Special Issue "Atomic and Molecular Opacity Data for Astrophysics"
A special issue of Atoms (ISSN 2218-2004).
Deadline for manuscript submissions: 31 March 2018
Dr. Jean-Christophe Pain
Commissariat à l’Energie Atomique (CEA), DAM, DIF, F-91297 Arpajon, France
Interests: helio- and asteroseismology; stellar spectra; multicharged-ion plasmas; local and non-local thermodynamic equilibrium plasmas; radiative opacity; atomic processes in stellar interiors and envelopes; photo-ionization; photo-excitation; inverse Bremsstrahlung; databases; radiative transfer; radiative acceleration; molecular opacity
The revision of the standard Los Alamos opacities thirty years ago by the Lawrence Livermore National Laboratory (OPAL) and the Opacity Project (OP) teams was an early example of collaborative big-data science, yielding reliable computed quantities (spectral and mean opacities, radiative accelerations) that were widely used to investigate many astrophysical topics. The precision of the calculated opacities is a key point of comparisons between theory, laboratory (laser or Z-pinch) plasma spectroscopy experiments, and stellar observations in different frameworks: Standard Solar Model (SSM); helio- and astero-seismology (for instance of Beta Cephei-type pulsating stars); non-local thermodynamic-equilibrium 3D hydrodynamic photospheric modeling; nuclear reaction rates, solar neutrino detections, etc. In this context, the recent revision of the solar photospheric metal abundances in 2005 spoiled the agreement between the helioseismic indicators (depth of the convection zone, sound-speed profile, and helium surface abundance) and the SSM predictions, agreement that could be recovered with a substantial opacity increase.
Spectroscopic observations of brown dwarfs and extrasolar giant planets (hot Jupiter stars and super-Earths) in the infrared to the ultraviolet ranges are now possible. The model atmospheres can be tested for atmospheric temperatures (100–3000 K) and pressures (10-6–100 atm) at which many molecules reside. Molecular opacities (accounting for rotational-vibrational and electronic bound-free, bound-bound, free-free, and collision-induced transitions) for alkali metals, iron, heavy metal oxides, metal hydrides, H2, CO, H2O, N2, CH4, NH3, CO2, HCN, H2S, PH3, etc., needed to simulate astronomical observations, can be obtained from laboratory measurements or ab initio calculations.
This Special Issue of Atoms will highlight the need for continuing research on the atomic and molecular opacity data for astrophysics. It will present recent theoretical and experimental works, as well as investigations in astrophysics where opacities have been used as a tool to investigate physical properties of celestial objects.
Dr. Jean-Christophe Pain
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Atoms is an international peer-reviewed open access quarterly journal published by MDPI.
Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 350 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.
- stellar spectra
- Active-Galactic-Nuclei spectra
- interstellar spectra
- pulsating stars
- beta Cephei
- Standard Solar Model
- extragalactic objects
- laboratory plasma
- atomic and molecular opacity