4 papers
From Infall to Rotation around Young Stars: The Origin of Protoplanetary Disks
Michiel R. Hogerheijde
The origin of disks surrounding young stars has direct implications for our understanding of the formation of planetary systems. In the interstellar clouds from which star form, an…
Molecular Abundances in B68
J. Di Francesco, M. R. Hogerheijde, W. J. Welch +1
Abundances for C18O, CS, NH3, H2CO, C3H2, and N2H+ and upper limits for the abundances of 13CO and HCO+ are derived for gas within the Bok globule B68 using our own BIMA array data…
The Serpens Star-Forming Region in HCO+, HCN, and N2H+
Michiel R. Hogerheijde
This poster presents single-dish and aperture-synthesis observations of the J=1-0 (lambda~3 mm) transitions of HCO+, HCN, and N2H+ towards the Serpens star-forming region. Jets dri…
An accelerated Monte Carlo method to solve two-dimensional radiative transfer and molecular excitation
Michiel R. Hogerheijde, Floris F. S. van der Tak
We present a numerical method and computer code to calculate the radiative transfer and excitation of molecular lines. Formulating the Monte Carlo method from the viewpoint of cell…