Spatially extended PAHs in circumstellar disks around T Tauri and Herbig Ae stars

Abstract

Our aim is to determine the presence and location of the emission from polycyclic aromatic hydrocarbons (PAHs) towards low and intermediate mass young stars with disks using large aperture telescopes. VLT-VISIR N-band spectra and VLT-ISAAC and VLT-NACO L-band spectra of 29 sources are presented, spectrally resolving the 3.3, 8.6, 11.2, and 12.6 micron PAH features. Spatial-extent profiles of the features and the continuum emission are derived and used to associate the PAH emission with the disks. The results are discussed in the context of recent PAH-emission disk models. The 3.3, 8.6, and 11.2 micron PAH features are detected toward a small fraction of the T Tauri stars, with typical upper limits between 1E-15 and 5E-17 W/m^2. All 11.2 micron detections from a previous Spitzer survey are confirmed with (tentative) 3.3 micron detections, and both the 8.6 and the 11.2 micron features are detected in all PAH sources. For 6 detections, the spatial extent of the PAH features is confined to scales typically smaller than 0.12-0.34'', consistent with the radii of 12-60 AU disks at their distances (typically 150 pc). For 3 additional sources, WL 16, HD 100546, and TY CrA, one or more of the PAH features are more extended than the hot dust continuum of the disk, whereas for Oph IRS 48, the size of the resolved PAH emission is confirmed as smaller than for the large grains. For HD 100546, the 3.3 micron emission is confined to a small radial extent of 12 +- 3 AU, most likely associated with the outer rim of the gap in this disk. Gaps with radii out to 10-30 AU may also affect the observed PAH extent for other sources. For both Herbig Ae and T Tauri stars, the small measured extents of the 8.6 and 11.2 micron features are consistent with larger (>= 100 carbon atoms) PAHs.

arXiv comment14 pages, 17 figures, accepted for publication in A&A

References in corpus (34)

• Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
• Infrared Emission from Interstellar Dust. II. The Diffuse Interstellar Medium
• Passive irradiated circumstellar disks with an inner hole
• ISO spectroscopy of circumstellar dust in 14 Herbig Ae/Be systems: towards an understanding of dust processing
• From Molecular Cores to Planet-forming Disks: A SIRTF Legacy Program
• Flaring vs. self-shadowed disks: the SEDs of Herbig Ae/Be stars
• PAHs as a tracer of star formation?
• Low-Mass Star Formation and the Initial Mass Function in the Rho Ophiuchi Cloud Core
• C2D Spitzer-IRS spectra of disks around T Tauri stars: I. Silicate emission and grain growth
• ISO spectroscopy of disks around Herbig Ae/Be stars
• A 3-5 micron VLT spectroscopic survey of embedded young low mass stars I: Structure of the CO ice
• Results of the ROTOR-program. I. The long-term photometric variability of classical T Tauri stars
• The origin of crystalline silicates in the Herbig Be star HD100546 and in comet Hale-Bopp
• [O I] 6300A emission in Herbig Ae/Be systems: signature of Keplerian rotation
• Cold Disks: Spitzer Spectroscopy of Disks around Young Stars with Large Gaps
• Astrophysics of Young Star Binaries
• The gas temperature in flaring disks around pre-main sequence stars
• HST/NICMOS2 coronagraphic observations of the circumstellar environment of three old PMS stars: HD 100546, SAO 206462 and MWC 480
• Mid-infrared spectra of PAH emission in Herbig AeBe stars
• PAH chemistry and IR emission from circumstellar disks
• Spitzer-IRS spectra of disks around T Tauri stars II. PAH emission features
• Resolving the disk rotation of HD 97048 and HD 100546 in the [O I] 6300A line: evidence for a giant planet orbiting HD 100546
• PAHs in Circumstellar Disks around Herbig Ae/Be stars
• Detection of crystalline silicates around the T Tauri star Hen 3-600A
• Spatial separation of small and large grains in the transitional disk around the young star IRS 48
• Spatially resolved PAH emission in the inner disks of Herbig Ae/Be stars
• Disks around the Young Stars TW Hya and HD 100546 Imaged at 3.4 Millimeters with the Australia Telescope Compact Array
• Modeling the Infrared Emission from the HD 141569A Disk
• Structuring the HD 141569 A circumstellar dust disk. Impact of eccentric bound stellar companions
• Modeling the gas-phase chemistry of the transitional disk around HD 141569A
• A survey for nanodiamond features in the 3 micron spectra of Herbig Ae/Be stars
• A Resolved Circumstellar Disk around the Herbig Ae Star HD 100546 in the Thermal Infrared
• Structure of the Mid-Infrared Emitting Disk Around WL16
• VLT/NACO adaptive optics imaging of the TY CrA system - A fourth stellar component candidate detected

Cited by in corpus (69)

