Author Topic: SN2014J in M82 ( NGC 3034 )  (Read 6626 times)

c_cld

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SN2014J in M82 ( NGC 3034 )
« on: January 26, 2014, 03:14:50 pm »
« Last Edit: January 26, 2014, 03:29:53 pm by c_cld »

c_cld

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #1 on: January 26, 2014, 03:58:25 pm »
SN2014J
Localization of PSN J09554214+6940260
09 55 42.22  69 40 26.6
148.925904  69.674044 
in DR9


zoom-in with Aladin
« Last Edit: January 26, 2014, 04:37:13 pm by c_cld »

c_cld

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #2 on: January 26, 2014, 05:14:31 pm »
SN2014J

Is it expected to be as bright as neigbor star ?
gmag rmag imag zmag RAJ2000 DEJ2000
10.36 9.98 9.84 9.81 148.89562 +69.64869 (J/PASP/120/1128/catalog)

« Last Edit: January 26, 2014, 05:18:39 pm by c_cld »

NGC3314

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #3 on: January 26, 2014, 09:27:01 pm »
Most of the listed photometry for SN 2014J has been in the UBVRI system. Using the transformations between SDSS and UBVRI systems from Jester etal. for normal stars, the foreground star has B=10.68, V=10.13, R=9.76. The latest AAVSO light curve shows B=12.1, V=10.7, R=10.0, and still brightening (the color indices B-V, V-R are pretty red, agreeing with the spectrum that the SN lies behind substantial reddening dust,while the star is fairy blue). It is likely to surpass that star in the R band in a few days, with peak brightness estimated late this week, and might just equal it in V.

To see the latest light curve, go to the AAVSO light-curve generator and enter its name (last I checked, its original provisional designation PSN J09554214+6940260 was needed). There are choices for photometric bands to plot and timespan to cover.

planetaryscience

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #4 on: January 26, 2014, 09:43:25 pm »
After searching for the original star using an old image from Hubble, there appears to be a dust lane in front of the supernova location, eliminating any possibility of seeing it.
I like to find asteroids and galaxy mergers- but all galaxies are still fine to me.

NGC3314

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #5 on: January 26, 2014, 10:14:54 pm »
In more detail, people have been trying to work out where the SN is, knowing that HST positions often have subarcsecond systematic errors traceable to the original guide-star catalog. Here is one of the latest, using adaptive optics at Keck to refine the position. It first appeared that there might be a star cluster near the location, but now the progenitor is in a rather undistinguished part of M82 (not that most models for type Ia outburst would predict that we would have seen the progenitor, but it's good to test your expectations when actual data become available).

The whole series of recent ATel notifications like the one linked above is a good place to find breaking news, on SN2014J as well as all sorts of other transient events.

c_cld

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #6 on: January 26, 2014, 10:34:07 pm »
From SDSS images fits files available at http://dr10.sdss3.org/fields/name?name=M82

here is a composite of u,r,z bands in order to show enhanced dust lanes with SN2014J at red reticle:



 8) 8)
« Last Edit: January 26, 2014, 10:42:48 pm by c_cld »

graham d

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #7 on: January 27, 2014, 09:29:42 am »

planetaryscience

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #8 on: January 27, 2014, 02:43:10 pm »
Light curve so far for SN 2014J
I like to find asteroids and galaxy mergers- but all galaxies are still fine to me.

c_cld

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #9 on: January 27, 2014, 03:53:36 pm »
Better viewed within 6 days range, not posted as temporary link  :-[

c_cld

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planetaryscience

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #11 on: January 27, 2014, 04:05:56 pm »
Supernova magnitude: 10.6 and lowering (or rising depending on how you see it)
Increase per day: ~0.2 magnitude
Time to outshine M82: February 7th (11 days)
Time to be visible to naked eye: February 19th (23 days)assuming dimmest magnitude of 6

Note: this is assuming that the supernova keeps increasing at a constant rate.
I like to find asteroids and galaxy mergers- but all galaxies are still fine to me.

NGC3314

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #12 on: January 27, 2014, 04:20:51 pm »
Supernova magnitude: 10.6 and lowering (or rising depending on how you see it)

This looks like a good time for my mini-rant - because of the possibility of confusion, I strongly urge that magnitudes never be described as greater or less, increasing or decreasing, but brighter/fainter, brightening/fading.

The spectrum suggests that the SN will reach peak brightness in another 5-7 days. With the evidence for dust absorption attenuation of its light [1], I'm wondering whether the predictions of being visible in typical binoculars are pretty optimistic.


[1] No, I'm not still smarting from a journal referee who was very insistent about careful distinction between these terms, why do you ask?

c_cld

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #13 on: January 27, 2014, 04:26:42 pm »
Spectra
http://www.spectro-aras.com/forum/viewtopic.php?p=3380
Quote
Follows a comparison that shows spectrum evolution from 22 to 25 jan. Envelope expansion velocity derived from Si II minimum has decreased from about 14400 to 12800 Km/s. A similar trend (decreasing) seems to be shown by other absorption lines.


 :P

graham d

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Re: SN2014J in M82 ( NGC 3034 )
« Reply #14 on: January 27, 2014, 06:38:38 pm »
Quote
[1] No, I'm not still smarting from a journal referee who was very insistent about careful distinction between these terms, why do you ask?
lol
The referee was probably a botanist!

From what I've seen from Hubble is that there is a dust lane partially obscuring the stellar progenitor? Hence, it should prove to be dimmer than anticipated and provide a temporary back lit dust spectra., more intense than what an overlap would provide?