The Zwicky Transient Facility Census of the Local Universe. I. Systematic Search for Calcium-rich Gap Transients Reveals Three Related Spectroscopic Subclasses
- De, K.
- Kasliwal, M.M.
- Tzanidakis, A.
- Fremling, U.C.
- Adams, S.
- Aloisi, R.
- Andreoni, I.
- Bagdasaryan, A.
- Bellm, E.C.
- Bildsten, L.
- Cannella, C.
- Cook, D.O.
- Delacroix, A.
- Drake, A.
- Duev, D.
- Dugas, A.
- Frederick, S.
- Gal-Yam, A.
- Goldstein, D.
- Golkhou, V.Z.
- Graham, M.J.
- Hale, D.
- Hankins, M.
- Helou, G.
- Ho, A.Y.Q.
- Irani, I.
- Jencson, J.E.
- Kaplan, D.L.
- Kaye, S.
- Kulkarni, S.R.
- Kupfer, T.
- Laher, R.R.
- Leadbeater, R.
- Lunnan, R.
- Masci, F.J.
- Miller, A.A.
- Neill, J.D.
- Ofek, E.O.
- Perley, D.A.
- Polin, A.
- Prince, T.A.
- Quataert, E.
- Reiley, D.
- Riddle, R.L.
- Rusholme, B.
- Sharma, Y.
- Shupe, D.L.
- Sollerman, J.
- Tartaglia, L.
- Walters, R.
- Yan, L.
- Yao, Y.
DOIAbstract
Using the Zwicky Transient Facility alert stream, we are conducting a large spectroscopic campaign to construct a complete, volume-limited sample of transients brighter than 20 mag, and coincident within 100″ of galaxies in the Census of the Local Universe catalog. We describe the experiment design and spectroscopic completeness from the first 16 months of operations, which have classified 754 supernovae. We present results from a systematic search for calcium-rich gap transients in the sample of 22 low-luminosity (peak absolute magnitude M >-17), hydrogen-poor events found in the experiment. We report the detection of eight new events, and constrain their volumetric rate to ⪆15% ± 5% of the SN Ia rate. Combining this sample with 10 previou...
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