J/MNRAS/449/1941 Optical/NIR photometry of OGLE-2012-SN-006 (Pastorello+, 2015)
Massive stars exploding in a He-rich circumstellar medium -
V. Observations of the slow-evolving SN Ibn OGLE-2012-SN-006.
Pastorello A., Wyrzykowski L., Valenti S., Prieto J.L., Kozlowski S.,
Udalski A., Elias-Rosa N., Morales-Garoffolo A., Anderson J.P., Benetti S.,
Bersten M., Botticella M.T., Cappellaro E., Fasano G., Fraser M.,
Gal-Yam A., Gillone M., Graham M.L., Greiner J., Hachinger S., Howell D.A.,
Inserra C., Parrent J., Rau A., Schulze S., Smartt S.J., Smith K.W.,
Turatto M., Yaron O., Young D.R., Kubiak M., Szymanski M.K.,
Pietrzynski G., Soszynski I., Ulaczyk K., Poleski R., Pietrukowicz P.,
Skowron J., Mroz P.
<Mon. Not. R. Astron. Soc., 449, 1941-1953 (2015)>
=2015MNRAS.449.1941P 2015MNRAS.449.1941P (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, UBVRI ; Photometry, infrared
Keywords: supernovae: general - supernovae: individual: OGLE-2012-SN-006 -
supernovae: individual: SN 2006jc - supernovae: individual: SN 2010al
Abstract:
We present optical observations of the peculiar Type Ibn supernova
(SN Ibn) OGLE-2012-SN-006, discovered and monitored by the Optical
Gravitational Lensing Experiment-IV survey, and spectroscopically
followed by Public ESO Spectroscopic Survey of Transient Objects
(PESSTO) at late phases. Stringent pre-discovery limits constrain the
explosion epoch with fair precision to JD=2456203.8±4.0. The rise
time to the I-band light-curve maximum is about two weeks. The object
reaches the peak absolute magnitude MI=-19.65±0.19 on
JD=2456218.1±1.8. After maximum, the light curve declines for
about 25 d with a rate of 4 mag (100 d)-1. The symmetric I-band peak
resembles that of canonical Type Ib/c supernovae (SNe), whereas SNe Ibn
usually exhibit asymmetric and narrower early-time light curves. Since
25 d past maximum, the light curve flattens with a decline rate slower
than that of the 56Co-56Fe decay, although at very late phases it
steepens to approach that rate. However, other observables suggest
that the match with the 56Co decay rate is a mere coincidence, and the
radioactive decay is not the main mechanism powering the light curve
of OGLE-2012-SN-006. An early-time spectrum is dominated by a blue
continuum, with only a marginal evidence for the presence of HeI lines
marking this SN type. This spectrum shows broad absorptions bluewards
than 5000 Å, likely OII lines, which are similar to spectral
features observed in superluminous SNe at early epochs. The object has
been spectroscopically monitored by PESSTO from 90 to 180 d after
peak, and these spectra show the typical features observed in a number
of SN 2006jc-like events, including a blue spectral energy distribution
and prominent and narrow (νFWHM∼1900 km/s) HeI emission lines.
This suggests that the ejecta are interacting with He-rich circumstellar
material. The detection of broad (104 km/s) OI and CaII features
likely produced in the SN ejecta (including the [OI]
λλ6300,6364 doublet in the latest spectra) lends support
to the interpretation of OGLE-2012-SN-006 as a core-collapse event.
Description:
Photometric measurements in the optical and NIR bands were obtained
through the PSF-fitting technique. A template PSF was built using
stars in the SN field. With this PSF model along with a low-order
polynomial surface, we finally performed a fit to the SN and the
underlying background. OGLE-IV photometry was obtained using the
difference imaging analysis, which is a template subtraction method
adapted to the OGLE data and detailed in Wyrzykowski et al. 2014,
J/AcA/64/197 (see also Wozniak 2000, J/AcA/50/421).
