How stars like the Sun and planets like the Earth are formed? In order to answer this question, I have been using radio telescopes, particularly radio interferometers, to observe nearby star and planet forming regions. Radio interferometers allow us to observe fine structures of dense cores and disks where stars and planets form. In order to have better observational tools, I also have been working to build radio telescopes (Submillimeter Array and Atacama Millimeter and Submillimeter Array). My near future goal is to image protoplanetary disks at a resolution of 0.01”. I am also collaborating with people observing protoplanetary disks at NIR as well.
Ohashi, N., Saigo, K., Aso, Y., Aikawa, Y., Koyamatsu, S., Machida, M. N., Saito, M., Takahashi, S. Z., Takakuwa, S., Tomida, K., Tomisaka K., Yen, H.-W. (2014), Formation of a Keplerian Disk in the Infalling Envelope around L1527 IRS: Transformation from Infalling Motions to Kepler Motions,
Astrophys. J., 796, 131.
Aso, Y., Ohashi, N., Saigo, K., Koyamatsu, S., Aikawa, Y., Hayashi, M., Machida, M. N., Saito, M., Takakuwa, S., Tomida, K., Tomisaka, K., Yen, H.-W. (2015), ALMA Observations of the Transition from Infall Motion to Keplerian Rotation around the Late-phase Protostar TMC-1A, Astrophys. J., 812, 27.
Koyamatsu, S., Takakuwa, S., Hayashi, M., Mayama, S., Ohashi, N. (2014),
The Disappearing Envelope around the Transitional Class I Object L43, Astronomy and Astrophysics, 789, 95.
Yen, H.-W., Takakuwa, S., Koch, P. M., Aso, Y., Koyamatsu, S., Krasnopolsky, R., Ohashi, N. (2015), No Keplerian Disk >10 AU Around the Protostar B335: Magnetic Braking or Young Age?, Astronomy and Astrophysics, 812, 129.
Yen, H.-W., Takakuwa, S., Ohashi, N., Aikawa, Y., Aso, Y., Koyamatsu, S., Machida, M. N., Saigo, K., Tomida, K., Tomisaka, K. (2014),
ALMA Observations of Infalling Flows toward the Keplerian Disk around the Class I Protostar L1489 IRS (2014),
Astrophys. J., 793, 1.