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J/AJ/130/2453       9 high-redshift ESSENCE supernovae       (Krisciunas+, 2005)

Hubble space telescope observations of nine high-redshift ESSENCE supernovae. Krisciunas K., Garnavich P.M., Challis P., Prieto J.L., Riess A.G., Barris B., Aguilera C., Becker A.C., Blondin S., Chornock R., Clocchiatti A., Covarrubias R., Filippenko A.V., Foley R.J., Hicken M., Jha S., Kirshner R.P., Leibundgut B., Li W., Matheson T., Miceli A., Miknaitis G., Rest A., Salvo M.E., Schmidt B.P., Smith R.C., Sollerman J., Spyromilio J., Stubbs C.W., Suntzeff N.B., Tonry J.L., Wood-Vasey W.M. <Astron. J., 130, 2453-2472 (2005)> =2005AJ....130.2453K
ADC_Keywords: Supernovae ; Redshifts ; Photometry, HST ; Photometry, VRI Keywords: distance scale - galaxies: distances and redshifts - supernovae: general Abstract: We present broadband light curves of nine supernovae ranging in redshift from 0.5 to 0.8. The supernovae were discovered as part of the ESSENCE project, and the light curves are a combination of Cerro Tololo 4m and Hubble Space Telescope (HST) photometry. On the basis of spectra and/or light-curve fitting, eight of these objects are definitely Type Ia supernovae, while the classification of one is problematic. The ESSENCE project is a 5yr endeavor to discover about 200 high-redshift Type Ia supernovae, with the goal of tightly constraining the time average of the equation-of-state parameter [w=p/(ρc2)] of the "dark energy." To help minimize our systematic errors, all of our ground-based photometry is obtained with the same telescope and instrument. In 2003 the highest redshift subset of ESSENCE supernovae was selected for detailed study with HST. Here we present the first photometric results of the survey. Description: In this paper we report photometry of nine objects discovered in 2003 October, November, and December, which were also observed with HST ACS (using the Wide Field Camera). The goal of the HST observations was to observe the highest redshift end of the ESSENCE sample, since photometry becomes difficult with the CTIO 4m as they fade. In Table 1 we list the nine objects. Their redshifts were obtained from observations with the Keck I Low Resolution Imaging Spectrometer (LRIS), Gemini Multiobject Spectrograph (GMOS), VLT FORS1, or Magellan (Baade + Inamori Magellan Areal Camera and Spectrograph [IMACS]). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 50 9 High-redshift SNe: basic data table2.dat 82 49 HST photometry table3.dat 54 101 Ground-based R and I photometry
See also: B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-) J/ApJ/594/1 : High-z supernovae VRI mag and distances (Tonry+, 2003) J/ApJ/602/571 : High-redshift supernovae IRZ fluxes (Barris+, 2004) J/ApJ/613/200 : Hubble Higher z Supernova Search, HHZSS (Strolger+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name SN name 11- 14 A4 --- ESSENCE ESSENCE name 16- 17 I2 h RAh Hour of Right Ascension (J2000.0) 19- 20 I2 min RAm Minute of Right Ascension (J2000.0) 22- 26 F5.2 s RAs Second of Right Ascension (J2000.0) 28 A1 --- DE- Sign of the Declination (J2000.0) 29- 30 I2 deg DEd Degree of Declination (J2000.0) 32- 33 I2 arcmin DEm Arcminute of Declination (J2000.0) 35- 38 F4.1 arcsec DEs Arcsecond of Declination (J2000.0) 40- 43 F4.2 --- z Redshift (1) 44 A1 --- f_z Flag on z (2) 46- 50 F5.3 mag E(B-V) From the reddening maps of Schlegel et al. (1998ApJ...500..525S)
Note (1): Obtained from the spectra of the SNe themselves, rather than the host galaxies. We used our program SNID (J. L. Tonry et al. 2006, in preparation). Note (2): Flag on z, defined as follows: c = See text and Matheson et al. (2005AJ....129.2352M) for a discussion of the redshift of this object d = The minimum reduced χ2 value of the light-curve fits is obtained for z=0.68; no spectroscopic redshift was obtained
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name SN name 11- 20 F10.2 --- JD Julian Date 22- 27 F6.3 mag F625W ? HST/ACS F625W band magnitude (1) 29- 32 F4.2 mag E_F625W ? Upper 1sigma error in F625W (2) 34- 38 F5.3 mag e_F625W ? The 1σ error in F625W 40- 45 F6.3 mag F775W ? HST/ACS F775W band magnitude (1) 47- 50 F4.2 mag E_F775W ? Upper 1sigma error in F775W (2) 52- 56 F5.3 mag e_F775W ? The 1σ error in F775W 58- 63 F6.3 mag F850LP ? HST/ACS F850W band magnitude (1) 65- 69 F5.3 mag e_F850LP ? The 1σ error in F850LP 71- 76 F6.3 mag F110W ? HST/NICMOS F110W band magnitude 78- 82 F5.3 mag e_F110W ? The 1σ error in F110W
Note (1): The ACS magnitudes given are "Vega" magnitudes derived using 50-pixel-radius zeropoints (Sirianni et al. 2005PASP..117.1049S), which are based on the Vega spectrophotometric calibration of Bohlin & Gilliland (2004AJ....127.3508B). Note (2): When this value is given the data in the following column represents the lower 1σ error.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name SN name 11- 20 F10.2 --- JD Julian Date 22 A1 --- l_Rmag Indicates Rmag is a 1σ upper limit 23- 27 F5.2 mag Rmag ? The R band magnitude (1) 29- 32 F4.2 mag E_Rmag ? Upper 1sigma error in Rmag (2) 34- 37 F4.2 mag e_Rmag ? The 1σ error in Rmag 39 A1 --- l_Imag Indicates Imag is a 1σ upper limit 40- 44 F5.2 mag Imag ? The I band magnitude (1) 46- 49 F4.2 mag E_Imag ? Upper 1sigma error in Imag (2) 51- 54 F4.2 mag e_Imag ? The 1σ error in Imag
Note (1): The magnitudes are natural system "Vega" magnitudes. See text for more details. Note (2): When this value is given the data in the following column represents the lower 1σ error.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 20-Apr-2006
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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