Cooling in the shade of warped transition discs

Casassus, Simon; Pérez, Sebastián; Osses, Axel; Marino, Sebastián

Abstract

The mass of the gaseous reservoir in young circumstellar discs is a crucial initial condition for the formation of planetary systems, but estimates vary by orders of magnitude. In some discs with resolvable cavities, sharp inner disc warps cast two-sided shadows on the outer rings; can the cooling of the gas as it crosses the shadows bring constraints on its mass? The finite cooling time-scale should result in dust temperature decrements shifted ahead of the optical/IR shadows in the direction of rotation. However, some systems show temperature drops, while others do not. The depth of the drops and the amplitude of the shift depend on the outer disc surface density Sigma through the extent of cooling during the shadow crossing time, and also on the efficiency of radiative diffusion. These phenomena may bear observational counterparts, which we describe with a simple D model. An application to the HD 142527 disc suggests an asymmetry in its shadows, and predicts a greater than or similar to 10 deg shift for a massive gaseous disc, with peak Sigma > 8.3 g cm(-) (2). Another application to the DoAr 44 disc limits the peak surface density to Sigma < 13 g cm(-2).

Más información

Título según WOS: Cooling in the shade of warped transition discs
Título según SCOPUS: Cooling in the shade of warped transition discs
Título de la Revista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volumen: 486
Número: 1
Editorial: Oxford Academic
Fecha de publicación: 2019
Página de inicio: L58
Página final: L62
Idioma: English
DOI:

10.1093/mnrasl/slz059

Notas: ISI, SCOPUS