2009A&A...500L..17B

Query : 2009A&A...500L..17B

2009A&A...500L..17B - Astronomy and Astrophysics, volume 500L17-20 (2009/6-3)

Using spectral flux ratios to standardize SN Ia luminosities.

BAILEY S., ALDERING G., ANTILOGUS P., ARAGON C., BALTAY C., BONGARD S., BUTON C., CHILDRESS M., CHOTARD N., COPIN Y., GANGLER E., LOKEN S., NUGENT P., PAIN R., PECONTAL E., PEREIRA R., PERLMUTTER S., RABINOWITZ D., RIGAUDIER G., RUNGE K., SCALZO R., SMADJA G., SWIFT H., TAO C., THOMAS R.C., WU C. (The Nearby Supernova Factory)

Abstract (from CDS):

We present a new method to standardize type Ia supernova (SN Ia) luminosities to ≲0.13mag using flux ratios from a single flux-calibrated spectrum per SN. Using Nearby Supernova Factory spectrophotomery of 58 SNe Ia, we performed an unbiased search for flux ratios that correlate with SN Ia luminosity. After developing the method and selecting the best ratios from a training sample, we verified the results on a separate validation sample and with data from the literature. We identified multiple flux ratios whose correlations with luminosity are stronger than those of light curve shape and color, previously identified spectral feature ratios, or equivalent width measurements. In particular, the flux ratio R642/443=F(642nm)/F(443nm) has a correlation of 0.95 with SN Ia absolute magnitudes. Using this single ratio as a correction factor produces a Hubble diagram with a residual scatter standard deviation of 0.125 ±0.011mag, compared with 0.161 ±0.015mag when fit with the SALT2 light curve shape and color parameters x1 and c. The ratio R642/443 is an effective correction factor for both extrinsic dust reddening and instrinsic variations such as those of SN 1991T-like and SN 1999aa-like SNe. When combined with broad-band color measurements, spectral flux ratios can standardize SN Ia magnitudes to ∼0.12mag. These are the first spectral metrics that give robust improvements over the standard normalization methods based upon light curve shape and color, and they provide among the lowest scatter Hubble diagrams ever published.

Abstract Copyright: ∼

Journal keyword(s): stars: supernovae: general - cosmology: observations

VizieR on-line data: <Available at CDS (J/A+A/500/L17): table1.dat table2.dat table3.dat>

