tipa -- 7/8/2009

Variable Sodium Absorption in a Low-Extinction Type Ia Supernova

• Authors: Joshua D. Simon (Carnegie Observatories), Avishay Gal-Yam (Weizmann Institute), Orly Gnat, Robert M. Quimby (Caltech), Mohan Ganeshalingam, Jeffrey M. Silverman (UC Berkeley), Stephane Blondin (ESO), Weidong Li, Alexei V. Filippenko (UC Berkeley), J. Craig Wheeler (Texas), Robert P. Kirshner (CfA), Ferdinando Patat (ESO), Peter Nugent (LBL), Ryan J. Foley (CfA), Steven S. Vogt (UCSC), R. Paul Butler (Carnegie DTM), Kathryn M. G. Peek (UC Berkeley), Erik Rosolowsky (UBC Okanagan), Gregory J. Herczeg (MPE), Daniel N. Sauer (Stockholm), Paolo A. Mazzali (MPA)

Constraining the Milky Way potential with a 6-D phase-space map of the GD-1 stellar stream

• Authors: Sergey E. Koposov (1,2,3), Hans-Walter Rix (1), David W. Hogg (1,4) ((1) Max Planck Institute for Astronomy, Heidelberg, Germany, (2) Institute of Astronomy, Cambridge, UK, (3) Sternberg Astronomical Institute, Moscow, Russia, (4) New York University, New York, USA)

The hydrodynamics of the supernova remnant Cas A: The influence of the progenitor evolution on the velocity structure and clumping

• Authors: B. van Veelen, N. Langer, J. Vink, G. García-Segura, A.J. van Marle