ZTF Ia Phone-con: 2021-Oct-20

Meeting Agenda:

1. SNe of the week [Joel J]

2. ZTF-DR2 [Mat S]

4. AOB / Close

-

Participants (12):

• Mat S, Joel J, Jakob N, Ariel G, Alice T, Melissa A, Remy J, Young-Lo K, Estelle R, Kate M, Suhail D, Georgios D

Transients of the Week:

• ZTF20abmarcv: two SNeIa at the same location. The key is what shape is it going to be.
  • As an fyi, we now have 145 siblings (not all ZTF-ZTF)
  • The aim is to NOT this next week
• ZTF21acdmwae: the recent SuperCH.
  • Data is being collected by Caltech. Lots of early time, NIR and SWIFT data has been collected.
• ZTF21acenkuf: Very dusty (~1 mag), in the middle of a host. Has maybe high Rv (the fit to existing photometry is Rv=4).
  • Has U-band; NIR data on this would help a lot.
  • Spectroscopy is needed to determine the subtype: LT/Sprat?
• ZTF21achxlkq: caught early (~-15 days). Shows strong Ca absorption.
  • Triggered on SWIFT; in the LT and LCO queue.
  • Also primed for Suhail's NIR proposal (TIRCAM on the 3.6m in India: https://www.tifr.res.in/~daa/tircam2/TIRCAM2-TIFR-NIR-Imager-II.pdf).
• ZTF19aamggua: old, but is this a Ia or Ic or fast decliner?

Papers + Admin:

• Suhail's paper has been accepted as has Rahul's.
• Alice Townsend is new: she's working with Jakob in Berlin.
• Remy Joseph is joining the group in Stockholm: looking for lensed SN.
• Also coming soon: 'volunteers'! To avoid Joel, Mat and Mickael randomly emailing people, let's transition to a google sheet.
  • We'll circulate this week: please sign up to talk about what you're up to.
  • The aim is to keep things informal: bring a plot.
  • Sign up! (before we ask you to!)

ZTF-DR2:

• The FP light-curves are now available in the GitHub. They are reformatted to be nice :).
  • Fits are being donw in SALT2 (Mat) and SNooPy (Joel) to help differentiate between sub-types
  • This of course means that we can look at the odd-balls / photometric comparison:
    • ZTF19aamggua. Is this a Ia or Ib or a weirdo (02cx?)?
    • ZTF20aazpnxl: No secondary-max?
    • ZTF20aaupoiv: Late time g-band excess (CSM?)
    • ZTF20abjbiqf: Early excess + limited secondary max
• How should we do this?
  • Let's store the information somewhere. Fritz or on the webapp? Fritz is impossible to search.
  • Let's all share the weird'ness: highlight them to someone.
• The FP light-curves are also 'curious' at times: some shifts, bumps and drop-outs.
  • Jakob: There are some flags at IPAC that we don't have. The IPAC light-curves take care of this.
    • Mat, can we find this information somewhere?
  • What's going on, and why?
    • Are their different templates for different areas of the sky?
    • There are also some late-time excesses that cannot be explained.
    • And there are a bunch where the i-band is simply off.
• Which papers are we going to write?
  • How are we not going to step on each other's toes.
  • Let's make sure that we pay attention to the weirdo's and don't release all of our data at once.
• Kate: which photometry shall we use? FPbot or IPAC or Adam?:
  • Jakob: we need a 'ground-truth'.
  • Mat: let's plot the various FP measurements together and look for subtle trends.
  • Ariel: there are cases where the SN is at different positions in different filters: this is going to cause problems.
  • Jakob: what should we publish: should it just be an analysis schema?
  • Kate: let's all collate this information in one place:
    • https://docs.google.com/document/d/18zeSINTQqyL5lwLOSCISZ5mjg3i0aAZW2w5mmr9CT8o/edit?usp=sharing
  • Suhail: would all of the pipelines being installed in one place be useful:
    • Joel: yes, but they all suffer from the same problems.
  • Summary: let's go through photometry together next week.

Closing remarks:

• Next week: photometry discussions, general updates and maybe some science :).