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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421595.0, MPI für Astronomie / Publikationen_mpia
Tycho Brahe's 1572 supernova as a standard type Ia as revealed by its light-echo spectrum
Authors:Krause, O.; Tanaka, M.; Usuda, T.; Hattori, T.; Goto, M.; Birkmann, S.; Nomoto, K.
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Nature
Issue / Number:7222
Start Page:617
End Page:619
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Type Ia supernovae (SNe Ia) 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 are how the explosion actually proceeds and whether accretion occurs from a companion or via the merging of two white dwarfs. Tycho Brahe's supernova of 1572 (SN 1572) is thought to be one of the best candidates for a SN Ia in the Milky Way. The proximity of the SN 1572 remnant has allowed detailed studies, such as the possible identification of the binary companion, and provides a unique opportunity to test theories of the explosion mechanism and the nature of the progenitor. The determination of the yet unknown exact spectroscopic type of SN 1572 is crucial to relate these results to the diverse population of SNe Ia. Here we report an optical spectrum of Tycho Brahe's supernova near maximum brightness, obtained from a scattered-light echo more than four centuries after the direct light of the explosion swept past Earth. We find that SN 1572 belongs to the majority class of normal SNe Ia. The presence of a strong Ca II IR feature at velocities exceeding 20,000 km/s, which is similar to the previously observed polarized features in other SNe Ia, suggests asphericity in SN 1572.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL: [ID No:1]
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