Статья

Pan-STARRS1 DISCOVERY OF TWO ULTRALUMINOUS SUPERNOVAE AT<i>z</i>≈ 0.9

Laura ChomiukHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAR. ChornockHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAA. M. SoderbergHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAE. BergerHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USARoger A. ChevalierDepartment of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325, USAR. J. FoleyHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAM. E. HuberDepartment of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USAGautham NarayanDepartment of Physics, Harvard University, Cambridge, MA 02138, USAA. RestSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USASuvi GezariDepartment of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USAR. KirshnerHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAAdam G. RiessDepartment of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USAS. RodneyDepartment of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USAStephen SmarttAstrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKC. W. StubbsDepartment of Physics, Harvard University, Cambridge, MA 02138, USAJ. TonryInstitute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USAW. M. Wood‐VaseyDepartment of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, PA 15260, USAW. S. BurgettInstitute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USAK. C. ChambersInstitute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USAI. CzekalaHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAH. FlewellingInstitute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USAKarl FörsterCalifornia Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USAN. KaiserInstitute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USARolf‐Peter KudritzkiInstitute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USAE. A. MagnierInstitute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USAD. C. MartinCalifornia Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USAJohn MorganInstitute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USAJames D. NeillCalifornia Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USAP. A. PriceDepartment of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USAK. C. RothGemini Observatory, 670 North A'ohoku Place, Hilo, HI 96720, USANathan SandersHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAR. J. WainscoatInstitute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USA

2011en

ABI

Аннотация

We present the discovery of two ultra-luminous supernovae (SNe) at z ~ 0.9 with the Pan-STARRS1 Medium-Deep Survey. These SNe, PS1-10ky and PS1-10awh, are amongst the most luminous SNe ever discovered, comparable to the unusual transients SN 2005ap and SCP 06F6. Like SN 2005ap and SCP 06F6, they show characteristic high luminosities (M_bol ~ -22.5 mag), blue spectra with a few broad absorption lines, and no evidence for H or He. We have constructed a full multi-color light curve sensitive to the peak of the spectral energy distribution in the rest-frame ultraviolet, and we have obtained time-series spectroscopy for these SNe. Given the similarities between the SNe, we combine their light curves to estimate a total radiated energy over the course of explosion of (0.9-1.4) x 10^51 erg. We find photospheric velocities of 12,000-19,000 km/s with no evidence for deceleration measured across ~3 rest-frame weeks around light-curve peak, consistent with the expansion of an optically-thick massive shell of material. We show that, consistent with findings for other ultra-luminous SNe in this class, radioactive decay is not sufficient to power PS1-10ky, and we discuss two plausible origins for these events: the initial spin-down of a newborn magnetar in a core-collapse SN, or SN shock breakout from the dense circumstellar wind surrounding a Wolf-Rayet star.

Перевод пока недоступен

Идентификаторы

DOI: 10.1088/0004-637x/743/2/114

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar