Ultra wide-field UV transient exploration satellite Hibari
2Mechanica Engineering, Tokyo Institute of Technology, Meguro, Tokyo, Japan
3Micro Device Laboratory, Jet Propulsion Laboratory, Pasadena, California, USA
4Astronomy, California Institute of Technology, Pasadena, California, USA
5Physics, Konan University, Kobe, Hyogo, Japan
6Astronomy, Tohoku University, Sendai, Miyagi, Japan
7Astronomy, University of Tokyo, Mitaka, Tokyo, Japan
8Kali Institute for Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Chiba, Japan
9Mitaka Office, Genesia Corporation, Mitaka, Tokyo, Japan
Hibari is a 6U CubeSat mission which explores transients in NUV (230–280nm). Our primary science goal is to detect the NUV counter part of gravitational wave sources. To cover the large error region of LIGO/Virgo, Hibari has an ultra wide Field ~100 deg² telescope coupled with a delta-doped BI CMOS sensitized to UV band. The limiting magnitude is 20 mag(AB) for 30 min exposure. When no major Gravitational Wave event is happening, Hibari conducts a NUV transient survey. It aims to discover a few supernovae events within 100 Mpc per year. The potential targets are the early rise in NUV of shock break out, tidal disruption event (TDE), SuperLuminous Super- Nova (SLSN), and Type Ia supernovae. The basic survey strategy is to sweep 400 deg² (4 pointings) sky per orbit. Each pointing has 5 min exposure which leads to 19th magnitude (AB) depth (5σ) in NUV. One field (400 deg2) is monitored for 3 weeks and move on to the next field. We expect to monitor 17 fields per year which corresponds to 6800 deg². In this presentation the mission concept and the development status are reported.
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