{
  "id": "2201.08936",
  "version": "v1",
  "published": "2022-01-22T01:37:05.000Z",
  "updated": "2022-01-22T01:37:05.000Z",
  "title": "Optical Rebrightening of Extragalactic Transients from the Zwicky Transient Facility",
  "authors": [
    "Monika Soraisam",
    "Thomas Matheson",
    "Chien-Hsiu Lee",
    "Abhijit Saha",
    "Gautham Narayan",
    "Nicholas Wolf",
    "Adam Scott",
    "Stephanie Figuereo",
    "Rafael Nunuez",
    "Kevin McKinnon",
    "Puragra Guhathakurta",
    "Thomas Brink",
    "Alexei Filippenko",
    "Nathan Smith"
  ],
  "comment": "Accepted for publication in ApJ Letters",
  "categories": [
    "astro-ph.HE",
    "astro-ph.SR"
  ],
  "abstract": "Ongoing large-scale optical time-domain surveys, such as the Zwicky Transient Facility (ZTF), are producing alerts at unprecedented rates. Analysis of transient sources has so far followed two distinct paths: archival analysis of data on transient sources at a time when they are no longer observable and real-time analysis at the time when the sources are first detected. The latter is the realm of alert brokers such as the Arizona-NOIRLab Temporal Analysis and Response to Events System (ANTARES). In this paper, we synthesize the two analysis paths and present a first systematic study of archival alert-broker data, focusing on extragalactic transients with multipeaked light curves identified in the ANTARES archive of ZTF alerts. Our analysis yields a sample of 37 such sources, including core-collapse supernovae (with two analogs of iPTF14hls), thermonuclear supernovae interacting with their surrounding circumstellar medium, tidal disruption events, luminous blue variables, and as yet unclassified objects. A large fraction of the identified sources is currently active, warranting allocation of follow-up resources in the immediate future to further constrain their nature and the physical processes at work.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-01-22T01:37:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "zwicky transient facility",
      "extragalactic transients",
      "optical rebrightening",
      "transient sources",
      "ongoing large-scale optical time-domain surveys"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}