The Maser-emitting Structure and Time Variability of the SiS Lines J = 14-13 and 15-14 in IRC+10216

We present new high angular resolution interferometer observations of the v = 0 J = 14-13 and 15-14 SiS lines toward IRC+10216, carried out with the Combined Array for Research in Millimeter-wave Astronomy and the Atacama Large Millimeter Array. The maps, with angular resolutions of ≃0.″25 and 0.″55, reveal (1) an extended, roughly uniform, and weak emission with a size of ≃0.″5; (2) a component elongated approximately along the east-west direction peaking at ≃0.″13 and 0.″17 at both sides of the central star; and (3) two blue- and redshifted compact components peaking around 0.″07 to the NW of the star. We have modeled the emission with a 3D radiation transfer code, finding that the observations cannot be explained only by thermal emission. Several maser clumps and one arc-shaped maser feature arranged from 5 to 20 from the central star, in addition to a thin shell-like maser structure at ≃13 , are required to explain the observations. This maser-emitting set of structures accounts for 75% of the total emission, while the other 25% is produced by thermally excited molecules. About 60% of the maser emission comes from the extended emission, and the rest comes from the set of clumps and the arc. The analysis of a time monitoring of these and other SiS and 29SiS lines carried out with the IRAM 30 m telescope from 2015 to present suggests that the intensity of some spectral components of the maser emission strongly depends on the stellar pulsation, while other components show a mild variability. This monitoring evidences a significant phase lag of ≃0.2 between the maser and near-IR light curves.Fil: Fonfra, J. P.. Consejo Superior de Investigaciones Científicas; EspañaFil: Fernandez Lopez, Manuel. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Pardo, J. R.. Consejo Superior de Investigaciones Científicas; EspañaFil: Agúndez, M.. Consejo Superior de Investigaciones Científicas; EspañaFil: Sánchez Contreras, C.. Consejo Superior de Investigaciones Científicas; EspañaFil: Velilla Prieto, L.. Consejo Superior de Investigaciones Científicas; EspañaFil: Cernicharo, J.. Consejo Superior de Investigaciones Científicas; EspañaFil: Santander García, M.. Observatorio Astronomico Nacional; EspañaFil: Quintana Lacaci, G.. Consejo Superior de Investigaciones Científicas; EspañaFil: Castro Carrizo, A.. Institut de Radioastronomie Millimétrique; FranciaFil: Curiel, S.. Universidad Nacional Autónoma de México; Méxic