Radial distribution of the carbonaceous nano-grains in the protoplanetary disk around HD 169142

Abstract

HD 169142 is part of the class of (pre-)transitional protoplanetary disks showing multiple carbon nanodust spectroscopic signatures (aromatic, aliphatic) dominating the infrared spectrum. Precise constraints on the spatial distribution and properties of carbonaceous dust particles are essential to understanding the physics of the disk. The HD 169142 disk is seen almost face-on and thus offers a unique opportunity to study the dust radial evolution. We investigate the spatial distribution and properties of the carriers of several dust aromatic emission features in the disk across a broad spatial range (10-200 AU). We analysed imaging and spectroscopic observations in the 8-12 microns range from VLT/VISIR, as well as adaptive optics spectroscopic observations in the 3-4 microns range from VLT/NACO. The data probes the spatial evolution of the 3.3, 8.6, and 11.3 microns aromatic bands. To constrain the radial distribution of carbonaceous nano-grains, the observations were compared to models using The Heterogeneous dust Evolution Model for Interstellar Solids (THEMIS), integrated into the POLARIS radiative transfer code by calculating the thermal and stochastic heating of sub-micrometer dust grains. Our data show predominant nano-particle emission at all radii (resolution of about 0.1", 12 AU at 3 microns and 0.3", 35 AU at 10 microns) in the HD 169142 disk. This unambiguously shows that carbonaceous nano-grains dominate radiatively the infrared spectrum in most of the disk, as suggested by previous studies. In order to account for both VISIR and NACO emission maps, we show the need for aromatic particles distributed within the disk from the outermost regions to a radius of 20 AU, corresponding to the outer limit of the inner cavity derived from previous observations. In the inner cavity, these aromatic particles might be present but their abundance would then be significantly decreased.

arXiv comment11 pages, 8 figures

References in corpus (51)

• The effects of snowlines on C/O in planetary atmospheres
• The rich 6 to 9 um spectrum of interstellar PAHs
• ISO spectroscopy of circumstellar dust in 14 Herbig Ae/Be systems: towards an understanding of dust processing
• The evolution of amorphous hydrocarbons in the ISM: dust modelling from a new vantage point
• Consistent dust and gas models for protoplanetary disks. I. Disk shape, dust settling, opacities, and PAHs
• The global dust modelling framework THEMIS (The Heterogeneous dust Evolution Model for Interstellar Solids)
• On the Diversity of the Taurus Transitional Disks: UX Tau A & Lk Ca 15
• Accretion Rates in Herbig Ae stars
• Lucky Imaging: High Angular Resolution Imaging in the Visible from the Ground
• ISO spectroscopy of disks around Herbig Ae/Be stars
• ALMA unveils rings and gaps in the protoplanetary system HD 169142: signatures of two giant protoplanets
• [O I] 6300A emission in Herbig Ae/Be systems: signature of Keplerian rotation
• Radiative transfer with POLARIS: I. Analysis of magnetic fields through synthetic dust continuum polarization measurements
• Discovery of a Companion Candidate in the HD169142 Transition Disk and the Possibility of Multiple Planet Formation
• Molecular abundances and C/O ratios in chemically evolving planet-forming disk midplanes
• Evolution of emission line activity in intermediate mass young stars
• Gaps in the HD169142 protoplanetary disk revealed by polarimetric imaging: Signs of ongoing planet formation?
• Spitzer's view on aromatic and aliphatic hydrocarbon emission in Herbig Ae stars
• Identifying gaps in flaring Herbig Ae/Be disks using spatially resolved mid-infrared imaging. Are all group I disks transitional?
• An Enigmatic Pointlike Feature within the HD 169142 Transitional Disk
• PAH emission from Herbig AeBe stars
• Mid-infrared spectra of PAH emission in Herbig AeBe stars
• Dust variations in the diffuse interstellar medium: constraints on Milky Way dust from Planck-HFI observations
• Mid-IR imaging of the transitional disk of HD169142: Measuring the size of the gap
• Imaging the Inner and Outer Gaps of the Pre-Transitional Disk of HD 169142 at 7 mm
• A hidden reservoir of Fe/FeS in interstellar silicates?
• Polarized disk emission from Herbig Ae/Be stars observed using Gemini Planet Imager: HD 144432, HD 150193, HD 163296, and HD 169142
• Constraining the structure of the planet-forming region in the disk of the Herbig Be star HD 100546
• Polycyclic aromatic hydrocarbon ionization as a tracer of gas flows through protoplanetary disk gaps
• Investigation of the inner structures around HD169142 with VLT/SPHERE
• Spatially resolved PAH emission in the inner disks of Herbig Ae/Be stars
• Detailed structure of the outer disk around HD 169142 with polarized light in H-band
• The GRAVITY Young Stellar Object survey -- I. Probing the disks of Herbig Ae/Be stars in terrestrial orbits
• Polycyclic Aromatic Hydrocarbon in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars
• Mantle formation, coagulation and the origin of cloud/core-shine: II. Comparison with observations
• HD 169142 in the eyes of ZIMPOL/SPHERE
• Variability of Disk Emission in Pre-Main Sequence and Related Stars. III. Exploring Structural Changes in the Pre-transitional Disk in HD 169142
• Modeling dust emission in the Magellanic Clouds with Spitzer and Herschel
• Asymmetric mid-plane gas in ALMA images of HD~100546
• Dust evolution across the Horsehead Nebula
• Nano carbon dust emission in proto-planetary disks: the aliphatic-aromatic components
• Interferometric Evidence for Quantum Heated Particles in the Inner Region of Protoplanetary Disks around Herbig Stars
• Gaia
• The Fornax 3D project: dust mix and gas properties in the center of early-type galaxy FCC 167
• Dust and Polycyclic Aromatic Hydrocarbon in the Pre-Transitional Disk around HD 169142
• First MATISSE L-band observations of HD 179218. Is the inner 10 au region rich in carbon dust particles?
• A study of dust properties in the inner sub-au region of the Herbig Ae star HD 169142 with VLTI/PIONIER
• Multi-wavelength observations and modelling of a quiescent cloud LDN1512
• Influence of the nano-grain depletion in photon-dominated regions: Application to the gas physics and chemistry in the Horsehead
• Spatial distribution of the aromatic and aliphatic carbonaceous nano-grain features in the protoplanetary disk around HD 100546
• Tiny Grains Shining Bright in the Gaps of Herbig Ae Transitional Discs

Cited by in corpus (3)

• Spatially resolving polycyclic aromatic hydrocarbons in Herbig Ae disks with VISIR-NEAR at the VLT
• Polycyclic aromatic hydrocarbon (PAH) abundances in the disk around T Chamaeleontis (T Cha): PAH sizes, ionization fraction, and mass during JWST observations
• Observational evidence for a possible link between PAH emission and dust trap locations in protoplanetary disks