TNS Classification Report No. 6499 [ 2020TNSCR1105....1B ]
Date Received (UTC): 2020-04-22 22:20:58 Sender: Jamison Burke
Group: Global SN Project
Jamison Burke, Daichi Hiramatsu, D. Andrew Howell, Curtis McCully, Estefania Padilla Gonzalez, Craig Pellegrino report/s a classification of object: SN 2020hvf
Type: SN IaRedshift: 0.005838
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, including SN 1999aa 11 days before peak and other peculiar over-luminous SNe Ia. The supernova is closest to NGC 3643 (z = 0.005838, dL ~ 25 Mpc; 2004SDSS3.C...0000. NED values). We measure velocities of 25,000 km/s for the Ca II NIR triplet and 24,000 km/s for the Si II 6355 line, although we note the Si II is quite weak compared to other early SNe Ia. In addition to these high velocities we also note extremely strong O I absorption at comparable velocity, and probable detections of C II from the 4267 and 6580 lines. We measure a B-band absolute magnitude of -15.0 roughly coeval with this spectrum. From the high velocities, blue continuum, and absolute magnitude we infer that the supernova is within a few days of explosion, and we encourage further followup.
The following Classification spectrum was provided:
Obsdate: 2020-04-22 06:03:58
Instrument: FLOYDS-N
Telescope: Faulkes Telescope North
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2020hvf
Date Received (UTC): 2020-04-22 22:20:58 Sender: Jamison Burke
Group: Global SN Project
Jamison Burke, Daichi Hiramatsu, D. Andrew Howell, Curtis McCully, Estefania Padilla Gonzalez, Craig Pellegrino report/s a classification of object: SN 2020hvf
Type: SN IaRedshift: 0.005838
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, including SN 1999aa 11 days before peak and other peculiar over-luminous SNe Ia. The supernova is closest to NGC 3643 (z = 0.005838, dL ~ 25 Mpc; 2004SDSS3.C...0000. NED values). We measure velocities of 25,000 km/s for the Ca II NIR triplet and 24,000 km/s for the Si II 6355 line, although we note the Si II is quite weak compared to other early SNe Ia. In addition to these high velocities we also note extremely strong O I absorption at comparable velocity, and probable detections of C II from the 4267 and 6580 lines. We measure a B-band absolute magnitude of -15.0 roughly coeval with this spectrum. From the high velocities, blue continuum, and absolute magnitude we infer that the supernova is within a few days of explosion, and we encourage further followup.
The following Classification spectrum was provided:
Obsdate: 2020-04-22 06:03:58
Instrument: FLOYDS-N
Telescope: Faulkes Telescope North
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2020hvf