J/ApJ/851/107 iPTF 16asu photometry follow-up (Whitesides+, 2017)
iPTF 16asu: a luminous, rapidly evolving, and high-velocity supernova.
Whitesides L., Lunnan R., Kasliwal M.M., Perley D.A., Corsi A., Cenko S.B.,
Blagorodnova N., Cao Y., Cook D.O., Doran G.B., Frederiks D.D., Fremling C.,
Hurley K., Karamehmetoglu E., Kulkarni S.R., Leloudas G., Masci F.,
Nugent P.E., Ritter A., Rubin A., Savchenko V., Sollerman J., Svinkin D.S.,
Taddia F., Vreeswijk P., Wozniak P.
<Astrophys. J., 851, 107 (2017)>
=2017ApJ...851..107W 2017ApJ...851..107W
ADC_Keywords: Supernovae; Photometry, ugriz; Ultraviolet
Keywords: gamma-ray burst: general ; shock waves ; stars: magnetars ;
supernovae: general ; supernovae: individual (iPTF 16asu)
Abstract:
Wide-field surveys are discovering a growing number of rare transients
whose physical origin is not yet well understood. Here we present
optical and UV data and analysis of intermediate Palomar Transient
Factory (iPTF) 16asu, a luminous, rapidly evolving, high-velocity,
stripped-envelope supernova (SN). With a rest-frame rise time of just
four days and a peak absolute magnitude of Mg=-20.4mag, the light
curve of iPTF 16asu is faster and more luminous than that of previous
rapid transients. The spectra of iPTF 16asu show a featureless blue
continuum near peak that develops into an SN Ic-BL spectrum on the
decline. We show that while the late-time light curve could plausibly
be powered by 56Ni decay, the early emission requires a different
energy source. Nondetections in the X-ray and radio strongly constrain
the energy coupled to relativistic ejecta to be at most comparable to
the class of low-luminosity gamma-ray bursts (GRBs). We suggest that
the early emission may have been powered by either a rapidly
spinning-down magnetar or by shock breakout in an extended envelope of
a very energetic explosion. In either scenario a central engine is
required, making iPTF 16asu an intriguing transition object between
superluminous SNe, SNe Ic-BL, and low-luminosity GRBs.
Description:
iPTF 16asu was discovered by the intermediate Palomar Transient
Factory and was first detected in data taken with the 48" Samuel
Oschin Telescope at the Palomar Observatory (P48) on 2016 May 11.26 UT.
We obtained a spectrum with the Double Beam Spectrograph (DBSP) on the
200" Hale Telescope at the Palomar Observatory (P200) on 2016 May 14.3.
A later spectrum taken on 2016 June 04 by the Deep Imaging
Multi-object Spectrograph (DEIMOS) on the 10m Keck II Telescope on
2016 Jun 04 shows SN features consistent with an SN Ic-BL.
iPTF 16asu was detected in a nightly cadence g band experiment with
iPTF, and we therefore have P48 data covering the time up to explosion
as well as the early rise. Subsequent photometry was obtained with the
automated 60" telescope at Palomar (P60) in the gri bands.
Our last photometric observation came from the 3.58m Telescopio
Nazionale Galileo (TNG).
We obtained a sequence of eight low-resolution spectra, spanning 2016
May to 2017 Apr, for iPTF 16asu using the DBSP on P200, the Andalucia
Faint Object Spectrograph and Camera (ALFOSC) on the 2.56m Nordic
Optical Telescope (NOT), the Device Optimized for the Low Resolution
(DOLORES) on TNG, the Low-resolution Imaging Spectrometer (LRIS) on
Keck I, and the DEIMOS on the 10m Keck II Telescope.
We observed the field of iPTF 16asu with the Karl G. Jansky Very Large
Array (VLA) on two epochs (Program VLA/16B-043; PI: A. Corsi). The
first observation was carried out starting on 2016 June 13, 01:18:22
UT (MJD 57552), with the VLA in its B configuration. The second
observation was carried out with the VLA in its A configuration,
starting on 2017 January 10, 09:43:06 UT (MJD 57763).
Three epochs of Swift UVOT and XRT data were obtained at phases
corresponding to 7.4, 13.4, and 19.2 days after explosion.
Objects:
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RA (ICRS) DE Designation(s) (z)
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12 59 09.28 +13 48 09.2 iPTF 16asu = iPTF 16asu (z=0.187)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 105 Log of iPTF16asu photometric observations
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See also:
J/ApJ/617/240 : Oxygen abundances in the GOODS-North field (Kobulnicky+, 2004)
J/ApJ/690/1358 : Spectra of unusual optical transient SCP 06F6 (Barbary+, 2009)
J/ApJ/720/1513 : The afterglows of Swift-era GRBs. I. (Kann+, 2010)
J/other/Nat/463.513 : Radio observations of SN 2009bb (Soderberg+, 2010)
J/AJ/141/163 : Ultimate LC of SN 1998bw/GRB 980425 (Clocchiatti+, 2011)
J/ApJ/746/156 : Radio afterglow observations of GRBs (Chandra+, 2012)
J/ApJ/747/L5 : R-band observations of PTF 10vgv (Corsi+, 2012)
J/ApJS/213/19 : Optical and near-IR light curves of 64 SNe (Bianco+, 2014)
J/ApJ/794/23 : Pan-STARRS1 transients optical photometry (Drout+, 2014)
J/ApJ/781/37 : Multi-band photometry of GRB 130427A (Perley+, 2014)
J/A+A/574/A60 : Light curve templates of SNe Ib/c from SDSS (Taddia+, 2015)
J/ApJ/819/35 : Light curves of 4 transients from PTF & SNLS (Arcavi+, 2016)
J/A+A/593/A68 : PTF12os & iPTF13bvn spectra and light curves (Fremling+, 2016)
J/ApJ/827/90 : Spectroscopy of SNe Ib, IIb and Ic (Liu+, 2016)
J/ApJ/832/108 : Spectral properties of Type Ic & Ic-bl SNe (Modjaz+, 2016)
J/ApJ/830/13 : Host-galaxy NUV-NIR data of superluminous SNe (Perley+, 2016)
J/ApJ/836/60 : Bgri light curves of PTF11kmb and PTF12bho (Lunnan+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 d MJD [57508.3/57596.3] Modified Julian Date of
the observation
10- 15 F6.2 d Phase [-12.5/61.6] Rest-frame days relative to
bolometric maximum light
17- 20 A4 --- Filt Filter used in the observation (g, r, i and
u, B, V, UVM2, UVW1, UVW2)
22- 22 A1 --- l_mag Limit flag on mag
24- 28 F5.2 mag mag [18.9.23.1] Apparent AB magnitude in Filt (1)
30- 33 F4.2 mag e_mag [0.03/0.2]? Uncertainty in mag
35- 39 A5 --- Tel Telescope used in the observation (2)
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Note (1): Corrected for Galactic extinction.
Note (2): Telescope as follows:
P48 = the 48-inch Samuel Oschin Telescope at the Palomar Observatory --
21 occurrences;
P60 = the automated 60-inch telescope at Palomar -- 63 occurrences;
Swift = Swift/UVOT -- 18 occurrences
TNG = the 3.58m Telescopio Nazionale Galileo -- 3 occurrences.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Jul-2018