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I’ve added last night’s data (2/3 June) – see attached graph.
B-V = +0.26
Cheers
Ian.Attachments:
Morning!
Here’s my updated mag. graph with last night’s results.
B-V now +0.28Cheers
Ian.Attachments:
Here is a low resolution spectrum for the night 3/4 June. The continuum continues to cool and now matches a black body temperature of 9000K or an F0v star ((B-V) = 0.29.) The features are still weak with a very broad H alpha component with some structure evident at higher resolution. The higher Balmer lines are increasing in absorption blue shifted by ~8000 km/s
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Hi all,
Here is my updated mag graph from last night.
B-V = +0.295
Ian.
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Hello Ian,
Thanks for your excellent imaging and analysis of the supernova. I was wondering, how you manage to get so much data, my skies are quite cloudy and even quite windy.
Also how do you find the M101 so accurately, which software and platesolving software do you use ?Many thanks.
KwongThanks for your excellent imaging and analysis of the supernova. I was wondering, how you manage to get so much data, my skies are quite cloudy and even quite windy.
Also how do you find the M101 so accurately, which software and platesolving software do you use ?Hi Kwong,
Well, I have to say that I cannot remember a clear spell like the one we are having here in the UK at the moment! I don’t want to jinx it but it has been clear almost every night for weeks! I also have a remote observatory in Spain but the weather there has been terrible for weeks!
I acquire my images using software called Sequence Generator Pro. This does all of the scheduling for my imaging runs and I use PlateSolve2 or ASTAP for my platesolving:
https://www.hnsky.org/astap.htm
https://planewave.com/download/platesolve2/Cheers
IanGood morning,
Attached is my updated graph up to last night (8/9 June).
The B-V settled at +0.29
Cheers
Ian.Attachments:
The spectrum is now showing increasing features more typical of type II supernovae (Broad P Cygni Balmer lines)
Here is an example match in SNID to SN1980K 9 days past maximumCheers
RobinHi all,
Here’s my updated magnitude plot as of last night (12/13 June).
Cheers
Ian.Attachments:
A continuation of the animation of the spectrum. Part 2 covers 2023-05-27 to 2023-06-13 and shows the transition from an almost featureless spectrum to one showing more typical broad P Cygni Balmer lines
https://britastro.org/observations/observation.php?id=20230614_144855_b767104d96087a30Cheers
RobinA continuation of the animation of the spectrum. Part 2 covers 2023-05-27 to 2023-06-13 and shows the transition from an almost featureless spectrum to one showing more typical broad P Cygni Balmer lines
Superb!
I have attached my updated photometry graph with new data from both observatories last night (14/15 June).
Ian.
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Due to cloudy skies I have only managed six observations- the one I made last night is included on the plot. Although it’s only six points it is enough to see the basic type 2 supernova light curve.
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It’s been a few days since I posted an update on the RVB photometry of supernova SN 2023ixf in M101. I’ve been away on holiday for a few days and haven’t been able to process my observations. Here’s my updated graph which still shows a gradual decline in magnitude and a widening B-V value. My data covers nearly 40 days so far…
I was able to control my system at Pixel Skies Astro with my phone whilst I was in a boat in the wilds of the Norfolk Broads!Ian.
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There is a charming article about the discoverer of SN2023ixf in the journal Science:
https://www.science.org/content/article/amateur-astronomer-may-worlds-top-supernova-hunter
Hi all,
It’s been quite a few days since my last update but I have been manfully soldiering on measuring mags with the 3 RBV filters and I’ve barely missed a night!
I was talking to Robin Leadbeater at the excellent BAA Comet Section Meeting yesterday whether he thought that SN 2023ixf was a Type II-L or Type II-P. We both agreed that, since there has been no sign of a plateau to-date, it must be a Type II-L. However, now I’ve added last night’s data all three colours seem to be showing the beginnings of a sharp bend to a flat line (see attached graph – look at the last 2 square points on each line).
I’d be interested in any comments. Maybe the next couple of nights will tell!
Best Regards
Ian.Attachments:
Hi all,
With regard to may last post. New data from last night reveals that the slow decline continues!
Ian.
I see from the light curve the slow steady decline (~2 magnitudes in V over 70 days) has come to an end and the brightness is now dropping rapidly (~1.5 magnitudes in 12 days) This behaviour is similar to that seen in type II-P supernova following the plateau period so SN 2023ixf may have characteristics of both type II-L and II-P, similar to supernova like 2013by discussed in this paper for example
https://arxiv.org/abs/1501.06491v2Cheers
RobinI see from the light curve the slow steady decline (~2 magnitudes in V over 70 days) has come to an end and the brightness is now dropping rapidly (~1.5 magnitudes in 12 days)
Hi Robin,
Yes, and it’s turned back up again! See attached graph as of last night’s data…
Cheers
Ian.Attachments:
Ian, I am tremendously impressed by your work following this supernova.
In addition, I think we can make your “It’s turned back up again!” statement a little more quantitative. The rate of change over time of brightness (mathematical jargon term first time derivative of brightness) for all three colours is negative, and has been since about day 18. The rate of change of the rate of change over time of brightness (mathematical jargon term second time derivative) is what has changed sign in the last few days.
It would not be difficult to plot these quantities, but to do so accurately would require your data, rather than my guessing the values with a printed graph and measuring calipers.
Jane Clark
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