[IAUC] CBET 2089: 20091222 : SUPERNOVAE 2009ly AND 2009ml-2009ms

Mar Dic 22 19:29:05 ART 2009

                                                  Electronic Telegram No. 2089
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVAE 2009ly AND 2009ml-2009ms
     Further to CBET 1961, D. Sand, Harvard-Smithsonian Center for
Astrophysics and the Las Cumbres Observatory Global Telescope Network; M. L.
Graham and C. Bildfell, University of Victoria; S. Herbert-Fort, D. Just, and
S. Sivanandam, Steward Observatory; C. J. Pritchet, University of Victoria;
H. Hoekstra, Leiden University; and D. Zaritsky, Steward Observatory, report
the discovery of eight normal-type-Ia supernovae on g' and r'-band images
obtained at the Canada-France-Hawaii Telescope (+ Megacam), along with an
independent discovery of the type-Ia supernova 2009ly (cf. CBET 2056).  The
spectroscopy for each supernova was obtained on Nov. 24 UT with the MMT and
the Blue Channel Spectrograph; the publicly available Supernova Identification
code of Blondin and Tonry (2007, Ap.J. 666, 1024) was utilized for determining
spectroscopic types.  The objects' discovery magnitudes and spectroscopic
redshifts (z) are tabulated below:

 SN       2009 UT     R.A. (2000.0) Decl.       g'     r'      z
 2009ly   Nov. 19    0 41 12.66  - 9 08 54.7   19.0   18.6    0.05
 2009ml   Oct. 14   23 53 33.47  -10 09 49.9   20.9   21.0    0.21
 2009mm   Oct. 15    2 56 23.61  +41 40 31.6   20.6   20.6    0.17
 2009mn   Oct. 15    6 31 36.88  +25 19 35.9   21.8   21.5    0.25
 2009mo   Oct. 17    9 14 24.15  +15 51 10.3   21.5   20.2    0.07
 2009mp   Oct. 17    9 23 59.78  +14 06 47.7   21.5   20.2    0.13
 2009mq   Nov. 11   23 44 59.82  - 3 59 13.7   20.1   20.1    0.04
 2009mr   Nov. 15   22 25 59.56  +17 13 33.0   20.1   19.5    0.11
 2009ms   Nov. 18   10 39 55.40  +39 48 10.9   20.0   20.0    0.11

     The spectroscopy indicates that SN 2009ly was around 20 days past
maximum on Nov. 24; 2009ly is located 3".7 west and 5".6 north of its host
galaxy (which itself has magnitudes g' = 16.8 and r' = 16.0).
     The Nov. 24 spectroscopy shows that SN 2009ml was around one month past
maximum; Megacam magnitudes from Nov. 11 for 2009ml:  g' = 22.2, r' = 21.4.
SN 2009ml is located 0".1 west and 0".1 north of its host galaxy (which
itself has magnitudes g' = 23.1 and r' = 22.8).
     SN 2009mm is located 0".5 west and 0".7 north of its host galaxy (which
itself has magnitudes g' = 20.8 and r' = 19.9).  SN 2009mm, which was around
one month past maximum from the spectroscopy, had Megacam magnitudes
g' = 22.3, r' = 21.2 on Nov. 15.
     SN 2009mn, which has no visible host galaxy down to limiting r' and g'
magnitudes of about 24, was around two months past maximum at the time of
the spectroscopy; additional Megacam magnitudes from Nov. 14:  g' = 23.4,
r' = 22.2.
     SN 2009mo, which is 0".22 east and 3".26 north of its host galaxy
(which itself has magnitudes g' = 18.2 and r' = 17.6), was around two
months past maximum at the time of the spectroscopy; additional Megacam
magnitudes for 2009mo from Nov. 15:  g' = 22.1, r' = 21.1.
     SN 2009mp is located 0".1 west and 0".2 south of its host galaxy (which
itself has magnitudes g' = 20.1 and r' = 19.2).  SN 2009mp, which was around
one month past maximum from the spectroscopy, had Megacam magnitudes
g' = 22.1, r' = 21.1 on Nov. 15.
     SN 2009mq, which is located 0".2 west and 0".9 north of its host galaxy
(which itself has magnitudes g' = 20.6 and r' = 20.2), was around five days
before maximum at the time of the spectroscopy.
     SN 2009mr, which is located 0".2 east and 0".2 north of its host galaxy
(which itself has magnitudes g' = 17.7 and r' = 16.9), was around one week
past maximum at the time of the spectroscopy.
     SN 2009ms, which was near maximum at the time of the spectroscopy,
appears centered on its host galaxy (which itself has magnitudes g' = 19.1,
r' = 18.6).


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                         (C) Copyright 2009 CBAT
2009 December 22                 (CBET 2089)              Daniel W. E. Green