J/ApJ/851/107ivo://CDS.VizieR/J/ApJ/851/107doi:10.26093/cds/vizier.18510107CDSWhitesides 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.2019-04-08T13:00:15Z2018-09-10T13:42:16ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomybroad-band-photometryultraviolet-astronomyWide-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 M_g_=-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.2017ApJ...851..107Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/851/107CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/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)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/851/107https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/851/107http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/851/107https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/851/107https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/851/107http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/851/107GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/851/107/table1Log of iPTF16asu photometric observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[57508.3/57596.3] Modified Julian Date of the observationdtime.epochdoublePhase[-12.5/61.6] Rest-frame days relative to bolometric maximum lightdtime.phasefloatFiltFilter used in the observation (g, r, i and u, B, V, UVM2, UVW1, UVW2)instr.setup;obscharl_magLimit flag on magmeta.code.errorcharmag[18.9.23.1] Apparent AB magnitude in Filt (1)magphot.magfloate_mag[0.03/0.2]? Uncertainty in magmagstat.error;phot.magfloatnullableTelTelescope used in the observation (2)instr.setup;obschar