Sifting for Sapphires: Systematic Selection of Tidal Disruption Events in iPTF

Hung, T.; Gezari, S.; Cenko, S. B.; Velzen, S. van; Blagorodnova, N.; Yan, Lin; Kulkarni, S. R.; Lunnan, R.; Kupfer, T.; Leloudas, G.; Kong, A. K.  H.; Nugent, P. E.; Fremling, C.; Laher, Russ R.; Masci, F. J.; Cao, Y.; Roy, R.; Petrushevska, T.

doi:10.3847/1538-4365/aad8b1

Title: Sifting for Sapphires: Systematic Selection of Tidal Disruption Events in iPTF

Journal Article · Thu Sep 27 00:00:00 EDT 2018 · The Astrophysical Journal. Supplement Series (Online)

DOI:https://doi.org/10.3847/1538-4365/aad8b1· OSTI ID:1479447

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^[4]; Laher, Russ R. ^[4];

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^[9]; Roy, R. ^[5]; Petrushevska, T. ^[5]

Univ. of Maryland, College Park, MD (United States)
Univ. of Maryland, College Park, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Univ. of Maryland, College Park, MD (United States); New York Univ. (NYU), NY (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Stockholm Univ. (Sweden)
Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
National Tsing Hua Univ., Hsinchu (Taiwan)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Washington, Seattle, WA (United States)

We present results from a systematic selection of tidal disruption events (TDEs) in a wide-area (4800~deg²), g+R band, Intermediate Palomar Transient Factory (iPTF) experiment. Our selection targets typical optically-selected TDEs: bright (>60\% flux increase) and blue transients residing in the center of red galaxies. Using photometric selection criteria to down-select from a total of 493 nuclear transients to a sample of 26 sources, we then use follow-up UV imaging with the Neil Gehrels Swift Telescope, ground-based optical spectroscopy, and light curve fitting to classify them as 14 Type Ia supernovae (SNe Ia), 9 highly variable active galactic nuclei (AGNs), 2 confirmed TDEs, and 1 potential core-collapse supernova. We find it possible to filter AGNs by employing a more stringent transient color cut (g-r< -0.2 mag); further, UV imaging is the best discriminator for filtering SNe, since SNe Ia can appear as blue, optically, as TDEs in their early phases. However, when UV-optical color is unavailable, higher precision astrometry can also effectively reduce SNe contamination in the optical. Our most stringent optical photometric selection criteria yields a 4.5:1 contamination rate, allowing for a manageable number of TDE candidates for complete spectroscopic follow-up and real-time classification in the ZTF era. We measure a TDE per galaxy rate of $$1.7^{+2.9}_{-1.3}$$ ×10^-4 gal^-1 yr^-1 (90% CL in Poisson statistics). This does not account for TDEs outside our selection criteria, thus may not reflect the total TDE population, which is yet to be fully mapped.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1479447

Journal Information:: The Astrophysical Journal. Supplement Series (Online), Vol. 238, Issue 2; ISSN 1538-4365

Publisher:: American Astronomical Society/IOPCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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Self-intersection of the fallback stream in tidal disruption events Lu, Wenbin; Bonnerot, Clément Monthly Notices of the Royal Astronomical Society, Vol. 492, Issue 1 https://doi.org/10.1093/mnras/stz3405	journal	December 2019
Identifying Tidal Disruption Events via Prior Photometric Selection of Their Preferred Hosts French, K. Decker; Zabludoff, Ann I. The Astrophysical Journal, Vol. 868, Issue 2 https://doi.org/10.3847/1538-4357/aaea64	journal	November 2018
Late-time UV Observations of Tidal Disruption Flares Reveal Unobscured, Compact Accretion Disks van Velzen, Sjoert; Stone, Nicholas C.; Metzger, Brian D. The Astrophysical Journal, Vol. 878, Issue 2 https://doi.org/10.3847/1538-4357/ab1844	journal	June 2019
Discovery of Highly Blueshifted Broad Balmer and Metastable Helium Absorption Lines in a Tidal Disruption Event Hung, T.; Cenko, S. B.; Roth, Nathaniel The Astrophysical Journal, Vol. 879, Issue 2 https://doi.org/10.3847/1538-4357/ab24de	journal	July 2019
A New Class of Changing-look LINERs Frederick, Sara; Gezari, Suvi; Graham, Matthew J. The Astrophysical Journal, Vol. 883, Issue 1 https://doi.org/10.3847/1538-4357/ab3a38	journal	September 2019
Implications from Late-time X-Ray Detections of Optically Selected Tidal Disruption Events: State Changes, Unification, and Detection Rates Jonker, P. G.; Stone, N. C.; Generozov, A. The Astrophysical Journal, Vol. 889, Issue 2 https://doi.org/10.3847/1538-4357/ab659c	journal	February 2020
Late-time UV observations of tidal disruption flares reveal unobscured, compact accretion disks van Velzen, Sjoert; Stone, Nicholas C.; Metzger, Brian D. arXiv https://doi.org/10.48550/arxiv.1809.00003	text	January 2018
Discovery of Highly Blueshifted Broad Balmer and Metastable Helium Absorption Lines in a Tidal Disruption Event Hung, T.; Cenko, S. B.; Roth, Nathaniel arXiv https://doi.org/10.48550/arxiv.1903.05637	text	January 2019
Polarimetry of relativistic tidal disruption event Swift J2058+0516 Wiersema, K.; Higgins, A. B.; Levan, A. J. arXiv https://doi.org/10.48550/arxiv.1910.11624	text	January 2019
Radio Properties of Tidal Disruption Events Alexander, Kate D.; van Velzen, Sjoert; Horesh, Assaf Space Science Reviews, Vol. 216, Issue 5 https://doi.org/10.1007/s11214-020-00702-w	journal	June 2020
Atmospheric Pollution Mapping of the Yangtze River Basin: An AQI-Based Weighted Co-Word Analysis Song, Yu; Liu, Bingrui; Chen, Xiaohong International Journal of Environmental Research and Public Health, Vol. 17, Issue 3 https://doi.org/10.3390/ijerph17030817	journal	January 2020
Radiative Emission Mechanisms of Tidal Disruption Events Roth, Nathaniel; Rossi, Elena M.; Krolik, Julian H. arXiv https://doi.org/10.48550/arxiv.2008.01117	text	January 2020

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