Spectroscopic Classifications of Optical Transients with SOAR
ATel #8663; R. A. Hounsell, J. A. Miller, Y.-C. Pan, R. J. Foley (Illinois), A. Rest (STScI), S. W. Jha (Rutgers), D. Scolnic (Chicago/KICP), K. W. Smith, D. Wright, S. J. Smartt (QUB), M. Huber, K. C. Chambers, H. Flewelling, M. Willman, N. Primak, A. Schultz, B. Gibson, E. Magnier, C. Waters, J. Tonry, R. J. Wainscoat (IfA, Hawaii)
on 10 Feb 2016; 01:57 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (firstname.lastname@example.org)
Subjects: Optical, Supernovae
Referred to by ATel #: 8693
We report the following classifications of optical transients from
spectroscopic observations with the Goodman spectrograph (wavelength
range 3300 - 7100 A) on the SOAR telescope. Targets were supplied by
the Pan-STARRS Survey for Transients (PSST), the Catalina Real-Time
Transient Survey (CRTS), and the Backyard Observatory Supernova Search
(BOSS). All observations were made on 2016 Feb 9 UT. Classifications
were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
PS16aep | 08:16:24.59 | +25:59:35.2 | 0.045 | II | +3 weeks | (1)
PS16aer | 10:54:58.19 | +14:16:17.7 | 0.056 | Ia | -1 day | (2)
AT 2016aaj | 13:49:40.51 | +04:14:27.1 | 0.023 | II | ~peak | (3)
SN 2016adj | 13:25:24.11 | -43:00:57.5 | 0.002 | IIb? | | (4)
(1) PS16aep is also known as AT2016acq.
(2) PS16aer is also known as AT2016acs. We measure an Si II 6355 velocity
of -12,400 km/s.
(3) AT 2016aaj is also known as SNhunt303. We measure an H-alpha velocity
of -10,200 km/s.
(4) SN 2016adj was tentatively classified as a SN II (ATEL #8655), with
a revised classification as a SN Ib (ATEL #8657). Our spectrum is similar
to some SNe Ib, including SN 1999dn as mentioned in ATEL #8657. It is also
similar to some SNe II and IIb. There are strong features that likely
correspond to He I 5876 and He I 6678 with a common expansion velocity of
-7000 km/s. There is a strong feature at ~4560 A, which may be He II 4686
at a similar velocity. There is also another strong feature at 6415 A that
could correspond to H alpha at a similar velocity. While this last feature may
be something other than H alpha, we do not exclude the possibility that
SN 2016adj is a SN IIb.
When the redshift is given to 2 decimal places, it is derived
from the SN spectrum. Otherwise, the redshift is determined
from the host galaxy.