An N band interferometric survey of the disks around post-AGB binary stars

Abstract

It is now well established that FGK post-AGB stars that are surrounded by both hot and cold dust (as derived from the spectral energy distribution), are almost always part of a binary system with $100<P_{orb}<5000$~days. The properties and long-term stability of the dust emission requires it to arise from a gas- and dust-rich, puffed-up and (semi-)stable circumbinary disk. This interpretation has been confirmed with spatially resolved observations at a range of wavelengths for various individual objects. Here I present the first results of the first mid-IR interferometric survey of this class of objects. Our sample comprises 18 sources, most of which are confirmed binaries and which cover a range in IR excess. Our analysis clearly shows the compactness of the dust structures in these systems. We perform a statistical comparison with radiative transfer disk models, showing that most objects are indeed continuous disks from the sublimation radius outwards.

To appear in the proceedings of "Physics of evolved stars 2015 - A conference dedicated to the memory of Olivier Chesneau" (http://poe2015.sciencesconf.org/)

References in corpus (5)

• Optically visible post-AGB/RGB stars and young stellar objects in the Small Magellanic Cloud: candidate selection, spectral energy distributions and spectroscopic examination
• ALMA observations of the Red Rectangle, a preliminary analysis
• Detection of Keplerian dynamics in a disk around the post-AGB star AC Her
• Are Proto-Planetary Nebulae Shaped by a Binary? Results of a Long-Term Radial Velocity Study
• The evolved circumbinary disk of AC Her: a radiative transfer, interferometric and mineralogical study

Cited by in corpus (1)

• ALMA observations of the nearby AGB star L${}_2$ Puppis. II. Gas disk properties derived from ${}^{12}$CO and ${}^{13}$CO $J=$3$-$2 emission