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 https://doi.org/10.5270/esa-b09ll7h
Author guedel, m.
Description Protoplanetary gas and dust disks around T Tauri stars are the most importantelements in the process of planet formation. In particular, the dissipation timescale of disks sets a critical time limit for planet formation. The mechanismsof disk dissipation are poorly understood, however. Apart from the planet formationprocess 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 circumstellardisks, forming key molecules that eventually become important for the formationof life in habitable zones. However, there is little information on the X-ray radiationspectrum 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 basedon 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 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
    Creator Contact https://support.cosmos.esa.int/h®erschel/
    Date Published 2013-02-28T11:02:19Z
    Keywords Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE
    Publisher And Registrant European Space Agency
    Credit Guidelines European Space Agency, guedel et al., 2013, 'Tracing protostellar disk ionisation with far-infrared lines', SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-b09ll7h