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Miller, AA, Kasliwal, MM, Cao, Y, Adams, SM, Goobar, A, Knezevic, S, Laher, RR, Lunnan, R, Masci, FJ, Nugent, PE, Perley, DA, Petrushevska, T, Quimby, RM, Rebbapragada, UD, Sollerman, J, Taddia, F and Kulkarni, SR (2017) Color Me Intrigued: The Discovery of iPTF 16fnm, an SN 2002cx-like Object. Astrophysical Journal, 848 (1). ISSN 0004-637X
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Color Me Intrigued The Discovery of iPTF 16fnm, an SN 2002cx-like Object.pdf - Accepted Version Download (1MB) | Preview |
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 g PTF and R PTF 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 ${M}_{{g}_{\mathrm{PTF}}}=-15.09\pm 0.17\,\mathrm{mag}$, 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 ${r}_{{N}_{02{cx}}/{N}_{\mathrm{Ia}}}={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.
| 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; IOP Publishing |
| Related URLs: | |
| Date Deposited: | 21 Feb 2018 12:29 |
| Last Modified: | 04 Sep 2021 10:44 |
| DOI or ID number: | 10.3847/1538-4357/aa8c7e |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/8100 |
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