The gas-to-dust (G/D) mass ratio in circumstellar disks may deviate from thestandard interstellar ratio (100:1) as a consequence, e.g., of dust settling inthe disk. We propose to study a sample of large disks around classical T Taustars to determine the G/D along the sightlines toward the central stars. Weapply state-of-the-art 3-D modeling of the geometry and composition of the dustdisk based on optical and infrared imaging, photometry and polarimetry. We willderive the gas column density along the sightlines toward the star by measuringthe photoelectric absorption in X-ray spectra. We have tested the method in apilot study on a low-mass T Tau star in Taurus. Molecular Cloud. Here, werequest observing time for three objects.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2007-09-07T08:31:10Z/2007-09-07T16:03:59Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Dr Manuel Guedel, 2008, 'The Gas-to-Dust Ratio in Disks around T Tauri Stars', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-b644rge
