Identification of beryllium hydride isotopomer lines in sunspot umbral spectra

Shanmugavel, R.; Bagare, S. P.; Rajamanickam, N.; Kumar, K. Balachandra

doi:10.2298/saj0876051s

Cited by 11 publications

(7 citation statements)

References 11 publications

(10 reference statements)

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“…BeH: Darby-Lewis et al [138] have recently developed a new model for beryllium monohydride, which both improves (marginally) on the earlier Yadin line list [51] and, more significantly, includes a treatment of the A 2 Π-X 2 Σ + band. This band has been observed in sunspot [139], but the motivation for extending the line list was actually fusion plasmas where the use of Be walls has led to the observation of A-X emissions in the plasma [140]. Darby-Lewis et al demonstrate that their new line list gives excellent reproduction of emission spectra of both BeH and BeD, as well as predictions for the spectrum of BeT, which is important for fusion studies.…”

Section: Hcn: the Line List Shown Inmentioning

confidence: 99%

The ExoMol Atlas of Molecular Opacities

Tennyson

Yurchenko

2018

Atoms

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Abstract:The ExoMol project is dedicated to providing molecular line lists for exoplanet and other hot atmospheres. The ExoMol procedure uses a mixture of ab initio calculations and available laboratory data. The actual line lists are generated using variational nuclear motion calculations. These line lists form the input for opacity models for cool stars and brown dwarfs as well as for radiative transport models involving exoplanets. This paper is a collection of molecular opacities for 52 molecules (130 isotopologues) at two reference temperatures, 300 K and 2000 K, using line lists from the ExoMol database. So far, ExoMol line lists have been generated for about 30 key molecular species. Other line lists are taken from external sources or from our work predating the ExoMol project. An overview of the line lists generated by ExoMol thus far is presented and used to evaluate further molecular data needs. Other line lists are also considered. The requirement for completeness within a line list is emphasized and needs for further line lists discussed.

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Section: Hcn: the Line List Shown Inmentioning

confidence: 99%

The ExoMol Atlas of Molecular Opacities

Tennyson

Yurchenko

2018

Atoms

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“…A number of diatomic molecules for which ExoMol provides extensive hot line lists have been detected in sunspots. These include SiO [50] , SiH [51] , SH [52] , BeH [53] , VO [54] , as well as MgH, MgO, TiO, C 2 and CaH which have all long been observed in sunspots [55] . In addition the spectrum of water is well-known in sunspots [56][57][58][59][60] ; studies of water spectra in sunspots should be aided by the new POKAZATEL water line list [61] which is designed for studies at temperatures above 30 0 0 K such as those encountered in solar umbra and penumbra.…”

Section: Introductionmentioning

confidence: 99%

The 2020 release of the ExoMol database: Molecular line lists for exoplanet and other hot atmospheres

Tennyson

Yurchenko

Al-Refaie

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

193

161

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The ExoMol database ( www.exomol.com ) provides molecular data for spectroscopic studies of hot atmospheres. While the data are intended for studies of exoplanets and other astronomical bodies, the dataset is widely applicable. The basic form of the database is extensive line lists; these are supplemented with partition functions, state lifetimes, cooling functions, Landé g-factors, temperature-dependent cross sections, opacities, pressure broadening parameters, k -coefficients and dipoles. This paper presents the latest release of the database which has been expanded to consider 80 molecules and 190 isotopologues totaling over 700 billion transitions. While the spectroscopic data are concentrated at infrared and visible wavelengths, ultraviolet transitions are being increasingly considered in response to requests from observers. The core of the database comes from the ExoMol project which primarily uses theoretical methods, albeit usually fine-tuned to reproduce laboratory spectra, to generate very extensive line lists for studies of hot bodies. The data have recently been supplemented by line lists derived from direct laboratory observations, albeit usually with the use of ab initio transition intensities. A major push in the new release is towards accurate characterisation of transition frequencies for use in high resolution studies of exoplanets and other bodies.

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“…BeH is one of the simplest heteronuclear diatomic molecules, and hence it is a strong contender for being observed in contexts such as exoplanetary atmospheres, cool stars and the interstellar medium. However, there are only very few astrophysical records of BeH, for example, a detection of A 2 Σ + → X 2 Σ + emission lines of BeH in the sunspot umbra spectra by Wöhl () and Shanmugavel et al ().…”

Section: Introductionmentioning

confidence: 99%

ExoMol line lists - I. The rovibrational spectrum of BeH, MgH and CaH in theX ²Σ⁺state

Yadin¹,

Veness²,

Conti³

et al. 2012

Monthly Notices of the Royal Astronomical Society

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Accurate line lists for three molecules, BeH, MgH and CaH, in their ground electronic states are presented. These line lists are suitable for temperatures relevant to exoplanetary atmospheres and cool stars (up to 2000 K). A combination of empirical and ab initio methods is used. The rovibrational energy levels of BeH, MgH and CaH are computed using the programs level and dpotfit in conjunction with ‘spectroscopic’ potential energy curves (PECs). The PEC of BeH is taken from the literature, while the PECs of CaH and MgH are generated by fitting to the experimental transition energy levels. Both spin‐rotation interactions (except for BeH, for which it is negligible) and non‐adiabatic corrections are explicitly taken into account. Accurate line intensities are generated using newly computed ab initio dipole moment curves for each molecule using high levels of theory. Full line lists of rotation–vibration transitions for 9BeH, 24MgH, 25MgH, 26MgH and 40CaH are made available in an electronic form as supporting information to this paper and at http://www.exomol.com.

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Identification of beryllium hydride isotopomer lines in sunspot umbral spectra

Cited by 11 publications

References 11 publications

The ExoMol Atlas of Molecular Opacities

The ExoMol Atlas of Molecular Opacities

The 2020 release of the ExoMol database: Molecular line lists for exoplanet and other hot atmospheres

ExoMol line lists - I. The rovibrational spectrum of BeH, MgH and CaH in theX ²Σ⁺state

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Identification of beryllium hydride isotopomer lines in sunspot umbral spectra

Cited by 11 publications

References 11 publications

The ExoMol Atlas of Molecular Opacities

The ExoMol Atlas of Molecular Opacities

The 2020 release of the ExoMol database: Molecular line lists for exoplanet and other hot atmospheres

ExoMol line lists - I. The rovibrational spectrum of BeH, MgH and CaH in theX 2Σ+state

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ExoMol line lists - I. The rovibrational spectrum of BeH, MgH and CaH in theX ²Σ⁺state