Discovery Of The Ultra-Bright Type II-L Supernova 2008es

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dc.contributor.utaustinauthorWheeler, J. Craigen_US
dc.creatorGezari, S.en_US
dc.creatorHalpern, J. P.en_US
dc.creatorGrupe, D.en_US
dc.creatorYuan, F.en_US
dc.creatorQuimby, Roberten_US
dc.creatorMcKay, T.en_US
dc.creatorChamarro, D.en_US
dc.creatorSisson, M. D.en_US
dc.creatorAkerlof, C.en_US
dc.creatorWheeler, J. Craigen_US
dc.creatorBrown, Peter J.en_US
dc.creatorCenko, S. Bradleyen_US
dc.creatorRau, A.en_US
dc.creatorDjordjevic, J. O.en_US
dc.creatorTerndrup, D. M.en_US
dc.date.accessioned2016-04-28T19:40:55Z
dc.date.available2016-04-28T19:40:55Z
dc.date.issued2009-01en
dc.description.abstractWe report the discovery by the Robotic Optical Transient Search Experiment (ROTSE-IIIb) telescope of SN 2008es, an overluminous supernova (SN) at z = 0.205 with a peak visual magnitude of -22.2. We present multiwavelength follow-up observations with the Swift satellite and several ground-based optical telescopes. The ROTSE-IIIb observations constrain the time of explosion to be 23 +/- 1 rest-frame days before maximum. The linear decay of the optical light curve, and the combination of a symmetric, broad Ha emission line profile with broad P Cygni H beta and Na lambda 5892 profiles, are properties reminiscent of the bright Type II-L SNe 1979C and 1980K, although SN 2008es is greater than 10 times more luminous. The host galaxy is undetected in pre-supernova Sloan Digital Sky Survey images, and similar to Type II-L SN 2005ap (the most luminous SN ever observed), the host is most likely a dwarf galaxy with M(r) > - 17. Swift Ultraviolet/Optical Telescope observations in combination with Palomar 60 inch photometry measure the spectral energy distribution of the SN from 200 to 800 nm to be a blackbody that cools from 14000 K at the time of the optical peak to 6400 K 65 days later. The inferred blackbody radius is in good agreement with the radius expected for the expansion speed measured from the broad lines (10000 km s(-1)). The bolometric luminosity at the optical peak is 2.8 x 10(44) erg s(-1), with a total energy radiated over the next 65 days of 5.6 x 10(50) erg. The exceptional luminosity of SN 2008es requires an efficient conversion of kinetic energy produced from the core-collapse explosion into radiation. We favor a model in which the large peak luminosity is a consequence of the core collapse of a progenitor star with a low-mass extended hydrogen envelope and a stellar wind with a density close to the upper limit on the mass-loss rate measured from the lack of an X-ray detection by the Swift X-Ray Telescope.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNASA NAS5-00136, NNG-04WC41G, NNG06GH61G, NNX-07AF02G, NNX-08AN25G, AST 0707769en_US
dc.description.sponsorshipAustralian Research Councilen_US
dc.description.sponsorshipUniversity of New South Walesen_US
dc.description.sponsorshipUniversity of Texasen_US
dc.description.sponsorshipUniversity of Michiganen_US
dc.identifierdoi:10.15781/T2TN7Q
dc.identifier.Filename2009_01_supernova2008es.pdfen_US
dc.identifier.citationGezari, S., J. P. Halpern, D. Grupe, F. Yuan, R. Quimby, T. McKay, D. Chamarro et al. "Discovery of the Ultra-Bright Type II-L Supernova 2008es." The Astrophysical Journal, Vol. 690, No. 2 (Jan., 2009): 1313.en_US
dc.identifier.doi10.1088/0004-637x/690/2/1313en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35091
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectsupernovae: generalen_US
dc.subjectsupernovae: individual (sn 2008es)en_US
dc.subjectultraviolet:en_US
dc.subjectismen_US
dc.subjectlight curvesen_US
dc.subjectshock breakouten_US
dc.subjectubvri photometryen_US
dc.subjectnova 1979cen_US
dc.subjectsn 2006bpen_US
dc.subjecttelescopeen_US
dc.subjectmodelsen_US
dc.subjectemissionen_US
dc.subjectspectrumen_US
dc.subjectstarsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleDiscovery Of The Ultra-Bright Type II-L Supernova 2008esen_US
dc.typeArticleen_US

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