• Mickael R, Mat S, Jeremy L, Martin B (Lyon), Joel J, Ariel G, Suhail D, Mattia B, Ana S-C (Stockholm), Jakob N, Valery B, Simeon R (Berlin), Kate M, Jacco T (Trinity), Melissa A, Philippe R (Cleremont), Benjamin R, Bastien C, Julian B (Marseille)

• ZTF21aambvzd: highly redenned nearby Ia.
• ZTF21aamsiqk: Ia, caught early. Close to galactic plane (Ag=3). Ideal to test galactic extinction maps + R_V along this line-of-sight.
  • This is at max: target this for NIR follow-up.
• + a couple of other ambiguous classifications caused by the moon. Someone needs to look at this.

• Hyperspectral modelling in SEDm.
• Using photometric measurements from PS1 to infer a spectral host model. By convolving this with the SEDm resolution (and correcting for ADR effects), he can find the underlying host contamination in an SEDm spectrum.
  • Working at the pixel level for PS1. Resampling the images to SEDm spaxels. SED fitting (LePhare) to get a virtual IFU for every pixel with S/N>4 (otherwise there's nothing to fit ;)).
  • Precise astrometry in SEDm is an issue.
• It works! It could be better, but the SN is clearly visible when before it wasn't ;). It takes about 15 mins per object.
• Not so great for objects in the core of hosts: the SED model is important.
• Improvements to be made in the fitting assumptions, photometric catalogue, PSF modelling and time taken.
  • Could use existing spectra (SDSS) of the host to constrain the model.
• Can be used as a model for the host of the SNe: it's basically an IFU of the field.
• Code is available on GitHub.
• Help for implementing extensions would be appreciated

• This is a survey with DECAM to get griz measurements of low redshift SN.
  • The aim is to anchor the Hubble diagram with the same filter set as at high-z.
• Primary target feeder is likely to be ZTF/SEDm with probably ATLAS on the side.
• What shall we do about this? This is a bigger scale question than can be summed up in some notes.

• Sign up for a talk!

ZTF Ia Phone-con: 2021-Mar-03

Meeting Agenda:

1. SNe of the week [Joel J]

2. SEDm host modelling [Jeremy L]

3. The DEBASS survey [Mat S]

4. SNe in the NIR [Joel J]

5. AOB / Close

Participants ():

Notes:

Transients of the Week:

Jeremy on SEDm spectral modelling:

Mat on DEBASS:

Joel on SNeIa in the NIR:

Closing Remarks: