The Mystery of Photometric Twins DES17X1boj and DES16E2bjy

Pursiainen, M and Gutierrez, G and Desai, Shantanu and et al, . (2020) The Mystery of Photometric Twins DES17X1boj and DES16E2bjy. Monthly Notices of the Royal Astronomical Society, 494 (4). pp. 1-14. ISSN 0035-8711

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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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IITH Creators:

IITH Creators	ORCiD
Desai, Shantanu	http://orcid.org/0000-0002-0466-3288

Item Type:

Article

Additional Information:

This research used resources of the National Energy Research Scientific Computing Center (NERSC), a US Department of Energy Office of Science User Facility operated under Contract No. DEAC02- 05CH11231.

Uncontrolled Keywords:

supernovae: General

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

Team Library

Date Deposited:

04 Dec 2019 05:06

Last Modified:

24 Nov 2022 11:38