Teruaki Enoto :Curriculum Vitae [Japanese] [photo] [GitHub]

X-ray observation of neutron stars to approach the fundamental physics

Affiliation / Contact Information:

Associate Professor,
Department of Astronomy, Graduate School of Science
and Hakubi Center, Kyoto University

Department of Astronomy, Faculty of Science
Build.4 Room 507,
Kitashirakawa-Oiwake-cho, Sakyo-ku,
Kyoto, 606-8502, Japan

Main Interests:

Observational Research for Physics of Neutron Stars

My main research interest is strongly-magnetized neutron stars, known as soft gamma repeaters (SGRs) and anomalous X-ray pulsars (AXPs). They are though to be magnetically-powered pulsars, and thus, collectively called magnetars. Mainly via high energy X-ray observation, I am challenging to verify they are indeed strongly-magnetized compact objects, to uncover the emission mechanism of these enigmatic objects and to understand their population and evoluion in our Galaxy. I am also interested in observational approach to dermine the euqation of state of neutron stars from astrophysical observations.

Next Generation X-ray Observatories

International collaboration is now indispensable to keep front-line space observations. I started my research career from the Japanese-US X-ray satellite "Suzaku". Within a few years, the ultra-high energy spectroscopy will be realized by the next gneration X-ray observatory, ASTRO-H, which I have contributed as a science working group member after two years contribution to the hardware at Stanford University. In addition, I am continuing to contribute to on-gowing projects, NICER (Neutron star Interior Composition Explorer) and X-ray polarimeter mission, PRAXyS, both from science or instrumental develpments.

High Energy Phenomena in Thunderclouds

Radiation monitors along the Japan sea sometimes recorded high energy gamma-rays when the strong winter thunder clouds passed over the detectors. We have pointed out that such gamma-rays are bremsstrahlung photons from relativistic electrons which are accelerated in the strong electric field of the winter thundercloud. We are developing new radiation monitors under a collaboration with RIKEN and The University of Tokyo to understand particle accelerations in the winter thundercloud.

Education and Appointments:

Papers (selected)

  • T. Enoto, M. Sasano, S. Yamada, T. Tamagawa, K. Makishima, K. Pottschmidt, D. Marcu, R. Corbet, F. Fuerst, and J. Wilms, “Spectral and Timing Nature of the Symbiotic X-ray Binary 4U 1954+319: The Slowest Rotating Neutron Star in an X-ray Binary System”, Astrophysical Journal, vol. 786, 127-143 (2014) [ADS]
  • K. Makishima, and T. Enoto, et. al., “Possible Evidence for Free Precession of a Strongly Magnetized Neutron Star in the Magnetar 4U 0142+61”, Physical Review Letter, Vol. 112, 171102 (2014) [ADS]
  • T. Enoto, K. Nakazawa, K. Makishima, N. Rea, K. Hurley, S. Shibata, “Broadband Study with Suzaku of the Magnetar Class”, Astrophysical Journal Letters, Institute of Physics, vol. 722(2) L162-167, (2010) [ADS]
  • T. Enoto, K. Nakazawa, K. Makishima, and Y. E. Nakagawa, et al., “Suzaku Discovery of a Hard X-ray Tail in the Persistent Spectra from the Magnetar 1E 1547.0-5408 during its 2009 Activity”, Publication of the Astronomical Society of Japan, vol.62(2), 475-485, 2010 [ADS]
  • T. Enoto, Y. E. Nakagawa, and K. Makishima, et al., “Suzaku Observation of the New Soft Gamma Repeater SGR 0501+4516 in Outburst”, Astrophyscial Journal Letters, vol.693(2), 122-126, 2009 [ADS]
  • H.Tsuchiya, T. Enoto, S.Yamada, T.Yuasa, and K.Makishima, et al., "Detection of high-energy gamma rays from winter thunder clouds", Physical Review Letters, American Physics Society, vol.99,165002 (2007) [ADS]
  • Other 27 papers (Total 33, First author 8, Second author 8)

Honors and Grant Received:

  • The 6th Young Scientist Award of the Physical Society of Japan, Cosmic-ray and Astrophysics, for “Broad-band Study with Suzaku of the Magnetar Class”, The Astrophysical Journal Letters, 722(2) 2010, L162-167, 2012 March 24
  • The 1st research encouragement prize from Department of Science, The University of Tokyo, for master thesis "Observational Research for the Particle Acceleration in the thunder cloud's electric field", 2007 March 22
  • Fermi Guest Investigator Proposal Grant (Cycle 4)
  • JSPS research fund, 2015-2016
  • JSPS SPD Fellow Grant, 2012-2014
  • JSPS DC1 Fellowship Grant (Research Fellowship for Young Scientist), 2007-2009

Invited Talks

Public Service

  • Referee for: Astrophysical Journal, Physical Review Letter, Physical Review D, Research in Astronomy and Astrophysics
  • Participant in Lindau Nobel Laureate Meeting (Physics, 2013)

Partcipating projects (X-ray observatories)

  • Suzaku (2005-): timing calibration, data analyses of neutron stars
  • GROWTH (2006-): development of gamma-ray detectors, observation and data analyses
  • SPRITE-SAT (Rising) (2009-): development of gamma-ray detectors
  • ASTRO-H (2015-?): ASIC acceptance test of the soft gamma-ray detector, editor of the ASTRO-H Cookbook, author of the ASTRO-H White paper
  • NICER (2016-?): development and calibration of X-ray concentrators, member of science working group
  • GEMS→PRAXyS (2020-?): calibration of detector, member of the PRAXyS proposal

photo by T.Yoshida