2005AJ....130.2278G

Query : 2005AJ....130.2278G

2005AJ....130.2278G - Astron. J., 130, 2278-2292 (2005/November-0)

Spectroscopic observations and analysis of the unusual type Ia SN 1999ac.

GARAVINI G., ALDERING G., AMADON A., AMANULLAH R., ASTIER P., BALLAND C., BLANC G., CONLEY A., DAHLEN T., DEUSTUA S.E., ELLIS R., FABBRO S., FADEYEV V., FAN X., FOLATELLI G., FRYE B., GATES E.L., GIBBONS R., GOLDHABER G., GOLDMAN B., GOOBAR A., GROOM D.E., HAISSINSKI J., HARDIN D., HOOK I., HOWELL D.A., KENT S., KIM A.G., KNOP R.A., KOWALSKI M., KUZNETSOVA N., LEE B.C., LIDMAN C., MENDEZ J., MILLER G.J., MONIEZ M., MOUCHET M., MOURAO A., NEWBERG H., NOBILI S., NUGENT P.E., PAIN R., PERDEREAU O., PERLMUTTER S., QUIMBY R., REGNAULT N., RICH J., RICHARDS G.T., RUIZ-LAPUENTE P., SCHAEFER B.E., SCHAHMANECHE K., SMITH E., SPADAFORA A.L., STANISHEV V., THOMAS R.C., WALTON N.A., WANG L., WOOD-VASEY W.M. (The Supernova Cosmology Project)

Abstract (from CDS):

We present optical spectra of the peculiar Type Ia supernova (SN Ia) 1999ac. The data extend from -15 to +42 days with respect to B-band maximum and reveal an event that is unusual in several respects. Prior to B-band maximum, the spectra resemble those of SN 1999aa, a slowly declining event, but possess stronger Si II and Ca II signatures (more characteristic of a spectroscopically normal SN). Spectra after the B-band maximum appear more normal. The expansion velocities inferred from the iron lines appear to be lower than average, whereas the expansion velocity inferred from calcium H and K are higher than average. The expansion velocities inferred from Si II are among the slowest ever observed, although SN 1999ac is not particularly dim. The analysis of the parameters v10(Si II), R(Si II), v{dot}, and Δm15 further underlines the unique characteristics of SN 1999ac. We find convincing evidence of C II λ6580 in the day -15 spectrum with ejection velocity v>16,000 km/s, but this signature disappears by day -9. This rapid evolution at early times highlights the importance of extremely early-time spectroscopy.

Abstract Copyright: ∼

Journal keyword(s): Stars: Supernovae: General - supernovae: individual (SN 1999ac)

Simbad objects: 14

goto Full paper

goto View the references in ADS

Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SN 2000cx SN* 01 24 46.150 +09 30 30.89           SNIap 227 1
2 SN 1999aa SN* 08 27 42.03 +21 29 14.8           SNIap 274 1
3 SN 2002bo SN* 10 18 06.51 +21 49 41.7   13.95       SNIa 325 1
4 SN 1999aw SN* 11 01 36.37 -06 06 31.6   16.88       SNIa 76 1
5 SN 1999bp SN* 11 39 46.42 -08 51 34.8     18.8     SNIa 17 1
6 SN 1998aq SN* 11 56 25.87 +55 07 43.2   12.31 14.9     SNIa 197 1
7 SN 1984A SN* 12 26 55.73 +15 03 17.1   12.40 12.20     SNIa 140 1
8 SN 1994D SN* 12 34 02.395 +07 42 05.70   11.75 12.03     SNIa 559 1
9 SN 1991T SN* 12 34 10.20 +02 39 56.4   11.70 11.51     SNIapec 795 1
10 SN 1990N SN* 12 42 56.68 +13 15 23.4   12.69 12.62     SNIa 406 1
11 SN 1983G SN* 12 52 20.90 -01 12 12.0   12.97       SNIa 110 1
12 SN 2002cx SN* 13 13 49.72 +06 57 31.9   17.68       SNIapec 240 1
13 NGC 6063 AG? 16 07 13.0021003512 +07 58 44.434838856   14.1       ~ 165 0
14 SN 1999ac SN* 16 07 15.01 +07 58 20.4   14.34       SNIap 144 1

To bookmark this query, right click on this link: simbad:objects in 2005AJ....130.2278G and select 'bookmark this link' or equivalent in the popup menu