Conceptual design of a wide-field near UV transient survey in a 6U CubeSat

A conceptual design of a wide-field near UV transient survey in a 6U CubeSat is presented. Ultraviolet is one of the frontier in the transient astronomy. To open up the discovery region, we are developing a 6U CubeSat for transient exploration. The possible targets will be supernova shock-breakouts, tidal disruption events, and the blue emission from NS-NS mergers in very early phase. If we only focused on nearby/bright sources, the required detection limit is around 20 mag (AB). To avoid the background and optical light, we chose a waveband of 230-280 nm. As an imaging detector, we employ a delta-doped back-illuminated CMOS. In addition to delta doping, the multi-layer coating directly deposited on the detector enables both a high in-band UV QE and the ultra-low optical rejection ratio. Taking into account these specifications, even an 8 cm telescope can achieve the detection limit of 20 magAB. The expected FoV is larger than 60 deg2 .

[1]  B. Metzger,et al.  Red or blue? A potential kilonova imprint of the delay until black hole formation following a neutron star merger , 2014, 1402.4803.

[2]  D. Frail,et al.  Illuminating gravitational waves: A concordant picture of photons from a neutron star merger , 2017, Science.

[3]  J. Prieto,et al.  Light curves of the neutron star merger GW170817/SSS17a: Implications for r-process nucleosynthesis , 2017, Science.

[4]  Yoichi Yatsu,et al.  Development of MITSuME—Multicolor imaging telescopes for survey and monstrous explosions , 2007 .

[5]  The Ligo Scientific Collaboration,et al.  GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral , 2017, 1710.05832.

[6]  Shouleh Nikzad,et al.  Metal-dielectric filters for solar-blind silicon ultraviolet detectors. , 2015, Applied optics.

[7]  B. Metzger,et al.  Neutron-powered precursors of kilonovae , 2014, 1409.0544.

[8]  J. Krzesinski,et al.  UVSat: a concept of an ultraviolet/optical photometric satellite , 2017, 1711.10366.

[9]  Kevin France,et al.  High-efficiency UV/optical/NIR detectors for large aperture telescopes and UV explorer missions: development of and field observations with delta-doped arrays , 2016, 1612.04734.

[10]  J. Murthy,et al.  Observations of the near and far ultraviolet background , 2009 .

[11]  J. Murthy,et al.  The diffuse ultraviolet foreground , 2013, 1307.5232.

[12]  E. Phinney,et al.  SCIENCE WITH A WIDE-FIELD UV TRANSIENT EXPLORER , 2013, 1303.6194.

[13]  T. Morokuma,et al.  Accepted for publication in the Astrophysical Journal Letters on 21 September 2009. Preprint typeset using L ATEX style emulateapj v. 08/22/09 PROPERTIES OF TYPE II PLATEAU SUPERNOVA SNLS-04D2DC: MULTICOLOR LIGHT CURVES OF SHOCK BREAKOUT , 2009 .

[14]  Mamoru Doi,et al.  Kilonova from post-merger ejecta as an optical and near-infrared counterpart of GW170817 , 2017, 1710.05850.

[15]  E. O. Ofek,et al.  SUPERNOVA PTF 09UJ: A POSSIBLE SHOCK BREAKOUT FROM A DENSE CIRCUMSTELLAR WIND , 2010, 1009.5378.

[16]  Masaya Koga,et al.  What We Learned from the Tokyo Tech 50 kg-satellite "TSUBAME" , 2017 .