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Constraining the stellar energetic particle flux in young solar-like stars

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1902.00914v1.pdf (96.46Kb)
Date
13/01/2020
Author
Rab, Ch
Padovani, M.
Güdel, M.
Kamp, I.
Thi, W. -F.
Woitke, P.
Keywords
Stars: pre-main-sequence
(Stars:) circumstellar matter
Stars: activity
Astrochemistry
Radiative transfer
Methods: numerical
QB Astronomy
QC Physics
QD Chemistry
T-NDAS
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Abstract
Anomalies in the abundance measurements of short lived radionuclides in meteorites indicate that the protosolar nebulae was irradiated by a large number of energetic particles (E >∼10 MeV), often called solar cosmic rays. The particle flux of the contemporary Sun cannot explain these anomalies, but, similar to T Tauri stars, the young Sun was more active and probably produced enough high energy particles. However, the stellar particle (SP) flux of young stars is essentially unknown. We model the impact of high-energy ionization sources on the chemistry of the circumstellar environment (disks and envelopes). The model includes X-ray radiative transfer and makes use of particle transport models to calculate the individual molecular hydrogen ionization rates. We study the impact on the chemistry via the ionization tracers HCO+ and N2H+. We argue that spatially resolved observations of those molecules combined with detailed models allow for disentangling the contribution of the individual high-energy ionization sources and to put constraints on the SP flux in young stars.
Citation
Rab , C , Padovani , M , Güdel , M , Kamp , I , Thi , W -F & Woitke , P 2020 , Constraining the stellar energetic particle flux in young solar-like stars . in B G Elmegreen , L V Tóth & M Güdel (eds) , Origins : From the Protosun to the First Steps of Life . Proceedings of the International Astronomical Union , no. S345 , vol. 14 , International Astronomical Union (IAU) , pp. 310-311 , IAU Symposium 345 , Vienna , Austria , 20/08/18 . https://doi.org/10.1017/S174392131900156X
 
conference
 
Publication
Origins
DOI
https://doi.org/10.1017/S174392131900156X
ISSN
1743-9213
Type
Conference item
Rights
Copyright © 2020 International Astronomical Union. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1017/S174392131900156X
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/20235

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