ar X iv : a st ro - p h / 04 07 10 4 v 1 6 J ul 2 00 4 Stability of SN Ia progenitors against radial oscillations

ar X iv : a st ro - p h / 05 07 06 6 v 1 4 J ul 2 00 5 Multiband Echo Tomography of Sco X - 1

ar X iv : a st ro - p h / 04 05 56 0 v 1 2 7 M ay 2 00 4 ESC Observations of SN 2002 er around Maximum Light

We present preliminary results of the observational campaign on SN 2002er carried out by the European Supernova Collaboration (ESC). For this supernova the optical coverage from epochs −11 days to +50 days is excellent, both in imaging and spectroscopy. The extinction deduced from the photometry is E(B − V) = 0.35, while ∆m15 = 1.31. In general SN 2002er behaves like a " normal " type Ia supern...

ar X iv : a st ro - p h / 02 10 62 1 v 1 2 9 O ct 2 00 2 Search for double degenerate progenitors of

We report on a large survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surveY – SPY). About 560 white dwarfs were checked for radial velocity variations until now. Ninety new DDs have been discovered, including short period systems with masses close to the Chandrasekhar mass. 1 The project Su...

ar X iv : a st ro - p h / 01 03 03 4 v 1 2 M ar 2 00 1 The Peculiar Type Ia Supernova 1999 by : Spectroscopy at Early Epochs

We present medium resolution (λ/∆λ ≈ 2500) optical spectroscopy of SN 1999by in NGC 2841 made around its light maximum. The depth ratio of the two Si II features at 5800Å and 6150Å being R(SiII)≈ 0.63 at maximum indicates that this SN belongs to the peculiar, sub-luminous SNe Ia. Radial velocities inferred from the minimum of the 6150Å trough reveal a steeper decline of the velocity curve than ...

ar X iv : a st ro - p h / 06 11 54 4 v 1 1 6 N ov 2 00 6 Discovery of a nearby twin of SN 1987 A ’ s nebula around the