121. iPTF Discovery of Recent Type Ia SupernovaeLaura Hangard, Tanja Petrushevska, 2016, other component parts Abstract: The intermediate Palomar Transient Factory (ATel #4807) reports the discovery and classification of the following Type Ia SNe. Our automated candidate vetting to distinguish a real astrophysical source (1.0) from bogus artifacts (0.0) is powered by three generations of machine learning algorithms: RB2 (Brink et al. 2013MNRAS.435.1047B), RB4 (Rebbapragada et al. 2015AAS...22543402R) and RB5 (Wozniak et al. 2013AAS...22143105W).
Keywords: Supernovae, Transient
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122. iPTF Discoveries of Recent Type Ia SupernovaeRaphael Ferretti, Tanja Petrushevska, 2016, other component parts Abstract: The intermediate Palomar Transient Factory (ATel #4807) reports the discovery and classification of the following Type Ia SNe. Our automated candidate vetting to distinguish a real astrophysical source (1.0) from bogus artefacts (0.0) is powered by three generations of machine learning algorithms: RB2 (Brink et al. 2013MNRAS.435.1047B), RB4 (Rebbapragada et al. 2015AAS...22543402R) and RB5 (Wozniak et al. 2013AAS...22143105W).
Keywords: Supernovae, Transient
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124. iPTF Discoveries of Recent Core-Collapse SupernovaeFrancesco Taddia, Tanja Petrushevska, 2016, other component parts Abstract: Abstract
The intermediate Palomar Transient Factory (ATel #4807) reports the discovery and classification of the following core-collapse SNe. Our automated candidate vetting to distinguish a real astrophysical source (1.0) from bogus artifacts (0.0) is powered by three generations of machine learning algorithms: RB2 (Brink et al. 2013MNRAS.435.1047B), RB4 (Rebbapragada et al. 2015AAS...22543402R) and RB5 (Wozniak et al. 2013AAS...22143105W).
Keywords: Supernovae, Transient
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125. iPTF Discoveries of Recent Type Ia Supernovae Authors:Semeli Papadogiannakis, Tanja Petrushevska, 2016, other component parts Abstract: The intermediate Palomar Transient Factory (ATel #4807) reports the discovery and classification of the following Type Ia SNe. Our automated candidate vetting to distinguish a real astrophysical source (1.0) from bogus artefacts (0.0) is powered by three generations of machine learning algorithms: RB2 (Brink et al. 2013MNRAS.435.1047B), RB4 (Rebbapragada et al. 2015AAS...22543402R) and RB5 (Wozniak et al. 2013AAS...22143105W).
Keywords: Supernovae, Transient
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128. VizieR Online Data Catalog: Measured photometry of SN 2014J from HST (Amanullah+, 2014)R. Amanullah, Tanja Petrushevska, complete scientific database of research data Abstract: We obtained observations (Program DD-13621; PI: Goobar) of SN 2014J with HST in the four UV broadband filters F218W, F225W, F275W, and F336W for seven epochs using a total of seven HST orbits during Cycle 21. In addition to this we also obtained optical broad-, medium-, and narrowband photometry in filters F467M, F631N, and F845M for visits (1, 3) and optical broadband photometry using F438W, F555W, and F814W for the remaining five visits. All observations were obtained with the Wide-Field Camera-3 (WFC3) using the UVIS aperture UVIS2-C512C-SUB.
Keywords: Supernovae, Photometry: HST, Photometry: UBVRI, Photometry: infrared, Extinction
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129. Color Me Intrigued: The Discovery of iPTF 16fnm, an SN 2002cx-like ObjectA. A. Miller, Tanja Petrushevska, 2017, original scientific article 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.
Keywords: methods: observational – surveys – supernovae: general – supernovae: individual (SN 2002cx, SN
2005hk, iPTF 16fnm)
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130. Supernovae seen through gravitational telescopesTanja Petrushevska, 2017, doctoral dissertation Abstract: Gravitational lenses such as galaxies and galaxy clusters, can magnify the flux of background galaxies. These galaxies at high redshift can host supernovae (SNe) which, thanks to the magnification boost due to lensing, can be observed, otherwise too faint to be detected by current telescopes. Under the right circumstances, the background galaxies may also have multiple images due to the strong lensing. Of particular interest is to detect lensed supernovae of type Ia (SNe Ia), because of their standard brightness. They could help improve lensing models and, if multiple images are observed, the Hubble constant can be measured independently.
In this thesis, we use galaxy clusters as gravitational telescopes to search for lensed SNe at high redshift. We performed ground-based, near-infrared and optical search campaigns towards the massive clusters Abell 1689 and 370, which are among the most powerful gravitational telescopes known. Our search resulted in the discovery of five photometrically classified, core- collapse SNe at redshifts of 0.671 < z < 1.703 with significant magnification from the cluster. Owing to the power of the lensing cluster, we calculated the volumetric core-collapse SN rates for 0.4 z < 2.9, and find good agreement with previous estimates and predictions from cosmic star formation history. During our survey, we also discovered two SNe Ia in A1689 cluster members, which allowed us to determine the cluster Ia rate. Furthermore, we discuss the expectations of finding lensed SNe at high redshift in simulated search campaigns that can be conducted with upcoming ground- and space-based telescopes.
Magnification from a galaxy lens also allows for detailed studies of the SN properties at high redshift that otherwise would not be possible. Spec- troscopic observations of lensed high-redshift SNe Ia are of particular interest since they can be used to test for evolution of the standard candle nature of these objects. However, if systematic redshift-dependent properties are found, their utility for future surveys could be challenged. We investigate whether the properties of the strongly lensed and very distant SN Ia PS1- 10afx at z = 1.4, deviates from the well-studied nearby and intermediate populations of normal SNe Ia. In other study, we report the discovery of the first resolved multiply-imaged gravitationally lensed SN Ia.
Keywords: supernovae, gravitational telescopes, galaxy clusters, lensed supernovae, strong lensing, astronomical surveys and telescopes
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