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ASASSN-14ae: a tidal disruption event at 200 Mpc

Holoien, TW-S and Prieto, JL and Bersier, D and Kochanek, CS and Stanek, KZ and Shappee, BJ and Grupe, D and Basu, U and Beacom, JF and Brimacombe, J and Brown, JS and Davis, AB and Jencson, J and Pojmanski, G and Szczygiel, DM (2014) ASASSN-14ae: a tidal disruption event at 200 Mpc. Monthly Notices of the Royal Astronomical Society, 445 (3). pp. 3263-3277. ISSN 0035-8711

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Abstract

ASASSN-14ae is a candidate tidal disruption event (TDE) found at the centre of SDSS J110840.11+340552.2 (d ≃ 200 Mpc) by the All-Sky Automated Survey for Supernovae (ASAS-SN). We present ground-based and Swift follow-up photometric and spectroscopic observations of the source, finding that the transient had a peak luminosity of L ≃ 8 × 1043 erg s−1 and a total integrated energy of E ≃ 1.7 × 1050 erg radiated over the ∼5 months of observations presented. The blackbody temperature of the transient remains roughly constant at T ∼ 20 000 K while the luminosity declines by nearly 1.5 orders of magnitude during this time, a drop that is most consistent with an exponential, L ∝ e-t/t 0 with t0 ≃ 39 d. The source has broad Balmer lines in emission at all epochs as well as a broad He ii feature emerging in later epochs. We compare the colour and spectral evolution to both supernovae and normal AGN to show that ASASSN-14ae does not resemble either type of object and conclude that a TDE is the most likely explanation for our observations. At z = 0.0436, ASASSN-14ae is the lowest-redshift TDE candidate discovered at optical/UV wavelengths to date, and we estimate that ASAS-SN may discover 0.1–3 of these events every year in the future.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 28 Nov 2016 11:31
Last Modified: 28 Nov 2016 11:31
DOI or Identification number: 10.1093/mnras/stu1922
URI: http://researchonline.ljmu.ac.uk/id/eprint/4879

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