Fascinating, Chris! Thanks!Chris Peterson wrote: ↑Fri Oct 06, 2023 12:47 am Evolution of a Supernova
Two images of SN 2023ixf in M101. The first is within a few days of peak intensity; the second from yesterday. 134 days of cooling off, from a hot, bright source to a cool, orange remnant. Orange because it has cooled down, and maybe because of dust scattering from a possible shell around the supernova.
Details:
QSI 660 camera on 250mm RC, Astronomic RGB filters
2023-05-23 image: 130 minutes each RGB
2023-10-04 image: 42 minutes each RGB
Processed with PixInsight and Photoshop
_
To me it is interesting that in your picture, the supernova looks very slightly yellow-white when it was near peak brightness. Other images show it as being very slightly bluish at peak brightness, which seems more resonable to me.Wikipedia wrote:
When the luminosity of a Type II supernova is plotted over a period of time, it shows a characteristic rise to a peak brightness followed by a decline. These light curves have an average decay rate of 0.008 magnitudes per day; much lower than the decay rate for Type Ia supernovae.
Yeah, can't really trust the color in the first image. The SN is so bright that it saturates, and since blue is brightest, it saturates first, which pushes the color away from blue. It might be an interesting exercise to figure out a way to keep both the color and the intensity in alignment with the rest of the image. That said, looking at the raw linear data, I can calculate the scaled RGB values as 147, 175, 255 = ███.Ann wrote: ↑Fri Oct 06, 2023 5:18 amFascinating, Chris! Thanks!Chris Peterson wrote: ↑Fri Oct 06, 2023 12:47 am Evolution of a Supernova
Two images of SN 2023ixf in M101. The first is within a few days of peak intensity; the second from yesterday. 134 days of cooling off, from a hot, bright source to a cool, orange remnant. Orange because it has cooled down, and maybe because of dust scattering from a possible shell around the supernova.
Details:
QSI 660 camera on 250mm RC, Astronomic RGB filters
2023-05-23 image: 130 minutes each RGB
2023-10-04 image: 42 minutes each RGB
Processed with PixInsight and Photoshop
_
It's interesting that the supernova is still bright enough to be still very clearly visible after more than six months. Of course, SN 2023ixf was a type SN II-L supernova, and they fade slowly:
To me it is interesting that in your picture, the supernova looks very slightly yellow-white when it was near peak brightness. Other images show it as being very slightly bluish at peak brightness, which seems more resonable to me.Wikipedia wrote:
When the luminosity of a Type II supernova is plotted over a period of time, it shows a characteristic rise to a peak brightness followed by a decline. These light curves have an average decay rate of 0.008 magnitudes per day; much lower than the decay rate for Type Ia supernovae.
It is a well-established fact that supernovas grow progressively redder as they fade, so the orange color in the second picture seems spot on.
Ann
Fascinating comparaison, I've been waiting to see this! Is there any clue in that remnant indicating whether we have a neutron star or a black hole?Chris Peterson wrote: ↑Fri Oct 06, 2023 12:47 am Evolution of a Supernova
Two images of SN 2023ixf in M101. The first is within a few days of peak intensity; the second from yesterday. 134 days of cooling off, from a hot, bright source to a cool, orange remnant. Orange because it has cooled down, and maybe because of dust scattering from a possible shell around the supernova.
Details:
QSI 660 camera on 250mm RC, Astronomic RGB filters
2023-05-23 image: 130 minutes each RGB
2023-10-04 image: 42 minutes each RGB
Processed with PixInsight and Photoshop
_
comp2_2k_a.jpg
Progenitor mass is estimated at 12-15 M⊙, so I think it could go either way. Haven't seen anything pointing solidly to either yet.Chris Alex wrote: ↑Fri Oct 06, 2023 4:13 pmFascinating comparaison, I've been waiting to see this! Is there any clue in that remnant indicating whether we have a neutron star or a black hole?Chris Peterson wrote: ↑Fri Oct 06, 2023 12:47 am Evolution of a Supernova
Two images of SN 2023ixf in M101. The first is within a few days of peak intensity; the second from yesterday. 134 days of cooling off, from a hot, bright source to a cool, orange remnant. Orange because it has cooled down, and maybe because of dust scattering from a possible shell around the supernova.
Details:
QSI 660 camera on 250mm RC, Astronomic RGB filters
2023-05-23 image: 130 minutes each RGB
2023-10-04 image: 42 minutes each RGB
Processed with PixInsight and Photoshop
_
comp2_2k_a.jpg
Interesting to know that a concentrated intensely bright bluish light source can look yellow-white precisely because it is so blue.Chris Peterson wrote: ↑Fri Oct 06, 2023 3:05 pmYeah, can't really trust the color in the first image. The SN is so bright that it saturates, and since blue is brightest, it saturates first, which pushes the color away from blue. It might be an interesting exercise to figure out a way to keep both the color and the intensity in alignment with the rest of the image. That said, looking at the raw linear data, I can calculate the scaled RGB values as 147, 175, 255 = ███.Ann wrote: ↑Fri Oct 06, 2023 5:18 amFascinating, Chris! Thanks!Chris Peterson wrote: ↑Fri Oct 06, 2023 12:47 am Evolution of a Supernova
Two images of SN 2023ixf in M101. The first is within a few days of peak intensity; the second from yesterday. 134 days of cooling off, from a hot, bright source to a cool, orange remnant. Orange because it has cooled down, and maybe because of dust scattering from a possible shell around the supernova.
Details:
QSI 660 camera on 250mm RC, Astronomic RGB filters
2023-05-23 image: 130 minutes each RGB
2023-10-04 image: 42 minutes each RGB
Processed with PixInsight and Photoshop
_
It's interesting that the supernova is still bright enough to be still very clearly visible after more than six months. Of course, SN 2023ixf was a type SN II-L supernova, and they fade slowly:
To me it is interesting that in your picture, the supernova looks very slightly yellow-white when it was near peak brightness. Other images show it as being very slightly bluish at peak brightness, which seems more resonable to me.Wikipedia wrote:
When the luminosity of a Type II supernova is plotted over a period of time, it shows a characteristic rise to a peak brightness followed by a decline. These light curves have an average decay rate of 0.008 magnitudes per day; much lower than the decay rate for Type Ia supernovae.
It is a well-established fact that supernovas grow progressively redder as they fade, so the orange color in the second picture seems spot on.
Ann
(Actually, type II-L supernovas fade fairly quickly; it is type II-P supernovas that persist longer. But this SN exhibited a short plateau phase, so its classification is a bit uncertain. I've seen it described in papers as a "hybrid II-P/II-L supernova".)
by mark h, on Flickr
by mark h, on Flickr
by mark h, on Flickr
Soap Bubble Nebula - 202309 starless by Massimo Marchini, su Flickr
Soap Bubble Nebula - 202309 HOO by Massimo Marchini, su Flickr
IC1340 by Astro Divers, su Flickr
Sunset at the South Pole by Tom Glenn, on Flickr
