6 papers · 1 filter
Gas and dust mass in the disk around the Herbig Ae star HD169142
Olja Panić, Michiel R. Hogerheijde, David Wilner +1
We investigate the physical structure of the gas component of the disk around the pre-main-sequence star HD169142. The 13CO and C18O J=2-1 line emission is observed from the disk w…
Molecular data and radiative transfer tools for ALMA
Floris van der Tak, Michiel Hogerheijde
This paper presents an overview of several modeling tools for analyzing molecular line observations at submillimeter wavelengths. These tools are already proving to be very valuabl…
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…