations)
  • No coupling with DustEM
  • Update of Analysis tools (June 2017)

PDRLight runs require about 10 minutes on a standard laptop. It can be used for demo or teaching sessions.

PDR 1.5.2
rev 1787
(Jan. 2017)
Download
  • Improvement of the computing time and stability
  • Radiative transfer includes absorption in the continuum by several gas species
  • A PAH component can be added to the grain distribution
  • Can be run synchronously with DustEM 4.0
  • New cooling processes have been added for hot gas
  • UV pumping and chemical excitation of CO can be considered
  • Better integration of the CMB in the radiative pumping
  • OH + photon produces electronic excited O
  • Update of several hundred chemical rection rates
  • New formation rate of CH+ from C+ + excited H2
  • Default chemical network includes 13C and 18O chemistry (and minimal D chemistry)
  • Chemistry and emission of doubly ionized species added
  • Line intensity computations for H3+, OH+, SH+, CH+ added
  • Update of radiative and dielectronic recombination rates
  • Update of many atomic and molecular data
PDRLight 1.0
rev 1786
(Jan. 2017)
Download PDRLight includes all upgrades of PDR 1.5.2 with the following restrictions:

  • No continuous absorption by gas species
  • Constant dust properties throughout the cloud (allowing analytical integration of some equations)
  • No coupling with DustEM

PDRLight runs require about 10 minutes on a standard laptop. It can be used for demo or teaching sessions.

1.4.4
(2012)
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  • Include a version of DustEM
  • Improve pumping by external radiation field
  • Langmuir-Hinshelwood and Eley Rideal mechanisms
  • New excitation collision rates for O
  • Computation of O2, OH, and CH+ emission
  • Post-treatment to model a pseudo-spherical cloud
  • Update of chemistry files
1.4.1
(2010)
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  • Improve treatment of grains absorption
1.4
(2009)
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  • Improve radiative transfer in I.R. and sub-millimeter
  • Computation of H2O excitation
  • Graphical interfaces
  • Virtual Observatory integration
5II07
(2007)
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  • Possibility to illuminate the slab on two sides
  • Photo-ionization & dissociation computed with cross sections
23X06
(2006)
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  • Third public version of the PDR code
03II06
(2006)
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  • Second public version of the PDR code
250105
(2005)
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  • First public version of the PDR code