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Very late-time spectroscopy of SN 2009ip: Constraints on the ongoing Hα emission

Aug 14, 2023
7 pages
Published in:
  • Astron.Astrophys. 677 (2023) L1,
  • Astron.Astrophys. 677 (2023) L1
  • Published: Sep 1, 2023
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Abstract: (EDP Sciences)
Context. The peculiar supernova (SN) 2009ip was an ambiguous event that placed many questions on its true origin. Here, we present very late-time spectroscopic and photometric observations of SN 2009ip, obtained 9 years (3274 days) after the 2012B outburst.Aims. We analyze the Hα emission still present in the very late-time spectrum of SN 2009ip. We also obtain photometric measurements in r, g and i bands.Methods. We obtain observations of SN 2009ip on 2021 September 10 with the IMACS instrument at the 6.5 m Magellan Baade Telescope, located at the Las Campanas Observatory.Results. SN 2009ip was detected in r, g and i bands, with an absolute magnitude in r band of ∼ − 8.66 mag. We show that the source faded significantly since the last observations in these bands. We further show that the very late-time spectrum contains a persistent Hα emission, although no other emission lines were detected. We measure a full width at half maximum of 930 ± 40 km s−1 and luminosity of ∼ 8.0 × 1037 erg s−1 for the Hα emission. The luminosity decreased relatively slowly in comparison to the last observations and its fading rate is very similar to other long-living interacting transients, such as SN 2005ip. Finally, we conclude that although these properties could be consistent with a non-regular core-collapse SN, they could also be explained by non-terminal explosion scenarios.Key words: stars: mass-loss / supernovae: general / supernovae: individual: SN 2009ip / stars: massive
Note:
  • 7 pages, 4 figures, accepted at A&A
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