The Remnant and Origin of the Historical Supernova 1181 AD

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The Remnant and Origin of the Historical Supernova 1181 AD

Postby Pascal Le Du » Fri Sep 17, 2021 8:49 am

Bonjour(text in English below)

Juste pour partager avec vous, une publication vient de sortir dans "The Astrophysical Journal Letters" sur l'origine d'une des cinq supernovæ qui ont été observées dans notre Galaxie ce millénaire.
Cette supernova a été vue par des astronomes chinois et japonais en 1181. Selon les écrits, elle était aussi brillante que Saturne et est restée visible pendant environ six mois. Ces premiers observateurs ont indiqué une position approximative dans le ciel, mais aucun vestige n'a jamais été retrouvé. Ainsi, cette supernova est restée un mystère jusqu'à aujourd'hui...
La publication rapporte qu'une faible nébuleuse en expansion rapide entourant l'une des étoiles les plus chaudes connues à ce jour forme un duo qui est lié à l'événement cosmique de 1181. La nébuleuse appelée Pa30 (Fig.1) a en son centre, une étoile extrêmement chaude nommée "étoile de Parker". Il s'agit de l'étoile Wolf-Rayet la plus chaude connue à ce jour (200 000° Celsius). La position de l'étoile Pa30/Parker dans le ciel, correspond à celle des écrits historiques chinois et japonais sur "l'étoile invitée" (Fig. 2). La vitesse d'expansion de Pa 30 est extrêmement élevée, de l'ordre de 1 100 km/s. Son âge serait d'environ 1000 ans, ce qui correspond à l'âge de SN 1181 AD.
L'étoile Parker serait le résultat de la fusion de deux naines blanches, ce qui aurait produit un phénomène rare, une supernova de type Iax. Ce type de supernova n'est pas encore bien compris par la communauté scientifique mais le système galactique formé par Pa 30 et l'étoile Parker permettra certainement d'en savoir beaucoup plus dans le futur...
Cette publication a été déclenchée par une observation spectroscopique que j'ai faite en octobre 2018 depuis Porspoder en Bretagne. Le spectre de l'objet était vraiment atypique.
Sp2D_Pa30.jpg
Sp2D_Pa30.jpg (74.47 KiB) Viewed 4432 times

Sp1D_Pa30.jpg
Sp1D_Pa30.jpg (21.83 KiB) Viewed 4432 times

Après avoir vérifié la véracité de mon observation auprès de Thomas Petit (Olivier Garde et Christian Buil qui testait l'Uvex, n'avaient pas une météorologie favorable à l'époque), j'ai contacté le professeur Quentin Parker de l'Université de Hong Kong qui a immédiatement constitué une équipe pour collecter toutes les données sur cet objet extrêmement rare afin de rédiger une publication.
Cette publication est actuellement largement diffusée dans la presse scientifique.

Pour plus de détails : http://dx.doi.org/10.3847/2041-8213/ac2253

------------------------------------

Hello
Just to share with you, a publication has just come out in "The Astrophysical Journal Letters" on the origin of one of the five supernovae that have been observed in our Galaxy this millennium.
This supernova was seen by Chinese and Japanese astronomers in 1181. According to the writings, it was as bright as Saturn and remained visible for about six months. These early observers indicated an approximate position in the sky but no remnant was ever actually found. Thus, this supernova has remained a mystery until today...
The publication reports that a faint, rapidly expanding nebula surrounding one of the hottest stars known to date forms a duo that is linked to the cosmic event of 1181. The nebula called Pa30 (Fig.1) has in its center, an extremely hot star named "Parker's star". It is the hottest Wolf-Rayet star known to date (200 000° Celsius). The position of the star Pa30/Parker in the sky, corresponds to that of the historical Chinese and Japanese writings on the "guest star" (Fig. 2). The expansion speed of Pa 30 is extremely high, of the order of 1 100 km/s. Its age would be about 1000 years, which corresponds to the age of SN 1181 AD.
The Parker star would be the result of the fusion of two white dwarfs, which would have produced a rare phenomenon, a supernova of type Iax. This type of supernova is not yet well understood by the scientific community but the galactic system formed by Pa 30 and the Parker star will certainly allow to know much more in the future...

