• Mickael R, Mat S, Young-Lo K, Estelle R, Joel J, Maxime D, Dominique F, Bastien C, Julien B, Benjamin R, Melissa A, Philippe R, Suhail D, Nicolas R

• 360 Confirmed Ia's since June; that's 4 a night!
• Operations have been running smoothly
• We got SEDm time to get Ia's at peak (a couple per week): anything with an early spectrum will get targeted.
  • Targeting to be done manually. Tidy up the slack's
• We werw also awarded time to look for lensing candidates.

Meeting Times:

• Mickael will send a doodle poll to rearrange the times.
• There are no objections to moving the meetings by an hour, maybe more. They could also move days.
• The overall consensus is that it would be good to have Adam on the calls :).

ZTF21abiuvdk:

• This has daily cadence in g,r,i for the past two months + lots of spectra.
• It's in a calibrator galaxy
• Let's do a H0 proof-of-concept and prediction paper :). Other analyses are available: volunteer!
  • Suhail can help out: he has looked into uncertainties on H0 if we use the Y1 sample. Mickael (with Mat?) to pull together an outline.

Briday et al:

• This was on the arXiv yesterday (https://arxiv.org/abs/2109.02456)
• Read it!: it studies how the mass step varies as a function of stellar population tracer (mass, sfr, morphology):
  • tracers closely related to population age recover a large mass step
  • but critically, the low values of the mass step recovered from other tracers (morphology) can be entirely explained by 'tracer accuracy': how well a parameter measures population age
  • => population age can explain all measured values of the mass step
  • can we measure this for ZTF?

ZTF DR2:

• Mat and Mickael have been working on pulling ZTFDR2 together:
  • we have 3000 SNeIa's, probably 1500 of them are cosmology grade, and 1000 of which have a spec_z
• We could possibly look into proposing for the missing objects, but DESI has likely already got them.
• Mat's working on firming up the selection: more very soon.

RCF:

• The RCF phone-con's are every Tuesday at 7.30pm (Europe)
• Lots of discussions going on about classifications and light-curves
  • All spectra are being reclassified by 'a group of experts' using galaxy zoo. This is of use to the Ia group
  • The team also have FP light-curves (IPAC) for everything, and plan to make all of the data available in a data release.
    • What do we think of this? The light-curves are not scene-modelling, but they are useful for population studies, rates and host analyses
    • A group of us need to attend these meetings regularly

Papers in progress:

• Suhail: The Y1 paper is accepted: the last step is maknig the data public, talks with the journal are ongoing!
• Maxime: She's working on final corrections: the referee wanted a little bit more certainty in how the detection efficiencies are calculated.
  • Hopefully back with an updated version in a month or less :).

Closing Remarks:

• Back next week: volunteer for a talk, especially if you do calibration!
• France, also just gained approval for a large grant, so if you are interested in a post-doc, contact Nicolas / Mickael :).

ZTF Ia Phone-con: 2021-Sep-08

Meeting Agenda:

1. SNe of the week [Joel J]

2. Meeting times / format [The group]

3. ZTF21abiuvdk [Mickael R]

4. Briday et al [Mickael R]

5. Data release plans (RCF) [Mat S]

6. Science updates and plans [The group]

7. AOB / Close

-

Participants (XX):

Notes:

Transients of the Week:

P60 / SEDm proposals: