Exploring wind-driving dust species in cool luminous giants I. Basic criteria and dynamical models of M-type AGB stars

TL;DR

This study uses detailed radiation-hydrodynamical models to identify dust species capable of driving winds in cool luminous M-type AGB stars, highlighting Mg2SiO4 as a promising candidate due to its optical properties and scattering effects.

Contribution

The paper introduces a systematic modeling approach to evaluate dust species as wind drivers in AGB stars, emphasizing the role of optical and chemical properties in wind initiation.

Findings

Mg2SiO4 with 0.1-1 micron grains is a strong candidate for wind-driving.

Metallic iron and Fe-bearing silicates are unlikely to drive winds due to their optical properties.

TiO2 and other species are less certain due to data uncertainties.

Abstract

This work is part of an ongoing effort aiming at identifying the actual wind-drivers among the dust species observed in circumstellar envelopes. In particular, we focus on the interplay between a strong stellar radiation field and the dust formation process. To identify critical properties of potential wind-driving dust species we use detailed radiation-hydrodynamical models which include a parameterized dust description, complemented by simple analytical estimates to help with the physical interpretation of the numerical results. The adopted dust description is constructed to mimic different chemical and optical dust properties in order to systematically study the effects of a realistic radiation field on the second stage of the mass loss mechanism. We see distinct trends in which combinations of optical and chemical dust properties are needed to trigger an outflow. Dust species with a low condensation temperature and a NIR absorption coefficient that decreases strongly with wavelength will not condense close enough to the stellar surface to be considered as potential wind-drivers. Our models confirm that metallic iron and Fe-bearing silicates are not viable as wind-drivers due to their near-infrared optical properties and resulting large condensation distances. TiO2 is also excluded as a wind-driver due to the low abundance of Ti. Other species, such a SiO2 and Al2O3, are less clear-cut cases due to uncertainties in the optical and chemical data and further work is needed. A strong candidate is Mg2SiO4 with grain sizes of 0.1-1 micron, where scattering contributes significantly to the radiative acceleration, as suggested by earlier theoretical work and supported by recent observations.