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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
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; 3 = Hernandez et al. 2000MNRAS.319..223H; 4 = Krisciunas et al. 2000ApJ...539..658K; 5 = Di Paola et al. 2002A&A...393L..21D; 6 = Valentini et al. 2003ApJ...595..779V; 7 = Krisciunas et al. 2003AJ....125..166K; 8 = Krisciunas et al. 2004ApJ...602L..81K; 9 = Krisciunas et al. 2004AJ....127.1664K; 10 = Krisciunas et al. 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; 15 = Pignata et al. 2008MNRAS.388..971P; 16 = Krisciunas et al. 2001AJ....122.1616K; 17 = Taubenberger et al. 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).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
Note (1): i.e. the calibrated 2MASS magnitude is mag=-2.5log10(flux)+25.
Byte-by-byte Description of file: table3.dat
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)
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).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 21-Jan-2011
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