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Radionuclide Ionization in Protoplanetary Disks: Calculations of Decay Product Radiative Transfer
L. Ilsedore Cleeves, Fred C. Adams, Edwin A. Bergin +1
We present simple analytic solutions for the ionization rate arising from the decay of short-lived radionuclides (SLRs) within protoplanetary disks. We solve the rad…
A Significantly Low CO Abundance Toward the TW Hya Protoplanetary Disk: A Path to Active Carbon Chemistry?
Cécile Favre, L. Ilsedore Cleeves, Edwin A. Bergin +2
In this Letter we report the CO abundance relative to H2 derived toward the circumstellar disk of the T-Tauri star TW Hya from the HD (1-0) and C18O (2-1) emission lines. The HD (1…
Exclusion of Cosmic Rays in Protoplanetary Disks: Stellar and Magnetic Effects
L. Ilsedore Cleeves, Fred C. Adams, Edwin A. Bergin
(Abridged) 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 d…
Irradiated Interfaces in the Ara OB1, Carina, Eagle Nebula, and Cyg OB2 Massive Star Formation Regions
P. Hartigan, J. Palmer, L. I. Cleeves
Regions of massive star formation offer some of the best and most easily-observed examples of radiation hydrodynamics. Boundaries where fully-ionized H II regions transition to neu…
An Old Disk That Can Still Form a Planetary System
Edwin A. Bergin, L. Ilsedore Cleeves, Uma Gorti +11
From the masses of planets orbiting our Sun, and relative elemental abundances, it is estimated that at birth our Solar System required a minimum disk mass of ~0.01 solar masses wi…