Tycho Brahe’s 1572 supernova as a standard type Ia as revealed by its light-echo spectrum

  title={Tycho Brahe’s 1572 supernova as a standard type Ia as revealed by its light-echo spectrum},
  author={Oliver Krause and Masaomi Tanaka and Tomonori Usuda and Takashi Hattori and Miwa Goto and Stephan M. Birkmann and Ken’ichi Nomoto},
Type Ia supernovae are thermonuclear explosions of white dwarf stars in close binary systems. They play an important role as cosmological distance indicators and have led to the discovery of the accelerated expansion of the Universe. Among the most important unsolved questions about supernovae are how the explosion actually proceeds and whether accretion occurs from a companion or by the merging of two white dwarfs. Tycho Brahe’s supernova of 1572 (SN 1572) is thought to be one of the best… 
No hot and luminous progenitor for Tycho’s supernova
Type Ia supernovae have proven vital to our understanding of cosmology, both as standard candles and for their role in galactic chemical evolution; however, their origin remains uncertain. The
Astrophysics: Echo from an ancient supernova
The recent discovery of light echoing from Tycho Brahe's supernova of 1572, and now the determination of its optical spectrum, confirm the suspicion that 'SN 1572' is in fact a type Ia supernova in the authors' cosmological backyard, the Milky Way.
Surviving companions of Type Ia supernovae: theory and observations
Improved Hubble Space Telescope Proper Motions for Tycho-G and Other Stars in the Remnant of Tycho's Supernova 1572
With archival and new Hubble Space Telescope observations we have refined the space-velocity measurements of the stars in the central region of the remnant of Tycho’s supernova (SN) 1572, one of the
RGS Observations of Ejecta Knots in Tycho’s Supernova Remnant
We present results from XMM-Newton/Reflection Grating Spectrometer (RGS) observations of prominent knots in the southernmost portion of Tycho’s supernova remnant, known to be the remnant of a Type Ia
44Ti ejecta in young supernova remnants
Context. Tracing unstable isotopes produced in supernova nucleosynthesis provides a direct diagnostic of supernova explosion physics. Theoretical models predict an extensive variety of scenarios,
The detection of a light echo from SN 2007AF
Type Ia supernovae are widely studied for their uniform properties, which make them ideal candidates for cosmological surveys. Although these exploding stars are popular targets, key fundamental
Light Echoes and Late-Time Emissions of Type IA Supernovae
Type Ia supernovae have many applications in astronomy, yet with fundamental properties still not fully understood, new methods for investigating the environment of a supernova need to be developed.
On the Brightness of Surviving Companions in Type Ia Supernova Remnants
The progenitor systems for type Ia supernovae are still controversial. One of the methods to test the proposed scenario for the progenitor systems is to identify companions that are supposed to
Probing the Innermost Ejecta Layers in Supernova Remnant Kes 75: Implications for the Supernova Progenitor
Supernova remnants (SNRs) that contain pulsar wind nebulae (PWNe) are characterized by distinct evolutionary stages. In very young systems, the PWN drives a shock into the innermost supernova (SN)


The binary progenitor of Tycho Brahe's 1572 supernova
A survey of the central region of Tycho's supernova remnant, around the position of the explosion, finds a type G0–G2 star, similar to the authors' Sun in surface temperature and luminosity (but lower surface gravity), which appears to be the surviving companion of the supernova.
Tycho Brahe's Supernova: Light from Centuries Past
The light curve of SN 1572 is described in the terms used nowadays to characterize Type Ia supernovae (SNe Ia). By assembling the records of the observations done in 1572-1574 and evaluating their
We present an analysis of the chemical abundances of the star Tycho G in the direction of the remnant of supernova (SN) 1572, based on Keck high-resolution optical spectra. The stellar parameters of
Scattered-Light Echoes from the Historical Galactic Supernovae Cassiopeia A and Tycho (SN 1572)
We report the discovery of an extensive system of scattered-light echo arclets associated with the recent supernovae in the local neighborhood of the Milky Way: Tycho (SN 1572) and Cassiopeia A.
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 ≤ z ≤ 0.62. The luminosity distances of these objects are determined by methods that
The Cassiopeia A Supernova Was of Type IIb
The spectrum shows that Cassiopeia A was a type IIb supernova and originated from the collapse of the helium core of a red supergiant that had lost most of its hydrogen envelope before exploding.
Comparative Direct Analysis of Type Ia Supernova Spectra
As the first step in a comprehensive, comparative, direct analysis of the spectra of Type Ia supernovae (SNe Ia), we use the parameterized supernova synthetic‐spectrum code SYNOW to interpret 26
Internal dynamics and particle acceleration in Tycho's SNR
Aims. The consequences of a newly suggested value for the SN explosion energy E sn = 1.2 $\times$ 10 51  erg are explored for the case of Tycho's supernova remnant (SNR). Methods. A nonlinear kinetic
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SN 1991T was a peculiar object whose premaximum optical spectrum did not resemble that of any known supernova; it appears to have been dominated by lines of iron-group elements. Near maximum
Accreting white dwarf models for type I supernovae. III. Carbon deflagration supernovae
The carbon deflagration models in accreting C+O white dwarfs are presented as a plausible model for Type I supernovae. The evolution of the white dwarf is calculated from the beginning of accretion.