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Observing >> Variable Star Observing and Radio Astronomy

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acr_astro
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Reged: 01/16/13

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Supernova in M82 new
      #6327819 - 01/22/14 08:38 AM

Hi,

last night, a new possible supernova in M82 has been observed. Currently it has already a brightness of 11.7mag.

http://www.cbat.eps.harvard.edu/unconf/followups/J09554214+6940260.html

"2014 01 22.3955
L. Elenin (Lyubertsy, Russia) and I. Molotov (Moscow, Russia) confirm an apparent supernova PSN J09554214+6940260 in M82. Object visible on 4 (BVRI) images remotely taken at ISON-NM Observatory (Mayhill, NM, USA) with 0.4-m f/3 telescope + CCD (KAF09000) on Jan. 22.3955, 2014. Object located at 09h 55m 42s.15 +/- 0".13, +69d 40' 25".8 +/- 0".11 (UCAC-4) with magnitudes 12.91B (22.3955); 11.72V (22.4101); 11.31R (22.4061); 11.33I (22.4066). Nothing is visible at this position on the archive POSS and POSSII images. Image of PSN J09554214+6940260 available at http://spaceobs.org/images/TOCP/PSNJ09554214+6940260-20140122.png"


Further info as well here: PSN J09554214+6940260

Achim

P.S. I'm not sure whether this post is in the correct sub-forum. Dear Moderators, please move appropriately.


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Rich (RLTYS)Moderator
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Re: Supernova in M82 new [Re: acr_astro]
      #6327928 - 01/22/14 09:39 AM

Thanks for the info. Would love to check this PSN out if only the weather would cooporate.

Rich (RLTYS)


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nytecam
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Re: Supernova in M82 new [Re: Rich (RLTYS)]
      #6329136 - 01/22/14 06:48 PM

Quickie from tonight through cloud gaps



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nytecam
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Reged: 08/20/05

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Re: Supernova in M82 new [Re: nytecam]
      #6331185 - 01/23/14 06:25 PM Attachment (22 downloads)

tonight's quicky ! Supernova discovered on my patch

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Rich (RLTYS)Moderator
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Re: Supernova in M82 new [Re: acr_astro]
      #6334214 - 01/25/14 06:41 AM Attachment (26 downloads)

Here's an image of SN 2014J in M82 that I took last night useing the SLOOH Remote Observatory. This image is in green light.

Rich (RLTYS)


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dobsoscope
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Reged: 05/24/06

Re: Supernova in M82 new [Re: Rich (RLTYS)]
      #6341566 - 01/28/14 06:05 PM

So what is the difference between a nova and a Type Ia supernova?

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brianb11213
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Re: Supernova in M82 new [Re: dobsoscope]
      #6341711 - 01/28/14 07:28 PM

Quote:

So what is the difference between a nova and a Type Ia supernova?



Nova - thermonuclear reaction in the outer layer of a white dwarf which is accreting material from a close binary companion. The core of the star is not affected. Much of the accreted material is blown off in the outburst but accretion continues & will eventually repeat.

Supernova (type 1a) - accretion raises the mass of a white dwarf above the Chandrasekhar limit, the whole core collapses, some forms a neutron star & some reacts to "heavy" elements (mostly silicon & iron group) which are ejected into interstellar space. (In fact a large part of the reaction is Si(28) fusing to Ni(56) which decays to Co(56) then to Fe(56). The half lives of the Ni->Co and Co->Fe beta decay reactions can be seen in the light curve.)

There are other types of supernova but all result in the destruction of the star's core or its conversion to nuclearly inert material (neutron star or black hole) so a SN event occurs at most once in the life of a star.

Supernovae are very much more luminous than ordinary novae. SN can be detected at huge distances - out to the edge of the observable universe, with modern observatory equipment - whereas ordinary novae can be detected only in nearby (local group) galaxies.


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crow
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Re: Supernova in M82 new [Re: brianb11213]
      #6341879 - 01/28/14 09:01 PM

Nice info. Neutron stars are just plain weird from the what I can gather, any explanation as what takes them into Magnetar territory. Is that simply a product of the mass of original star?

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Rich (RLTYS)Moderator
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Re: Supernova in M82 new [Re: crow]
      #6342449 - 01/29/14 06:13 AM Attachment (15 downloads)

Once again I imaged SN 2014J with the SLOOH Remote Observatory useing the T2hm scope. Based on the previous image taken 1-25 I'd estimated its mag at 11.1. On my latest image 1-29 SN 2014J appears to have brighten, estimated mag 10.6.

