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DES14X3taz: A Type I Superluminous Supernova Showing a Luminous, Rapidly Cooling Initial Pre-Peak Bump

Smith, M. and Sullivan, M. and D'Andrea, Chris B. and Castander, Francisco and Casas, R. (2016) DES14X3taz: A Type I Superluminous Supernova Showing a Luminous, Rapidly Cooling Initial Pre-Peak Bump. Astrophysical Journal Letters, 818 (1). Art. No. L8. ISSN 2041-8213. doi:10.3847/2041-8205/818/1/l8.

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We present DES14X3taz, a new hydrogen-poor superluminous supernova (SLSN-I) discovered by the Dark Energy Survey (DES) supernova program, with additional photometric data provided by the Survey Using DECam for Superluminous Supernovae. Spectra obtained using Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy on the Gran Telescopio CANARIAS show DES14X3taz is an SLSN-I at z = 0.608. Multi-color photometry reveals a double-peaked light curve: a blue and relatively bright initial peak that fades rapidly prior to the slower rise of the main light curve. Our multi-color photometry allows us, for the first time, to show that the initial peak cools from 22,000 to 8000 K over 15 rest-frame days, and is faster and brighter than any published core-collapse supernova, reaching 30% of the bolometric luminosity of the main peak. No physical 56Ni-powered model can fit this initial peak. We show that a shock-cooling model followed by a magnetar driving the second phase of the light curve can adequately explain the entire light curve of DES14X3taz. Models involving the shock-cooling of extended circumstellar material at a distance of ≃400 R⊙ are preferred over the cooling of shock-heated surface layers of a stellar envelope. We compare DES14X3taz to the few double-peaked SLSN-I events in the literature. Although the rise times and characteristics of these initial peaks differ, there exists the tantalizing possibility that they can be explained by one physical interpretation.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Smith, M.0000-0002-3321-1432
Sullivan, M.0000-0001-9053-4820
Castander, Francisco0000-0001-7316-4573
Additional Information:© 2016 The American Astronomical Society. Received 2015 December 15; accepted 2016 January 19; published 2016 February 3. We acknowledge support from EU/FP7-ERC grants 615929 and 307260, STFC, NSF grant AST-1518052, and a Weizmann-UK Grant. Based on observations made with the Gran Telescopio Canarias (GTC), at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofsica de Canarias. Funding for the DES Projects has been provided by the DOE and NSF (USA), MEC/MICINN/MINECO (Spain), STFC (UK), HEFCE (UK), NCSA (UIUC), KICP (U. Chicago), CCAPP (Ohio State), MIFPA (Texas A&M), CNPQ, FAPERJ, FINEP (Brazil), DFG (Germany), and the Collaborating Institutions in the Dark Energy Survey. The Collaborating Institutions are Argonne Lab, UC Santa Cruz, University of Cambridge, CIEMAT-Madrid, University of Chicago, University College London, DES-Brazil Consortium, University of Edinburgh, ETH Zürich, Fermilab, University of Illinois, ICE (IEEC-CSIC), IFAE Barcelona, Lawrence Berkeley Lab, LMU München, and the associated Excellence Cluster universe, University of Michigan, NOAO, University of Nottingham, Ohio State University, University of Pennsylvania, University of Portsmouth, SLAC National Lab, Stanford University, University of Sussex, and Texas A&M University. The DES Data Management System is supported by the NSF under grant number AST-1138766. The DES participants from Spanish institutions are partially supported by MINECO under grants AYA2012-39559, ESP2013-48274, FPA2013-47986, and Centro de Excelencia Severo Ochoa SEV-2012-0234. Research leading to these results has received funding from the ERC including grants 240672, 291329, and 306478. Facilities: Blanco - Cerro Tololo Inter-American Observatory's 4 meter Blanco Telescope, GTC - Gran Telescopio CANARIAS 10.4m telescope (GRANTECAN).
Group:Palomar Transient Factory
Subject Keywords:supernovae: general
Issue or Number:1
Record Number:CaltechAUTHORS:20190604-152202944
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Official Citation:M. Smith et al 2016 ApJL 818 L8
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96126
Deposited By: Tony Diaz
Deposited On:04 Jun 2019 22:30
Last Modified:16 Nov 2021 17:18

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