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ATEL #4412 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ATEL #4412



Title: =A0SN 2009ip: an LBV becomes a real supernova

Author: Nathan Smith, Jon Mauerhan (U. Arizona)

Queries: =A0 =A0 =A0 =A0 cvml', 'nathans@as.arizona.edu')">nathans@as.arizona.edu >
Posted: 22 Sep 2012; 03:43 UT

Subjects:Optical, Star, Supernovae, Transient, Variables





SN 2009ip was a transient source that was attributed to the eruption of

a massive LBV star. =A0Pre-discovery images with HST showed a massive blue<=
br>
progenitor star with a ZAMS mass of about 60 M_sun or more (Smith et al. >
2010; Foley et al. 2011) as well as pre-outburst variability consistent

with a massive eruptive LBV (Smith et al. 2010), culminating in an eruption=


with a peak absolute magnitude of -14.5 mag (Smith et al. 2010). =A0It then=


had a second LBV-like outburst in July 2010 with a peak absolute magnitude<=
br>
of about -14 (Drake et al. 2010; ATel 2897).



Drake et al. (2012; ATel #4334) then reported a third brightening of the >
object on 2012 July 24, which reached an absolute magnitude brighter than r>
-14.5 by August 2012. =A0Foley et al. (2012; ATel #4338) reported that a >
high-resolution spectrum of SN2009ip in this most recent outburst obtained<=
br>
on 2012 August 26 showed bright Balmer lines with Lorentzian profiles that<=
br>
have FWHM of 640 km/s. This is similar to the spectra of its previous 2009<=
br>
outburst (Smith et al. 2010; Foley et al. 2011).



We obtained low and moderate-resolution spectra using the Steward Observato=
ry

B&C spectrograph on the Bok 90" telescope on Kitt Peak on 2012 Sep=
tember

15 and 16, which reveal important changes in the spectrum. =A0In addition r>
to the narrow lines reported previously, the new spectra also show very

broad lines typical of a normal Type II supernova. =A0H Balmer lines have r>
strong P Cygni profiles, with a minimum in the absorption at -6000 km/s, >
and a blue edge to the absorption at -13,000 km/s. =A0Although calibrated r>
photometry was not obtained, the object in the guider camera (red sensitive=
)

appeared brighter than at any previous time compared to nearby field stars.=


It seems probable that the object discovered as SN 2009ip has suffered

multiple LBV eruptions, but has now exploded as a genuine core-collapse

supernova of Type IIn.



We encourage immediate intense followup observations at all wavelengths. >


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