ZTF Ia Phone-con: 2021-Nov-03

Meeting Agenda:

1. SuperCH SNe [Georgios D]

2. DR2 Update [Mat S]

3. AOB / Close

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Participants (9):

• Mat S, Suhail D, Georgios D, Melissa A, Bastien C, Ariel G, Jacco T, Kate M, Ana S-C
• Apologies: Mickael R, Joel J

Transients of the Week:

• No Joel this week :(.

SuperCH SNe:

• 03fg-like. 2009dc and 2012dn are prominent examples
• These are overluminous, very blue SNeIa with no-secondary max.
• Weak intermediate-mass-elements (Carbon until peak)
• Working on ZTF21acdmwae. z=0.026
  • We have proprietary Caltech data which has a very early (-20) detection
  • Extinction isn't zero; the correction is being applied to get us to abs_mag, and is determined through the spectra
  • At early times it has a bump: starts blue, goes red. The colour is very different to 11fe.
  • The SN is also very blue in the UV: much brighter than 11fe. Basically no line-blanketing.
  • The spectrum exhibits plenty of Carbon: unburned material from the original WD?
    • Are there two components for Carbon? The fit is good, but is it real or over-fitting?
  • Looking at the early light-curve - there's an excess at -22 days?
  • Bolometric fitting gives 1.2-1.4Msolar (43.2ergs^-1)
  • Looking to compare to models that include interaction (https://hesma.h-its.org/doku.php?id=start)
    • These are all fixed to 1Msolar of Nickel, which is a lot.
    • Uli has left the field though....
  • There is NIR photometry that needs to be reduced. It's still being taken.
  • The aim is for a paper based upon the photometry in the next few months.

DR2 Updates:

• Mat has discovered that most of the flags recommended by IPAC are in the FPbot image files, but not in the output csv.
  • Is debating how to extract this information
  • Light-curve fits to all objects (including a baseline correction is implemented). Will be in the dropbox once pathological cases are sorted out
• Jacco has been looking at light-curve comparisions to BTS (Adam M). Prelimiary results show a scatter of 0.02 mag after a baseline correction
  • Adam M also introduced Mat to the 'cloudy' flag: this is the primary cut being used by BTS: it's implementable if we can get the information out of the images...

Closing remarks:

• Fill in the spreadsheet to volunteer....