SN 2024ggi a nearby type II supernova in NGC3621 (Dec -32 deg)

[Tom Love]

And there's much more going on now. Nice fat H lines, as you'd expect from Type II.

[Olivier GARDE]

Hello Tom,

a very good follow-up to this Sn!!!
We don't have very good weather in Chile right now (the 45-day bad weather period is underway..).

[Tom Love]

Thanks Olivier. Peter Velez and Hamish Barker also have some observations, so I think we may have pretty good coverage of this one. On this side of the Pacific we have been lucky with the El Nino weather this autumn.

If we can keep up observations as it fades we may be able to model the SN, both in terms of light curve and spectrum. Many Type IIP SN are analysed in the literature with 6 to 8 spectra over a 6 month or more duration. We should achieve much better data coverage than that level, I think.

[Robin Leadbeater]

How bright did it get at maximum? I am still able to follow SN 2023ixf into the nebular phase almost a year old now with the ALPY200 currently at mag 17.5
https://britastro.org/specdb/data_graph ... &multi=yes

Here is the latest fit using SNID

SN2023ixf_20240425_SNIDfit.png (51.73 KiB) Viewed 1689 times

[Tom Love]

I think just a little brighter than 12th magnitude at peak in V.

Fantastic to be able to follow ixf all the way to the nebular phase. We'll have to see how far we can get with this one.

[Tom Love]

Hamish Barker, Peter Velez and I are continuing to monitor SN2024ggi - it's coming along nicely.

The filled in bit where you would expect a P Cygni style absorption to the left of the H Alpha line is interesting. I'm going to try to get a spectrum with higher S/N to see if I can bring out a little more detail in this area.

This paper is helpful on interpreting H Alpha lines in Type II spectra. https://iopscience.iop.org/article/10.1 ... 2/L15/meta

[2SPOT]

Hello Tom,

Thanks for this useful article !!!!

We cannot do this target at the moment from our 2SPOT setup in low resolution because we are tracking other urgent targets with our eShel spectrograph.

[Tom Love]

I think we're getting decent coverage from Australasia, though I hope we can keep it up long enough as it fades.

Hamish also found this quite useful paper, with lots of comparisons of a a Type IIP with other examples and models. It's helpful for understanding the variety of features in both spectra and lightcurves.

https://ui.adsabs.harvard.edu/link_gate ... 4T/PUB_PDF

[Tom Love]

Back home after several weeks away, and SN2024ggi still seems pretty bright, though I haven't seen any recent photometry. It's getting low in the sky, though, and I suspect I won't be able to follow it much longer.

[Olivier GARDE]

Great spectrum Tom !!!!
and a challenge to make its spectrum when it's very low on the horizon.