251 citations · 4.4k across the 57 of their papers we have counts for
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Rapid Molecular Cloud and Star Formation: Mechanisms and Movies
Fabian Heitsch, Lee Hartmann
We demonstrate that the observationally inferred rapid onset of star formation after parental molecular clouds have assembled can be achieved by flow-driven cloud formation of atom…
Long-wavelength excesses of FU Orionis objects: flared outer disks or infalling envelopes?
Zhaohuan Zhu, Lee Hartmann, Nuria Calvet +3
The mid- to far-infrared emission of the outbursting FU Orionis objects has been attributed either to a flared outer disk or to an infalling envelope. We revisit this issue using d…
A Spitzer view of protoplanetary disks in the gamma Velorum cluster
Jesus Hernandez, Lee Hartmann, Nuria Calvet +4
We present new Spitzer Space Telescope observations of stars in the young ~5 Myr gamma Velorum stellar cluster. Combining optical and 2MASS photometry, we have selected 579 stars a…
Fragmentation of Shocked Flows: Gravity, Turbulence and Cooling
F. Heitsch, L. Hartmann, A. Burkert +1
The observed rapid onset of star formation in molecular clouds requires rapid formation of dense fragments which can collapse individually before being overtaken by global gravitat…
A large-scale optical-near infrared survey for brown dwarfs and very low-mass stars in the Orion OB1 association
Juan José Downes, César Briceño, Jesús Hernández +3
We report the initial results of a large-scale optical-near infrared survey to extend the known young population of the entire Orion star-forming region down to the substellar doma…
The Disk Population of the Chamaeleon I Star-Forming Region
K. L. Luhman, L. E. Allen, P. R. Allen +6
We present a census of circumstellar disks in the Chamaeleon I star-forming region. Using the Infrared Array Camera and the Multiband Imaging Photometer onboard the Spitzer Space T…