Wall Emission in Circumbinary Disks: The Case of CoKu Tau/4
First Author:
Erick Nagel
Email: e.nagel AT astrosmo.unam.mx
Centro de Radioastronomía y Astrofísica, UNAM
Antigua Carretera a Pátzcuaro 8701, Ex-Hda. San José de la Huerta
Morelia,Michoacán 58089 México
Coauthors:
D'Alessio, Paola, Centro de Radioastronomía y Astrofísica, UNAM
Abstract
Spectra of stellar objects with high resolution obtained with Spitzer are an important source of information required for detailed modeling. A few years ago, CoKu Tau/4 mid-infrared spectra was interpreted due to the emission of the inner boundary wall of a disk. An evacuated region around the star is required because the flux at small wavelengths is completely determinate by the star flux. A former interpretation for the dust gap is either that small grains are coagulated in larger grains, or photoevaporation due to radiation of the star or even, dynamical clearing by a planet. However, a few months ago, CoKu Tau/4 was resolved as two stars, which rejects the previous interpretations and states that the gap is produced by dynamical interactions between a disk and the binary system. Thus, our goal in this work is to model the Spitzer mid-infrared spectra of CoKu Tau/4 using the emission of the inner circumbinary disk wall, but now illuminated by both stars. The comparison between the observation and the model, allows to restrict the orbital parameters of the binary system and to say something of the dust composition of such wall.
Link to PDF
