J/A+A/698/A129 Photometric measurements of SN 2024abfo (Reguitti+, 2025)
SN 2024abfo: a partially stripped SN II from a yellow supergiant.
Reguitti A., Pastorello A., Smartt S.J., Valerin G., Pignata G., Campana S.,
Chen T.-W., Sankar A.K., Moran S., Mazzali P.A., Duarte J., Salmaso I.,
Anderson J.P., Ashall C., Benetti S., Gromadzki M., Gutierrez C.P.,
Humina C., Inserra C., Kankare E., Kravtsov T., Muller-Bravo T.E.,
Pessi P.J., Sollerman J., Young D.R., Chambers K., de Boer T., Gao H.,
Huber M., Lin C.-C., Lowe T., Magnier E., Minguez P., Smith I.A.,
Smith K.W., Srivastav S., Wainscoat R., Benedet M.
<Astron. Astrophys. 698, A129 (2025)>
=2025A&A...698A.129R 2025A&A...698A.129R (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, CCD ; Optical ; Ultraviolet
Keywords: supernovae: general - supernovae: individual: SN 2024abfo -
galaxies: individual: NGC 1493
Abstract:
We present photometric and spectroscopic data of the type IIb
supernova (SN) 2024abfo in NGC 1493 (at 11Mpc).
The ATLAS survey discovered the object just a few hours after the
explosion, and observed a fast rise on the first day.
Signs of the sharp shock break-out peak and the subsequent cooling
phase are observed in the ultraviolet and the bluest optical bands in
the first couple of days, while no peak is visible in the reddest
filters.
Subsequently, in analogy with normal SNe IIb, the light curve of
SN 2024abfo rises again in all bands to the broad peak, with the
maximum light reached around one month after the explosion. Its
absolute magnitude at peak is Mr=-16.5±0.1mag, making it a faint
SN IIb.
The early spectra are dominated by Balmer lines with broad P-Cygni
profiles indicating ejecta velocity of 22500km/s. One month after
the explosion, the spectra display a transition towards being
He-dominated, though the H lines do not completely disappear,
supporting the classification of SN 2024abfo as a relatively
H-rich SN IIb.
We identify the progenitor of SN 2024abfo in archival images of the
Hubble Space Telescope, the Dark Energy Survey, and the XMM-Newton
space telescope, in multiple optical filters. From its spectral
energy distribution, the progenitor is consistent with being a yellow
supergiant, having an initial mass of 15M_☉. This detection
supports an emerging trend of SN IIb progenitors being more luminous
and hotter than SN II ones, and being primaries of massive binaries.
Within the SN IIb class, fainter events such as SN 2024abfo tend to
have cooler and more expanded progenitors than luminous SNe IIb.
Description:
Photometric measurements of SN 2024abfo in the optical Johnson, Sloan,
Swift/UVOT, and ATLAS orange and cyan filters are presented. In each
table date, MJD, magnitudes with relative errors and instruments are
given.
Objects:
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RA (2000) DE Designation(s)
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03 57 25.61 -46 11 07.6 SN 2024abfo
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
atlas.dat 48 57 Magnitudes of SN 2024abfo in the
ATLAS orange and cyan filters
johnson.dat 55 93 Magnitudes of SN 2024abfo in the
Johnson UBV filters
sloan.dat 55 275 Magnitudes of SN 2024abfo in the
Sloan griz filters
swift.dat 53 93 Magnitudes of SN 2024abfo from Swift/UVOT
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Byte-by-byte Description of file: atlas.dat johnson.dat sloan.dat swift.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Observation date
12- 22 F11.5 d MJD Modified Julian date
24- 26 A3 --- Filter Filter (1)
28- 33 F6.3 mag mag Magnitude in Filter
35- 39 F5.3 mag e_mag ?=0 Magnitude error
41 A1 --- Flag [PU] P = Detection, U = Upper limit
43- 55 A13 --- Inst Combination of Telescope, Instrument
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Note (1): Filters are o, c for atlas data, U, B, V for Johnson data,
g, r, i, z for Sloan data, U, B, V, UM2, UW1, UW2 for Swift/UVOT data
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Acknowledgements:
Andrea Reguitti, andrea.reguitti(at)gmail.com
(End) Patricia Vannier [CDS] 02-May-2025