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Evolutionary Signatures in the Formation of Low-Mass Protostars. II. Towards Reconciling Models and Observations
Michael M. Dunham, Neal J. Evans, Susan Terebey +2
A long-standing problem in low-mass star formation is the "luminosity problem," whereby protostars are underluminous compared to the accretion luminosity expected both from theoret…
Truncated Disks in TW Hya Association Multiple Star Systems
Sean M. Andrews, Ian Czekala, D. J. Wilner +3
We present high angular resolution (down to 0.3" = 13 AU in diameter) Submillimeter Array observations of the 880 micron (340 GHz) thermal continuum emission from circumstellar dus…
The outcome of protoplanetary dust growth: pebbles, boulders, or planetesimals? I. Mapping the zoo of laboratory collision experiments
Carsten Güttler, Jürgen Blum, Andras Zsom +2
The growth processes from protoplanetary dust to planetesimals are not fully understood. Laboratory experiments and theoretical models have shown that collisions among the dust agg…
Evidence for dust clearing through resolved submillimeter imaging
J. M. Brown, G. A. Blake, C. Qi +3
Mid-infrared spectrophotometric observations have revealed a small sub-class of circumstellar disks with spectral energy distributions (SEDs) suggestive of large inner gaps with lo…
Time-Evolution of Viscous Circumstellar Disks due to Photoevaporation by FUV, EUV and X-ray Radiation from the Central Star
Uma Gorti, Kees Dullemond, David Hollenbach
We present the time evolution of viscously accreting circumstellar disks as they are irradiated by ultraviolet and X-ray photons from a low-mass central star. Our model is a hybrid…
Radiative transfer models of mid-infrared H2O lines in the Planet-forming Region of Circumstellar Disks
R. Meijerink, K. M. Pontoppidan, G. A. Blake +2
The study of warm molecular gas in the inner regions of protoplanetary disks is of key importance for the study of planet formation and especially for the transport of H2O and orga…
C2D Spitzer-IRS spectra of disks around T Tauri stars. IV. Crystalline silicates
J. Olofsson, J. -C. Augereau, E. F. van Dishoeck +13
Dust grains in the planet forming regions around young stars are expected to be heavily processed due to coagulation, fragmentation and crystallization. This paper focuses on the c…
A new raytracer for modeling AU-scale imaging of lines from protoplanetary disks
Klaus M. Pontoppidan, Rowin Meijerink, Cornelis P. Dullemond +1
The material that formed the present-day Solar System originated in feeding zones in the inner Solar Nebula located at distances within ~20 AU from the Sun, known as the planet-for…
Episodic formation of cometary material in the outburst of a solar-like young star
P. Ábrahám, A. Juhász, C. P. Dullemond +8
Our Solar System originated in interstellar gas and dust; the latter is in the form of amorphous silicate particles and carbonaceous dust. The composition of cometary material show…
Protoplanetary Disk Structures in Ophiuchus
Sean M. Andrews, D. J. Wilner, A. M. Hughes +2
We present a high angular resolution (0.3" = 40 AU) SMA survey of the 870 micron thermal continuum emission from 9 of the brightest, and therefore most massive, circumstellar disks…
Benchmark problems for continuum radiative transfer. High optical depths, anisotropic scattering, and polarisation
C. Pinte, T. J. Harries, M. Min +5
Solving the continuum radiative transfer equation in high opacity media requires sophisticated numerical tools. In order to test the reliability of such tools, we present a benchma…
The chemical history of molecules in circumstellar disks. I. Ices
R. Visser, E. F. van Dishoeck, S. D. Doty +1
(Abridged) Aims & Methods. A two-dimensional, semi-analytical model is presented that follows, for the first time, the chemical evolution from a collapsing molecular cloud (a pre-s…