TCP J04291884+4354232 possible nova mag 10.2

[Forrest Sims]

To add to what David's plot shows, here is a plot over the same time period that show the evolution of Halpha in velocity.

novaper2020_20201204_250_Forrest Sims Halpha velocity plot.png (30.42 KiB) Viewed 6247 times

And for the same dataset note the appearance and interesting evolution of the Fe Multiplet (4924, 5018, 5169)Å.

novaper2020_20201204_250_Forrest Sims Fe multiplet 4Z evolution.png (54.6 KiB) Viewed 6247 times

Nice to have two Novae in the northern sky (the other being Nova Cas 2020 even though it is currently at about mag 13.6) to observe at the same time and both exhibiting visible changes at low resolution on a daily basis.

Woody

[James Ley]

Reassuringly, I seem to be getting the about the same results as people with far more skill than myself.

I think there is some evidence for Ca II K & H emission, consistent with earlier spectra in IR.

I think there is also some suggestion of [O I] at 630.0 nm and 636.4 nm, again consistent with the IR spectra.

When I compare the Balmer lines, it looks to me like the absorption has roughly the same velocity for all lines. The emission lines get wider (hotter environment) with shorter wavelength. Why is the absorption component similar?

novaperseus2020_20201206_209_Jim LeyBalmer.png (38.88 KiB) Viewed 6229 times

I'm trying to understand the different contributions to the emission lines from fluorescence (pumping by Lyman-ß etc. when the iron curtain is lifted) and recombination. The rise of Hα emission seems to me that it might include the former and the rise of Ca II H & K emission to be an indication of the latter. Any ideas?

[James Ley]

This paper https://arxiv.org/pdf/2010.07481.pdf
EARLY SPECTRAL EVOLUTION OF CLASSICAL NOVAE: CONSISTENT EVIDENCE FOR MULTIPLE DISTINCT OUTFLOWS

predicts a slow wind < 1000 km/s before maximum light and a fast wind > 1000 km/s after maximum light.

This might be what we are seeing (here is Hß)

novaperseus2020_20201206_209_Hbeta.png (24.51 KiB) Viewed 6218 times

Notice the blue absorption below 1000 km/s before 12/06 and the absorption around 1500 km/s observed on 12/06.

Has the nova reached its optical peak?

[Francois Teyssier]

Update of the lightcurve and ARAS spectra.

NovaPer2020_LC7.PNG (14.18 KiB) Viewed 6181 times

V723 Cas (Nova Cas 1995) for comparison

V723Cas.PNG (12.86 KiB) Viewed 6181 times

And a classical nova Nova Del 2013 (old friend of ARAS observers)

NovaDel2013.PNG (9.96 KiB) Viewed 6181 times

[umberto sollecchia]

Bonsoir à tous, placé une nouvelle contribution à l'observation de cette nova.
Umberto

novaper2020_20201206_881_Umberto Sollecchia.png (43.02 KiB) Viewed 6174 times

[Joan Guarro Flo]

Congratulazione Umberto !

Very nice spectra in the infrared.

Un abbraccio, Joan.

[James Ley]

Pas beaucoup de changement mais ça coule plus vite.

nper2020b_20201209_140_Jim Leybeta.png (18.77 KiB) Viewed 6105 times

[Forrest Sims]

Nice work Jim! I am seeing the same trend tonight in my spectra. I measured the V mag at 9.26. Here are my last two flux calibrated spectra.

Woody

[Francois Teyssier]

NovaPer2020_LC8.PNG (13.56 KiB) Viewed 5991 times

[umberto sollecchia]

Bonsoir à tous, voici le profil d'observation du 12-12-2020. Cette fois, moi aussi, comme Paolo Berardi, j'ai utilisé un filtre rouge pour éliminer la pollution de second ordre.
J'attache une comparaison entre le profil sans filtre et celui avec filtre où il est montré que l'ordre 2 dans l'IR pollue le spectre d'ordre 1.
Umberto.

noavper2020_20201212_843_Umberto Sollecchia.png (23.71 KiB) Viewed 5944 times

Comparison

noavper2020_20201212_843_ Comparazione _U. Sollecchia.png (47.99 KiB) Viewed 5944 times