Author Topic: Supernova Science  (Read 36761 times)

c_cld

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Re: Supernova Science
« Reply #120 on: January 17, 2012, 07:55:27 am »
Absent a visible SN in the images it would be a lot easier to try to visualize your possible unreported type Ia spectrum with a 4 in 1 graph which would include your "discovery" spectrum, a classical type Ia spectrum, a (luminous?) red galaxy spectrum and a QSO-BAL spectrum. Examples of the last 2 are here: http://www.sdss.org/dr7/algorithms/spectemplates/index.html Claude, can you construct this graph?
My potential SN Ia candidate 587742014911611038 has a spectrum pattern comparable to the confirmed SN Ia 588017949357637652 "SN 2004co" as you could see by the graph attached. No need to calculate a Principal Componet Analysis (PCA) to affirm that.

Those 2 spectra are not correctly fitted by templates (LRG or QSO-BAL) as the SDSS pipelines put warnings (see SN2004co in DR6! ). You could plot them, if you want with LRG 1237649954404630678 or 1237663784218394834 of the same area, date obs, similar redshift. For QSO_BAL I suggest 1237668272444473654 or 1237668298758357168 but it's useless to my viewpoint. Only to check that these objects looks like the templates unidentified in the DR7 algorithm link.

Attached coplot in red "SN 2004co" and in blue 587742014911611038

« Last Edit: January 17, 2012, 07:58:10 am by c_cld »

c_cld

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Re: Supernova Science
« Reply #121 on: January 17, 2012, 08:55:44 am »
For comparison, here are the optical spectra of fairly typical supernovae of types Ia and II.

For type Ia (destruction of a white dwarf), we don't see hydrogen lines but instead very broad features from Mg (4300 A, just at the blue end), Ca (way out in the red around 8500 A), Fe (4900 A), Si (6200), and so on.
...
In both cases, the spectrum changes with time. As the fireball expands and thins, we see progressively deeper into the debris, looking in some cases at layers of elements originally fused deeper and deeper inside the star.

Illustration of this evolution of SN I a spectrum with courtesy of St├ęphane Blondin (IN2P3, Marseille, France)


and courtesy of Kasen & Woosley
« Last Edit: January 17, 2012, 10:09:35 am by c_cld »

Blackprojects

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Re: Supernova Science
« Reply #122 on: August 03, 2012, 08:59:50 pm »
REST IN PEACE SUPER NOVAE ZOO


RETIRED SUPER NOVAE ZOO



http://blog.galaxyzoo.org/2012/08/03/supernova-project-retires/

c_cld

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Blackprojects

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Re: Supernova Science
« Reply #124 on: August 21, 2012, 12:38:16 pm »
An Old Type II Super Novae with Attitude!

Totaly destroyed it"s Self No Pulsar No Magnetar No Black Hole no NOTHING!

http://en.wikipedia.org/wiki/SN_2007bi

Blackprojects

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Re: Supernova Science
« Reply #125 on: September 18, 2012, 02:04:57 am »
Is this part of the Zoo going to be Archived as in Stuck in Red Giants section?

Blackprojects

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Re: Supernova Science
« Reply #126 on: December 18, 2013, 09:48:19 am »
A 1/10th Scale  Type 1a Explosion Nicknamed the TYPE .1a Two White Dwarfes get really close start Getting together and a really Big Explosion Takes place but not a Type 1a as the star survives but in a Damaged condition

http://www.chandra.si.edu/photo/2013/amcvn/

c_cld

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Re: Supernova Science
« Reply #127 on: February 04, 2014, 10:10:02 am »
unreported SN: SDSS J025448.48-071735.3  1237652901303943234
587727180079038536

unseen in DSS survey  :P

on 2000-9-26:10:5


DR7 spectrum on  2000-12-23 (3 months after img) !
reprocessed wrongly in DR8-9-10 with bad mapping lines!
in Simbad "SDSS J025448.47-071735.3  -- Object of unknown nature" ...  :(
« Last Edit: February 04, 2014, 10:15:26 am by c_cld »

c_cld

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Re: Supernova Science
« Reply #128 on: April 06, 2014, 01:20:46 pm »
unreported SNIa
host SDSS J114428.45-015300.3 587725041163960473
1237671127514349706
mjd_r 5.16064168E4 i.e.  2000-03-03 10:00

spectrum obtained three years after image:  mjd 52282 i.e. 2003-03-23:
Typical SN Ia spectrum
DR7

DR10 -  bad mapping lines
failed pipeline processing in DR7 and DR8-9-10!


 :(  :(