Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

Rapidly Rising Transients in the Supernova - Superluminous Supernova Gap

Arcavi, I and Wolf, WM and Howell, DA and Bildsten, L and Leloudas, G and Hardin, D and Prajs, S and Perley, DA and Svirski, G and Gal-Yam, A and Katz, B and McCully, C and Cenko, SB and Lidman, C and Sullivan, M and Valenti, S and Astier, P and Balland, C and Carlberg, RG and Conley, A and Fouchez, D and Guy, J and Pain, R and Palanque-Delabrouille, N and Perrett, K and Pritchet, CJ and Regnault, N and Rich, J and Ruhlmann-Kleider, V (2016) Rapidly Rising Transients in the Supernova - Superluminous Supernova Gap. The Astrophysical Journal, 819 (1). ISSN 1538-4357

[img] Text
Arcavi_2016_ApJ_819_35.pdf - Published Version

Download (2MB)

Abstract

The American Astronomical Society. All rights reserved..We present observations of four rapidly rising (trise ≈ 10 days) transients with peak luminosities between those of supernovae (SNe) and superluminous SNe (Mpeak ap; -20) - one discovered and followed by the Palomar Transient Factory (PTF) and three by the Supernova Legacy Survey. The light curves resemble those of SN 2011kl, recently shown to be associated with an ultra-long-duration gamma-ray burst (GRB), though no GRB was seen to accompany our SNe. The rapid rise to a luminous peak places these events in a unique part of SN phase space, challenging standard SN emission mechanisms. Spectra of the PTF event formally classify it as an SN II due to broad Hα emission, but an unusual absorption feature, which can be interpreted as either high velocity Hα (though deeper than in previously known cases) or Si ii (as seen in SNe Ia), is also observed. We find that existing models of white dwarf detonations, CSM interaction, shock breakout in a wind (or steeper CSM), and magnetar spin down cannot readily explain the observations. We consider the possibility that a "Type 1.5 SN" scenario could be the origin of our events. More detailed models for these kinds of transients and more constraining observations of future such events should help to better determine their nature. © 2016.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 17 Feb 2017 12:22
Last Modified: 07 Sep 2017 13:03
DOI or Identification number: 10.3847/0004-637X/819/1/35
URI: http://researchonline.ljmu.ac.uk/id/eprint/5588

Actions (login required)

View Item View Item