Occurrence of AlO Molecular Lines in Sunspot Umbral Spectra

Sriramachandran, P.; Viswanathan, Balakrishnan; Shanmugavel, R.

doi:10.1007/s11207-013-0264-1

Cited by 20 publications

(4 citation statements)

References 21 publications

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“…Aluminium monoxide is chosen not only because it is an important astronomical species having been observed in sunspots (Sriramachandran et al 2013) and a variety of other stars (Kaminski et al 2013, Banerjee et al 2004, Banerjee et al 2012) but also for terrestrial applications were emissions arise from rocket exhausts (Knecht et al 1996) and plasmas (Surmick & Parigger 2014). Furthermore there are direct experimental measurements of radiative lifetimes for vibrational levels in the B 2 Σ + state (Johnson et al 1972, Dagdigian et al 1975).…”

Section: Alomentioning

confidence: 99%

Radiative lifetimes and cooling functions for astrophysically important molecules

Tennyson

Hulme

Naim

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

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Extensive line lists generated as part of the ExoMol project are used to compute lifetimes for individual rotational, rovibrational and rovibronic excited states, and temperature-dependent cooling functions by summing over all dipole-allowed transitions for the states concerned. Results are presented for SiO, CaH, AlO, ScH, H 2 O and methane. The results for CH 4 are particularly unusual with 4 excited states with no dipole-allowed decay route and several others where these decays lead to exceptionally long lifetimes. These lifetime data should be useful in models of masers and estimates of critical densities, and can provide a link with laboratory measurements. Cooling functions are important in stellar and planet formation.

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Section: Alomentioning

confidence: 99%

Radiative lifetimes and cooling functions for astrophysically important molecules

Tennyson

Hulme

Naim

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

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“…Aluminium monoxide ( 27 Al 16 O) is a well-known species in cool (Kaminski et al 2013) and variable (Banerjee et al 2003;Tylenda et al 2005;Banerjee et al 2012;Kaminski et al 2016) stars through its electronic spectrum. It has also been observed in Sunspots (Sriramachandran et al 2013) as well as the winds from oxygen-rich AGB stars (De Beck et al 2017;Danilovich et al 2020) and stellar envelopes (Tenenbaum & Ziurys 2009). The radioactive isotope 26 Al has a half-life of 70 000 years so observations of 26 Al 16 O have the potential to give timing information but have so far only provided upper limits (Banerjee et al 2004).…”

Section: Introductionmentioning

confidence: 99%

A high-resolution line list for AlO

Bowesman,

Shuai,

Yurchenko

et al. 2021

Preprint

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Indications of aluminium monoxide in atmospheres of exoplanets are being reported. Studies using high-resolution spectroscopy should allow a strong detection but require high accuracy laboratory data. A (measured active rotational-vibrational energy levels) analysis is performed for the available spectroscopic data on 27 Al 16 O: 22 473 validated transitions are used to determine 6 485 distinct energy levels. These empirical energy levels are used to provide an improved, spectroscopically accurate version of the ExoMol ATP line list for 27 Al 16 O; at the same time the accuracy of the line lists for the isotopically-substituted species 26 Al 16 O, 27 Al 17 O and 27 Al 18 O are improved by correcting levels in line with the corrections used for 27 Al 16 O. These line lists are available from the ExoMol database at www.exomol.com.

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“…Transitions in the blue-green B -X system have been observed in sunspots (Sriramachandran et al 2013) and the red supergiant VY Canis Majoris (Kaminski et al 2013), in which millimeter-wave rotational transitions have also been observed (Tenenbaum & Ziurys 2009). Finally, AlO spectra have been used to try and determine abundance of the longlived, radioactive 26 Al isotope (Banerjee et al 2004).…”

Section: Introductionmentioning

confidence: 99%

ExoMol molecular line lists – IX. The spectrum of AlO

Patrascu¹,

Yurchenko²,

Tennyson³

2015

Monthly Notices of the Royal Astronomical Society

109

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Accurate line lists are calculated for aluminium monoxide covering the pure rotation, rotation-vibration and electronic (B -X blue-green and A -X infrared bands) spectrum. Line lists are presented for the main isotopologue, 27 Al 16 O, as well as for 27 Al 17 O, 27 Al 18 O and 26 Al 16 O. These line lists are suitable for high temperatures (up to 8000 K) including those relevant to exoplanetary atmospheres and cool stars. A combination of empirical and ab initio methods is used: the potential energy curves were previously determined to high accuracy by fitting to extensive data from analysis of laboratory spectra; a high quality ab initio dipole moment curve is calculated using quadruple zeta basis set and the multi-reference configuration interaction (MRCI) method. Partition functions plus full line lists of transitions are made available in an electronic form as supplementary data to this article and at www.exomol.com.

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Occurrence of AlO Molecular Lines in Sunspot Umbral Spectra

Cited by 20 publications

References 21 publications

Radiative lifetimes and cooling functions for astrophysically important molecules

Radiative lifetimes and cooling functions for astrophysically important molecules

A high-resolution line list for AlO

ExoMol molecular line lists – IX. The spectrum of AlO

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