HD139614: the interferometric case for a group-Ib pre-transitional young disk

TL;DR

This study uses interferometry to analyze the disk structure of the young star HD 139614, revealing a two-component disk consistent with a pre-transitional stage, highlighting its potential for future imaging studies.

Contribution

First detailed interferometric analysis of HD 139614's disk structure supporting its classification as a pre-transitional disk.

Findings

A two-component disk model fits the observations well.

Inner disk is optically thin and 2 AU wide.

Outer disk begins at 5.6 AU with a temperature gradient.

Abstract

The Herbig Ae star HD 139614 is a group-Ib object, which featureless SED indicates disk flaring and a possible pre-transitional evolutionary stage. We present mid- and near-IR interferometric results collected with MIDI, AMBER and PIONIER with the aim of constraining the spatial structure of the 0.1-10 AU disk region and assess its possible multi-component structure. A two-component disk model composed of an optically thin 2-AU wide inner disk and an outer temperature-gradient disk starting at 5.6 AU reproduces well the observations. This is an additional argument to the idea that group-I HAeBe inner disks could be already in the disk-clearing transient stage. HD 139614 will become a prime target for mid-IR interferometric imaging with the second-generation instrument MATISSE of the VLTI.