[vsnet-campaign-sn 508] SN Ib 2002hy

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

Dear SN watchers,

In [vsnet-campaign-sn 505] (Nov. 16):
>SN2002hy  20021013.104 <180CR   MLF
>SN2002hy  20021112.098  164:CR  MLF
>SN2002hy  20021114.084  164:CR  MLF
>
># NGC 3464, a host galaxy of SN 2002hy (10:54:39.18, -21:03:41.2
># (J2000.0), offset = 15"W, 17"N), has also produced SN Ic 2002J 
># (reported brightest mag = 16.4) in this January (vsnet-alert 7079).
># NGC 3464 is an open spiral (SAB(rs)c) galaxy, and SN is superimposed
># on the inner northern arm.  
>#
># There are several foreground stars superimposed or bright knots in
># the host galaxy.  The brightest one is mag 16 star about 1' WNW of
># the nucleus.  Another mag 17 object can be seen about 40" SSW of the
># nucleus. 
>#
># It seems to be a rather bright core-collapse event (like as SN Ic)
># or a somewhat reddened SN Ia near the maximum light.  Conratulations
># for the discovery, Berto!  

  According to IAUC 8019, the ESO team has revealed that it is a
peculiar type-Ib supernova soon after explosion.  He I lines are
prominent, and they have P-Cyg profiles (v_exp about 9500 km/s derived
from He I 587.5 nm absorption minimum).  Narrow H-alpha and H-beta
absorption lines are identified at v_exp about 16000 km/s, which are
probably made by the outermost thin hydrogen-rich layer.  It is
considerably reddened (E(B-V) about 0.17), so its luminosity is
somewhat larger than normal SN Ib.  Further follow-up photometry are
urged. 

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

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