| Title: | Color Me Intrigued: The Discovery of iPTF 16fnm, an SN 2002cx-like Object |
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| Authors: | ID Miller, A. A., Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA (Author)
ID Petrushevska, Tanja, The Oskar Klein Centre, Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | Modern wide-field, optical time-domain surveys must solve a basic optimization problem: maximize the number of
transient discoveries or minimize the follow-up needed for the new discoveries. Here, we describe the Color Me
Intrigued experiment, the first from the intermediate Palomar Transient Factory (iPTF) to search for transients
simultaneously in the gPTF and RPTF bands. During the course of this experiment, we discovered iPTF 16fnm, a
new member of the 02cx-like subclass of Type Ia supernovae (SNe). iPTF 16fnm peaked at
Mg 15.09 0.17 mag PTF =- , making it the second-least-luminous known SN Ia. iPTF 16fnm exhibits all the
hallmarks of the 02cx-like class: (i) low luminosity at peak, (ii) low ejecta velocities, and (iii) a non-nebular
spectrum several months after peak. Spectroscopically, iPTF 16fnm exhibits a striking resemblance to two other
low-luminosity 02cx-like SNe: SN 2007qd and SN 2010ae. iPTF 16fnm and SN 2005hk decline at nearly the same
rate, despite a 3 mag difference in brightness at peak. When considering the full subclass of 02cx-like SNe, we do
not find evidence for a tight correlation between peak luminosity and decline rate in either the g′ or r′ band. We
measure the relative rate of 02cx-like SNe to normal SNe Ia and find rN N 02 Ia cx = 33-
+
25
158%. We further examine the
g′ − r′ evolution of 02cx-like SNe and find that their unique color evolution can be used to separate them from
91bg-like and normal SNe Ia. This selection function will be especially important in the spectroscopically
incomplete Zwicky Transient Facility/Large Synoptic Survey Telescope (LSST) era. Finally, we close by
recommending that LSST periodically evaluate, and possibly update, its observing cadence to maximize transient
science. |
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| Keywords: | methods: observational – surveys – supernovae: general – supernovae: individual (SN 2002cx, SN
2005hk, iPTF 16fnm) |
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| Publication version: | Version of Record |
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| Year of publishing: | 2017 |
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| Number of pages: | 13 |
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| Numbering: | 1, 848 |
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| PID: | 20.500.12556/RUNG-3575-5109ba11-0f7d-8abe-c108-45352ab9c7a3 |
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| COBISS.SI-ID: | 4999163 |
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| DOI: | 10.3847/1538-4357/aa8c7e |
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| NUK URN: | URN:SI:UNG:REP:RVEWDKXY |
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| Publication date in RUNG: | 23.01.2018 |
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| Views: | 3991 |
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| Downloads: | 0 |
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