The mystery of photometric twins DES17X1boj and DES16E2bjy

Published

Journal Article

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 that reach very different maximum luminosities (Mr = −15.4 and −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 are well fitted with a blackbody and the resulting moderate photospheric expansion velocities (1800  km s−1 for DES17X1boj and 4800  km s−1 for DES16E2bjy) suggest an explosive or eruptive origin. Additionally, a feature identified as high-velocity Ca ii absorption ($v$ ≈ 9400 km s−1) 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 characterize the progenitors.

Full Text

Duke Authors

Cited Authors

  • Pursiainen, M; Gutiérrez, CP; Wiseman, P; Childress, M; Smith, M; Frohmaier, C; Angus, C; Castro Segura, N; Kelsey, L; Sullivan, M; Galbany, L; Nugent, P; Bassett, BA; Brout, D; Carollo, D; D’Andrea, CB; Davis, TM; Foley, RJ; Grayling, M; Hinton, SR; Inserra, C; Kessler, R; Lewis, GF; Lidman, C; Macaulay, E; March, M; Möller, A; Müller, T; Scolnic, D; Sommer, NE; Swann, E; Thomas, BP; Tucker, BE; Vincenzi, M; Abbott, TMC; Allam, S; Annis, J; Avila, S; Bertin, E; Brooks, D; Buckley-Geer, E; Burke, DL; Carnero Rosell, A; Carrasco Kind, M; da Costa, LN; De Vicente, J; Desai, S; Diehl, HT; Doel, P; Eifler, TF; Everett, S; Flaugher, B; Frieman, J; García-Bellido, J; Gaztanaga, E; Gerdes, DW; Gruen, D; Gruendl, RA; Gschwend, J; Gutierrez, G; Hollowood, DL; Honscheid, K; James, DJ; Kim, AG; Krause, E; Kuehn, K; Maia, MAG; Marshall, JL; Menanteau, F; Miquel, R; Ogando, RLC; Palmese, A; Paz-Chinchón, F; Plazas, AA; Roodman, A; Sanchez, E; Scarpine, V; Schubnell, M; Serrano, S; Sevilla-Noarbe, I; Suchyta, E; Swanson, MEC; Tarle, G; Wester, W

Published Date

  • June 1, 2020

Published In

Volume / Issue

  • 494 / 4

Start / End Page

  • 5576 - 5589

Published By

Electronic International Standard Serial Number (EISSN)

  • 1365-2966

International Standard Serial Number (ISSN)

  • 0035-8711

Digital Object Identifier (DOI)

  • 10.1093/mnras/staa995

Language

  • en