4 Supernova Discoveries
ATel #1148; The Nearby Supernova Factory: G. Aldering, C. Aragon, S. Bailey, S. Bongard, M. Childress, S. Loken, P. Nugent, S. Perlmutter, K. Runge, R. C. Thomas, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Baltay, A. Bauer, D. Rabinowitz, R. Scalzo (Yale University, New Haven, CT), G. Rigaudier, E. Pecontal (Centre de Recherche Astronomique de Lyon), C. Buton, Y. Copin, E. Gangler, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, R. Pain, R. Pereira, C. Wu (Laboratoire de Physique Nucleaire et de Haute Energies de Paris) ; and D. Birchall (Institute for Astronomy, University of Hawaii, Hilo, HI); and J. Holtzman (New Mexico State University, Las Cruces, NM)
on 19 Jul 2007; 23:17 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: R. C. Thomas (rcthomas@lbl.gov)
Subjects: Infra-Red, Optical, Ultra-Violet, Supernovae
The Nearby Supernova Factory reports the discovery of 4 supernovae in images obtained Jul 18 UTC using the QUEST-II camera on the Palomar Oschin 48-inch telescope, operated by the Palomar-QUEST Consortium. Spectra (range 320-1000 nm) obtained with the SuperNova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope were used to classify each. R-band discovery magnitudes and J2000.0 coordinates are derived from comparison with the USNO-B1.0 catalog. The following table summarizes the discovered supernovae (dates are UTC).
Target Name RA Decl Disc Date Disc Mag Spec Date Type Redshift Phase
SNF20070718-007 14:47:49.47 29:30:16.5 Jul 18.2 20.0 Jul 19.3 II 0.05
SNF20070718-018 16:02:05.41 29:43:34.8 Jul 18.2 16.5 Jul 19.3 II 0.01
SNF20070718-025 22:22:07.95 -14:18:48.3 Jul 18.3 19.0 Jul 19.5 II 0.03
SNF20070718-026 22:42:37.33 28:18:56.4 Jul 18.5 19.4 Jul 19.5 Ia 0.10 Around max
The spectrum of SNF20070718-018 indicates that it is potentially a very young Type II SN, with a very blue continuum and immature hydrogen features. There are numerous narrow, unidentified features blueward of 5000 AA rest-frame, and a P-Cygni feature with an apparent peak at 5800 AA, probably too far to the blue to be He I 5876. A redshift of z = 0.0142 is measured by cross-correlating the host spectrum observed in the integral field unit with an Sa-type galaxy template.