This publication was triggered by a spectroscopic observation I made in October 2018 from Porspoder in Britany. The spectrum of the object was really atypical. After verifying the veracity of my observation with another amateur astronomer domiciled in Prague, Thomas Petit, I contacted Professor Quentin Parker of the University of Hong Kong who immediately assembled a team to collect all the data on this extremely rare object in order to write a publication.
This publication is currently widely distributed in the scientific press.

For more details: http://dx.doi.org/10.3847/2041-8213/ac2253
Pascal Le Du
 
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Re: The Remnant and Origin of the Historical Supernova 1181

Postby JP Nougayrede » Fri Sep 17, 2021 9:22 am

Bravo Pascal, un beau papier pro qui a pour origine ton observation amateur :)
JP Nougayrede
 
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Re: The Remnant and Origin of the Historical Supernova 1181

Postby Olivier GARDE » Fri Sep 17, 2021 12:43 pm

Génial Pascal... Comme quoi faut toujours vérifier ses spectres... Et trouver ainsi un signal dans l'extrême bleu du spectre qui se révèle être du signal et pas du bruit....
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: The Remnant and Origin of the Historical Supernova 1181

Postby Robin Leadbeater » Fri Sep 17, 2021 1:03 pm

What a fascinating object! Very different from a traditional high mass WR star.
Reading the Gvaramadze reference it seems its final demise has just been delayed and we should see another bright transient event (A GRB?) from it in the next 10,000s of years when it finally collapses
https://arxiv.org/pdf/1904.00012.pdf
I wonder if it will end up as a neutron star or destroy itself in an thermonuclear explosion ?

Congratulations!
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
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Re: The Remnant and Origin of the Historical Supernova 1181

Postby Robin Leadbeater » Fri Sep 17, 2021 1:29 pm

Well placed at the moment too
https://airmass.org/chart/obsid:wright/ ... :67.500583
I am definitely going to have a look at this star.

Thanks Pascal!
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
Posts: 1862
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Re: The Remnant and Origin of the Historical Supernova 1181

Postby Pascal Le Du » Sat Sep 18, 2021 7:21 am

Yes Robin, this object is very special.
It is also a good target for the UVEX...
Did you shoot Pa30 last night?

Pascal
Pascal Le Du
 
Posts: 29
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Location: Porspoder, Brittany

Re: The Remnant and Origin of the Historical Supernova 1181

Postby Robin Leadbeater » Sat Sep 18, 2021 5:06 pm

Pascal Le Du wrote:Did you shoot Pa30 last night?


Not yet. Perhaps when the bright moon has gone. It is on my list but the weather forecast is not good at the moment. I only have the ALPY but perhaps I will also try at very low resolution with the ALPY 200 and see how far into the UV I can get.

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
Posts: 1862
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Re: The Remnant and Origin of the Historical Supernova 1181

Postby Robin Leadbeater » Mon Sep 20, 2021 9:55 pm

I tried it last night with the ALPY 600. The SNR is low because of the bright moonlight but the main features are there. The O VI line at 3811/3834 is very strong, particularly
after correcting for IS extinction.

Cheers
Robin

IRAS_00500+6713_20210919_957_Guider.png
IRAS_00500+6713_20210919_957_Guider.png (128.06 KiB) Viewed 4201 times


iras00500+6713_20210919_957_Leadbeater_dered.png
iras00500+6713_20210919_957_Leadbeater_dered.png (49.79 KiB) Viewed 4201 times
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
Posts: 1862
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Re: The Remnant and Origin of the Historical Supernova 1181

Postby Michel Verlinden » Wed Sep 29, 2021 9:19 pm

Pascal,
La chance sourit aux audacieux ! La quête de NP t'a conduit à une découverte inattendue et historique. Félicitations !
Michel Verlinden
 
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Re: The Remnant and Origin of the Historical Supernova 1181

Postby Olivier GARDE » Fri Dec 03, 2021 3:53 pm

Voici un article qui décrit la chronologie de la découverte de l'origine de cette supernovae :
https://www.shelyak.com/sn-1181-une-histoire-peu-commune/

Here's an article that describes the chronology of the discovery of the origin of Sn 1181 :
https://www.shelyak.com/sn-1181-une-histoire-peu-commune/?lang=en
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Olivier GARDE
 
Posts: 1199
Joined: Thu Sep 29, 2011 6:35 am
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