Central Bureau for Astronomical Telegrams
IAUC 8142: 2003fa NEAR MCG +07-36-33; 2003em, 2003ev, 2003ey,, 2003ez
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Circular No. 8142
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2003fa NEAR MCG +07-36-33
T. Matheson, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 370-750 nm)
of the variable star near MCG +07-36-33 (cf. IAUC 8140), obtained
by P. Berlind on June 5.42 UT with the Mt. Hopkins 1.5-m telescope
(+ FAST), shows it to be a type-Ia supernova well before maximum.
The NASA/IPAC Extragalactic Database (NED) recession velocity for
MCG +07-36-33 is 1800 km/s, which is inconsistent with the observed
spectrum. Comparison with early-time spectra of SN 2001V indicates
that the recession velocity of the supernova is 10000-15000 km/s
and that it is 10-14 days before maximum.
SUPERNOVAE 2003em, 2003ev, 2003ey, AND 2003ez
M. Hamuy and M. Phillips, Carnegie Observatories, report that
a spectrum (range 370-900 nm) of SN 2003em (cf. IAUC 8137),
obtained on June 4.42 UT with the Las Campanas Observatory Clay
6.5-m telescope (+ LDSS-2), shows it to be a type-Ia supernova,
about 40 days past maximum. A spectrum of SN 2003ev (cf. IAUC
8140), obtained on June 4.19, shows a relatively featureless red
continuum with broad undulations. The main features are broad
emissions near H_alpha and 457 nm, with a trough centered around
570 nm that is possibly due to He I and Na I D. These features are
consistent with a highly reddened young type-Ic supernova, but a
definitive classification will require additional observations.
Superimposed narrow emission H_alpha emission from the host galaxy
yields a redshift of 0.024. A spectrum of SN 2003ey (cf. IAUC
8141), obtained on June 4.27, shows it to be a type-Ia supernova,
with strong resemblance to the spectrum of SN 1994D taken 5 days
past maximum (the comparison yielding a redshift of approximately
0.065 for SN 2003ey). A spectrum of SN 2003ez (cf. IAUC 8141),
taken on June 4.13, shows it to bea type-Ia supernova, bearing
strong resemblance to the spectrum of SN 1994D taken 3 days before
maximum, although the Si II 635.5-nm feature in SN 2003ez is
weaker; the minimum of this line yields an expansion velocity of
-10200 km/s (by adopting the NED host-galaxy recession velocity of
14343 km/s).
H. Yamaoka, Kyushu University, reports that K. Ayani found SN
2003ez at R about 17.4 on an image obtained with the Bisei
Astronomical Observatory 1.01-m telescope on June 4.53 UT. Despite
some saturation of the image, Yamaoka adds that SN 2003ez does not
appear present on a Digitized Sky Survey image.
(C) Copyright 2003 CBAT
2003 June 6 (8142) Daniel W. E. Green
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