J/ApJ/689/377 SNe Ia as NIR standard candles from PAIRITEL (Wood-Vasey+, 2008)
Type Ia supernovae are good standard candles in the near infrared: evidence
from PAIRITEL.
Wood-Vasey W.M., Friedman A.S., Bloom J.S., Hicken M., Modjaz M.,
Kirshner R.P., Starr D.L., Blake C.H., Falco E.E., Szentgyorgyi A.H.,
Challis P., Blondin S., Mandel K.S., Rest A.
<Astrophys. J., 689, 377-390 (2008)>
=2008ApJ...689..377W 2008ApJ...689..377W
ADC_Keywords: Photometry, infrared ; Supernovae
Keywords: distance scale - supernovae: general
Abstract:
We have obtained 1087 NIR (JHKs) measurements of 21 SNe Ia using
PAIRITEL, nearly doubling the number of well-sampled NIR SN Ia light
curves. These data strengthen the evidence that SNe Ia are excellent
standard candles in the NIR, even without correction for optical
light-curve shape. We construct fiducial NIR templates for normal SNe
Ia from our sample, excluding only the three known peculiar SNe Ia: SN
2005bl, SN 2005hk, and SN 2005ke. The H-band absolute magnitudes in
this sample of 18 SNe Ia have an intrinsic rms of only 0.15mag with
no correction for light-curve shape. We found a relationship between
the H-band extinction and optical color excess of AH=0.2E(B-V).
This variation is as small as the scatter in distance modulus
measurements currently used for cosmology based on optical light
curves after corrections for light-curve shape. Combining the
homogeneous PAIRITEL measurements with 23 SNe Ia from the literature,
these 41 SNe Ia have standard H-band magnitudes with an rms scatter
of 0.16mag. The good match of our sample with the literature sample
suggests there are few systematic problems with the photometry.
Description:
We present 1087 near-infrared (JHKs; 1.2,1.6,2.2um) measurements with
a signal-to-noise ratio (S/N)>3 of 21 nearby SNe Ia obtained from 2005
to 2007 using the f/13.5 1.3m PAIRITEL (wich uses the northern
telescope of the 2MASS) at the F. L. Whipple Observatory on Mount
Hopkins in Arizona (see table 1).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 60 47 SN Ia JHKs peak magnitudes
table2.dat 40 1785 Light curve table
table3.dat 70 47 Apparent standard H-band magnitudes of Type Ia
supernovae
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See also:
II/189 : Magnitude Observations of Type I Supernovae (Cadonau+ 1990)
J/A+A/317/423 : Revised photometry of SNIa (Patat, 1997)
J/MNRAS/369/1880 : Photometry of SN 2003cg (Elias-Rosa+, 2006)
J/ApJ/645/488 : SN type Ia luminosities (Wang+, 2006)
J/MNRAS/377/1531 : Optical + infrared photometry of SN 2004eo (Pastorello+,
2007)
J/MNRAS/376/1301 : UBVRI light-curves of SN 2005cf (Pastorello+, 2007)
J/MNRAS/384/107 : VRIJHK photometry of SN 2002cv (Elias-Rosa+, 2008)
J/A+A/477/717 : Spectroscopy of Type Ia supernovae (Bronder+, 2008)
J/A+A/523/A7 : Light curves of type Ia supernovae in SNLS (Guy+, 2010)
J/ApJS/190/418 : Light curves for 165 SNe (Ganeshalingam+, 2010)
J/MNRAS/406/782 : Type Ia supernovae luminosities (Sullivan+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [SN]
4- 9 A6 --- SN Supernova designation
11 A1 --- f_SN [c] excluded SN (1)
13- 17 F5.2 mag Jpk ? J-band peak magnitude (2)
19- 22 F4.2 mag e_Jpk ? Jpk uncertainty
24- 28 F5.2 mag Hpk ? H-band peak magnitude (2)
30- 33 F4.2 mag e_Hpk ? Hpk uncertainty
35- 39 F5.2 mag Kspk ? Ks-band peak magnitude (2)
41- 44 F4.2 mag e_Kspk ? Kspk uncertainty
46- 47 I2 --- NJ ? Number of epochs in J light curve (3)
49- 50 I2 --- NH ? Number of epochs in H light curve (3)
52- 53 I2 --- NKs ? Number of epochs in Ks light curve (3)
55- 59 A5 --- Ref Reference(s) (4)
60 A1 --- f_Ref [d] reference not used (5)
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Note (1): The fast-declining, unusual SN 2005bl, SN 2005hk, and SN 2005ke were
excluded from the template generation. When fit with the H-band
template they are clearly rejected as outliers with χ2/dof>3.
