The general applicability of self-similar solutions for thermal disc winds

ABSTRACT Thermal disc winds occur in many contexts and may be particularly important to the secular evolution dispersal of protoplanetary discs heated by high energy radiation from their central star. In this paper, we generalize previous models self-similar thermal – which have self-consistent morphology variation flow variables case launch an elevated base non-isothermal conditions. These solutions are well-reproduced hydrodynamic simulations, which, as isothermal launched midplane, find at maximum Mach number for streamline extend infinity without encountering a singularity. We explain behaviour based on fact that lower do not fill spatial domain. also show simulations reflect corresponding across range conditions appropriate photoevaporating discs, even when gravity, centrifugal forces, or changes density gradient mean problem is inherently scale free. Of all parameters varied, elevation wind affected velocity most strongly, with temperature gradients causing only minor differences. explore how launching affects Ne ii line profiles winds, finding it increases (reduces) full width half (FWHM) low (high) inclination sight compared midplane thus weakens dependence FWHM inclination.