A dataset provided by the European Space Agency

Name OT2_mguedel_2
Title Tracing protostellar disk ionisation with far-infrared lines
URL

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DOI 10.5270/esa-b09ll7h
Author guedel, m.
Description Protoplanetary gas and dust disks around T Tauri stars are the most important elements in the process of planet formation. In particular, the dissipation time scale of disks sets a critical time limit for planet formation. The mechanisms of disk dissipation are poorly understood, however. Apart from the planet formation process itself, photoevaporation and disk instabilities induced by the magneto- rotational instability are key candidates. In both cases, heating and ionisation by stellar short-wavelength radiation plays a crucial role. High-energy stellar radiation (X-rays, extreme ultraviolet) also drives chemical networks in circumstellar disks, forming key molecules that eventually become important for the formation of life in habitable zones. However, there is little information on the X-ray radiation spectrum impinging on the disk, given various sources of photoelectric absorption. We will study disk ionisation and X-ray driven chemistry by observing X-ray sensitive lines in an outstanding and unique sample of three classical T Tauri stars in which X-rays appear to be blocked before reaching the disk. We will compare the results with a control sample of disks that appear to be irradiated by high levels of stellar X-ray radiation. Our X-ray sensitive lines include transitions from HCN, HCO+, and ortho-NH3. The interpretation of our results will be based on thermo-chemical codes developed in the proposing team.
Publication
Instrument HIFI_HifiPoint_dbs
Temporal Coverage 2012-07-31T12:16:18Z/2012-08-29T11:06:38Z
Version SPG v14.1.0
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-02-28T11:02:19Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-02-28T11:02:19Z, OT2_mguedel_2, SPG v14.1.0. https://doi.org/10.5270/esa-b09ll7h