[vsnet-campaign-sn 435] types of recent SNe

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

Dear SN watchers,

  IAUC 7915 informed the types of two recent SNe, observed by the CfA
team.  These spectra can be seen at:
http://cfa-www.harvard.edu/cfa/oir/Research/supernova/RecentSN.html, 
as well as SN 2002df whose spectrum is not reported in this IAUC.

SN 2002db:
In [vsnet-obs 39935]
>SN2002db  20020510.3 <190:C  KAI
>SN2002db  20020518.3  176:C  KAI
>
># The host galaxy of SN 2002db is NGC 5683, which apparently makes a
># pair with NGC 5682 but NGC 5683 is far beyond.  The reported
># magnitude is near to the expected maximum for typical SN Ia.

This SN has more brightened than expected.  

>  20020510.300  <190C  (KAIT (from IAUC))
>  20020518.300  176:C (KAIT (from IAUC))
>  20020524.728  169C  (Reiki Kushida (from IAUC))
>  20020525.914  162CR  (Pepe Manteca)
>  20020525.955  168R  (Odd Trondal)
>  20020531.942  161:CR (J. Nicolas)

It turned out to be of type Ia, about 2 days before maximum on June
1.29 UT.

SN 2002de:

In [vsnet-campaign-sn 433]:
># This SN appeared in NGC 6104, whose recession velocity is about 8400
># km/s.  The observed magnitude is somewhat brighter than expected
># maximum of normal SN Ia, so spectral classification and followup
># photometry are urged.

It turned out to be also of type Ia, about 4 days before maximum
light on June 2.23 UT.  The Si II 615nm line, characteristic for SN
Ia, is slightly weak, as well as that for SN 2002db.  These features
may suggest that they are somewhat overluminous SN Ia.

SN 2002df:

In [vsnet-campaign-sn 434]:
># MCG -01-53-6, the host galaxy of SN 2002df, is a spiral ((R')Sab)
># galaxy.  The recession velocity has not been measured (as far as
># in NED). 

It is also of type Ia, a week after maximum on June 4 UT.  The
recession velocity of the SN is about 7000 km/s.

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

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