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12 papers · 2 filters
Infrared emission in radio galaxy NGC 4261
I. M. van Bemmel, C. P. Dullemond, M. Chiaberge +1
We have analyzed the total and nuclear SED for NGC 4261 and find that the dominant process for the mid- and far-infrared emission in this object is non-thermal emission from the ac…
Millimeter observations and modeling of the AB Aurigae system
D. Semenov, Ya. Pavlyuchenkov, K. Schreyer +3
(Abriged) We present the results of millimeter observations and a suitable chemical and radiative transfer model of the AB Aur (HD 31293) circumstellar disk and surrounding envelop…
Ices in the edge-on disk CRBR 2422.8-3423: Spitzer spectroscopy and Monte Carlo radiative transfer modeling
Klaus M. Pontoppidan, Cornelis P. Dullemond, Ewine F. van Dishoeck +5
We present 5.2-37.2 micron spectroscopy of the edge-on circumstellar disk CRBR 2422.8-3423 obtained using the InfraRed Spectrograph (IRS) of the Spitzer Space Telescope. The IRS sp…
A submillimeter exponential disk in M~51: evidence for an extended cold dust disk
R. Meijerink, R. P. J. Tilanus, C. P. Dullemond +2
A 850 micron map of the interacting spiral galaxy M51 shows well-defined spiral arms, closely resembling the structures seen in CO and HI emission. However, most of the 850 micron…
The gas temperature in the surface layers of protoplanetary disks
I. Kamp, C. P. Dullemond
Models for the structure of protoplanetary disks have so far been based on the assumption that the gas and the dust temperature are equal. The gas temperature, an essential ingredi…
[O I] 6300 A Emission from Disks Around Herbig Ae/Be Stars
M. E. van den Ancker, B. Acke, C. P. Dullemond
We present high spectral-resolution optical spectra of 49 Herbig Ae/Be stars in a search for the [O I] 6300.2 A line. The vast majority of the stars in our sample show narrow (FWHM…
A "Starless" Core that Isn't: Detection of a Source in the L1014 Dense Core with the Spitzer Space Telescope
C. H. Young, J. K. Joergensen, Y. L. Shirley +27
We present observations of L1014, a dense core in the Cygnus region previously thought to be starless, but data from the Spitzer Space Telescope shows the presence of an embedded s…
Spitzer Space Telescope Spectroscopy of Ices toward Low Mass Embedded Protostars
A. Boogert, K. Pontoppidan, F. Lahuis +23
Sensitive 5-38 um Spitzer Space Telescope (SST) and ground based 3-5 um spectra of the embedded low mass protostars B5 IRS1 and HH46 IRS show deep ice absorption bands superposed o…
Evolution of Young Brown Dwarf Disks in the Mid-Infrared
Michael F. Sterzik, Ilaria Pascucci, Daniel Apai +2
We have imaged two bona-fide brown dwarfs with TReCS/GEMINI-S and find mid-infrared excess emission that can be explained by optically thick dust disk models. In the case of the yo…
The effect of dust settling on the appearance of protoplanetary disks
C. P. Dullemond, C. Dominik
We analyze how the process of dust settling affects the spectral energy distribution and optical appearance of protoplanetary disks. Using simple analytic estimates on the one hand…
The 2D Continuum Radiative Transfer Problem: Benchmark Results for Disk Configurations
I. Pascucci, S. Wolf, J. Steinacker +5
We present benchmark problems and solutions for the continuum radiative transfer (RT) in a 2D disk configuration. The reliability of three Monte-Carlo and two grid-based codes is t…
Flaring vs. self-shadowed disks: the SEDs of Herbig Ae/Be stars
C. P. Dullemond, C. Dominik
Isolated Herbig Ae stars can be divided into two groups (Meeus et al. 2001): those with an almost flat spectral energy distribution in the mid-infrared (`group I'), and those with…