J/ApJ/769/39 SN Ibn PS1-12sk optical and NIR light curves (Sanders+, 2013)
PS1-12sk is a peculiar supernova from a He-rich progenitor system in a
brightest cluster galaxy environment.
Sanders N.E., Soderberg A.M., Foley R.J., Chornock R., Milisavljevic D.,
Margutti R., Drout M.R., Moe M., Berger E., Brown W.R., Lunnan R.,
Smartt S.J., Fraser M., Kotak R., Magill L., Smith K.W., Wright D.,
Huang K., Urata Y., Mulchaey J.S., Rest A., Sand D.J., Chomiuk L.,
Friedman A.S., Kirshner R.P., Marion G.H., Tonry J.L., Burgett W.S.,
Chambers K.C., Hodapp K.W., Kudritzki R.P., Price P.A.
<Astrophys. J., 769, 39 (2013)>
=2013ApJ...769...39S 2013ApJ...769...39S
ADC_Keywords: Photometry, infrared ; Photometry, ugriz ; Supernovae ;
Photometry, ultraviolet
Keywords: galaxies: clusters: general; galaxies: star formation;
stars: winds, outflows; supernovae: general;
supernovae: individual: PS1-12sk
Abstract:
We report on our discovery and observations of the Pan-STARRS1
supernova (SN) PS1-12sk, a transient with properties that indicate
atypical star formation in its host galaxy cluster or pose a challenge
to popular progenitor system models for this class of explosion. The
optical spectra of PS1-12sk classify it as a Type Ibn SN (SN Ibn;
cf. SN 2006jc), dominated by intermediate-width (3x103km/s) and time
variable He I emission. Our multi-wavelength monitoring establishes
the rise time dt ∼9-23 days and shows an NUV-NIR spectral energy
distribution with temperature ≳17x103K and a peak magnitude of
Mz=-18.88±0.02mag. SN Ibn spectroscopic properties are commonly
interpreted as the signature of a massive star (17-100M☉)
explosion within an He-enriched circumstellar medium. However, unlike
previous SNe Ibn, PS1-12sk is associated with an elliptical brightest
cluster galaxy, CGCG 208-042 (z=0.054) in cluster RXC J0844.9+4258.
The expected probability of an event like PS1-12sk in such
environments is low given the measured infrequency of core-collapse
SNe in red-sequence galaxies compounded by the low volumetric rate of
SN Ibn. Furthermore, we find no evidence of star formation at the
explosion site to sensitive limits
(ΣHα≲2x10-3M☉/yr/kpc2). We therefore discuss
white dwarf binary systems as a possible progenitor channel for
SNe Ibn. We conclude that PS1-12sk represents either a fortuitous and
statistically unlikely discovery, evidence for a top-heavy initial
mass function in galaxy cluster cooling flow filaments, or the first
clue suggesting an alternate progenitor channel for SNe Ibn.
Description:
After discovery with PS1 on MJD 55997, we monitored the optical
evolution of PS1-12sk through MJD 56049 (see Figure 3). The PS1
observations are obtained through a set of five broadband filters,
which we have designated as gP1, rP1, iP1, zP1, and yP1.
Additional ugriz imaging was acquired with the 2.0m Liverpool
Telescope with the optical CCD camera RATCam from MJD 56015-56039.
UV/optical observations of PS1-12sk with the Swift-UVOT instrument
were acquired from MJD 56013-56032.
We obtained NIR photometry of PS1-12sk using simultaneous JHK imaging
from the robotic 1.3m Peters Automated Infrared Imaging Telescope
(PAIRITEL) at Mount Hopkins, Arizona in 18 epochs from MJD 56013-56034.
We obtained further imaging of PS1-12sk with WIRCAM on the 3.6m
Canada-France-Hawaii Telescope (CFHT). NIR J-, H-, and Ks-band
observations were carried out on MJD 56021 and 56028.
Objects:
-------------------------------------------------
RA (ICRS) DE Designation(s)
-------------------------------------------------
08 44 54.86 +42 58 16.9 PS1-12sk = PS1-12sk
-------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 32 119 PS1-12sk optical/NIR photometry
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See also:
J/ApJ/763/42 : 28 SNe (IIn, Ibn or SLSN-I) X-ray emission (Ofek+, 2013)
J/ApJ/759/107 : Core-collapse SNe and host galaxies (Kelly+, 2012)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
J/A+A/544/A81 : Supernovae and their hosts in the SDSS DR8 (Hakobyan+, 2012)
J/MNRAS/416/3138 : SN 2009jf light curves (Valenti+, 2011)
J/MNRAS/412/1441 : SNe luminosity functions (Li+, 2011)
J/MNRAS/412/1419 : Nearby supernova rates (Leaman+, 2011)
J/ApJ/741/97 : Light curves of Ibc supernovae (Drout+, 2011)
J/AJ/137/4517 : UVOT light curves of supernovae (Brown+, 2009)
J/ApJ/706/599 : Hα and UV SFR in the local volume (Lee+, 2009)
J/ApJ/687/1201 : SN and LGRB locations in their host galaxies (Kelly+, 2008)
J/MNRAS/383/1485 : BVRI light curves of SN 2003jd (Valenti+, 2008)
J/ApJ/689/377 : NIR standard candles from PAIRITEL SN Ia (Wood-Vasey+, 2008)
J/ApJ/666/674 : ESSENCE supernova survey (Miknaitis+, 2007)
J/AJ/133/403 : Light curve of 11 type Ia supernovae (Garg+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 F7.1 d MJD Modified Julian Date of observation
9- 10 A2 --- Filt Filter used in the observation (u-z, U-W2, J-K)
12 A1 --- l_mag The 3σ upper limit flag on mag
14- 18 F5.2 mag mag [17.6/23.1] Observed AB magnitude in Filt
20- 23 F4.2 mag e_mag [0.01/0.4]? The 1σ uncertainty in mag
25- 32 A8 --- Inst Instrument used in the observation (PS1, RATCam,
Swift, PAIRITEL, CFHT)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 04-Dec-2014