[vsnet-campaign-sn 471] spectral types for recent SNe

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

Dear SN watchers,

  IAUC 7964 and 7965 informed the classifications of some recent SNe.

SN 2002em:
In [vsnet-obs 40965] (posted on Aug. 18)
>SN2002em  20020406.0  <190C  ARM
>SN2002em  20020816.07  180C  ARM
>SN2002em  20020816.95  180C  Arm
>
># UGC 3430, the host galaxy of SN 2002em, is a spiral galaxy, somewhat
># affected by the intersteller extinction.  The expected maximum for
># typical SN Ia is mag about 15.8.  This galaxy also produced SN Ia
># 1996bn, which was discovered at mag about 18, probably 1 month after
># maximum.

It is of type II, probably type IIn. 

SN 2002en: 
In [vsnet-obs 40992] (posted on Aug. 20)
>SN2002en  20020812.3 <190:C  KAI
>SN2002en  20020818.3  183:C  KAI
>SN2002en  20020819.3  183:C  KAI
>
># UGC 12289, the host galaxy of SN 2002en, is a distant spiral (Sd)
># galaxy.  The expected maximum for typical SN Ia is mag about 17.8.

The UCB team has revealed that it is SN II.

SN 2002eo:
In [vsnet-campaign-sn 465] (posted on Aug. 24)
>SN2002eo  20020814.4 <190:C  KAI
>SN2002eo  20020820.5  180:C  KAI
>SN2002eo  20020821.5  180:C  KAI
>
># NGC 710, the host galaxy of SN 2002eo, is a disturbed spiral (Scd:)
># galaxy.  The expected maximum for typical SN Ia is mag about 16.5.
and In [vsnet-obs 41074] (Aug. 29)
>SN2002eo  20020814.077  <195C  ARM
>SN2002eo  20020818.023   185:C ARM
>SN2002eo  20020823.089   182:C ARM

The Asiago team and the UCB team report that it is type II SN.  

SN 2002ep:
In [vsnet-campaign-sn 466] (posted on Aug. 27)
>SN2002ep  20020713.0  <205C  PAL
>SN2002ep  20020723.0  <205C  PAL
>SN2002ep  20020806.47  187C  PAL
>SN2002ep  20020807.5   187C  PAL
>SN2002ep  20020817.4   190C  PAL
>
># An apparent host galaxy of SN 2002ep is 2MASXi J2157220-075125,
># which is possibly a member of Abell 2399.  The SN is located on 5"
># due west of the center of the host galaxy.  If the membership is 
># correct, the expected maximum for typical SN Ia is mag about 18.6.

It is type Ia SN, about a month past maximum on Sept. 3.

SN 2002es:
In [vsnet-campaign-sn 466] (Aug. 27)
>SN2002es  20020215.2 <190:C  KAI
>SN2002es  20020812.5  185:C  KAI
>SN2002es  20020823.5  164:C  KAI
>SN2002es  20020824.5  163:C  KAI
>
># UGC 2708, the host galaxy of SN 2002es (offset 19"W, 25"N), is a
># lenticular (S0) galaxy, which produce SN Ia only.  The reported
># magnitude is consistent with the expected maximum for typical SN Ia.

The UCB team and the CfA team suggest that its spectrum resembles that
of subluminous SN Ia, with a quite low (~6000 km/s) expansion velocity.

SN 2002eu:
In [vsnet-obs 41120] (Sept. 1)
>SN2002eu  20020820.4 <190:C  KAI
>SN2002eu  20020825.4  188:C  KAI
>SN2002eu  20020830.4  174:C  KAI
>
># The host galaxy of SN 2002eu is LEDA 212843 = 2MASXi J0149427+323730. 
># The recession velocity of the host galaxy is 11280 km/s, so the
># discovery magniture (174:C) is consistent to the expected maximum
># for typical SN Ia.

The CfA team shows that it is type Ia SN about a week past maximum on
Sept. 3.  The UCB team says that the Si II 580-nm feature suggest that
it would be subluminous, but Ti II 420-nm absorption which is typical
for subluminous SN Ia is absent. 

# I have commented about SNe 2002es and 2002eu on Sept. 4, but the
# article seems to be sleeping in the queue of the VSNET server....

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp