• Mat, Joel, Mickael, Ana, Ariel, Benjamin, Dominique, Estelle, Fabrice, Jakob, Julian, Martin, Mattia, Maxime C, Maxime D, Melissa, Philippe, Simeon, Suhail, Valery, Young-Lo

• Fritz functionality is broken
• It's been raining most of the week

• Two glSNeIa have been found to date. More should be there. More should be being found now.
  • PS1-10afx: z=1.39; lens=1.12 (magnification=30)
  • iPTF16geu: z=0.409; lens=0.216 (magnification=70)
  • Need to identify these things pre-peak: how?
• Is galaxy colour important?: the combined SED is very red. They are outliers in colour-colour space.
• For ZTF: the separation of SN to lens is <1" from the host; time delays are <10 days; median z=0.75; median lens=0.35
  • Predictions are for 1 Ia a year.
  • Plans are for follow-up with MUSE + HST (under review)
  • Resolved spectra to measure time-delays?
• Searching archival ZTF-I data in colour-colour space.
• Live search: looking in 7000 'known' lens systems + all candidates (could filter on nuclear?)
  • Working through a jupyter-notebook
  • 360 new sources today; 300 photo-z's; 100 spec-z's. 35 candidates after cuts.
• Spectroscopy is the problem. Candidates are going to be faint
• Ways to improve functionality:
  • Incorporate photo-z's in fritz.
    • At least a column that tells us where the redshift comes from!
    • We all care about this: lets add it as a request on github.
  • Incorporate new filter: reverse TDE.
  • The API is currently slow.
• Going to be an AMPEL run through at the phone-con tomorrow.

• Looking at optimising the redshift from SEDm. P60 data only.
• Two redshifts can come out of an IFU: SN (SNID: both from single and multiple spectra) + host.
• Aim is to get a redshift from all classifications.
• The key is the uncertainty on redshifts.
• Has implemented a python wrapper to fit SNID.
  • This visualises the results of SNID, and allows you to utilise all of the fitting parameters as inputs
• The derived redshift is degenerate with phase, due to the known age v velocity correlation
  • Alleviating this with light-curve information (awesome!)
  • Ariel: can you also use line-profiles to aid this (maybe?!)
• The plan is to combine the redshift from SNID with host information from SED (hyper-gal) to get multiple redshift estimates
  • Either one will inform the other or both will be determined simultaneously. Plan TBD
• Plenty more to come

ZTF Ia Phone-con: 2021-Apr-28

Meeting Agenda:

1. SNe of the week [Joel J]

2. How's it going with lensing [Joel J]

3. Estimating redshifts in SNID [Mickael R]

4. AOB / Close

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Participants (XX):

Notes:

Transients of the Week:

Lensing Update:

Redshift Estimation:

Closing Remarks:

• Sign up for a talk!