J/A+A/584/A62 SUDARE VST-OmegaCAM search supernova rates (Cappellaro+, 2015)
Supernova rates from the SUDARE VST-OmegaCAM search. I. Rates per unit volume.
Cappellaro E., Botticella M.T., Pignata G., Grado A., Greggio L.,
Limatola L., Vaccari M., Baruffolo A., Benetti S., Bufano F.,
Capaccioli M., Cascone E., Covone G., De Cicco D., Falocco S.,
Della Valle M., Jarvis M., Marchetti L., Napolitano N.R., Paolillo M.,
Pastorello A., Radovich M., Schipani P., Spiro S., Tomasella L., Turatto M.
<Astron. Astrophys., 584, A62-62 (2015)>
=2015A&A...584A..62C 2015A&A...584A..62C (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Supernovae ; Redshifts
Keywords: supernovae: general - galaxies: star formation -
Galaxy: stellar content - surveys
Abstract:
We describe the observing strategy, data reduction tools, and early
results of a supernova (SN) search project, named SUDARE, conducted
with the ESO VST telescope, which is aimed at measuring the rate of
the different types of SNe in the redshift range 0.2<z<0.8. The search
was performed in two of the best studied extragalactic fields, CDFS
and COSMOS, for which a wealth of ancillary data are available in the
literature or in public archives. We developed a pipeline for the data
reduction and rapid identification of transients. As a result of the
frequent monitoring of the two selected fields, we obtained light
curve and colour information for the transients sources that were used
to select and classify SNe by means of an especially developed tool.
To accurately characterise the surveyed stellar population, we exploit
public data and our own observations to measure the galaxy photometric
redshifts and rest frame colours. We obtained a final sample of 117
SNe, most of which are SN Ia (57%) with the remaining ones being core
collapse events, of which 44% are type II, 22% type IIn and 34% type
Ib/c. To link the transients, we built a catalogue of ∼1.3x105
galaxies in the redshift range 0<z≤1, with a limiting magnitude
KAB=23.5mag. We measured the SN rate per unit volume for SN Ia and
core collapse SNe in different bins of redshifts. The values are
consistent with other measurements from the literature. The dispersion
of the rate measurements for SNe-Ia is comparable to the scatter of
the theoretical tracks for single degenerate (SD) and double
degenerate (DD) binary systems models, therefore it is not possible to
disentangle among the two different progenitor scenarios. However,
among the three tested models (SD and the two flavours of DD that
either have a steep DDC or a wide DDW delay time distribution), the SD
appears to give a better fit across the whole redshift range, whereas
the DDC better matches the steep rise up to redshift ∼1.2. The DDW
instead appears to be less favoured. Unlike recent claims, the core
collapse SN rate is fully consistent with the prediction that is based
on recent estimates of star formation history and standard progenitor
mass range.
Description:
The SUDARE SN survey was performed using the VLT Survey Telescope
(VST) equipped with the OmegaCAM camera, that started regular
operations in October 2011 at ESO Paranal (Chile). The VST has a
primary mirror of 2.6m and a f/5.5 modified Ritchey-Chretien optical
layout that is designed to deliver a large, uniform focal plane.
SUDARE is a four-year programme and this paper is devoted to analysing
the first two observing seasons for VOICE-CDFS and one season for
COSMOS. We are currently completing the monitoring of both fields for
the two subsequent seasons.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea2.dat 138 117 List of supernovae
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 31 A31 --- Name SN designation
33- 34 I2 h RAh Right ascension (J2000)
36- 37 I2 min RAm Right ascension (J2000)
39- 42 F4.1 s RAs Right ascension (J2000)
44 A1 --- DE- Declination sign (J2000)
45- 46 I2 deg DEd Declination (J2000)
48- 49 I2 arcmin DEm Declination (J2000)
51- 54 F4.1 arcsec DEs Declination (J2000)
56- 59 F4.2 --- zhost ? Host galaxy redshift
61- 64 F4.2 --- e_zhost ? Error on zhost (95% lower value)
for photometric redshift
66- 69 F4.2 --- E_zhost ? Error on zhost (95% upper value)
for photometric redshift
72- 78 A7 --- n_zhost Method of redshift measurement
80- 83 A4 --- Type Most probable SN type
85- 88 F4.2 --- PType Bayesian probability for Type
90- 95 A6 --- Temp Best fitting template
97-100 F4.2 --- zSN SN redshift
102-105 F4.1 mag AV Extinction
108-111 F4.1 --- Dmu Flux scaling
113-117 I5 d Tmax Epoch of maximum (MJD)
119-121 F3.1 --- chi2n χ2n value
123-124 I2 --- Npt Number of photometric measurements
126-127 I2 --- Npt2 Number of measurements with S/N ratio >2
129-133 E5.1 --- Pchi2 Integrated right tail probability of the
χ2 distribution
135-138 A4 --- Notes Notes (1)
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Note (1): Notes as follows:
PSN = Probable SNe (see text)
a = SN 2012ez
b = SN 2012fa (IAUC, 3236)
c = SN 2012fn
d = SN 2012fp
e = SN 2012fq
f = SN 2012fo (IAUC, 3274)
g = SN 2012gu
h = SN 2012gs
i = SN 2012gv
j = SN 2012gt (IAUC, 3311)
* = Host galaxy redshift obtained in this program
** = SN type revised: based only on spectrum was classified as Ic
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Jan-2016