In this paper, I present background knowledge for high energy processes in Young Stellar Objects(YSO), including observation results, theoretical model. In addition, I also summarize the recent development in the field of high energy processes in YSO, especially the relationship between X-ray luminosity and rotational period. 1. Young Stellar Objects(YSO) Pierre-Simon Laplace in his Expositiond...

Recent observation of 850μm sub-mm polarization from T Tauri disks opens up the possibility of studying magnetic field structure within protostellar disks. The degree of polarization is around 3 % and the direction of polarization is perpendicular to the disk. Since thermal emission from dust grains dominates the spectral energy distribution at the sub-mm/FIR regime, dust grains are thought to ...

The microscopic green alga Ostreococcus tauri is rapidly emerging as a promising model organism in the green lineage. In particular, recent results by Corellou et al. [Plant Cell 21, 3436 (2009)] and Thommen et al. [PLOS Comput. Biol. 6, e1000990 (2010)] strongly suggest that its circadian clock is a simplified version of Arabidopsis thaliana clock, and that it is architectured so as to be robu...

We have modelled the rotational modulation of X-ray emission from T Tauri stars assuming that they have isothermal, magnetically confined coronae. By extrapolating surface magnetograms we find that T Tauri coronae are compact and clumpy, such that rotational modulation arises from X-ray emitting regions being eclipsed as the star rotates. Emitting regions are close to the stellar surface and in...

We discuss the spectral energy distribution of three very low mass objects in Chamaeleon I for which ground-based spectroscopy and photometry as well as ISO measurements in the mid-infrared are available (Comerr on et al. 2000; Persi et al. 2000). One of these stars (Cha H1) is a bona-de brown dwarf, with mass 0.04{0.05 M. We show that the observed emission is very well described by models of c...

The [Ne II] line at 12.81 microns has been suggested as a potential new probe of the planet formation region of circumstellar disks. It is a potentially powerful diagnostic because the neon in disks is expected to be fully in the gas phase and in atomic form. In addition, the 12.81-micron line probes warm, ionized gas, conditions which are believed to characterize the upper atmosphere of the in...