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

Ch Rab, M. Padovani, M. Güdel, I. Kamp, W. -F. Thi, P. Woitke

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.
Original languageEnglish
Title of host publicationOrigins
Subtitle of host publicationFrom the Protosun to the First Steps of Life
EditorsBruce G. Elmegreen, L. Viktor Tóth, Manuel Güdel
PublisherInternational Astronomical Union (IAU)
Publication statusPublished - 13 Jan 2020
EventIAU Symposium 345 - Vienna, Austria
Duration: 20 Aug 201823 Aug 2018
Conference number: 345

Publication series

NameProceedings of the International Astronomical Union
PublisherCambridge University Press
ISSN (Print)1743-9213


ConferenceIAU Symposium 345
Internet address


  • Stars: pre-main-sequence
  • (Stars:) circumstellar matter
  • Stars: activity
  • Astrochemistry
  • Radiative transfer
  • Methods: numerical


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