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Hot Organic Molecules Toward a Young Low-Mass Star: A Look at Inner Disk Chemistry
F. Lahuis, E. F. van Dishoeck, A. C. A. Boogert +8
Spitzer Space Telescope spectra of the low mass young stellar object (YSO) IRS 46 (L_bol ~ 0.6 L_sun) in Ophiuchus reveal strong vibration-rotation absorption bands of gaseous C2H2…
The Onset of Planet Formation in Brown Dwarf Disks
D. Apai, I. Pascucci, J. Bouwman +3
The onset of planet formation in protoplanetary disks is marked by the growth and crystallization of sub-micron-sized dust grains accompanied by dust settling toward the disk mid-p…
C2D Spitzer-IRS spectra of disks around T Tauri stars: I. Silicate emission and grain growth
J. E. Kessler-Silacci, J. -C. Augereau, C. P. Dullemond +10
Infrared ~5--35 um spectra for 40 solar-mass T Tauri stars and 7 intermediate-mass Herbig Ae stars with circumstellar disks were obtained using the Spitzer Space Telescope as part…
Chemistry and line emission of outer protoplanetary disks
Inga Kamp, Cornelis P. Dullemond, Michiel Hogerheijde +1
The structure and chemistry of protoplanetary disks depends strongly on the nature of the central star around which it has formed. The dust temperature is mainly set by the stellar…
Protostellar holes: Spitzer Space Telescope observations of the protostellar binary IRAS16293-2422
J. K. Jorgensen, F. Lahuis, F. L. Schoeier +7
Mid-infrared (23-35 micron) emission from the deeply embedded "Class 0" protostar IRAS16293-2422 is detected with the Spitzer Space Telescope infrared spectrograph. A detailed radi…
Flaring and self-shadowed disks around Herbig Ae stars: simulations for 10 micron interferometers
R. van Boekel, C. P. Dullemond, C. Dominik
We present simulations of the interferometric visibilities of Herbig Ae star disks. We investigate whether interferometric measurements in the 10 micrometer atmospheric window are…
Evolutionary Signatures in the Formation of Low-Mass Protostars
Chadwick H. Young, Neal J. Evans
We present an evolutionary picture of a forming star. We assume a singular, isothermal sphere as the initial state of the core that undergoes collapse as described by \citet{shu77}…
[O I] 6300A emission in Herbig Ae/Be systems: signature of Keplerian rotation
B. Acke, M. E. van den Ancker, C. P. Dullemond
We present high spectral-resolution optical spectra of 49 Herbig Ae/Be stars in a search for the [O I] 6300A line. The vast majority of the stars in our sample show narrow (FWHM <…
Projection of circumstellar disks on their environments
K. M. Pontoppidan, C. P. Dullemond
We use a 3D Monte Carlo radiative transfer code to study the projection of large shadows by circumstellar disks around young stellar objects on surrounding reflection nebulosity. I…
Clumpy tori around active galactic nuclei
C. P. Dullemond, I. M. van Bemmel
We discuss the question whether the matter in dusty tori around active galactic nuclei has a smooth or a clumpy structure. Nenkova, Ivezic & Elitzur (2002) have argued that the lac…
Evaporation of ion-irradiated disks
C. P. Dullemond, H. C. Spruit
We calculate the evaporation of a cool accretion disk around a black hole due to the ion-bombardment by an ion supported accretion flow (here ISAF, or optically thin ADAF). As firs…