Rich (RLTYS)


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brianb11213
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Re: Supernova in M82 new [Re: crow]
      #6342457 - 01/29/14 06:21 AM

Quote:

Neutron stars are just plain weird from the what I can gather, any explanation as what takes them into Magnetar territory. Is that simply a product of the mass of original star?



I'm not sure on this. I thought "magnetars" were a special class of white dwarf where the magnetic field strength is such that accreting material is funnelled down onto the magnetic poles rather than forming an accretion disk around the (spin axis) equator.

Neutron stars - being much smaller - have far more concentrated magnetic fields & as far as I know would all be "extreme magnetars" - the (magnetic) polar jets cause the pulsar phenomenon - a pulsar is just a neutron star which has not yet lost its angular momentum, and whose magnetic axis sweeps across our line of sight closely enough for us to observe the variation. As far as I know.


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dobsoscope
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Re: Supernova in M82 new [Re: brianb11213]
      #6342541 - 01/29/14 08:15 AM

thanks a lot

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crow
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Re: Supernova in M82 new [Re: dobsoscope]
      #6342812 - 01/29/14 10:52 AM

Yeah I'm not sure either. I thought they were formed in single star super nova's, from a star with a mass more than that which would form a neutron star/pulsar, but not quite big enough to form a singularity. I need a good, up to date book on this stuff.

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brianb11213
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Re: Supernova in M82 new [Re: crow]
      #6343194 - 01/29/14 01:47 PM

Quote:

a mass more than that which would form a neutron star/pulsar, but not quite big enough to form a singularity.



Unless the our knowledge of quantum electrodynamics is completely wrong, once a neutron star gets massive enough it has no choice other than to collapse to a singularity. There is no degeneracy pressure strong enough to halt the collapse.

But please note that the outer layer of a neutron star will always consist (mostly) of iron - at the surface the pressure isn't enough to crush electrons into the atomic nuclei so atoms will exist to a depth where the pressure becomes large enough to overcome electron degeneracy. That iron shell will serve to provide the potential for huge magnetic fields, and the existing magnetic field of the progenitor star will be largely conserved during the collapse so that the magnetic fields will be much more concentrated at the surface of a neutron star (radius a few km) than they would be in a white dwarf (radius a few thousand km) or a normal main sequence star (radius of the order of a million km).


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crow
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Re: Supernova in M82 new [Re: brianb11213]
      #6343781 - 01/29/14 05:45 PM

Thanks, that explains a lot an Iron rich crust over the other material, especially if there is any kind of fluid like structure/condition going on underneath. Man that must be some solid Iron.

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Rich (RLTYS)Moderator
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Re: Supernova in M82 new [Re: acr_astro]
      #6344660 - 01/30/14 08:16 AM

Finally had the oppertunity to visually observe SN 2014J with my 10" refl at 174x. Despite a bright sky and snow SN 2014J was easy to observe. Useing comparision stars 106 and 112, I estimated the SN's magnitude at 10.8.

Rich (RLTYS)


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NJScope
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Re: Supernova in M82 new [Re: acr_astro]
      #6344853 - 01/30/14 10:35 AM Attachment (17 downloads)

After nearly a month of bad weather, I finally got out last night to image SN 2014J. Photometric estimates using the AAVSO reference stars in the same FOV put SN 2014J at 10.56±0.02 mag in V and 9.90±0.02 mag in R. These would appear to agree with data thus far generated at the AAVSO website.

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robin_astro
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Reged: 12/18/05

Re: Supernova in M82 new [Re: brianb11213]
      #6345518 - 01/30/14 04:22 PM

Hi Brian,

As far as I am aware it is believed that in type 1a supernova the star is completely destroyed. (As the star reaches the Chandrasekar limit, the impending collapse increases the temperature to the point where runaway C and O fusion takes place throughout the star and the star explodes leaving nothing behind)

Cheers
Robin


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ido
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Reged: 06/29/06

Re: Supernova in M82 [Re: robin_astro]
      #6346017 - 01/30/14 09:00 PM

The SN using Bareket observatory's remote scope
http://www.bareket-astro.com/internet-remote-automatic-telescope-israel-middl...


http://astronomia.co.il/media/kunena/attachments/490/m82_sn2.png


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