See Fig. 3 for a visual comparison of the H-band light curves of these
dromedary SNe Ia compared with the H-band template.
Note (2): Magnitudes of the maximum observed magnitude in JHKs. Magnitude errors
are 1σ symmetric errors.
Note (3): Number of epochs with S/N>3 in the JHKs light curves, respectively.
Note (4): References as follows:
1 = PAIRITEL photometry; this paper;
2 = Jha et al. 1999ApJS..125...73J 1999ApJS..125...73J;
3 = Hernandez et al. 2000MNRAS.319..223H 2000MNRAS.319..223H;
4 = Krisciunas et al. 2000ApJ...539..658K 2000ApJ...539..658K;
5 = Di Paola et al. 2002A&A...393L..21D 2002A&A...393L..21D;
6 = Valentini et al. 2003ApJ...595..779V 2003ApJ...595..779V;
7 = Krisciunas et al. 2003AJ....125..166K 2003AJ....125..166K;
8 = Krisciunas et al. 2004ApJ...602L..81K 2004ApJ...602L..81K;
9 = Krisciunas et al. 2004AJ....127.1664K 2004AJ....127.1664K;
10 = Krisciunas et al. 2007AJ....133...58K 2007AJ....133...58K;
11 = Elias-Rosa et al. 2006, Cat. J/MNRAS/369/1880;
12 = Elias-Rosa et al. 2008, Cat. J/MNRAS/384/107;
13 = Pastorello et al. 2007, Cat. J/MNRAS/377/1531;
14 = Stanishev et al. 2007A&A...469..645S 2007A&A...469..645S;
15 = Pignata et al. 2008MNRAS.388..971P 2008MNRAS.388..971P;
16 = Krisciunas et al. 2001AJ....122.1616K 2001AJ....122.1616K;
17 = Taubenberger et al. 2008MNRAS.385...75T 2008MNRAS.385...75T
Note (5): Because we had data from PAIRITEL on these SNe Ia we did not take
advantage of the photometry of SN 2005cf provided in Pastorello et al.
(2007, Cat. J/MNRAS/376/1301) or that of SN 2006X provided in Wang et
al. (2008ApJ...675..626W 2008ApJ...675..626W).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [SN]
4- 9 A6 --- SN Supernova designation
11- 19 F9.3 d MJD Modified Julian Date of observation
21- 22 A2 --- Filt Filter passband of observation (H, J, K, Ks)
24- 31 F8.2 --- F25 Flux normalized to a zeropoint of 25 (1)
33- 40 F8.2 --- e_F25 Error in F25
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Note (1): i.e. the calibrated 2MASS magnitude is mag=-2.5log10(flux)+25.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- --- [SN]
4- 9 A6 --- SN Supernova designation
11- 15 I5 km/s cz ? NED host galaxy redshift corrected (1)
17- 20 I4 km/s e_cz ? cz uncertainty
22- 26 F5.3 mag e_mu ? Distance modulus uncertainty (2)
28- 34 F7.1 d tBmax ? MJD time of B-band maximum
36- 40 F5.2 mag HBmax ? H-band apparent magnitude at B-band maximum
corrected from extinction (3)
42- 45 F4.2 mag e_HBmax ? HBmax uncertainty
47- 51 F5.2 mag chi2 ? χ2/dof
53- 54 I2 --- dof ? Number of degrees of freedom (4)
56- 59 F4.2 --- AV ? Visual absorption
61- 65 F5.2 mag mu ? Distance modulus (5)
67- 70 F4.2 --- sigma ? Quadrature sum (6)
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Note (1): Redshift of host galaxies as corrected to CMB frame with the
additional correction of Virgo member NGC 4501 (host of SN 1999cl)
from its observed CMB-corrected recession velocity (2281km/s) to the
mean recession velocity of Virgo (957km/s).
Note (2): A peculiar velocity (σvel) of 150km/s and the individual
redshift measurement uncertainty of e_cz was converted into an
equivalent distance modulus uncertainty using Eq. (1):
σµ(vel)=5/zln10((σvel/c)2+σz2)^0.5
See section 5 for further details.
Note (3): An H-band extinction correction of AH=0.06AV has been applied to
the magnitudes obtained by fitting to the template. See section 6 for
details.
Note (4): The number of degrees of freedom (dof) is the number of H-band data
points minus 1 for the overall offset fit parameter, HBmax.
Note (5): µ=HBmax-MHBmax where MHBmax is the absolute H-band
magnitude of a SN Ia at B-band maximum light. Assuming H0=72km/s/Mpc
and thus MH=-18.07±0.03mag.
Note (6): Quadrature sum of peculiar velocity distance modulus uncertainty (col.
sigmu) and fit uncertainty (col. e_HBmax).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 21-Jan-2011