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12 papers · 2 filters
Probing Protoplanetary Disks with Silicate Emission: Where is the silicate emission zone?
J. E. Kessler-Silacci, C. P. Dullemond, J. -C. Augereau +6
Recent results indicate that the grain size and crystallinity inferred from observations of silicate features may be correlated with spectral type of the central star and/or disk g…
Long-term infrared variability of the UX Ori-type star SV Cep
Attila Juhasz, Timo Prusti, Peter Abraham +1
We investigate the long-term optical-infrared variability of SV Cep, and explain it in the context of an existing UX Ori (UXOR) model. A 25-month monitoring programme was completed…
Chemistry and line emission from evolving Herbig Ae disks
B. Jonkheid, C. P. Dullemond, M. R. Hogerheijde +1
Aims: To calculate chemistry and gas temperature of evolving protoplanetary disks with decreasing mass or dust settling, and to explore the sensitivity of gas-phase tracers. Method…
Modeling Spitzer observations of VV Ser. II. an extended quantum heated nebula and a disk shadow
Klaus M. Pontoppidan, Cornelis P. Dullemond, Geoffrey A. Blake +4
We present mid-infrared Spitzer IRAC and MIPS images of the UX Orionis star VV Ser and the surrounding cloud. The 5.6--70 micron images show bright, localized and nebulous emission…
Modeling Spitzer observations of VV Ser. I. The circumstellar disk of a UX Orionis star
Klaus M. Pontoppidan, Cornelis P. Dullemond, Geoffrey A. Blake +5
We present mid-infrared Spitzer-IRS spectra of the well-known UX Orionis star VV Ser. We combine the Spitzer data with interferometric and spectroscopic data from the literature co…
Spitzer-IRS spectra of disks around T Tauri stars II. PAH emission features
V. C. Geers, J. -C. Augereau, K. M. Pontoppidan +10
Aims: We search for PAH features towards T Tauri stars and compare them with surveys of Herbig Ae/Be stars. The presence and strength of the PAH features are interpreted with disk…
Mid-InfraRed imaging of the circumstellar dust around three Herbig Ae stars : HD135344, CQTau, HD163296
C. Doucet, E. Pantin, P. O. Lagage +1
Planet formation has been known for many years to be tied to the spatial distribution of gas and dust in disks around young stars. To constrain planet formation models, imaging obs…
The Spitzer c2d Survey of Nearby Dense Cores: I: First Direct Detection of the Embedded Source in IRAM 04191+1522
M. M. Dunham, N. J. Evans, T. L. Bourke +9
We report the first detections of the Class 0 protostellar source IRAM 04191+1522 at wavelengths shortward of 60 microns with the Spitzer Space Telescope. We see extended emission…
High-Resolution Spectroscopy in Tr37: Gas Accretion Evolution in Evolved Dusty Disks
Aurora Sicilia-Aguilar, Lee Hartmann, Gabor Furezs +3
Using the Hectochelle multifiber spectrograph, we have obtained high-resolution (R~34,000) spectra in the Halpha region for a large number of stars in the 4 Myr-old cluster Tr 37,…
Inner Rim of A Molecular Disk Spatially Resolved in Infrared CO Emission Lines
M. Goto, T. Usuda, C. P. Dullemond +4
We present high-resolution infrared spectroscopy of the Herbig Ae star HD 141569 A in the CO v=2-1 transition. With the angular resolution attained by the adaptive optics system, t…
Accretion in protoplanetary disks: the imprint of core properties
C. P. Dullemond, A. Natta, L. Testi
In this Letter we present a theoretical scenario to explain the steep correlation between disk accretion rates and stellar masses observed in pre-main sequence stars. We show that…
Models of the Structure and Evolution of Protoplanetary Disks
C. P. Dullemond, D. Hollenbach, I. Kamp +1
We review advances in the modeling of protoplanetary disks. This review will focus on the regions of the disk beyond the dust sublimation radius, i.e. beyond 0.1 - 1 AU, depending…