|Title||The Gas-to-Dust Ratio in Disks around T Tauri Stars|
|Author||Dr Manuel Guedel|
|Description||The gas-to-dust (G-D) mass ratio in circumstellar disks may deviate from the standard interstellar ratio (100:1) as a consequence, e.g., of dust settling in the disk. We propose to study a sample of large disks around classical T Tau stars to determine the G-D along the sightlines toward the central stars. We apply state-of-the-art 3-D modeling of the geometry and composition of the dust disk based on optical and infrared imaging, photometry and polarimetry. We will derive the gas column density along the sightlines toward the star by measuring the photoelectric absorption in X-ray spectra. We have tested the method in a pilot study on a low-mass T Tau star in Taurus. Molecular Cloud. Here, we request observing time for three objects.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2008-11-14T00:00:00Z, 050210, 17.56_20190403_1200. https://doi.org/10.5270/esa-b644rge|