Angular momentum evolution of low-mass pre-main sequence stars via extreme coronal mass ejections

摘要: The angular momentum evolution of cool stars during the pre-main sequence phase stellar remains a major outstanding problem. Multiple processes are likely involved in transfer mass and within out star+disk system. role coronal ejections (CMEs), energetic events which shed magnetic flux Sun, has yet to be fully explored context stars. It is well established that young, solar-type exhibit X-ray activity levels up four orders magnitude higher than present-day suggesting CMEs associated with these extreme flares could an important process for expelling momentum. We present novel approach modeling low-mass uses solar-calibrated CME model observed flare rates young derive loss via calculate their attendant losses phase. While we find modest, ∼10 % steady-state wind values from literature, can substantial, potentially counteracting effects initial spin-up due contraction tens Myr.