EXCLUSION OF COSMIC RAYS IN PROTOPLANETARY DISKS: STELLAR AND MAGNETIC EFFECTS
Cosmic rays (CRs) are thought to provide an important source of ionization in the outermost and densest regions of protoplanetary disks; however, it is unknown to what degree they are physically present. In this work, we explore the hitherto neglected effects of CR modulation by both stellar winds a...
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| Veröffentlicht in: | The Astrophysical journal 2013-07, Vol.772 (1), p.1-20 |
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| creator | CLEEVES, L ILSEDORE Adams, Fred C Bergin, Edwin A |
| description | Cosmic rays (CRs) are thought to provide an important source of ionization in the outermost and densest regions of protoplanetary disks; however, it is unknown to what degree they are physically present. In this work, we explore the hitherto neglected effects of CR modulation by both stellar winds and magnetic field structures and study how these processes act to reduce disk ionization rates. We construct a two-dimensional protoplanetary disk model of a T-Tauri star system, focusing on ionization from stellar and interstellar FUV, stellar X-ray photons, and CRs. We show that stellar winds can power a heliosphere-like analog, i.e., a "T-Tauriosphere," diminishing CR ionization rates by several orders of magnitude at low to moderate CR energies (E sub(CR) < 1 GeV). We discuss the implications of a diminished CR ionization rate on the gas physics by estimating the size of the resulting magnetorotational instability dead zones. |
| doi_str_mv | 10.1088/0004-637X/772/1/5 |
| format | Article |
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| source | IOP Publishing Free Content; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COMPUTERIZED SIMULATION COSMIC RADIATION Cosmic rays GEV RANGE HELIOSPHERE INSTABILITY Ionization MAGNETIC FIELDS MODULATION PHOTONS Planet formation PLANETS PROTOPLANETS RADIOISOTOPES SOLAR NEBULA SOLAR SYSTEM SOLAR WIND Stellar winds T TAURI STARS X RADIATION |
| title | EXCLUSION OF COSMIC RAYS IN PROTOPLANETARY DISKS: STELLAR AND MAGNETIC EFFECTS |
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