Published in

Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 2020

DOI: 10.1093/mnras/staa995

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The Mystery of Photometric Twins DES17X1boj and DES16E2bjy

Journal article published in 2019 by M. Pursiainen ORCID, C. P. Gutiérrez, C. Gutierrez, P. Wiseman ORCID, M. Childress ORCID, M. Smith ORCID, C. Frohmaier ORCID, C. Angus ORCID, N. Castro Segura, N. Castro Segura, L. Kelsey ORCID, M. Sullivan, L. Galbany ORCID, P. Nugent, B. A. Bassett and other authors.
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Data provided by SHERPA/RoMEO

Abstract

Abstract We present an analysis of DES17X1boj and DES16E2bjy, two peculiar transients discovered by the Dark Energy Survey (DES). They exhibit nearly identical double-peaked light curves which reach very different maximum luminosities (Mr = −15.4 and Mr = −17.9, respectively). The light curve evolution of these events is highly atypical and has not been reported before. The transients are found in different host environments: DES17X1boj was found near the nucleus of a spiral galaxy, while DES16E2bjy is located in the outskirts of a passive red galaxy. Early photometric data is well fitted with a blackbody and the resulting moderate photospheric expansion velocities (1800 km/s for DES17X1boj and 4800 km/s for DES16E2bjy) suggest an explosive or eruptive origin. Additionally, a feature identified as high-velocity CaII absorption (v ≈ 9400km/s) in the near-peak spectrum of DES17X1boj may imply that it is a supernova. While similar light curve evolution suggests a similar physical origin for these two transients, we are not able to identify or characterise the progenitors.

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