Central Bureau for Astronomical Telegrams
IAUC 7894: 2002cj, 2002ck, 2002cp, 2002cs
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Circular No. 7894
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
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Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVAE 2002cj, 2002ck, 2002cp, 2002cs
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2002cj (cf. IAUC 7882), obtained by M. Calkins on
May 2.43 UT with the F. L. Whipple Observatory 1.5-m telescope (+
FAST spectrograph), shows it to be a type-Ic supernova, similar to
SN 2002cg (cf. IAUC 7881). R. Chornock, W. D. Li, and A. V.
Filippenko, University of California, Berkeley, write that
inspection of CCD spectra (range 330-1000 nm), taken on May 7 with
the Shane 3-m reflector at Lick Observatory, also reveals that SN
2002cj is a type-Ic supernova.
Chornock et al. note that SN 2002ck (IAUC 7884) is of type Ia,
with a spectral-feature age of 5 +/- 2 days past maximum light on
May 7.
Matheson et al. further report that a spectrum of SN 2002cp
(cf. IAUC 7887), obtained as above by P. Berlind on May 3.16 UT,
shows it to be a type-Ib or type-Ic supernova. The spectrum
consists of a blue continuum with several absorption features,
including calcium and what may be incipient helium lines. Chornock
et al. agree that 2002cp (IAUC 7887) is a young supernova of type
Ib or Ic. Further monitoring is encouraged to determine whether or
not the He I absorption lines that are characteristic of type-Ib
supernovae develop.
M. Riello, S. Benetti, G. Altavilla, A. Pastorello, and M.
Turatto, Osservatorio Astronomico di Padova; E. Cappellaro,
Osservatorio Astronomico di Capodimonte; and P. Ruiz-Lapuente,
Barcelona University, communicate that a spectrum (range 325-800
nm) of SN 2002cs (cf. IAUC 7891), obtained on May 7 with the
Telescopio Nazionale Galileo (+ Dolores spectrograph), shows it to
be a type-Ia supernova 2 +/- 2 days before maximum light (from
spectral features); assuming the NASA/IPAC Extragalactic Database
(NED) recession velocity of 4728 km/s for the host galaxy, the
supernova expansion velocity is about 15700 km/s from the Si II
635.5-nm absorption. Matheson et al. confirm that a spectrum of
SN 2002cs, obtained by Calkins on May 7.38, shows it to be a
type-Ia supernova near maximum; also adopting the NED recession
velocity for NGC 6702, they find the supernova expansion velocity
to be about 15900 km/s for Si II (rest 635.5 nm), and the spectral-
feature age of the supernova was determined to be 1 +/- 2 days
before maximum light, for which the high expansion velocity is
unusual. Chornock et al. remark that inspection of CCD spectra,
taken as above at Lick, reveals that SN 2002cs is a supernova of
type Ia, closely resembling SN 1994D near maximum light.
(C) Copyright 2002 CBAT
2002 May 8 (7894) Daniel W. E. Green
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