7 research outputs found
Massive stars exploding in a He-rich circumstellar medium. V. Observations of the slow-evolving SN Ibn OGLE-2012-SN-006
We present optical observations of the peculiar Type Ibn supernova (SN Ibn)
OGLE-2012-SN-006, discovered and monitored by the OGLE-IV survey, and
spectroscopically followed by PESSTO at late phases. Stringent pre-discovery
limits constrain the explosion epoch with fair precision to JD = 2456203.8 +-
4.0. The rise time to the I-band light curve maximum is about two weeks. The
object reaches the peak absolute magnitude M(I) = -19.65 +- 0.19 on JD =
2456218.1 +- 1.8. After maximum, the light curve declines for about 25 days
with a rate of 4 mag per 100d. The symmetric I-band peak resembles that of
canonical Type Ib/c supernovae (SNe), whereas SNe Ibn usually exhibit
asymmetric and narrower early-time light curves. Since 25 days past maximum,
the light curve flattens with a decline rate slower than that of the 56Co to
56Fe decay, although at very late phases it steepens to approach that rate. An
early-time spectrum is dominated by a blue continuum, with only a marginal
evidence for the presence of He I lines marking this SN Type. This spectrum
shows broad absorptions bluewards than 5000A, likely O II lines, which are
similar to spectral features observed in super-luminous SNe at early epochs.
The object has been spectroscopically monitored by PESSTO from 90 to 180 days
after peak, and these spectra show the typical features observed in a number of
SN 2006jc-like events, including a blue spectral energy distribution and
prominent and narrow (v(FWHM) ~ 1900 km/s) He I emission lines. This suggests
that the ejecta are interacting with He-rich circumstellar material. The
detection of broad (10000 km/s) O I and Ca II features likely produced in the
SN ejecta (including the [O I] 6300A,6364A doublet in the latest spectra) lends
support to the interpretation of OGLE-2012-SN-006 as a core-collapse event.Comment: 16 pages, 9 figures, 4 tables. Accepted by MNRA
LâAUTOCOSTRUZIONE NELLE SCUOLE DI PROGETTAZIONE ARCHITETTONICA
This book is the staging of a story that tells the conception, development, and construction of an architecture: the Self-Sufficient Housing Module for Cycle Travelers and Walkers (MAACC), self constructed by the Recyclo student team of the Politecnico di Torino created at the headquarters of the Parco delle Lame del Sesia in Albano Vercellese. The MAACC represents a multidisciplinary in-depth study on the still little-explored theme of architecture dedicated to tourism based on the practice of active mobility. The story uses the structure of a play. Seven âscenes,â separated by six âintervals,â consisting of essays that explore some of the general issues that this experience has brought to light, punctuate a story that also makes use of some âpicturesâ containing the contributions of the various âactorsâ involved. The play illustrates a way of teaching which focuses on autonomy, responsibility, and the passion of the students: the real protagonists of this story
VizieR Online Data Catalog: Optical/NIR photometry of OGLE-2012-SN-006 (Pastorello+, 2015)
Photometric measurements in the optical and NIR bands were obtained through the PSF-fitting technique. A template PSF was built using stars in the SN field. With this PSF model along with a low-order polynomial surface, we finally performed a fit to the SN and the underlying background. OGLE-IV photometry was obtained using the difference imaging analysis, which is a template subtraction method adapted to the OGLE data and detailed in Wyrzykowski et al. 2014, J/AcA/64/197 (see also Wozniak 2000, J/AcA/50/421). (2 data files). <P /