J/A+A/690/A259 Multi-band light curve of SN 2021adxl (Brennan+, 2024)
SN 2021adxl: A luminous nearby interacting supernova in an extremely low
metallicity environment.
Brennan S.J., Schulze S., Lunnan R., Sollerman J., Yan L., Fransson C.,
Irani I., Melinder J., Chen T.-W., De K., Fremling C., Kim Y.-L.,
Perley D., Pessi P.J., Drake A.J., Graham M.J., Laher R.R., Masci F.J.,
Purdum J., Rodriguez H.
<Astron. Astrophys. 690, A259 (2024)>
=2024A&A...690A.259B 2024A&A...690A.259B (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, ultraviolet ; Optical ; Infrared
Keywords: circumstellar matter - supernovae: general - ISM: abundances -
HII regions
Abstract:
SN 2021adxl is a slowly evolving, luminous Type IIn supernova with
asymmetric emission line profiles, similar to the well-studied SN
2010jl. We present extensive optical, near-ultraviolet, and
near-infrared photometry and spectroscopy covering approximately 1.5
years after discovery. SN 2021adxl occurred in an unusual environment,
atop a vigorously star-forming region that is offset from its host
galaxy's core. The appearance of Lyman-alpha, OII, and the compact
core would classify the host of SN 2021adxl as a Blueberry galaxy,
similar to higher redshift Green Pea galaxies. Using several abundance
indicators, we find the metallicity of the explosion environment to be
only 10 percent of solar, the lowest reported metallicity for a Type
IIn supernova environment. SN 2021adxl reaches a peak magnitude of
approximately -20.2 in the r band, and since discovery, it has faded
by about 4 magnitudes in the r band, with a cumulative radiated energy
of approximately 1.5x1050erg over 18 months. SN 2021adxl shows
strong signs of interaction with a complex circumstellar medium, as
evidenced by the detection of X-rays, coronal emission lines, and
multi-component hydrogen and helium profiles. To further understand
this interaction, we model the H-alpha profile using a Monte Carlo
electron scattering code. The blueshifted high-velocity component is
consistent with emission from a radially thin, spherical shell,
resulting in broad emission components due to electron scattering.
Using the velocity evolution of this emitting shell, we find that the
SN ejecta collide with circumstellar material of at least 5 solar
masses, assuming a steady-state mass-loss rate of 4 to
6x10-3M☉/yr for the first approximately 200 days of evolution.
Continued observations of SN 2021adxl may reveal signatures of dust
formation or an infrared excess, similar to what was seen in
SN 2010jl.
Description:
We present 1.5 years of the evolution of the luminous Type
IIn SN 2021adxl. The table provides the photometric analysis used in
the publication.
Objects:
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RA (2000) DE Designation(s)
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11 48 06.940 -12 38 41.71 SN 2021adxl
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig2.dat 61 534 Multi-band light curve of SN 2021adxl covering
1.6 years of its post-peak evolution
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Byte-by-byte Description of file: fig2.dat
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Bytes Format Units Label Explanations
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1- 18 F18.12 d MJD [59521.54/60107.53] Modified Julian Date
20- 37 F18.15 mag mag [13.85/19.86] Magnitude in Filter
39- 56 F18.16 mag e_mag [0.0/0.34] Magnitude error
58- 61 A4 --- Filter Filter (1)
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Note (1): filters are UBV, G, J, UVM2 UVW1 UVW2, gri, z and o.
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Acknowledgements:
Sean Brennan, sean.brennan(at)astro.su.se
(End) Patricia Vannier [CDS] 25-Sep-2024