• The warm gas atmosphere of the HD 100546 disk seen by Herschel (Evidence of a gas-rich, carbon-poor atmosphere?)
• A Spitzer Survey of Mid-Infrared Molecular Emission from Protoplanetary Disks II: Correlations and LTE Models
• A young protoplanet candidate embedded in the circumstellar disk of HD100546
• Hydrocarbon emission rings in protoplanetary disks induced by dust evolution
• The Impact of Dust Evolution and Photoevaporation on Disk Dispersal
• A Spitzer c2d Legacy Survey to Identify and Characterize Disks with Inner Dust Holes
• Identifying gaps in flaring Herbig Ae/Be disks using spatially resolved mid-infrared imaging. Are all group I disks transitional?
• External photoevaporation of protoplanetary discs in sparse stellar groups: the impact of dust growth
• Formation of Water in the Warm Atmospheres of Protoplanetary Disks
• Recovery of the Candidate Protoplanet HD 100546 b with Gemini/NICI and Detection of Additional (Planet-Induced?) Disk Structure at Small Separations
• Dust Processing and Grain Growth in Protoplanetary Disks in the Taurus-Auriga Star-Forming Region
• Tracing the inner edge of the disk around HD 100546 with Ro-vibrational CO Emission Lines
• Surface Layer Accretion in Transitional and Conventional Disks: From Polycyclic Aromatic Hydrocarbons to Planets
• Evidence for CO depletion in the inner regions of gas-rich protoplanetary disks
• A break in the gas and dust surface density of the disc around the T Tauri star IM Lup
• The structure of the protoplanetary disk surrounding three young intermediate mass stars. II. Spatially resolved dust and gas distribution
• Consistent dust and gas models for protoplanetary disks III. Models for selected objects from the FP7 DIANA project
• Observations of Solids in Protoplanetary Disks
• Searching for a link between the magnetic nature and other observed properties of Herbig Ae/Be stars and stars with debris disks
• Polycyclic aromatic hydrocarbon ionization as a tracer of gas flows through protoplanetary disk gaps
• Radiation hydrodynamics simulations of photoevaporation of protoplanetary disks II: Metallicity dependence of UV and X-ray photoevaporation
• Hydrodynamic Photoevaporation of Protoplanetary Disks with Consistent Thermochemistry
• Grain growth signatures in the protoplanetary discs of Chamaeleon and Lupus
• Dust Polarization Toward Embedded Protostars in Ophiuchus with ALMA. III. Survey Overview
• A Census of the Stellar Populations in the Sco-Cen Complex
• The Initial Mass Function and Disk Frequency of the Rho Ophiuchi Cloud: An Extinction-Limited Sample
• Radiation Hydrodynamics Simulations of Photoevaporation of Protoplanetary Disks by Ultra Violet Radiation: Metallicity Dependence
• Polycyclic Aromatic Hydrocarbon in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars
• The Role of Tiny Grains on the Accretion Process in Protoplanetary Disks
• DIGIT survey of far-infrared lines from protoplanetary discs: II. CO
• Warm molecular gas and kinematics in the disc around HD 100546
• Lack of PAH emission toward low-mass embedded young stellar objects
• The characteristics of the IR emission features in the spectra of Herbig Ae stars: Evidence for chemical evolution
• Spatially Resolved 3 micron Spectroscopy of Elias 1: Origin of Diamonds in Protoplanetary Disks
• Mid-Infrared Spectral Variability Atlas of Young Stellar Objects
• Gas temperature structure across transition disk cavities
• Resolving structure of the disk around HD100546 at 7 mm with ATCA
• A Survey for New Stars and Brown Dwarfs in the Ophiuchus Star-forming Complex
• ISPY -- NACO Imaging Survey for Planets around Young stars: Survey description and results from the first 2.5 years of observations
• Radiation hydrodynamics simulations of protoplanetary disks: Stellar mass dependence of the disk photoevaporation rate
• PAH emission in the proplyd HST10: what is the mechanism behind photoevaporation?
• The transiting dust clumps in the evolved disk of the Sun-like UXor RZ Psc
• Destruction of refractory carbon grains drives the final stage of proto-planetary disk chemistry
• Resolving the terrestrial planet forming regions of HD113766 and HD172555 with MIDI
• HD 95881: A gas rich to gas poor transition disk?
• A JWST/MIRI analysis of the ice distribution and PAH emission in the protoplanetary disk HH 48 NE
• 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
• PAHs in protoplanetary disks: emission and X-ray destruction
• Searching for spectroscopic binaries within transition disk objects
• Stability of Polycyclic Aromatic Hydrocarbon Clusters in Protoplanetary Disks
• The twofold debris disk around HD 113766 A - Warm and cold dust as seen with VLTI/Midi and Herschel/Pacs
• Mid-IR observations of circumstellar disks -- Part III: A mixed sample of PMS stars and Vega-type objects
• The dusty disk around VV Ser
• Gap Opening and Inner Disk Structure in the Strongly Accreting Transition Disk of DM Tau
• Evolution of PAHs in protoplanetary disks
• First MATISSE L-band observations of HD 179218. Is the inner 10 au region rich in carbon dust particles?
• The spatial extent of Polycyclic Aromatic Hydrocarbons emission in the Herbig star HD 179218
• Where is the warm H2 ? A search for H2 emission from disks around Herbig Ae/Be stars
• A resolved and asymmetric ring of PAHs within the young circumstellar disk of IRS 48
• Organic Matter in Space - an Overview
• The Mid-Infrared Polarization of the Herbig Ae Star WL 16: An Interstellar Origin?
• Spectroscopy of Candidate Members of the Sco-Cen Complex
• Spatially resolving polycyclic aromatic hydrocarbons in Herbig Ae disks with VISIR-NEAR at the VLT
• Photoevaporation Can Reproduce Extended ${\mathrm{H}}_2$ Emission from Protoplanetary Disks Imaged by JWST MIRI
• Tiny Grains Shining Bright in the Gaps of Herbig Ae Transitional Discs
• Mid-infrared Multi-wavelength Imaging of Ophiuchus\,IRS\,48\,Transitional Disk
• The eclipsing binary TY CrA revisited: What near-IR light curves tell us
• Observational evidence for a possible link between PAH emission and dust trap locations in protoplanetary disks