Mickael on PSF modeling:

• Mat S, Joel, Ana, Ariel, Bastien, Benjamin, Jacco, Jakob, Julien, Martin, Mattia, Maxime, Melissa, Mickael, Philippe, Simeon, Suhail, Valery, Young-Lo

• Good week last week: ~30 Ia's. Lots discovered early: get a spectrum at peak?
• Would be great to have more TNS interaction to get public classifications.
• Hyper-gal is performing great: getting early classifications.
• ZTF21acyroke: classified as Ia; late type brightening; is actually Ic?
  • This is followed by a conversation of HD contamination. Are things classified too easily?

• The numbers: 761 SNe in Y1 (after removing poor subtractions). 304 with a spec-z (with T-max requirement). Cut bring this down to 204.
• Median z = (all:0.067, specz=0.056); existing lowz=0.03
• The x1 distribution matches existing low-z; the c-distribution is redder
• The mass distribution sees a low mass tail
• Updating the text / order of the paper: should be done by the end of the week

• What's the minimum we require to get to a Y1 cosmology release?
• ZTF cosmology release this autumn?
  • Need an uncertainty on the current photometry pipeline; not the future one?
  • What are the missing pieces? Most can be done in the IPAC sandbox
    • Need to understand the quality of the subtractions: inject fakes. Does this still exist?!
    • Update the calibration. It's currently biased. There's a pixel dependent offset. Apply the models from Drake et al to the dataset.
    • Need to look at i-band photometry. Not currently scrutinised. Apply fringe corrections; recalibrate (Masci et al)
  • Need a volunteer!

• The transient light-curves are off by ~5%
  • The correction is also time-dependent!
• This is caused by poor modelling of the PSF
• Update to ZIFF == PIFF for ZTF Running on CC.
  • The model works: we're down to a 0.5% scatter! (0.1 in r-band).
  • Next up Scene Modelling Photometry!

• Let's do this on slack!

• Let's do this next week!

ZTF Ia Phone-con: 2021-Mar-24

Meeting Agenda:

1. SNe of the week [Joel J]

2. The ZTF Y1 Sample: Final Plots [Suhail D]

3. Calibration report from DR [Jakob N]

4. PSF modelling update [Mickael R]

5. ZTF Public Newsletter [the group]

6. Measuring f sigma_8 [the group]

7. AOB / Close

-

Participants ():

• Mickael R, Mat S, Young-Lo K, Martin B (Lyon), Joel J, Ariel G, Suhail D, Mattia B, Ana S-C (Stockholm), Maxime D (Trinity), Melissa A, Philippe R, Manu G (Cleremont), Jakob N, Nicolas M, Simeon R, Valery B (Berlin), Nicolas R (Paris), Bastien C, Ben R, Julian B (Marseille), Eleni (!)

Notes:

Transients of the Week:

• It snowed last week.

Suhail on ZTF Y1:

Jakob on Calibration:

Mickael of PSF modeling:

Everyone on the newsletter:

Everyone on f sigma_8:

Closing Remarks:

• Sign up for a talk!