• Publications
  • Influence
Detection of Circumstellar Material in a Normal Type Ia Supernova
The spectroscopic detection of circumstellar material in a normal type Ia supernova explosion indicates that this material was ejected from the progenitor system.
Ultra-high-resolution observations of the intrinsic line profiles of interstellar CH, CH+ and CN
Ultra-high-resolution (0.3 km s–1 FWHM) observations of interstellar CH and CH+ are presented for five southern stars (HD 110432, 152234, 152235, 152236 and 152270); CN spectra were also obtained for
Beyond the nation-state
Andrejs Baidins has a naive faith in the institution of the nation-state if he believes that a multiplicity of them will result in “an unprecedented leap of progress”. In a curious lapse into social
A study of interstellar Na i D absorption lines towards the Lupus molecular clouds
Intermediate-resolution (60 000 ≤ R ≤ 120 000) observations of interstellar Na I lines towards 29 stars in the general direction of the Lupus molecular clouds (330° ≲ l ≲ 350°; 0° ≲ b ≲ 25°) are
Spatially resolved optical spectroscopy of the Herbig Ae/Vega-like binary star HD 35187
We report on observations of the young binary system HD 35187 (SAO 77144). For the first time, we have obtained spatially resolved optical spectra of the individual stars. Analysis of their effective
An ultra‐high‐resolution study of the interstellar medium towards Orion
We report ultra-high-resolution observations (R approximate to 9 x 10(5)) of Na I, Ca II, K I, CH and CH+ for interstellar sightlines towards 12 bright stars in Orion. These data enable the detection
Laboratory impacts into dry and wet sandstone with and without an overlying water layer: Implications for scaling laws and projectile survivability
Abstract— Scaling laws describing crater dimensions are defined in terms of projectile velocity and mass, densities of the materials involved, strength of the target, and the local gravity. Here, the
Constraining the source regions of lunar meteorites using orbital geochemical data
Lunar meteorites provide important new samples of the Moon remote from regions visited by the Apollo and Luna sample return missions. Petrologic and geochemical analysis of these meteorites, combined