Dynamo in Protostar
Mahendra K. Verma, Bidya Binay Karak, Rohit Kumar
TL;DR
This paper investigates magnetic dynamo processes in protostars by estimating their magnetic Reynolds numbers before and after deuterium burning, suggesting dynamo activity in both phases and aligning magnetic field estimates with observations.
Contribution
It provides the first estimation of magnetic Reynolds numbers in protostars across different phases, supporting the existence of dynamo processes.
Findings
Magnetic Reynolds number exceeds critical value for dynamo action in both phases.
Estimated magnetic field strength is around kilo-gauss, matching observations.
Dynamo process likely active throughout protostar evolution.
Abstract
In this paper, we estimate the magnetic Reynolds number of a typical protostar before and after deuterium burning, and claim for the existence of dynamo process in both the phases, because the magnetic Reynolds number of the protostar far exceeds the critical magnetic Reynolds number for dynamo action. Using the equipartition of kinetic and magnetic energies, we estimate the steady-state magnetic field of the protostar to be of the order of kilo-gauss, which is in good agreement with observations.
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