博士課程３年のToshiki Sato (SATO, Toshiki) Observation papers of Tycho using the Chandra satellite supernova remnant has been published in the Astrophysical Journal magazine。Tycho's supernova remnant、Type Ia supernovae present in the Milky Way(白色矮星の爆発)In the wreckage、Even about 440 years later after the explosion、It continues to expand at a high rate of speed thousands km / s。Sato-kun、X-ray energy from the explosive ejecta moving at this speed is found that is changing Doppler effect、It was the first to succeed in speed measurement of the structure to be redshifted and blue way。This study、Rutgers University John P. It was carried out as a joint research with Hughes Professor。