Grimm, Simon L; Malik, Matej; Kitzmann, Daniel; Guzmán-Mesa, Andrea; Hoeijmakers, H. Jens; Fisher, Chloe; Mendonça, João M.; Yurchenko, Sergey N.; Tennyson, Jonathan; Alesina, Fabien; Buchschacher, Nicolas; Burnier, Julien; Segransan, Damien; Kurucz, Robert L.; Heng, Kevin (2021). HELIOS-K 2.0 Opacity Calculator and Open-source Opacity Database for Exoplanetary Atmospheres. Astrophysical journal - supplement series, 253(1), p. 30. Institute of Physics Publishing IOP 10.3847/1538-4365/abd773
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Computing and using opacities is a key part of modeling and interpreting data of exoplanetary atmospheres. Since the underlying spectroscopic line lists are constantly expanding and currently include up to ∼1010–1011 transition lines, the opacity calculator codes need to become more powerful. Here we present major upgrades to the HELIOS-K GPU-accelerated opacity calculator and describe the necessary steps to process large line lists within a reasonable amount of time. Besides performance improvements, we include more capabilities and present a toolbox for handling different atomic and molecular data sets, from downloading and preprocessing the data to performing the opacity calculations in a user-friendly way. HELIOS-K supports line lists from ExoMol, HITRAN, HITEMP, NIST, Kurucz, and VALD3. By matching the resolution of 0.1 cm−1 and cutting length of 25 cm−1 used by the ExoCross code for timing performance (251 s excluding data read-in time), HELIOS-K can process the ExoMol BT2 water line list in 12.5 s. Using a resolution of 0.01 cm−1, it takes 45 s, equivalent to about 107 lines s−1. As a wavenumber resolution of 0.01 cm−1 suffices for most exoplanetary atmosphere spectroscopic calculations, we adopt this resolution in calculating opacity functions for several hundred atomic and molecular species and make them freely available on the open-access DACE database. For the opacity calculations of the database, we use a cutting length of 100 cm−1 for molecules and no cutting length for atoms. Our opacities are available for downloading from https://dace.unige.ch/opacityDatabase and may be visualized using https://dace.unige.ch/opacity.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
10 Strategic Research Centers > Center for Space and Habitability (CSH) 13 Central Units > Administrative Director's Office > IT Section 08 Faculty of Science > Physics Institute 08 Faculty of Science > Physics Institute > NCCR PlanetS |
UniBE Contributor: |
Grimm, Simon Lukas, Kitzmann, Daniel, Fisher, Chloe Elizabeth, Heng, Kevin |
Subjects: |
500 Science > 520 Astronomy 500 Science > 530 Physics 600 Technology > 610 Medicine & health 300 Social sciences, sociology & anthropology > 360 Social problems & social services |
ISSN: |
0067-0049 |
Publisher: |
Institute of Physics Publishing IOP |
Language: |
English |
Submitter: |
Danielle Zemp |
Date Deposited: |
18 May 2022 09:24 |
Last Modified: |
05 Dec 2022 16:19 |
Publisher DOI: |
10.3847/1538-4365/abd773 |
BORIS DOI: |
10.48350/169730 |
URI: |
https://boris.unibe.ch/id/eprint/169730 |
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