ZTF Ia Phone-con: 2021-May-05

Meeting Agenda:

1. SNe of the week [Joel J]

2. How are we going to measure photometry [Mickael R]

3. AOB / Close

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Participants (14):

• Mat, Estelle, Jakob, Joel, Joel, Martin, Maxime C, Maxime D, Mattia, Melissa, Mickael, Suhail, Philippe, Valery, Young-Lo

Notes:

Transients of the Week:

• Table sorting is still slow
• ZTF21aarguvb: pre-detection bump? Not real.
• ZTF21aaxwytv: pre-detection excess? AGN?
• ZTF21aaxwytv: early, fast rising.
• ZTF21aaxwnlr: early; redenned.
• ZTF21aavsbkt: in interacting galaxy.
• ZTF21aaxuywf: pretty :). Could do with another spectrum. Not a convincing SNIFS classification.
• Maxime: getting maximum light spectra of all Ia's within 100Mpc.

• What are we going to use for photometry for our next data release?
• The current pipeline (Suhail) uses ZUDS.
  • This makes individual references (swarp) and then HOTPANTS for subtraction.
• We want to update parts of this:
  • HOTPANTS -> ZOGY as this is used in LSST.
    • There are examples for Meerlicht
  • + interface PSF pipeline with it: ZIFF
    • There is now a working version of this.
    • Critical as this isn't corrected now.
  • But we probably keep ZUDS for making references.
• So we need to incorporate ZUDS references with ZOGY and then combine ZOGY with ZIFF.
• (Scene-modelling is a longer term problem. End of this year probably).
• Questions:
  • Suhail: should we go to HOTPANTS? DES + PS1 use this.
    • Consensus: no: the overall normalisation will fall out.
  • How are we going to keep track of everything?
    • Answer: a database. postgres probably. This is a 2nd order problem
  • Should we use the IPAC sandbox:
    • This is great, but isn't going to allow us to run everything, so no ;).
• Miscellaneous:
  • There might be a student in Stockholm (Hiranya's) who can help in ZOGY+ZIFF
• The Plan:
  • The key is to extract the source code for making references from ZUDS (basically swarp) and format it for ZOGY.
    • Mickael + Suhail to get together next week for this step
  • After that, we'll see. Small steps easily go to big steps. Volunteers welcome.

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