Abstract
ABSTRACT 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 marvel (measured active rotational-vibrational energy levels) analysis is performed for the available spectroscopic data on 27Al16O: 22 473 validated transitions are used to determine 6485 distinct energy levels. These empirical energy levels are used to provide an improved, spectroscopically accurate version of the ExoMol ATP line list for 27Al16O; at the same time, the accuracy of the line lists for the isotopically substituted species 26Al16O, 27Al17O, and 27Al18O is improved by correcting levels in line with the corrections used for 27Al16O. These line lists are available from the ExoMol data base at www.exomol.com.
Highlights
Aluminium monoxide (27Al16O) 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
The energy levels for the three other isotopologues covered in the ATP line list are improved by determining so-called pseudo-experimental energy levels using the technique of Polyansky et al (2017)
In this paper we have attempted to compile all appropriate, published experimental data pertaining to AlO into a single, high-resolution database and comes as part of the continued effort by the ExoMol project to produce new and update existing line lists to this standard (Tennyson et al 2020)
Summary
Aluminium monoxide (27Al16O) 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. Patrascu et al (2015) provided AlO line lists covering the four main isotopologues of aluminium monoxide (27Al16O, 26Al16O, 27Al17O, 27Al18O) as part of the ExoMol project (Tennyson & Yurchenko 2012) This line list, hereafter referred to as the ATP line list (from the initials of the paper’s first author), was based on potential energy and dipole moment curves provided by ab initio electronic structure calculations (Patrascu et al 2014) and variational nuclear motion calculations provided by the newly developed code (Yurchenko et al 2016).
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