Gaststern von 1181 mit kosmischem Feuerwerk


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In China wurde nicht nur die berühmte Supernova von 1054 im Krebsnebel beobachtet und dokumentiert. Im Jahr 1181 wurde ein weiterer "Gaststern" im Sternbild der Cassiopeia beschrieben. Dort findet man jetzt den Supernova Remnant SN 1181. Zunächst wurde diesem Remnant der Pulsar 3C 58 zugeordnet, aber der ist wohl zu alt. Vor zwei Jahren wurde stattdessen ein extrem heißer Wolf-Rayet Stern ("Parker's star") mit dem umgebenden Pa 30 Nebel als wahrscheinliche Quelle benannt:

The Remnant and Origin of the Historical Supernova 1181 AD

Der Nebel Pa 30 wurde 2013 von Amateur Dana Patchick auf Archivaufnahmen vom Widefield Infrared Survey Explorer (WISE) entdeckt und zunächst als Kandidat in einer Liste Planetarischer Nebel aufgeführt. Im letzten Oktober wurden nun mit einem 2,4 m Teleskop am Kitt Peak Aufnahmen im [SII]-Schmalband gemacht, welche ein spektakuläres radial vom Zentrum ausstrahlendes Feuerwerk zeigen:

Discovery of an Exceptional Optical Nebulosity in the Suspected Galactic SN Iax Remnant Pa 30 Linked to the Historical Guest Star of 1181 CE

A newly recognized young Galactic SN remnant, Pa 30, centered on a hot central star has recently been proposed to be the result of a double-degenerate merger leading to a SN Iax event associated with the guest star of 1181 CE. Here we present deep optical [S II] λλ6716, 6731 images of Pa 30 which reveal an extraordinary and highly structured nebula 17" in diameter with dozens of long (5" − 20") radially aligned filaments with a convergence point near the hot central star

Weitere Untersuchungen zu Supernova SN 1181:

A Dynamical Model for IRAS 00500+6713: The Remnant of a Type Iax Supernova SN 1181 Hosting a Double Degenerate Merger Product WD J005311

IRAS 00500+6713 is a hypothesized remnant of a Type Iax supernova SN 1181. Multiwavelength observations have revealed its complicated morphology; a dusty infrared ring is sandwiched by the inner and outer X-ray nebulae. We analyze the archival X-ray data taken by XMM-Newton and Chandra X-ray Observatory to constrain the angular radius, mass, and metal abundance of the X-ray nebulae, and construct a theoretical model describing the dynamical evolution of IRAS 00500+6713, including the effects of the interaction between the SN ejecta and the intense wind enriched with carbon-burning ashes from the central white dwarf (WD) J005311. Our analysis supports that IRAS 00500+6713 is the remnant of SN Iax 1181 produced by a double degenerate merger of oxygen–neon and carbon–oxygen WDs, and WD J005311 is the surviving merger product.

Elusive temporary star described in historical documents recreated using new computer model

It is the year 1181 and in Japan the Genpei War (1180–85) has recently begun. It will lead to a shift in political power from aristocratic families to the new military-based shogunate, which will establish itself in the coastal city of Kamakura near modern-day Tokyo.

A record of this tumultuous period was compiled in a diary format in the Azuma Kagami. It chronicled not only people's lives and key events (with varying accuracy), but other daily observations, including the appearance of a new star.

"There are many accounts of this temporary guest star in historical records from Japan, China and Korea. At its peak, the star's brightness was comparable to Saturn's. It remained visible to the naked eye for about 180 days, until it gradually dimmed out of sight. The remnant of the SN 1181 explosion is now very old, so it is dark and difficult to find," explained lead author Takatoshi Ko, a doctoral student from the Department of Astronomy at the University of Tokyo.

Now, through computer modeling and observational analysis, researchers have recreated the structure of the remnant white dwarf, a rare occurrence, explaining its double shock formation. They also discovered that high-speed stellar winds may have started blowing from its surface within just the past 20–30 years.

Gruß, Peter


Remnant Pa 30 of SN 1181 - 2,4 Meter Kitt Peak image (Wikipedia)
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