Simbad objects: 74

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Number of rows : 74
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 SNF 20070810-004 SN* 00 04 57.40 -06 21 11.8           SNIa 6 0
2 SNF 20071021-000 SN* 00 15 00.089 +16 19 59.35           SNIa 17 1
3 2MASS J00361352+0710005 SN* 00 36 13.5318682992 +07 10 00.640920180           SNIa 5 0
4 SNF 20061020-000 SN* 00 41 05.1 +06 47 44           SNIa 8 0
5 SN 1998de SN* 00 48 06.88 +27 37 28.5   17.56       SNIapec 92 1
6 2MASS J00524509-0817119 SN* 00 52 45.1100421936 -08 17 11.908113792           SNIa 3 0
7 SNF 20080720-001 SN* 01 05 27.31 +37 51 07.9           SNIa 10 0
8 SN 2000dk SN* 01 07 23.52 +32 24 23.2   15.63 15.2     SNIa 109 1
9 SNF 20070818-001 SN* 01 10 55.27 -06 27 09.0           SNIa 6 0
10 SN 1999ej SN* 01 22 57.38 +33 27 58.0   15.65       SNIa 77 1
11 SN 1998es SN* 01 37 17.60 +05 52 50.6   13.99       SNIapec 128 1
12 SNF 20070817-003 SN* 01 37 36.98 -09 11 40.5           SNIa 8 0
13 SN 2005hc SN* 01 56 47.976 -00 12 48.62           SNIa 99 1
14 SNF 20060919-007 SN* 02 29 18.0 -02 12 46           SNIa 2 0
15 SN 2007kk SN* 03 42 23.258 +39 14 30.30     18.3     SNIa 45 1
16 SN 1998ec SN* 06 53 06.11 +50 02 22.1   16.16       SNIa 60 1
17 SN 2000fa SN* 07 15 29.88 +23 25 42.4   15.85       SNIa 90 1
18 SN 1999aa SN* 08 27 42.03 +21 29 14.8           SNIap 274 1
19 SN 2007bd SN* 08 31 33.281 -01 11 57.98           SNIa 100 1
20 SN 1999gd SN* 08 38 24.61 +25 45 33.1   16.94       SNIa 72 1
21 SN 2005M SN* 09 37 32.76 +23 12 10.0     18.8     SNIa 91 1
22 SNF 20070403-001 SN* 10 05 44.1 +18 19 03           SNIa 3 0
23 2MASS J10560374+2808376 SN* 10 56 03.7529134104 +28 08 37.540503132           SNIa 3 0
24 SNF 20080516-000 SN* 11 22 29.76 +56 24 27.0           SNIa 5 0
25 SN 1998aq SN* 11 56 25.87 +55 07 43.2   12.31 14.9     SNIa 197 1
26 SN 1999cl SN* 12 31 56.01 +14 25 35.3   14.92       SNIa 125 1
27 SNF 20080514-002 SN* 13 29 12.84 +11 16 20.5           SNIa 47 0
28 SNF 20080522-000 SN* 13 36 47.61 +05 08 32.6           SNIa 26 0
29 SNF 20080510-005 SN* 13 38 24.60 +09 40 09.1           SNIa 4 0
30 SNF 20080614-010 SN* 14 26 53.08 +23 56 11.0           SNIa 5 0
31 SNF 20070531-011 SN* 14 42 51.48 +08 45 31.6           SNIa 5 0
32 SNF 20060526-003 SN* 14 43 02.5 -18 52 37           SNIa 6 0
33 SNF 20080510-001 SN* 14 56 13.27 +18 51 14.4           SNIa 6 0
34 SNF 20070424-003 SN* 14 57 54.52 +18 36 20.8           SNIa 5 0
35 SNF 20080516-022 SN* 14 59 27.0 +58 00 06           SNIa 4 0
36 SNF 20070506-006 SN* 15 09 34.63 +04 52 28.9           SNIa 9 0
37 SNF 20080610-000 SN* 15 13 49.27 +01 51 50.7           SNIa 5 0
38 SNF 20080522-011 SN* 15 19 58.94 +04 54 16.5           SNIa 25 0
39 SN 1999cc SN* 16 02 42.03 +37 21 34.4   16.78       SNIa 83 1
40 SN 1999ac SN* 16 07 15.01 +07 58 20.4   14.34       SNIap 144 1
41 SN 2008cl SN* 16 11 04.349 +52 27 07.99           SNIa 20 1
42 SNF 20080323-009 SN* 16 11 20.2 +52 50 37           SNIa 3 0
43 SNF 20070727-016 SN* 16 14 30.1 +56 04 11           SNIa 4 0
44 SNF 20070802-000 SN* 16 14 51.6 +56 23 56           SNIa 6 0
45 SNF 20080612-003 SN* 16 15 28.72 +19 13 32.8           SNIa 6 1
46 SNF 20080531-000 SN* 16 17 00.0 +19 07 05           SNIa 6 0
47 SNF 20070712-003 SN* 16 42 40.36 +50 35 50.2           SNIa 5 0
48 SN 2008eq SN* 17 00 07.200 +23 07 56.60           SNIa 22 1
49 SNF 20070717-003 SN* 17 26 18.98 +23 08 03.8           SNIa 4 0
50 SNF 20080810-001 SN* 17 39 37.77 +37 52 03.7           SNIa 6 0
51 SN 1998bp SN* 17 54 50.74 +18 19 50.5   15.73       SNIa 77 1
52 SNF 20080623-001 SN* 18 11 39.79 +50 10 56.2           SNIa 9 0
53 SN 1998V SN* 18 22 37.40 +15 42 08.4   15.07       SNIa 72 1
54 SNF 20060511-014 SN* 21 00 32.06 -24 37 02.2           SNIa 4 0
55 SNF 20070725-001 SN* 21 05 01.84 +08 16 24.6           SNIa 4 0
56 SNF 20060621-015 SN* 21 15 32.01 -13 24 05.4           SNIa 6 0
57 SNF 20070806-026 SN* 21 53 52.686 +04 29 54.47           SNIa 4 0
58 SN 2007cq SN* 22 14 40.41 +05 04 48.6     15.8     SNIa 72 1
59 SN 2005di SN* 22 25 33.96 -24 14 29.0     18.6     SNIa 15 1
60 SNF 20070803-005 SN* 22 26 23.66 +21 15 05.7           SNIa 7 0
61 SN 1998eg SN* 22 39 30.29 +08 36 20.6   16.11       SNIa 68 1
62 SN 2004ef SN* 22 42 10.020 +19 59 39.88           SNIa 107 1
63 SNF 20080626-002 SN* 22 45 02.47 +08 56 35.8           SNIa 5 0
64 SN 2008ec SN* 23 03 16.560 +08 52 19.81           SNIa 64 1
65 SNF 20071015-000 SN* 23 05 34.08 +09 07 15.2           SNIa 6 0
66 SNF 20061111-002 SN* 23 07 18.69 -13 31 07.3           SNIa 5 0
67 SN 1998dh SN* 23 14 40.31 +04 32 14.1   13.85       SNIa 92 1
68 SNF 20070701-005 SN* 23 25 08.6 -09 58 46           SNIa 9 0
69 SNF 20070630-006 SN* 23 35 27.50 +19 13 25.6           SNIa 5 0
70 SN 2006dm SN* 23 41 47.839 -03 40 08.40     17.3     SNIa 43 1
71 SNF 20080822-005 SN* 23 49 21.98 +19 12 23.0           SNIa 4 0
72 SNF 20080714-008 SN* 23 51 37.53 +20 08 20.7           SNIa 4 0
73 SN 2007qe SN* 23 54 12.98 +27 24 33.0     17.4     SNIa 52 1
74 SNF 20060908-004 SN* ~ ~           SNIa 2 0

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