Electronic Telegram No. 745
Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html
SUPERNOVAE 2006ob-2006op
Further to CBETs 611 and 743, B. Bassett, South African Astronomical
Observatory (SAAO); A. Becker, University of Washington (UW); H. Brewington,
Apache Point Observatory (APO); C. Choi, Seoul National University (SNU);
D. Cinabro, Wayne State University; F. DeJongh, Fermilab; J. Dembicky, APO;
D. L. DePoy, Ohio State University (OSU); B. Dilday, University of Chicago
(UC); M. Doi, University of Tokyo (UoT); J. Frieman, Fermilab and UC; P.
Garnavich, University of Notre Dame; M. Harvanek, APO; C. Hogan, UW; J.
Holtzman, New Mexico State University; M. Im, SNU; S. Jha, Stanford
University (SU); K. Konishi, UoT; J. Krzesinski, APO; H. Lampeitl, Space
Telescope Science Institute (STScI); R. Kessler, UC; B. Ketzeback, D. Long,
O. Malanushenko, and V. Malanushenko, APO; J. Marriner and D. McGinnis,
Fermilab; R. McMillan, APO; G. Miknaitis, Fermilab; T. Morokuma, UoT; R.
Nichol, University of Portsmouth (UP); K. Pan, APO; J. L. Prieto, OSU; M.
Richmond, Rochester Institute of Technology; A. Riess, STScI; R. Romani, SU;
M. Sako, University of Pennsylvania; G. Saurage, APO; D. Schneider,
Pennsylvania State University; M. Smith, UP; S. Snedden, APO; N. Takanashi
and K. Tokita, UoT; K. van der Heyden, SAAO; S. Watters, APO; C. Wheeler,
University of Texas; N. Yasuda, UoT; and C. Zheng, SU, on behalf of the Sloan
Digital Sky Survey II collaboration, report the discovery of fourteen new
supernovae on multiple g, r, and i images taken with the SDSS 2.5-m telescope
at APO by the SDSS observing team, thirteen of them confirmed as type-Ia
events and the other a probable type-Ia supernova. Romani, Zheng, Sako,
Wheeler, and Schneider, together with U. Hopp (University of Munich) and W.
Kollatschny (University of Goettingen), report that spectroscopic
observations with the Hobby Eberly Telescope on Nov. 18 and 19 UT indicate
that 2006oc, 2006oj, 2006oo, and 2006oe are type-Ia supernovae.
Spectroscopic observations on Nov. 18 and 19 with the Kitt Peak National
Observatory 4-m reflector by P. Garnavich, M. Florack, A. Hirschauer, and D.
O'Connor (all at the University of Notre Dame) showed that 2006om, 2006od,
2006og, and 2006oi are type-Ia supernovae. J. Eastman, J. L. Prieto, L.
Watson, R. Assef, K. Schlesinger, and D. DePoy, OSU; and A. Crotts, Columbia
University, report that spectroscopic observations by C. Morgan (OSU and U.S.
Naval Observatory), and M. Eyler (USNO) with the Hiltner 2.4-m telescope at
MDM Observatory on Nov. 17, 18, and 19 indicate that 2006ol, 2006on, 2006oh,
2006of, and 2006ok are type-Ia supernovae and that 2006op is a probable
type-Ia supernova. In addition, CBET 743 mistakenly reported that the
spectrum of SN 2006ob was similar to that of SN 1991bg; in fact, it appears
to be a normal type-Ia event. The discovery magnitudes tabulated below are
all SDSS g magnitudes. Spectroscopic redshifts are given in the column
labelled "z". Peak dates (all 2006) are approximate estimates from early
fits to the multi-band light curves or from the spectra.
SN Discov. R.A. (2000.0) Decl. Mag. z Estimated
Date UT Peak Date
2006oc Oct. 17 23 02 48.35 - 0 52 35.1 22.3 0.27 Oct. 28
2006od Oct. 23 2 07 54.31 - 0 32 07.4 22.1 0.17 Nov. 4
2006oe Oct. 28 23 21 27.00 + 1 07 56.9 22.0 0.34 Nov. 1
2006of Oct. 29 0 32 25.86 - 1 03 14.4 21.5 0.16 Nov. 10
2006og Oct. 29 20 12 04.27 + 0 34 14.2 21.8 0.16 Nov. 11
2006oh Oct. 29 23 41 12.48 - 1 06 20.9 22.2 0.16 Nov. 15
2006oi Oct. 31 0 35 53.05 + 0 15 30.3 22.3 0.20 Nov. 12
2006oj Oct. 31 1 08 49.30 - 0 59 22.4 22.2 0.34 Nov. 1
2006ok Nov. 1 1 07 28.34 - 0 16 09.7 21.8 0.10 Nov. 14
2006ol Nov. 1 23 28 07.19 + 0 51 22.9 21.6 0.12 Nov. 12
2006om Nov. 8 1 22 18.88 + 1 00 38.2 21.5 0.16 Nov. 19
2006on Nov. 11 21 55 58.49 - 1 04 12.7 20.7 0.07 Nov. 26
2006oo Nov. 11 21 59 47.23 - 0 43 59.6 22.1 0.28 Nov. 19
2006op Nov. 17 21 21 31.86 + 0 59 35.9 21.6 0.03 Nov. 25
M. Baek and W. Li report the independent LOSS (cf. IAUC 8771)
discovery of 2006ob on unfiltered KAIT images taken on Nov. 18.29 (at mag
17.9) and 19.31 UT (mag 17.6). Their measured position for 2006ob is
R.A. = 1h51m48s.11, Decl. = +0o15'48".3 (equinox 2000.0), which is 5".5
west and 1".6 south of the center of UGC 1333. KAIT images taken on Oct.
29.30 (limiting mag 18.9) and Nov. 7.31 (limiting mag 18.5) showed
nothing at the position of 2006ob.
P. Garnavich, A. Hirschauer, and M. Florack, University of Notre
Dame, report that a spectrum of SN 2006ob was obtained with the Kitt
Peak 4-m Mayall telescope (+ R-C spectrograph) on Nov. 19.22 UT in poor
seeing. The spectrum shows strong Si II absorption and other features
characteristic of an early type-Ia supernova. Comparison of the spectrum
of 2006ob with other supernovae spectra in the CfA Supernova Archive
(http://cfa-www.harvard.edu/oir/Research/supernova/SNarchive.html)
shows an excellent match with SN 1994D at four days before maximum light.
The Ca II absorption is seen with two minima and suggests a high velocity
component, as in SN 1994D (Branch et al. 2005, PASP 117, 545).
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Host galaxy info: vel =17759 km/s; 0.8 x 0.7; 15.1g; Sb:
SN type info: Ia
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