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Tycho Brahe's 1572 supernova as a standard type Ia explosion revealed from its light echo spectrum
Oliver Krause, Masaomi Tanaka, Tomonori Usuda +4
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…
Absorption Line Survey of H3+ toward the Galactic Center Sources II. Eight Infrared Sources within 30 pc of the Galactic Center
Miwa Goto, T. Usuda, T. Nagata +7
Infrared absorption lines of H3+, including the metastable R(3,3)l line, have been observed toward eight bright infrared sources associated with hot and massive stars located in an…
The Cassiopeia A Supernova was of Type IIB
Oliver Krause, Stephan M. Birkmann, Tomonori Usuda +4
Cassiopeia A is one of the youngest supernova remnants known in the Milky Way and a unique laboratory for supernova physics. We present an optical spectrum of the Cassiopeia A supe…