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Supernova PTF 12glz: A Possible Shock Breakout Driven through an Aspherical Wind

Soumagnac, Maayane T. and Ofek, Eran O. and Gal-Yam, Avishay and Waxman, Eli and Ginzburg, Sivan and Strotjohann, Nora Linn and Schulze, Steve and Barlow, Tom A. and Behar, Ehud and Chelouche, Doron and Fremling, Christoffer and Ganot, Noam and Gezari, Suvi and Kasliwal, Mansi M. and Kaspi, Shai and Kulkarni, Shrinivas R. and Laher, Russ R. and Maoz, Dan and Martin, Christopher D. and Nakar, Ehud and Neill, James D. and Nugent, Peter E. and Poznanski, Dovi and Yaron, Ofer (2019) Supernova PTF 12glz: A Possible Shock Breakout Driven through an Aspherical Wind. Astrophysical Journal, 872 (2). Art. No. 141. ISSN 1538-4357. doi:10.3847/1538-4357/aafe84.

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We present visible-light and ultraviolet (UV) observations of the supernova PTF 12glz. The SN was discovered and monitored in the near-UV and R bands as part of a joint GALEX and Palomar Transient Factory campaign. It is among the most energetic SNe IIn observed to date (≈10^(51) erg). If the radiated energy mainly came from the thermalization of the shock kinetic energy, we show that PTF 12glz was surrounded by ~1 M⊙ of circumstellar material (CSM) prior to its explosive death. PTF 12glz shows a puzzling peculiarity: at early times, while the freely expanding ejecta are presumably masked by the optically thick CSM, the radius of the blackbody that best fits the observations grows at ≈7000 km s^(−1). Such a velocity is characteristic of fast moving ejecta rather than optically thick CSM. This phase of radial expansion takes place before any spectroscopic signature of expanding ejecta appears in the spectrum and while both the spectroscopic data and the bolometric luminosity seem to indicate that the CSM is optically thick. We propose a geometrical solution to this puzzle, involving an aspherical structure of the CSM around PTF 12glz. By modeling radiative diffusion through a slab of CSM, we show that an aspherical geometry of the CSM can result in a growing effective radius. This simple model also allows us to recover the decreasing blackbody temperature of PTF 12glz. SLAB-Diffusion, the code we wrote to model the radiative diffusion of photons through a slab of CSM and evaluate the observed radius and temperature, is made available online.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Soumagnac, Maayane T.0000-0001-6753-1488
Ofek, Eran O.0000-0002-6786-8774
Gal-Yam, Avishay0000-0002-3653-5598
Waxman, Eli0000-0002-9038-5877
Strotjohann, Nora Linn0000-0002-4667-6730
Schulze, Steve0000-0001-6797-1889
Chelouche, Doron0000-0002-4830-7787
Fremling, Christoffer0000-0002-4223-103X
Gezari, Suvi0000-0003-3703-5154
Kasliwal, Mansi M.0000-0002-5619-4938
Kaspi, Shai0000-0002-9925-534X
Kulkarni, Shrinivas R.0000-0001-5390-8563
Laher, Russ R.0000-0003-2451-5482
Martin, Christopher D.0000-0002-8650-1644
Nakar, Ehud0000-0002-4534-7089
Neill, James D.0000-0002-0466-1119
Nugent, Peter E.0000-0002-3389-0586
Poznanski, Dovi0000-0003-1470-7173
Yaron, Ofer0000-0002-0301-8017
Additional Information:© 2019 The American Astronomical Society. Received 2018 August 8; revised 2018 December 16; accepted 2018 December 28; published 2019 February 19. M.T.S. thanks Jonathan Morag, Adam Rubin, Yi Yang, Doron Kushnir, Anders Nyholm, and Chalsea Harris for useful discussions. M.T.S. acknowledges support by a grant from IMOS/ISA, the Ilan Ramon fellowship from the Israel Ministry of Science and Technology and the Benoziyo center for Astrophysics at the Weizmann Institute of Science. E.O.O. is grateful for the support by grants from the Israel Science Foundation, Minerva, Israeli Ministry of Science, the US-Israel Binational Science Foundation, the Weizmann Institute and the I-CORE Program of the Planning and Budgeting Committee and the Israel Science Foundation. A.G.-Y. is supported by the EU via ERC grant No. 725161, the Quantum Universe I-Core program, the ISF, the BSF Transformative program, IMOS via ISA and by a Kimmel award. This work is partly based on tools and data products produced by GAZPAR ( operated by CeSAM-LAM and IAP.
Group:Infrared Processing and Analysis Center (IPAC), Astronomy Department
Funding AgencyGrant Number
Ministry of Science and Technology (Israel)UNSPECIFIED
Weizmann Institute of ScienceUNSPECIFIED
Israel Science FoundationUNSPECIFIED
Binational Science Foundation (USA-Israel)UNSPECIFIED
I-CORE Program of the Planning and Budgeting CommitteeUNSPECIFIED
European Research Council (ERC)725161
Quantum Universe I-Core ProgramUNSPECIFIED
Subject Keywords:circumstellar matter – supernovae: general – supernovae: individual (PTF12glz) – ultraviolet: stars
Issue or Number:2
Record Number:CaltechAUTHORS:20190219-112939250
Persistent URL:
Official Citation:Maayane T. Soumagnac et al 2019 ApJ 872 141
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92976
Deposited By: Tony Diaz
Deposited On:19 Feb 2019 22:13
Last Modified:16 Nov 2021 16:54

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