PDA

View Full Version : new supernova (probably) in M74



StupendousMan
2013-Jul-27, 06:13 AM
Yo! There's a transient point source 93 arcsec East and 135
arcsec South of M74. At UT July 27 05:30, I measured
it to be about V = 13 and very blue.

See the AAVSO forum entry called "bright transient in
M74 - PSN J01364816+1545310".

It has JUST been noticed, so any measurements you can make
are very valuable! M74 is only about 10 Mpc away,
so this will likely be one of the best supernovae of the
year. If you can observe it tonight, please do and report
your result here (or elsewhere) - I will be happy
to help with reductions and analysis.

Don Alexander
2013-Jul-27, 12:48 PM
Oy, awesome!!

On http://www.rochesterastronomy.org/supernova.html, it's already up as the brightest onhoing (P)SN so far.

M74 is famous for the moderately luminous broad-lined Type Ic SN 2002ap.

Don Alexander
2013-Jul-27, 11:38 PM
It is a Type II SN... (http://www.astronomerstelegram.org/?read=5228)

... for which an optical progenitor... (http://www.astronomerstelegram.org/?read=5229)

... and likely a NIR Spitzer progenitor have been found already. (http://www.astronomerstelegram.org/?read=5230)

Looks very strongly like a classical Type II, probably a Type IIP, from a red supergiant progenitor.

StupendousMan
2013-Jul-28, 10:45 AM
Man, these groups are too fast. I was planning on spending the day looking at HST images to find the progenitor myself. Darn it. If only I weren't still suffering from jet lag ..... nah, they still would have beaten me to it.

Let this be a lesson, kids: don't get caught up in trying to be the "first" to report something.

Ara Pacis
2013-Jul-28, 03:05 PM
Maybe you'll get the next one, Stupe.

I hope it's in the Milky Way. We haven't had on in over 400 years, right? Any particular reason for that or is it just coincidence? Quite a coincident that we haven't had one in the age of telescopes.

Romanus
2013-Jul-28, 04:18 PM
^
We had one in the mid-19th century; it was, however, too heavily obscured to be visible from Earth. Modern instruments would've found it easily, though.

Personally, I'm angling for a SN in either M 33 or M 31, with a Type II in the former being a little more likely IMO. A typical event in either galaxy would be an easy binocular target. If we're lucky enough to see a Type Ia in the LMC, a little back-of-the envelope math shows that it would outshine every star but Sirius.