Universität zu Köln

Matter, A., Labadie, L., Augereau, J. C., Kluska, J., Crida, A., Carmona, A., Gonzalez, J. F., Thi, W. F., Le Bouquin, J. -B., Olofsson, J. and Lopez, B. (2016). Inner disk clearing around the Herbig Ae star HD139614: Evidence for a planet-induced gap? Astron. Astrophys., 586. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Spatially resolving the inner dust cavity (or gap) of the so-called (pre-) transitional disks is a key to understanding the connection between the processes of planetary formation and disk dispersal. The disk around the Herbig star HD139614 is of particular interest since it presents a pretransitional nature with an au-sized gap structure that is spatially resolved by mid-infrared interferometry in the dust distribution. With the aid of new near-infrared interferometric observations, we aim to characterize the 0.1-10 au region of the HD 139614 disk further and then identify viable mechanisms for the inner disk clearing. We report the first multiwavelength modeling of the interferometric data acquired on HD 139614 with the VLTI instruments PIONIER, AMBER, and MIDI, complemented by Herschel/PACS photometric measurements. We first performed a geometrical modeling of the new near-infrared interferometric data, followed by radiative transfer modeling of the complete dataset using the code RADMC3D. We confirm the presence of a gap structure in the warm mu m-sized dust distribution, extending from about 2.5 au to 6 au, and constrained the properties of the inner dust component: e.g., a radially increasing dust surface density profile, and a depletion in dust of similar to 10(3) relative to the outer disk. Since self-shadowing and photoevaporation appears unlikely to be responsible for the au-sized gap of HD 139614, we thus tested if dynamical clearing could be a viable mechanism using hydrodynamical simulations to predict the structure of the gaseous disk. Indeed, a narrow au-sized gap is consistent with the expected effect of the interaction between a single giant planet and the disk. Assuming that small dust grains are well coupled to the gas, we found that an approximately 3 M-jup planet located at similar to 4.5 au from the star could, in less than 1 Myr, reproduce most of the aspects of the dust surface density profile, while no significant depletion (in gas) occurred in the inner disk, in contrast to the dust. However, this dust-depleted inner disk could be explained by the expected dust filtration by the gap and the efficient dust growth/fragmentation occurring in the inner disk regions. Our results support the hypothesis of a giant planet opening a gap and shaping the inner region of the HD 139614 disk. This makes HD 139614 an exciting candidate specifically for witnessing planet-disk interaction.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Matter, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Labadie, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Augereau, J. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kluska, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Crida, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Carmona, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gonzalez, J. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thi, W. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Le Bouquin, J. -B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Olofsson, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lopez, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-286102
DOI:	10.1051/0004-6361/201525793
Journal or Publication Title:	Astron. Astrophys.
Volume:	586
Date:	2016
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SPECTRAL ENERGY-DISTRIBUTIONS; MILLIMETER-WAVE PROPERTIES; YOUNG STELLAR OBJECTS; VEGA-LIKE SYSTEMS; PROTOPLANETARY DISKS; AE/BE STARS; CIRCUMSTELLAR DISKS; GRAIN-GROWTH; HD 139614; TRANSITIONAL DISKS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28610