ZTF Ia Phone-con: 2021-Dec-01

• This is a proof of concept atudy using a nearby ZTF SN: eventually the plan is to do it with a sample: with one sample across redshifts we can take out calibration issues.
• TRGB is an alternate way to measure distances in the local universe; it's independent of galaxy type, and does not suffer from metallicity / crowding issues.
• The base sample is anything less than 20Mpc (4 events). These are HST'able. There are 50 to 80Mpc: these are JWST'able.

• • Suhail has written a MCMC code to infer H0. The current uncertainty is 8%: it's dominated by the local measurements.
  • A draft ApJ letter is being written: want it submitted prior to the HST deadline (April 2022).
• A draft will be circulated this week. The value is blinded; will be unblinded prior to submission.