Pursiainen, M;
Gutiérrez, CP;
Wiseman, P;
Childress, M;
Smith, M;
Frohmaier, C;
Angus, C;
... Wester, W; + view all
(2020)
The mystery of photometric twins DES17X1boj and DES16E2bjy.
Monthly Notices of the Royal Astronomical Society
, 494
(4)
pp. 5576-5589.
10.1093/mnras/staa995.
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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 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.
| Type: | Article |
|---|---|
| Title: | The mystery of photometric twins DES17X1boj and DES16E2bjy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/staa995 |
| Publisher version: | https://doi.org/10.1093/mnras/staa995 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | supernovae: general |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10103644 |
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