Kazhiro Sekiguchi

J-GLOBAL         Last updated: Dec 6, 2018 at 20:48
Kazhiro Sekiguchi
National Astronomical Observatory of Japan
Division of Optical and Infrared Astronomy

Published Papers

American Astronomical Society Meeting Abstracts      Jan 2018   [Refereed]
Type IIP supernovae (SNe IIP) exhibit the absorption lines of the Balmer series in their spectra and the plateau phases in the optical light curves. Their progenitors are widely thought to be the red supergiant star having the abundant hydrogen en...
The Astrophysical Journal      Mar 2017   [Refereed]
We present the early-phase spectra and the light curves of the broad-lined (BL) supernova (SN) 2016coi from t = 7 to 67 days after the estimated explosion date. This SN was initially reported as a BL Type SN Ic (SN Ic-BL). However, we found that s...
Publications of the Astronomical Society of Japan      Oct 2016   [Refereed]
We present extensively dense observations of the super-Chandrasekhar supernova (SC SN) candidate SN 2012dn from -11 to +140 d after the date of its B-band maximum in the optical and near-infrared (NIR) wavelengths conducted through the OISTER ToO ...
The Astrophysical Journal      May 2016   [Refereed]
We present simultaneous optical and near-infrared (NIR) polarimetric results for the black hole binary V404 Cyg spanning the duration of its seven-day-long optically brightest phase of its 2015 June outburst. The simultaneous R- and K s </SU...
The Astrophysical Journal      May 2016   [Refereed]
We study the extent to which very bright (-23.0\lt {M}{UV}\lt -21.75) Lyman-break-selected galaxies at redshifts z≃ 7 display detectable Lyα emission. To explore this issue, we obtained follow-up optical spectroscopy of 9 z≃ 7 galaxies ...