The Zwicky Transient Facility Type Ia supernova survey: first data release and results

Type Ia supernovae (SNe~Ia) in the nearby Hubble flow are excellent distance indicators cosmology. The Zwicky Transient Facility (ZTF) has observed a large sample of from an untargeted, rolling survey, reaching $20.8, 20.6, 20.3$ mag $g$ $r$, and $i$-band, respectively. With FoV 47 sq.deg, ZTF discovered $>$ 3000 SNe~Ia little over 2.5 years. Here, we report on 761 spectroscopically classified first year operations (DR1). median redshift $\bar z =$ 0.057, nearly factor two higher than current low-$z$ sample. Our total 934 spectra, which 632 were obtained with robotic SEDm Palomar P60. We assess potential for precision cosmology 305 SNe redshifts host galaxy spectra. is already comparable size to entire combined literature anchor detection 13.5 days before maximum light, about 10 earlier literature. Furthermore, six our at $D_L < 80$ Mpc, distances can be JWST era, such that have calibrator same instrument. In duration ZTF-I, fifty obtain distances, key percent level scale measurements.