J/ApJS/200/12 CfA4: light curves for 94 type Ia SNe (Hicken+, 2012)
CfA4: light curves for 94 type Ia supernovae. Hicken M., Challis P., Kirshner R.P., Rest A., Cramer C.E., Wood-Vasey W.M., Bakos G., Berlind P., Brown W.R., Caldwell N., Calkins M., Currie T., De Kleer K., Esquerdo G., Everett M., Falco E., Fernandez J., Friedman A.S., Groner T., Hartman J., Holman M.J., Hutchins R., Keys S., Kipping D., Latham D., Marion G.H., Narayan G., Pahre M., Pal A., Peters W., Perumpilly G., Ripman B., Sipocz B., Szentgyorgyi A., Tang S., Torres M.A.P., Vaz A., Wolk S., Zezas A. <Astrophys. J. Suppl. Ser., 200, 12 (2012)> =2012ApJS..200...12H
ADC_Keywords: Photometry, UBVRI ; Supernovae Keywords: supernovae: general Abstract: We present multi-band optical photometry of 94 spectroscopically confirmed Type Ia supernovae (SNe Ia) in the redshift range 0.0055-0.073, obtained between 2006 and 2011. There are a total of 5522 light-curve points. We show that our natural-system SN photometry has a precision of ≲0.03mag in BVr'i', ≲0.06mag in u', and ≲0.07mag in U for points brighter than 17.5mag and estimate that it has a systematic uncertainty of 0.014, 0.010, 0.012, 0.014, 0.046, and 0.073mag in BVr'i'u'U, respectively. Comparisons of our standard-system photometry with published SN Ia light curves and comparison stars reveal mean agreement across samples in the range of ∼0.00-0.03mag. The current sample of low-z SNe Ia is now sufficiently large to remove most of the statistical sampling error from the dark-energy error budget. Description: The CfA4 sample consists of 5522 light-curve points. All 94 SNe have BVr'i' measurements, while 14 have U and 12 have u'. The CfA4 data were obtained on the 1.2m telescope at the FLWO using the single-chip, four-amplifier CCD KeplerCam. CfA4 data processing followed the same three steps used for CfA3: reduction, calibration, and host-galaxy subtraction (see Hicken et al. 2009, Cat. J/ApJ/700/331 for a more detailed treatment). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 108 94 SN Ia discovery data table4.dat 117 2301 Standard system comparison star photometry table5.dat 65 5522 Natural system SN photometry table6.dat 65 5485 Standard system SN photometry
See also: B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-) J/MNRAS/410/585 : SN 2009dc BVRI light curves (Silverman+, 2011) J/MNRAS/406/782 : Type Ia supernovae luminosities (Sullivan+, 2010) J/ApJS/190/418 : Light curves for 165 SNe (Ganeshalingam+, 2010) J/AJ/139/519 : Carnegie supernova project. SNe Ia (Contreras+, 2010) J/ApJ/721/1608 : Absolute UV magnitudes of type Ia SNe (Brown+, 2010) J/ApJ/716/712 : HST light curves of six SNe and Union2 (Amanullah+, 2010) J/A+A/500/L17 : Spectral flux ratio of SN Ia (Bailey+, 2009) J/ApJ/700/1097 : Light curve parameters of SN Ia (Hicken+, 2009) J/ApJ/700/331 : Light curves of type Ia supernovae (CfA3) (Hicken+, 2009) J/ApJ/699/539 : Cepheids in SN-Ia host galaxies (Riess+, 2009) J/ApJ/689/377 : SNe Ia as NIR standard candles from PAIRITEL (Wood-Vasey+, 2008) J/AJ/136/2306 : SDSS-II Supernova survey, 2005 (Holtzman+, 2008) J/AJ/135/1598 : Optical spectroscopy of type Ia SNe (Matheson+, 2008) J/ApJ/686/749 : Improved cosmological constraints from SNe (Kowalski+, 2008) J/MNRAS/389/1577 : UBVRI absolute magnitudes of Type Ia SNe (Takanashi+, 2008) J/ApJ/666/674 : ESSENCE supernova survey (Miknaitis+, 2007) J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007) J/AJ/133/403 : Light curve of 11 type Ia supernovae (Garg+, 2007) J/AJ/131/527 : UBVRI light curves of 44 type Ia supernovae (Jha+, 2006) J/ApJ/645/488 : SN type Ia luminosities (Wang+, 2006) J/AJ/112/2408 : Light Curves of 29 SNe (Hamuy+ 1996) http://www.cfa.harvard.edu/supernova : CfA Supernova Group home page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 14 A14 --- SN SN Ia identification (YYYYaa, snfYYYYMMDDNNN, or PTF10bjs) 16- 17 I2 h RAh Hour of right ascension (J2000) (1) 19- 20 I2 min RAm Minute of right ascension (J2000) 22- 27 F6.3 s RAs Second of right ascension (J2000) 29 A1 --- DE- Sign of declination (J2000) (1) 30- 31 I2 deg DEd Degree of declination (J2000) (1) 33- 34 I2 arcmin DEm Arcminute of declination (J2000) 36- 40 F5.2 arcsec DEs Arcsecond of declination (J2000) 42- 70 A29 --- Gal Galaxy identification from NED 72- 77 F6.4 --- z Heliocentric redshift (2) 79- 84 F6.4 --- zCMB CMB redshift (2) 86- 91 F6.4 mag E(B-V) B-V color excess (3) 93- 98 F6.4 mag e_E(B-V) ? E(B-V) uncertainty 100-108 A9 --- Ref SN discovery reference (4)
