J/A+A/686/A79 SN 2016adj light curves (Stritzinger+, 2024)
The carbon-rich type Ic supernova 2016adj in the iconic dust lane of
Centaurus A: Potential signatures of an interaction with circumstellar hydrogen.
Stritzinger M.D., Baron E., Taddia F., Burns C.R., Fraser M., Galbany L.,
Holmbo S., Hoeflich P., Morrell N., Arndt L.S., Hsiao E.Y.,
Johansson J.P., Karamehmetoglu E., Kuncarayakti H., Lyman J., Moriya T.J.,
Phan K., Phillips M.M., Anderson J.P., Ashall C., Brown P.J., Castellon S.,
Della Valle M., Gromadzki M., Handberg R., Lu J., Nicholl M., Shahbandeh M.
<Astron. Astrophys. 686, A79 (2024)>
=2024A&A...686A..79S 2024A&A...686A..79S (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, infrared ; Optical
Keywords: supernovae: general - supernovae: individual: SN 2016adj -
galaxies: individual: NGC 5128 (Centaurus A)
Abstract:
We present a comprehensive data set of supernova (SN) 2016adj located
within the central dust lane of Centaurus A. SN 2016adj is
significantly reddened and after correcting the peak apparent B-band
magnitude (mB=17.48±0.05) for Milky Way reddening and our inferred
host-galaxy reddening parameters (i.e., RVhost=5.7±0.7 and
AVhost=6.3±0.2mag), we estimated it reached a peak absolute
magnitude of MB~-18. A detailed inspection of the optical and
near-infrared (NIR) spectroscopic time series reveals a carbon-rich SN
Ic and not a SN Ib/IIb as previously suggested in the literature. The
NIR spectra show prevalent carbon-monoxide formation occurring already
by +41 days past B-band maximum, which is ∼11 days earlier than
previously reported in the literature for this object. Interestingly,
around two months past maximum, the NIR spectrum of SN 2016adj begins
to exhibit H features, with a +97 days medium resolution spectrum
revealing both Paschen and Bracket lines with absorption minima of
∼2000km/s, full-width-half-maximum emission velocities of ∼1000km/s,
and emission line ratios consistent with a dense emission region. We
speculate that these attributes are due to a circumstellar interaction
(CSI) between the rapidly expanding SN ejecta and a H-rich shell of
material that formed during the pre-SN phase. A bolometric light curve
was constructed and a semi-analytical model fit suggests the SN
synthesized 0.5M☉ of 56Ni and ejected 4.7M☉ of material,
though these values should be approached with caution given the large
uncertainties associated with the adopted reddening parameters and
known light echo emission. Finally, inspection of the Hubble Space
Telescope archival data yielded no progenitor detection.
Description:
The table contains the optical and near-infrared photometry of SN
2016adj. The columns appear from left to right as follows:
modified Julian date of observations, phase relative to the epoch of
the B-band maximum, photometry magnitude, photometry magnitude error
as computed by summing in quadrature the photometry and nightly
zero-point errors, filter ID, and source of the data.
Objects:
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RA (2000) DE Designation(s)
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13 25 24.12 -43 00 57.9 SN 2016adj = AT 2016adj
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea3.dat 38 225 Ground-based photometry of SN 2016adj
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 d MJD Observation date (MJD)
11- 16 F6.2 d Phase Phase
19- 23 F5.2 mag mag Magnitude in Filter
26- 29 F4.2 mag e_mag Magnitude in Filter error
31 A1 --- Filter [ugriBVYJHK] Filters
33- 38 A6 --- Source Source (CSP, VST or PESSTO)
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Acknowledgements:
Maximilian Stritzinger, max(at)phys.au.dk
(End) Patricia Vannier [CDS] 14-Mar-2024