TNS Classification Report No. 10216 [ 2021TNSCR2591....1B ]
Date Received (UTC): 2021-07-28 20:47:56 Sender: Jamison Burke
Group: Global SN Project
Jamison Burke (LCO/UCSB), Yael Dgani (TAU), Iair Arcavi, Daichi Hiramatsu (LCO/UCSB), D. Andrew Howell, Curtis McCully, Megan Newsome, Estefania Padilla Gonzalez, Craig Pellegrino report/s a classification of object: SN 2021tnd
Type: SN IaRedshift: 0.083
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 near maximum light. The supernova is closest to SDSS J214857.26-090415.8. The best-fit redshift from snid is 0.083, which is what we adopt. Assuming this redshift we measure a Si II 6355 velocity of approximately 12,000 km/s. Adopting the distance modulus computed from this redshift (37.9), the r-band absolute magnitude of the object roughly coeval with the spectrum is -19.7 (apparent magnitude 18.3, from ZTF). This absolute magnitude and velocity is consistent with an SN Ia at maximum light.
The following Classification spectrum was provided:
Obsdate: 2021-07-27 15:56:47
Instrument: FLOYDS-S
Telescope: Faulkes Telescope South
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2021tnd
Date Received (UTC): 2021-07-28 20:47:56 Sender: Jamison Burke
Group: Global SN Project
Jamison Burke (LCO/UCSB), Yael Dgani (TAU), Iair Arcavi, Daichi Hiramatsu (LCO/UCSB), D. Andrew Howell, Curtis McCully, Megan Newsome, Estefania Padilla Gonzalez, Craig Pellegrino report/s a classification of object: SN 2021tnd
Type: SN IaRedshift: 0.083
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 near maximum light. The supernova is closest to SDSS J214857.26-090415.8. The best-fit redshift from snid is 0.083, which is what we adopt. Assuming this redshift we measure a Si II 6355 velocity of approximately 12,000 km/s. Adopting the distance modulus computed from this redshift (37.9), the r-band absolute magnitude of the object roughly coeval with the spectrum is -19.7 (apparent magnitude 18.3, from ZTF). This absolute magnitude and velocity is consistent with an SN Ia at maximum light.
The following Classification spectrum was provided:
Obsdate: 2021-07-27 15:56:47
Instrument: FLOYDS-S
Telescope: Faulkes Telescope South
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2021tnd