Note (1): J2000 positions are calibrated against UCAC3 in all but a few cases where there was insufficient coverage and USNO-A2.0 or USNO-B1.0 was used instead. The positions are a weighted mean of our measured SN RA and DEC, usually from r' but occasionally from V when insufficient r' data were available. These are usually an improvement over the positions reported by the discoverer. Note (2): The redshifts, zhelio and zCMB, are primarily from NED with a few coming from IAUC/CBET/ATEL sources when none were available from NED. Note (3): Milky Way E(B-V) values are taken from the NASA IPAC Web site, http://irsa.ipac.caltech.edu/applications/DUST/, except for SN 2007fq and SN 2009hp, which are from the Schlegel et al. (1998ApJ...500..525S) values provided by NED. Note (4): The majority are from CBET and IAUC: http://www.cbat.eps.harvard.edu/lists/Supernovae.html, while two SNe come from the SNF Web site: http://snfactory.lbl.gov/snf/open_access/snlist.php and one from ATEL 2453 (http://www.astronomerstelegram.org/?read=2453).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 14 A14 --- SN Supernova identifier 16- 17 I2 --- Seq Standard star number (1) 19- 20 I2 h RAh Hour of Right Ascension (J2000) 22- 23 I2 min RAm Minute of Right Ascension (J2000) 25- 30 F6.3 s RAs Second of Right Ascension (J2000) 32 A1 --- DE- Sign of the Declination (J2000) 33- 34 I2 deg DEd Degree of Declination (J2000) 36- 37 I2 arcmin DEm Arcminute of Declination (J2000) 39- 43 F5.2 arcsec DEs Arcsecond of Declination (J2000) 45- 50 F6.3 mag Vmag V band magnitude 52- 56 F5.3 mag e_Vmag The 1σ error in Vmag 58 I1 --- o_Vmag Number of Vmag observations 60- 65 F6.3 mag U-B ? The (U-B) color index (2) 67- 71 F5.3 mag e_U-B ? The 1σ error in U-B 73 I1 --- o_U-B Number of U-B observations 75- 79 F5.3 mag B-V The (B-V) color index 81- 85 F5.3 mag e_B-V The 1σ error in B-V 87 I1 --- o_B-V Number of B-V observations 89- 94 F6.3 mag V-r ? The (V-r') color index 96-100 F5.3 mag e_V-r ? The 1σ error in V-r 102 I1 --- o_V-r Number of V-r observations 104-109 F6.3 mag V-i ? The (V-i') color index 111-115 F5.3 mag e_V-i ? The 1σ error in V-i 117 I1 --- o_V-i Number of V-i observations
Note (1): The period-one and two natural system values can be calculated by applying the color terms or are available upon request. Note (2): All u'-B comparison star photometry is presented here as U-B but can readily be converted to u'-B via the equation u'=U+0.854 (Chonis & Gaskell 2008AJ....135..264C). The u' SN photometry is presented as u' in Tables 5 and 6.
Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 14 A14 --- SN Supernova identifier 16- 17 A2 --- Filt Filter used in the observation (BUVi'r'u') 19- 29 F11.5 d MJD Modified Julian Date of observation 31- 32 I2 --- N Number of successful subtractions (1) 34- 39 F6.4 mag sigPip Median pipeline-generated uncertainty (2) 41- 46 F6.4 mag sigPhot Standard deviation of surviving photometry for that date 48- 54 F7.4 mag mag Observed magnitude in Filter 56- 61 F6.4 mag e_mag Total uncertainty in mag (3) 63- 65 A3 --- Per [one/two] Period the photometry belongs to (only for table 5) (4)
Note (1): From that night that survived outlier rejection. For example, if there were two data images and seven reference images and none were rejected then N=14. Usually there was only one data image per night. Note (2): Of the surviving photometry points. Note (3): From sigPip and sigPhot added in quadrature. Note (4): Period one is before MJD=55058, and period two is after. The period is of crucial importance for the color terms used.
History: From electronic version of the journal References: Riess et al. CfA1. 1999AJ....117..707R Jha et al. CfA2. 2006AJ....131..527J Cat. J/AJ/131/527 Hicken et al. CfA3. 2009ApJ...700..331H Cat. J/ApJ/700/331
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 17-Jul-2012
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