Josefine Selj, Dmitry Sharapov, Auni Somero, Linda Östman supervisor: Jesper Sollerman NORDFORSK Summer School on Observational Astrophysics at NOT and SST 27.6.-8.7.2006, La Palma, Canarian Islands. Supernovae. Outline. Motivation Supernovae what are they? Preparations Observations
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supervisor: Jesper Sollerman
NORDFORSK Summer School on Observational Astrophysics at NOT and SST
27.6.-8.7.2006, La Palma, Canarian IslandsSupernovae
Subclasses and their spectra:
-Type II-L - linear decrease in their light curve (linear in magnitude vs time) featureless and blue at early times
-Type II-P – reach a plateau in their light curve, featureless and blue at early times. At the plateau one finds strong Balmer lines and Ca ll H&K. Late time spectra have strong H_alpha and emission lines from OI and CaII
-Type IIn – narrow emission lines, may be produced by the interaction of the ejecta with dense circumstellar material. Slowly declining light curves.
Ia has (1) broader features, (2) a Si absorption line at 6355 Å, (3) Ca II abs lines at ~3950 Å
II has (1) P Cygni profiles, (2) a strong H_alpha emission line at 6863 Å, (3) Ca II absorption line at 8500, (4) Na I abs line at ~ 5800 Å. The absorption at ~ 7600 Å is atmospheric
- Bright supernovae
- Visibility plot
- Exposure time estimates
- Night schedule
- Finding charts
- Spectroscopy, which grism, slit?
- Photometry, which filters?
- fields at same airmass
- in right filters and grisms/slits
SN2006bp –photometry (BVR) and spectroscopy (gr 4)
SN2006cz – photometry (BVR) and spec. (gr 4)
SN2006dh – photometry (UBVRi) and spec. (gr 4)
SN2006cu – photometry (VR) and spec. (gr 7)
+ spec. flats (Halogen), arc lamps (He, Ne), twilight flats, photometric and spectroscopic standards. grism #4: 3200 – 9100 Å, grism #7: 3850 – 6850 Å, slit width 1.3”
Second half of the night, with ALFOSC:
SN2006ca – photometry (BVRi) and spec. (grism 4)
SN2006cm – photometry (VR) and spec. (grism 4)
SN2006dm –photometry (R) and spec. (grism 4)
SN2005hk – photometry (UBVRi) and spec. (grism 4)
+ spec. flats, arclamps, twilight flats, spectroscopic and photometric standards
- SN2005dh – photometry (JKsH)
- twilight flats and standard field
Lightcurve for SN2005hk. Our points are the last four, the second last date is from D1.5 at la Silla.
Here: B (black), V-1 (green), R+2 (blue) and i-3(red)
Twinkle twinkle little starNow we know just what you areMaking atoms in your coreHelium and many moreTwinkle twinkle little starNow we know just what you are.
Twinkle twinkle little starHow I've wondered what WE areNow I know you're made of dustNow I know you're just like usTwinkle twinkle, oh so farNow I know I am a star.