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Constraints on the Radial Variation of Grain Growth in the AS 209 Circumstellar Disk
Laura M. Pérez, John M. Carpenter, Claire J. Chandler +18
We present dust continuum observations of the protoplanetary disk surrounding the pre-main sequence star AS 209, spanning more than an order of magnitude in wavelength from 0.88 to…
Kinematics of the CO Gas in the Inner Regions of the TW Hya Disk
Katherine A. Rosenfeld, Chunhua Qi, Sean M. Andrews +7
We present a detailed analysis of the spatially and spectrally resolved 12CO J=2-1 and J=3-2 emission lines from the TW Hya circumstellar disk, based on science verification data f…
Breaking through: The effects of a velocity distribution on barriers to dust growth
Fredrik Windmark, Til Birnstiel, Chris Ormel +1
It is unknown how far dust growth can proceed by coagulation. Obstacles to collisional growth are the fragmentation and bouncing barriers. However, in all previous simulations of t…
Synthetic observations of first hydrostatic cores in collapsing low-mass dense cores. I. Spectral energy distributions and evolutionary sequence
Benoit Commercon, Ralf Launhardt, Cornelis P. Dullemond +1
The low-mass star formation evolutionary sequence is relatively well-defined both from observations and theoretical considerations. The first hydrostatic core is the first protoste…
Understanding hydrogen recombination line observations with ALMA and EVLA
Thomas Peters, Steven N. Longmore, Cornelis P. Dullemond
Hydrogen recombination lines are one of the major diagnostics of H II region physical properties and kinematics. In the near future, the Expanded Very Large Array (EVLA) and the At…
Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow
Aurora Sicilia-Aguilar, Ágnes Kóspál, Johny Setiawan +6
We explore the accretion mechanisms in EX Lupi, prototype of EXor variables, during its quiescence and outburst phases. We analyse high-resolution optical spectra taken before, dur…
Mid-Infrared Spectral Variability Atlas of Young Stellar Objects
Á. Kóspál, P. Ábrahám, J. A. Acosta-Pulido +6
Optical and near-infrared variability is a well-known property of young stellar objects. However, a growing number of recent studies claim that a considerable fraction of them also…
Probing Interstellar Dust with Infrared Echoes from the Cas A Supernova
Frédéric P. A. Vogt, Marc-André Besel, Oliver Krause +1
We present the analysis of an IRS 5-38 μm spectrum and MIPS photometric measurements of an infrared echo near the Cassiopeia A supernova remnant observed with the Spitzer Space Tel…
Planetesimal formation by sweep-up: How the bouncing barrier can be beneficial to growth
Fredrik Windmark, Til Birnstiel, Carsten Güttler +3
The formation of planetesimals is often accredited to collisional sticking of dust grains. The exact process is unknown, as collisions between larger aggregates tend to lead to fra…