TNS Classification Report No. 11148 [ 2021TNSCR3640....1N ]
Date Received (UTC): 2021-10-25 22:44:05 Sender: Megan Newsome
Group: Global SN Project
Megan Newsome (UCSB/Las Cumbres), Yael Dgany (TAU), Iair Arcavi (TAU), Jamison Burke (LCO/UCSB), Daichi Hiramatsu (LCO/UCSB), D. Andrew Howell (LCO/UCSB), Curtis McCully (LCO/UCSB), Estefania Padilla Gonzalez (LCO/UCSB), Craig Pellegrino (LCO/UCSB) report/s a classification of object: SN 2021acej
Type: SN IaRedshift: 0.05
Remarks: Using Superfit (Howell et al. 2005, ApJ, 634, 1190) and SNID (Blondin & Tonry 2007, ApJ, 666, 1024), we find best fits to SNe Ia after maximum light, including SN 2008c 4 days after peak and SN 2007s 6 days after peak. The supernova is closest to 2MASS J20175477+0313574. SNID finds a best-fit redshift of z = 0.05. Using this redshift we measure a Si II 6355 velocity of approximately 10,000 km/s. Adopting the distance modulus computed from this redshift (36.6), the g-band absolute magnitude of the object roughly coeval with the spectrum is -18.58 (apparent magnitude 18.06, from ZTF). This absolute magnitude and velocity is consistent with an SN Ia after maximum light.
The following Classification spectrum was provided:
Obsdate: 2021-10-24 10:12:52
Instrument: FLOYDS-S
Telescope: Faulkes Telescope South
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2021acej
Date Received (UTC): 2021-10-25 22:44:05 Sender: Megan Newsome
Group: Global SN Project
Megan Newsome (UCSB/Las Cumbres), Yael Dgany (TAU), Iair Arcavi (TAU), Jamison Burke (LCO/UCSB), Daichi Hiramatsu (LCO/UCSB), D. Andrew Howell (LCO/UCSB), Curtis McCully (LCO/UCSB), Estefania Padilla Gonzalez (LCO/UCSB), Craig Pellegrino (LCO/UCSB) report/s a classification of object: SN 2021acej
Type: SN IaRedshift: 0.05
Remarks: Using Superfit (Howell et al. 2005, ApJ, 634, 1190) and SNID (Blondin & Tonry 2007, ApJ, 666, 1024), we find best fits to SNe Ia after maximum light, including SN 2008c 4 days after peak and SN 2007s 6 days after peak. The supernova is closest to 2MASS J20175477+0313574. SNID finds a best-fit redshift of z = 0.05. Using this redshift we measure a Si II 6355 velocity of approximately 10,000 km/s. Adopting the distance modulus computed from this redshift (36.6), the g-band absolute magnitude of the object roughly coeval with the spectrum is -18.58 (apparent magnitude 18.06, from ZTF). This absolute magnitude and velocity is consistent with an SN Ia after maximum light.
The following Classification spectrum was provided:
Obsdate: 2021-10-24 10:12:52
Instrument: FLOYDS-S
Telescope: Faulkes Telescope South
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2021acej