J/A+A/705/A104 SN 2016iog light curves (Peng+, 2026)
SN 2016iog: A fast declining Type II-L supernova with an ultra-faint tail
persistently interacting with circumstellar material.
Peng Z.-H., Benetti S., Cai Y.-Z., Pastorello A., Valerin G., Reguitti A.,
Fiore A., Fang Q.-L., Wang Z.-Y., Berton M., Borsato L., Cappellaro E.,
Congiu E., Elias-Rosa N., Granata V., Isern J., La Mura G., Ochner P.,
Raddi R., Terreran G., Tomasella L., Turatto M., Yan S.-Y., Pei S.-P.,
Wu C.-Y., Zha S., Wang X.-F., Wang B., Pan Y.
<Astron. Astrophys. 705, A104 (2026)>
=2026A&A...705A.104P 2026A&A...705A.104P (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry ; Optical
Keywords: circumstellar matter - stars: mass-loss - supernovae: general -
supernovae: individual: SN 2016iog
Abstract:
We present optical photometric and spectroscopic observations of the
rapidly declining Type IIL supernova (SN) 2016iog. SN 2016iog reached
its peak ∼14 days after explosion, with an absolute magnitude in the V
band of -18.64±0.15mag, followed by a steep decline of
8.85±0.15mag(100d)-1 post-peak. Such a high decline rate makes SN
2016iog one of the fastest declining Type IIL SNe observed to date.
The rapid rise in the light curve, combined with the nearly
featureless continuum observed in the spectrum at +9.3days, suggests
the presence of interaction.In the recombination phase, we observed
broad Halpha lines that persist at all epochs. In addition, the
prominent double-peaked Halpha feature observed in the late-time
spectrum (+190.8days) is likely attributable either to significant
dust formation within a cool dense shell or to asymmetric
circumstellar material. These features suggest the presence of
sustained interaction around SN 2016iog. We propose that the observed
characteristics of SN 2016iog can be qualitatively explained by
assuming a low-mass H-rich envelope surrounding a red supergiant
progenitor star with low-density circumstellar material.
Description:
The multi-band photometric data for SN 2016iog.
Objects:
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RA (2000) DE Designation(s)
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10 04 18.59 +43 25 29.1 SN 2016iog = ASASSN -16ns
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
16iog.dat 82 186 The multi-band photometric data for SN 2016iog
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Byte-by-byte Description of file: 16iog.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Date of observation (yymmdd)
12- 20 F9.3 d MJD Modified Julian Date
23- 28 A6 --- Filter Filter (BV G ugriz orange cyan)
31- 34 A4 --- System AB or Vega
36- 41 F6.3 mag mag Apparent magnitude
45- 49 F5.3 mag e_mag Error on apparent magnitude
54 A1 --- l_mag [UP] 'U' for limit and 'P' for detection
60- 82 A23 --- Inst/Source Instrument or Source
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Acknowledgements:
Z.-H. Peng, S230601023(at)cqupt.edu.cn
(End) Z.-H. Peng [CQUPT, China], Patricia Vannier [CDS] 21-Nov-2025