• Talk by Mark M on trying to estimate our efficiency of bump detection. Slides: ztf_telecon.pdf
• Combining simsurvey with models (normal Ia's; companion interaction; Ni-clumping; double detonations)

• Adam M, Ariel G, Bastien C, Benjamin R, Estelle R, Jakob N, Julian B, Manu G, Mark M, Mat S, Mattia B, Maxime C, Maxime D, Melissa A, Mickael R, Phillipe R, Suhail D, Valery B, Young-Lo K

• https://fritz.science/source/ZTF21aaabwzx: SNIa-CSM (similar to PTF11kx). Late time Halpha emission
• https://fritz.science/source/ZTF21aavodst: highly redenned SNIa (E(B-V)=1). We need independent i-band on this
• https://fritz.science/source/ZTF21aaylweu: faint, but exhibits an early time bump? Curious

• https://fritz.science/source/ZTF21aapehpx: z=0.04 SNIa.
• Exhibits an early time flux excess (aka a bump).
  • Combined with ATLAS there is a strong constraint on bump duration.
• The SN looks like a vanilla Ia around maximum light.
• But then shows a prominent r-band 2nd'ary max, not seen in a standard template.
• Key discussion: this isn't the first of these: ZTF19adcecwu was similar.
  • It looks (to Joel) like a clone of SN2019yvg.
  • See also ZTF20ablnjvp and ZTF20aavnnzx
  • Overall we have at least 5, and maybe 10
• Is there a relationship between early excess and secondary max excess?
  • These are culled from Maxime's dataset which only studies normal SNeIa.
  • Ariel / Mickael: could these be single-degenerate? Mark M: they don't have to be?
  • Mickael: do we know of any without a bump? Maxime: this should be a straight-forward search.
• Conclusion: the formation of a slack channel to search for these, and maybe write a paper on it. Maxime+Joel to coordinate.

Simulations of SNeIa bumps:

• Talk by Mark M on trying to estimate our efficiency of bump detection
• Combining simsurvey with models (normal Ia's; companion interaction; Ni-clumping; double detonations)
• Simulating 100,000 events with z<0.1 and seeing how many we detect.
• There is a correlation between bump strength, bump duration and brightness (shocking!)
• Across all redshift, the efficiency of seeing a bump within 1 day of explosion is 1%; 20% after 3 days; 50% after 6 days.
• At low-z (0.04) these efficiencies jump to 7% (1 day); 60% (3 days) and 90% (6days).
• The next step is to figure out the efficiency as a function of survey strategy: ZTF1 v ZTF2 v high-cadence v deep v ....
• Will also compare to Maxime's Y1 sample (updated to Y2+3?) to start thinking about rates / relative rates.

• 2-4 June 2021; 3 hours a day
• The WG will have one main presentation and one or two science talks
• The science talks could be the 'sibling pair' or 'early excess'
• Have a think and expect Mickael to volunteer you!

ZTF Ia Phone-con: 2021-May-12

Meeting Agenda:

1. SNe of the week [Joel J]

2. Simulations of bumps: How well can we find them? [Mark M]

3. ZTF21aapehpx: What is it and what shall we do with it! [Maxime D; Adam M; Joel J]

4. The ZTF Collaboration meeting: what shall we do for it? [the group]

5. AOB / Close

-

Participants (X):

Notes:

Transients of the Week:

Simulations of SNeIa bumps:

ZTF21aapehpx:

The Collaboration Meeting:

• 2-4 June 2021

Closing Remarks:

• Sign up for a talk!