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SN2009ip. Lehet, hogy megiscsak szupernova kitoresrol van szo?

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ATEL #4423      ATEL #4423

Title: SN2009ip: Brightening Rapidly
Author: J. Brimacombe (Coral Towers Observatory)

Posted: 25 Sep 2012; 20:45 UT

On 2012 Aug. 24 Drake et al. (2012, ATel#4334) reported a new outburst
from supernova
impostor (LBV) SN 2009ip (Smith et al., 2010, AJ, 139, 1451; Foley et al.,
2011, ApJ,
732, 32). Observations by Foley et al. (2012, Atel#4338) on Aug 26 UT showed
an
outburst spectrum similar to a previous event (Foley et al., 2011). Spectroscopic

observations by Smith & Mauerhan (2012, ATel#4412) on Sept. 15 & 16 exhibited
very
broad lines strongly suggesting that SN 2009ip had become a real supernova.

However, Margutti et al. (2012, ATel#4414) analyzed SWIFT UVOT observations

from Sept. 20 and Sept 22 and found no clear evidence for a re-brightening
and suggested
that this result was inconsistent with evidence for an emerging supernova.
Furthermore,
based on observations from Sept. 11  & 24 Martin et al. (2012, ATel#4416)
reported
that SN2009ip was dimming and reddening at a rate that is inconsistent
with a true
supernova.

We obtained observations on SN 2009ip from Coral Towers Observatory 0.4m
(CT) and New
Mexico Skies 0.5m (NM) and find the following results:

Sept. 23.60 I=18.2+/-0.3 (CT)
Sept. 24.57 I=16.6+/-0.3 (CT)
Sept. 25.20 I=15.0+/-0.3 (NM)
Sept. 25.52 I=15.6+/-0.3 (CT).

The NM measurement is blended with a nearby source with mag R=17.7.

We find clear evidence that the source significantly brightened at red
wavelengths over a
period of ~46 hrs. The current brightness suggests that SN 2009ip has indeed
become a
supernova. The dimming observed by Martin et al. (2012) may be a sign of
shocks interacting with shells
of circumstellar material from previous outbursts.

We strongly encourage further follow-up in multiple photometric bands.

http://www.astronomerstelegram.org/?read=4423

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Fidusz (FIDRICH Robert)
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