Spectroscopic Classification of SN2019bvt as a Type Ia Supernova
ATel #12602; Sebastian Gomez, Allyson Bieryla, John Arban Lewis, Natasha Abrams, Peyton Benac, Michael Chenevey, Cydnee Colpaert, Omar Embaby, Jose Espinel, Nicole Gordon, Mma Ikwut-Ukwa, Benjamin Porter, Alaina Richert, Devin Sullivan, Sarah Zia, Edo Berger (Harvard University)
on 20 Mar 2019; 23:12 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Sebastian Gomez (sgomez@cfa.harvard.edu)
Subjects: Optical, Supernovae, Transient
We report on photometric and spectroscopic observations of SN2019bvt, a transient originally discovered by the Zwicky Transient Facility (ZTF; Bellm & Kulkarni 2017; ATel #11266). For photometric observations, we used the KeplerCam imager on the 48" telescope at the Fred Lawrence Whipple Observatory. For spectroscopic observations, we used the low-resolution FAST spectrograph on the 60" telescope at the same observatory. The spectra are made available on the Transient Name Server.
We performed image subtraction on our images using existing archival PS1 images as templates, and measure an r-band magnitude of 16.6(0.05) at MJD = 58562.3879. To classify the transient we cross-correlate our spectrum to those of known supernovae using SNID (Blondin & Tonry, 2007, ApJ, 666, 1024), and obtain a good match to a normal Type Ia SN near peak, consistent with the rising light curve. We measure the redshift from host galaxy emission lines to be z = 0.0169, consistent with the inferred value we obtain from SNID template matching.
| Nam | RA (J2000) | DEC (J2000) | Redshift | Class | Spectral Phase | Obs. mag | Obs. date |
|-----------|-------------|--------------|----------|-------|----------------|----------------|------------|
| SN2019bvt | 18:28:48.50 | +50:22:23.20 | 0.0169 | SN Ia | ~ max | r = 16.6(0.05) | 2019-03-20 |
This classification was done as part of Astro100: Methods of Observational Astronomy; an undergraduate course at Harvard University.