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Post Info TOPIC: Kepler's supernova remnant
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Supernova 1604
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Title: Supernova 1604, Kepler's supernova, and its remnant
Author: Jacco Vink (Anton Pannekoek Institute/GRAPPA, University of Amsterdam)

Supernova 1604 is the last Galactic supernova for which historical records exist. Johannes Kepler's name is attached to it, as he published a detailed account of the observations made by himself and European colleagues. Supernova 1604 was very likely a Type Ia supernova, which exploded 350 pc to 750 pc above the Galactic plane. Its supernova remnant, known as Kepler's supernova remnant, shows clear evidence for interaction with nitrogen-rich material in the north/northwest part of the remnant, which, given the height above the Galactic plane, must find its origin in mass loss from the supernova progenitor system. The combination of a Type Ia supernova and the presence of circumstellar material makes Kepler's supernova remnant a unique object to study the origin of Type Ia supernovae. The evidence suggests that the progenitor binary system of supernova 1604 consisted of a carbon- oxygen white dwarf and an evolved companion star, which most likely was in the (post) asymptotic giant branch of its evolution. A problem with this scenario is that the companion star must have survived the explosion, but no trace of its existence has yet been found, despite a deep search.
1 Introduction; 2 The supernova remnant, its distance and multiwavelength properties; 2.1 Position, distance estimates and SN1604 as a runaway system; 2.2 X-ray imaging spectroscopy and SN1604 as a Type Ia supernova 2.3 The circumstellar medium as studied in the optical and infrared; 3 The dynamics of Kepler's SNR; 3.1 Velocity measurements; 3.2 Hydrodynamical simulations; 4 The progenitor system of SN 1604; 4.1 Elevated circumstellar nitrogen abundances, silicates and a single degenerate scenario for SN1604; 4.2 Problems with a single degenerate Type Ia scenario for SN 1604; 4.3 Was SN 1604 a core-degenerate Type Ia explosion?; 4.4 What can we learn from the historical light curve of SN 1604? ; 5 Conclusions

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Blobrana


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RE: Kepler's supernova remnant
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First Indian record of supernova found in Kashmir

With the help of a mural at the mosque of Madani in Srinagar, researchers claim to have found the "first firm record" of a supernova event, which occurred in the Indian subcontinent centuries ago.
Researchers from the Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research (TIFR) and the University of Kashmir said the mural, depicted on a door arch in the mosque, shows the supernova as a dragon-head on the tail of the Sagittarius constellation.
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Blobrana


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White-dwarf star, blown apart in 1604, now reveals new secrets

New detections of X-rays from a white-dwarf star that exploded as a supernova in 1604 will help astronomers to better understand the important class of stars known as "Ia supernovae," which are used to probe the distant universe.
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Blobrana


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Kepler's Supernova Remnant: Famous Supernova Reveals Clues About Crucial Cosmic Distance Markers

As reported in our press release, a new study has used Chandra to identify what triggered this explosion. It had already been shown that the type of explosion was a so-called Type Ia supernova, the thermonuclear explosion of a white dwarf star. These supernovas are important cosmic distance markers for tracking the accelerated expansion of the Universe.
However, there is an ongoing controversy about Type Ia supernovas. Are they caused by a white dwarf pulling so much material from a companion star that it becomes unstable and explodes? Or do they result from the merger of two white dwarfs?
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Blobrana


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Title: No evidence for an early seventeenth-century Indian sighting of Keplers supernova (SN1604)
Authors: Robert H. van Gent

In a recent paper Sule et al. (Astronomical Notes, vol. 332 (2011), 655) argued that an early 17th-century Indian mural of the constellation Sagittarius with a dragon-headed tail indicated that the bright supernova of 1604 was also sighted by Indian astronomers. In this paper it will be shown that this identification is based on a misunderstanding of traditional Islamic astrological iconography and that the claim that the mural represents an early 17th-century Indian sighting of the supernova of 1604 has to be rejected.

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Blobrana


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Posts: 131433
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Supernova 1604
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Johannes Kepler began observing Supernova 1604 on October 17. It was subsequently named after him because his observations tracked the object for an entire year and because of his book on the subject, entitled De Stella nova in pede Serpentarii ("On the new star in Ophiuchus's foot", Prague 1606).
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Blobrana


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Kepler's Supernova Remnant: Was Kepler's Supernova Unusually Powerful?

Astronomers have long studied the Kepler supernova remnant and tried to determine exactly what happened when the star exploded to create it. New analysis of a long observation from NASA's Chandra X-ray Observatory is providing more clues. This analysis suggests that the supernova explosion was not only more powerful, but might have also occurred at a greater distance, than previously thought.
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Blobrana


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RE: Kepler's supernova remnant
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Kepler's supernova was first observed in northern Italy on October 9, 1604. Johannes Kepler began observing it on October 17. It was subsequently named after him because of his book on the subject entitled De Stella nova in pede Serpentarii ("On the new star in Ophiuchus's foot", Prague 1606).
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Title: The imprint of a symbiotic binary progenitor on the properties of Kepler's supernova remnant
Authors: A. Chiotellis, K.M. Schure, Jacco Vink

We present a model for the Type Ia supernova remnant (SNR) of SN 1604, also known as Kepler's SNR. We find that its main features can be explained by a progenitor model of a symbiotic binary consisting of a white dwarf and an AGB donor star with an initial mass of 4-5 M_sun. The slow, nitrogen rich wind emanating from the donor star has partially been accreted by the white dwarf, but has also created a circumstellar bubble. Based on observational evidence, we assume that the system moves with a velocity of 250 km/s. Due to the systemic motion the interaction between the wind and the interstellar medium has resulted in the formation of a bow shock, which can explain the presence of a one-sided, nitrogen rich shell. We present two-dimensional hydrodynamical simulations of both the shell formation and the SNR evolution. The SNR simulations show good agreement with the observed kinematic and morphological properties of Kepler's SNR. Specifically, the model reproduces the observed expansion parameters (m=V/(R/t)) of m=0.35 in the north and m=0.6 in the south of Kepler's SNR. We discuss the variations among our hydrodynamical simulations in light of the observations, and show that part of the blast wave may have traversed through the one-sided shell completely. The simulations suggest a distance to Kepler's SNR of 6 kpc, or otherwise require that SN 1604 was a sub-energetic Type Ia explosion. Finally, we discuss the possible implications of our model for Type Ia supernovae and their remnants in general.

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