A dataset provided by the European Space Agency

Name OT2_lkrist01_2
Title Disentangling energetic feedback in low-mass protostars with CO 16-15
URL

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DOI 10.5270/esa-h8w7fms
Author kristensen, l.
Description During the earliest embedded stages of star formation the young star interacts with its surroundings through high velocity shocks and UV radiation, providing feedback on the medium from which the star is forming. At the same time, in-falling gas is heated to several 100 K by the accretion luminosity. How much energy is lost from the system through each of these processes? Is there an evolutionary trend in terms of the relative contributions from shocks and UV radiation? To address these questions and to observationally differentiate the different heating mechanisms, velocity-resolved observations are required. Herschel-PACS has revealed that highly excited CO emission (up to J=44-43; Eup ~ 5400 K) is present towards most low-mass protostars, revealing a warm-hot component not detected previously with ISO. The PACS observations reveal directly that CO is one of the best tracers of energetic processes in protostars. To quantify emission, a model was constructed incorporating the shock- and UV-heating mechanisms. While the model is successful in reproducing observations from three sources, it also makes very specific predictions regarding the line-shape of velocity-resolved high-J CO emission. The model furthermore predicts an evolutionary sequence where CO emission in younger sources is dominated by shock heating, as opposed to UV-heating being dominant at later evolutionary stages. To test the model and its validity for more than three sources, we propose to observe the highest excited CO line possible with HIFI, the CO 16-15 line. Velocity-resolved data will immediately allow us to quantify how much emission is caused by the different heating mechanisms. Furthermore, such data will allow us to measure the different heating contributions for this line directly, thus benchmarking our model and its underlying assumptions.
Publication Origin of warm and hot gas emission from low-mass protostars: Herschel-HIFI observations of CO J = 16-15. I. Line profiles, physical conditions, and H2O abundance . Kristensen L. E. et al. . Astronomy & Astrophysics, Volume 605, id.A93, 19 pp. . 605 . 10.1051\/0004-6361\/201630127 . 2017A&A...605A..93K ,
Instrument HIFI_HifiPoint_dbs
Temporal Coverage 2012-04-19T12:16:37Z/2012-10-24T14:01:15Z
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 2013-04-24T13:26:22Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-04-24T13:26:22Z, OT2_lkrist01_2, SPG v14.1.0. https://doi.org/10.5270/esa-h8w7fms