J/A+A/698/A70 SN 2023xqm UBVgri light curves (Zeng+, 2025)
SN 2023xqm: A gradually fading Ia supernova exhibiting isolated
high-velocity signatures.
Zeng X., Luo Y., Wang X., Yang Y., Li X., Huang Y., Zheng S., Zheng S.,
Huang Y., Li S., Howell D.A., Bostroem K.A., McCully C., Esamdin A.,
Andrews M., Farah R.J., Newsome M., Zhang H., Zhang P., Hu L.
<Astron. Astrophys. 698, A70 (2025)>
=2025A&A...698A..70Z 2025A&A...698A..70Z (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry ; Optical
Keywords: Supernovae: general - supernovae: individual: SN 2023xqm
Abstract:
We conducted an exhaustive analysis combining optical photometry and
spectroscopy of the type Ia supernova designated SN 2023xqm. Our
observational period spanned from the two weeks preceding to 88 days
after the B-band peak luminosity time. We determined the peak
brightness in the B-band to be -18.90±0.50mag, and it is accompanied
by a moderately slow decay rate of 0.90±0.07mag. The maximum
quasi-bolometric luminosity was estimated to be 1.52x1043erg/s and
correlated with a calculated 56Ni mass of 0.74±0.05M☉,
aligning with the modestly reduced rate of light curve decay. A
plateau that can be observed in the r-i color curve might correlate
with the minor elevation noted between the principal and secondary
peaks of the i-band light curve. An initial spectral analysis of SN
2023xqm revealed distinct high-velocity features (HVFs) in CaII that
contrast with the subdued HVFs observed in SiII. Such attributes may
stem from variations in ionization or temperature or from scenarios
involving enhanced element abundance, suggesting a naturally lower
photospheric temperature for SN 2023xqm, which could be indicative of
incomplete burning during the white dwarf's detonation. The observed
traits in the light curve and the spectral features offer significant
insights into the variability among type Ia supernovae and their
explosion dynamics.
Description:
The supernova designated as SN 2023xqm was first identified on
November 13, 2023, at the celestial coordinates RA=10:34:34.990,
DE=-27:39:03.31 (J2000) by the ATLAS survey (Tonry et al., 2023,
Transient Name Server Discov. Rep., 2023-2938, 1).
This study provides comprehensive observations of the SN Ia 2023xqm,
including extensive optical photometry and spectroscopy.
Objects:
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RA (2000) DE Designation(s)
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10 34 34.990 -27 39 03.31 SN 2023xqm
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 80 20 Photometric standards used in the
SN 2023xqm field
table2.dat 87 56 Optical photometric observations (UBVgri)
of SN 2023xqm
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Star Star sequential number
4- 9 F6.3 mag Umag U magnitude
11- 15 F5.3 mag e_Umag U magnitude error
17- 22 F6.3 mag Bmag B magnitude
24- 28 F5.3 mag e_Bmag B magnitude error
30- 35 F6.3 mag Vmag V magnitude
37- 41 F5.3 mag e_Vmag V magnitude error
43- 48 F6.3 mag gmag g magnitude
50- 54 F5.3 mag e_gmag g magnitude error
56- 61 F6.3 mag rmag r magnitude
63- 67 F5.3 mag e_rmag r magnitude error
69- 74 F6.3 mag imag i magnitude
76- 80 F5.3 mag e_imag i magnitude error
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 F9.3 d MJD Modified Julian date
11- 16 F6.3 mag Umag ? U magnitude
18- 22 F5.3 mag e_Umag ? U magnitude error
24- 29 F6.3 mag Bmag B magnitude
31- 35 F5.3 mag e_Bmag B magnitude error
37- 42 F6.3 mag Vmag V magnitude
44- 48 F5.3 mag e_Vmag V magnitude error
50- 55 F6.3 mag gmag g magnitude
57- 61 F5.3 mag e_gmag g magnitude error
63- 68 F6.3 mag rmag r magnitude
70- 74 F5.3 mag e_rmag r magnitude error
76- 81 F6.3 mag imag i magnitude
83- 87 F5.3 mag e_imag i magnitude error
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Acknowledgements:
Xiangyun Zeng, xyzeng2018(at)ctgu.edu.cn
(End) Patricia Vannier [CDS] 16-Apr-2025