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iPTF16abc and the population of Type Ia supernovae: comparing the photospheric, transitional, and nebular phases

Dhawan, S. and Bulla, M. and Goobar, A. and Lunnan, R. and Johansson, J. and Fransson, C and Kulkarni, S. R. and Papadogiannakis, S. and Miller, A. A. (2018) iPTF16abc and the population of Type Ia supernovae: comparing the photospheric, transitional, and nebular phases. Monthly Notices of the Royal Astronomical Society, 480 (2). pp. 1445-1456. ISSN 0035-8711.

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Key information about the progenitor system and the explosion mechanism of Type Ia supernovae (SNe Ia) can be obtained from early observations, within a few days from explosion. iPTF16abc was discovered as a young SN Ia with excellent early time data. Here, we present photometry and spectroscopy of the SN in the nebular phase. A comparison of the early time data with a sample of SNe Ia shows distinct features, differing from normal SNe Ia at early phases but similar to normal SNe Ia at a few weeks after maximum light (i.e. the transitional phase) and well into the nebular phase. The transparency time-scales (t_0) for this sample of SNe Ia range between ∼25 and 41 d indicating a diversity in the ejecta masses. t_0 also weakly correlates with the peak bolometric luminosity, consistent with the interpretation that SNe with higher ejecta masses would produce more ^(56)Ni . Comparing the t_0 and the maximum luminosity, L_(max) distribution of a sample of SNe Ia to predictions from a wide range of explosion models we find an indication that the sub-Chandrasekhar mass models span the range of observed values. However, the bright end of the distribution can be better explained by Chandrasekhar mass delayed detonation models, hinting at multiple progenitor channels to explain the observed bolometric properties of SNe Ia. iPTF16abc appears to be consistent with the predictions from the M_(ch) models.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bulla, M.0000-0002-8255-5127
Goobar, A.0000-0002-4163-4996
Lunnan, R.0000-0001-9454-4639
Johansson, J.0000-0001-5975-290X
Fransson, C0000-0001-8532-3594
Kulkarni, S. R.0000-0001-5390-8563
Papadogiannakis, S.0000-0003-0783-3323
Miller, A. A.0000-0001-9515-478X
Additional Information:© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2018 July 9. Received 2018 June 11; in original form 2018 February 2. We would like to thank Peter Nugent for pointing us to the DECaLS photometry of iPTF16abc. We acknowledge fruitful comments from Jesper Sollerman. Funding from the Swedish Research Council, the Swedish Space Board, and the Knut & Alice (K&A) Wallenberg foundation made this research possible. A.A.M. is funded by the Large Synoptic Survey Telescope Corporation in support of the Data Science Fellowship Program. This work made use of the Heidelberg Supernova Model Archive (HESMA),
Group:Palomar Transient Factory, Astronomy Department
Funding AgencyGrant Number
Swedish Research CouncilUNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Knut and Alice Wallenberg FoundationUNSPECIFIED
Large Synoptic Survey Telescope CorporationUNSPECIFIED
Subject Keywords:supernovae: general, supernova: individual (iPTF16abc)
Issue or Number:2
Record Number:CaltechAUTHORS:20181205-163501667
Persistent URL:
Official Citation:S Dhawan, M Bulla, A Goobar, R Lunnan, J Johansson, C Fransson, S R Kulkarni, S Papadogiannakis, A A Miller; iPTF16abc and the population of Type Ia supernovae: comparing the photospheric, transitional, and nebular phases, Monthly Notices of the Royal Astronomical Society, Volume 480, Issue 2, 21 October 2018, Pages 1445–1456,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91527
Deposited By: George Porter
Deposited On:06 Dec 2018 22:21
Last Modified:21 Nov 2019 23:26

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