AstroNote 2020-202

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DRAFT
2020-10-23 12:12:52
Type: Object/s-Discovery/Classification
Classification of AT 2020wey / ZTF20acitpfz as a Tidal Disruption Event in a Post-Starburst Galaxy
Authors: Iair Arcavi (Tel Aviv U), Jamison Burke (Las Cumbres / UCSB), Irura Nyiha (MIT), and Matt Nicholl (Birmingham)
Source Group: StarDestroyers
Abstract:
We report the classification of AT 2020wey / ZTF20acitpfz as a Tidal Disruption Event

We selected AT 2020wey / ZTF20acitpfz for classification based on its photometric properties, location in its host galaxy, and its host galaxy properties, by using the Lasair (Smith et al. 2019) 23TDE-candidates alert stream created by M. Nicholl, combined with the "E+A Galaxies" watchlist, which lists the pre-selected likely TDE host galaxies from French & Zabludoff 2018 (there is now a Lasair alert stream which combines all of these selection criteria: 23TDE-candidates-EA).

We obtained a spectrum with the Floyds spectroraph mounted on the Las Cumbres 2-meter Faulkes Telescope North in Haleakala, Hawaii, on 2020-10-22 13:20:16 UT as part of the StarDestroyers program (PI: I. Arcavi). The spectrum, which we make publicly available on the TNS, displays a strong broad emission feature consistent with He II 4686A, and possible broad Halpha emission on top of a blue continuum. As such it is likely a new member of the "TDE H+He" class (van Velzen et al. 2020).

The ZTF public light curve, as retrieved from Lasair, indicates that the event may be pre-peak. Swift observations have been requested, and ground-based optical followup is planned using the Las Cumbres Observatory Network.

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2020wey [ZTF20acitpfz]09:05:25.888+61:48:09.25TDE0.0273809:05:25.880+61:48:09.18TDE0.02738