FDST spectroscopic classification of SN 2019be

ATel #12362; C. Inserra (Cardiff University), C. P. Gutierrez (University of Southampton), J. Anderson (ESO), C. Angus (University of Southampton), R. Cartier (CTIO), T.-W. Chen (MPE), T. de Jaeger (UC Berkeley) C. Frohmaier (University of Portsmouth - ICG), L. Galbany (University of Pittsburg), S. Gonzalez-Gaitan (CENTRA), M. Grayling (University of Southampton), H. Kuncarayakti (University of Turku), J. Lyman (University of Warwick), T. Muller-Bravo (University of Southampton), A. Pastorello (INAF - Padova Astronomical Observatory) M. Pursiainen (University of Southampton), R. Roy (IUCAA), T. Schweyer (MPE), M. Smith (University of Southampton), M. Sullivan (University of Southampton), P. Wiseman (University of Southampton).
on 7 Jan 2019; 13:00 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Cosimo Inserra (InserraC@cardiff.ac.uk)

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FDST is the Fast and Dark Side of Transients experiment (FDST, PIs: Inserra & Gutierrez) uses the Liverpool Telescope (LT, Steele et al. 2004) and the SPRAT (Piascik et al 2014) spectrograph. The main goal of the project is collecting high-quality spectroscopic and photometric data of three types of extreme objects, so far poorly monitored:
1. Rapidly evolving transients;
2. Transients hosted in low-luminosity galaxies;
3. Transients located in the remote outskirts of the host galaxies.
Our legacy value is to provide well-sampled panchromatic light curves to train machine-learning classifiers in preparation for the Large Synoptic Survey Telescope (LSST) era.
We aim to provide 30 of such transients per year and classify any supernova matching our selection criteria visible from the LT site.

Here we report our first spectroscopic classification. The object, AT2019be, was discovered by the ATLAS survey (see Tonry et al. 2011, PASP, 123, 58 and Tonry et al. ATel #8680) and reported to the Transient Name Server (TNS). Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

The observations were performed on 2019-01-05 using SPRAT (Piascik et al 2014) on the Liverpool Telescope (Steele et al. 2004).

 
Survey Name | IAU Name    | RA (J2000)  | Dec (J2000) | Disc. Date  | Source | Disc Mag |  z    |     Type       | Phase      | Notes 
ATLAS19aar  | SN2019be    | 13:00:14.5  | +27:57:24.4 |  20190102   |  ATLAS |   18.98  | 0.02  | Ia 1991bg-like | around max | (1) 

(1) The redshift is obtained by SNID and is consistent with the Coma Cluster. Adopting a standard cosmology with H0 = 70 km/s/Mpc, we obtain a distance modulus of 34.7 mag. This gives a current absolute magnitude of about -16.34. Based on the light curve, the object seems still rising. SN2019be is located ~8" away from SN2008dx, which was another type Ia 1991bg-like.