Objects:
---------------------------------------------------------------
RA (ICRS) DE Designation(s)
---------------------------------------------------------------
03 33 34.79 -74 23 40.1 OGLE-2012-SN-006 = OGLE 2012-SN-6
---------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 77 123 Optical photometry of OGLE-2012-SN-006
tablea2.dat 54 7 NIR photometry of OGLE-2012-SN-006
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See also:
J/AcA/50/421 : OGLE-II DIA BUL_SC1 field (Wozniak, 2000)
J/AcA/64/197 : OGLE-IV 2012-2014 transients (Wyrzykowski+, 2014)
J/A+A/602/A93 : SN Type Ibn OGLE-2014-SN-131 lightcurves
(Karamehmetoglu+, 2017)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Observation date
12- 19 F8.2 d JD Julian Date (JD-2400000)
21- 25 F5.2 mag Umag ? U-band magnitude
27- 30 F4.2 mag e_Umag ? Uncertainty in Umag
32- 36 F5.2 mag Bmag ? B-band magnitude
38- 41 F4.2 mag e_Bmag ? Uncertainty in Bmag
43- 47 F5.2 mag Vmag ? V-band magnitude
49- 52 F4.2 mag e_Vmag ? Uncertainty in Vmag
54- 58 F5.2 mag Rmag ? R-band magnitude
60- 63 F4.2 mag e_Rmag ? Uncertainty in Rmag
65 A1 --- l_Imag [>] Limit flag on Imag
66- 70 F5.2 mag Imag ? I-band magnitude
72- 75 F4.2 mag e_Imag ? Uncertainty in Imag
77 I1 --- Inst [1/6] Instrument identification (G1)
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "date" Date Observation date
12- 19 F8.2 d JD Julian Date (JD-2400000)
21- 25 F5.2 mag Jmag J-band magnitude
27- 30 F4.2 mag e_Jmag Uncertainty in Jmag
32- 36 F5.2 mag Hmag ? H-band magnitude
38- 41 F4.2 mag e_Hmag ? Uncertainty in Hmag
43- 47 F5.2 mag Kmag ? K-band magnitude
49- 52 F4.2 mag e_Kmag ? Uncertainty in Kmag
54 I1 --- Inst [1/6] Instrument identification (G1)
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Global notes:
Note (G1): Instrument as follows:
1 = 1.3-m Warsaw University Telescope + OGLE-IV mosaic camera (Las Campanas
Observatory);
2 = 2.2-m MPI/ESO Telescope + GROND (ESO-La Silla Observatory);
3 = 3.58-m New Technology Telescope + EFOSC2 (ESO-LaSilla Observatory);
4 = LCOGT 1.0m-05 telescope + SBIG STX-16083 with Kodak KAF-16803 FI (Cerro
Tololo InterAmerican Observatory);
5 = LCOGT 1.0m-09 telescope + SBIG STX-16083 with Kodak KAF-16803 FI (Cerro
Tololo Inter-American Observatory);
6 = 3.58-m New Technology Telescope + SOFI (ESO-La Silla Observatory).
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History:
From electronic version of the journal
References:
Pastorello et al. Paper I. 2008MNRAS.389..113P 2008MNRAS.389..113P
Pastorello et al. Paper II. 2008MNRAS.389..131P 2008MNRAS.389..131P
Mattila et al. Paper III. 2008MNRAS.389..141M 2008MNRAS.389..141M
Pastorello et al. Paper IV. 2015MNRAS.449.1921P 2015MNRAS.449.1921P, Cat. J/MNRAS/449/1921
Pastorello et al. Paper VI. 2015MNRAS.449.1954P 2015MNRAS.449.1954P
Pastorello et al. Paper VII. 2015MNRAS.453.3649P 2015MNRAS.453.3649P
Pastorello et al. Paper VIII. 2015MNRAS.454.4293P 2015MNRAS.454.4293P
Pastorello et al. Paper IX. 2016MNRAS.456..853P 2016MNRAS.456..853P
(End) Tiphaine Pouvreau [CDS] 06-Dec-2017