PTF10ops – a subluminous, normal-width light curve Type Ia supernova in the middle of nowhere

PTF10ops is a Type Ia supernova (SN Ia), whose light curve and spectral properties place it outside the current SN Ia subtype classifications. Its spectra display the characteristic lines of subluminous SNe Ia, but it has a normal-width light curve with a long rise time, typical of normal-luminosity SNe Ia. The early-time optical spectra of PTF10ops were modelled using a spectral fitting code and found to have all the lines typically seen in subluminous SNe Ia, without the need to invoke more uncommon elements. The host galaxy environment of PTF10ops is also unusual with no galaxy detected at the position of the SN down to an absolute limiting magnitude of r≥−12.0 mag, but a very massive galaxy is present at a separation of ∼148 kpc and at the same redshift as suggested by the SN spectral features. The progenitor of PTF10ops is most likely a very old star, possibly in a low-metallicity environment, which affects its explosion mechanism and observational characteristics. PTF10ops does not easily fit into any of the current models of either subluminous or normal SN Ia progenitor channels.

[1]  Laurent Mazuray,et al.  Optical Design and Engineering IV , 2011 .

[2]  M. Sullivan,et al.  SNLS3: CONSTRAINTS ON DARK ENERGY COMBINING THE SUPERNOVA LEGACY SURVEY THREE-YEAR DATA WITH OTHER PROBES , 2011, 1104.1444.

[3]  M. Sullivan,et al.  THE SUBLUMINOUS AND PECULIAR TYPE Ia SUPERNOVA PTF 09dav , 2011, 1103.1797.

[4]  Nial R. Tanvir,et al.  PAndAS’ PROGENY: EXTENDING THE M31 DWARF GALAXY CABAL , 2011, 1102.2902.

[5]  Juan C. Meza,et al.  SYNAPPS: Data-Driven Analysis for Supernova Spectroscopy , 2011 .

[6]  Enrico Ramirez-Ruiz,et al.  PRELUDE TO A DOUBLE DEGENERATE MERGER: THE ONSET OF MASS TRANSFER AND ITS IMPACT ON GRAVITATIONAL WAVES AND SURFACE DETONATIONS , 2011, 1101.5132.

[7]  I. Hook,et al.  SUBLUMINOUS TYPE Ia SUPERNOVAE AT HIGH REDSHIFT FROM THE SUPERNOVA LEGACY SURVEY , 2010, 1011.4531.

[8]  M. Sullivan,et al.  Galaxy Zoo Supernovae , 2010, 1011.2199.

[9]  Mansi M. Kasliwal,et al.  HUBBLE SPACE TELESCOPE STUDIES OF NEARBY TYPE Ia SUPERNOVAE: THE MEAN MAXIMUM LIGHT ULTRAVIOLET SPECTRUM AND ITS DISPERSION , 2010, 1010.2211.

[10]  Richard Walters,et al.  RAPIDLY DECAYING SUPERNOVA 2010X: A CANDIDATE “.Ia” EXPLOSION , 2010, 1009.0960.

[11]  Ryan Chornock,et al.  Observed Fractions of Core-Collapse Supernova Types and Initial Masses of their Single and Binary Progenitor Stars , 2010, 1006.3899.

[12]  Richard Walters,et al.  CORE-COLLAPSE SUPERNOVAE FROM THE PALOMAR TRANSIENT FACTORY: INDICATIONS FOR A DIFFERENT POPULATION IN DWARF GALAXIES , 2010, 1004.0615.

[13]  M. Sullivan,et al.  The dependence of Type Ia Supernovae luminosities on their host galaxies , 2010, 1003.5119.

[14]  R. Nichol,et al.  THE RISE AND FALL OF TYPE Ia SUPERNOVA LIGHT CURVES IN THE SDSS-II SUPERNOVA SURVEY , 2010, 1001.3428.

[15]  R. Kirshner,et al.  SN 2006bt: A PERPLEXING, TROUBLESOME, AND POSSIBLY MISLEADING TYPE Ia SUPERNOVA , 2009, 0912.0263.

[16]  W. Hillebrandt,et al.  Sub-luminous type Ia supernovae from the mergers of equal-mass white dwarfs with mass ∼0.9M⊙ , 2009, Nature.

[17]  J. Vanderplas,et al.  FIRST-YEAR SLOAN DIGITAL SKY SURVEY-II SUPERNOVA RESULTS: HUBBLE DIAGRAM AND COSMOLOGICAL PARAMETERS , 2009, 0908.4274.

[18]  D. Kasen,et al.  COLLISIONS OF WHITE DWARFS AS A NEW PROGENITOR CHANNEL FOR TYPE Ia SUPERNOVAE , 2009, 0907.3196.

[19]  Ernest E. Croner,et al.  The Palomar Transient Factory: System Overview, Performance, and First Results , 2009, 0906.5350.

[20]  Oxford,et al.  Exploring the Optical Transient Sky with the Palomar Transient Factory , 2009, 0906.5355.

[21]  E. O. Ofek,et al.  A faint type of supernova from a white dwarf with a helium-rich companion , 2009, Nature.

[22]  L. Bildsten,et al.  GLOBULAR CLUSTERS AS TESTBEDS FOR TYPE Ia SUPERNOVAE , 2009, 0903.1104.

[23]  Armin Rest,et al.  CfA3: 185 TYPE Ia SUPERNOVA LIGHT CURVES FROM THE CfA , 2009, 0901.4787.

[24]  I. Hook,et al.  THE EFFECT OF PROGENITOR AGE AND METALLICITY ON LUMINOSITY AND 56Ni YIELD IN TYPE Ia SUPERNOVAE , 2008, 0810.0031.

[25]  Psu,et al.  SN 2007ax: An Extremely Faint Type Ia Supernova , 2008, 0807.0660.

[26]  M. Sullivan,et al.  SiFTO: An Empirical Method for Fitting SN Ia Light Curves , 2008, 0803.3441.

[27]  S. E. Persson,et al.  The underluminous Type Ia supernova 2005bl and the class of objects similar to SN 1991bg , 2007, 0711.4548.

[28]  A. Pastorello,et al.  SN 2003du: 480 days in the life of a normal type Ia supernova , 2007, 0704.1244.

[29]  M. Sullivan,et al.  K-Corrections and Spectral Templates of Type Ia Supernovae , 2007, astro-ph/0703529.

[30]  M. Lehnert,et al.  The Milky Way: An Exceptionally Quiet Galaxy; Implications for the formation of spiral galaxies , 2007, astro-ph/0702585.

[31]  Stefano Casertano,et al.  New Hubble Space Telescope Discoveries of Type Ia Supernovae at z ≥ 1: Narrowing Constraints on the Early Behavior of Dark Energy , 2006, astro-ph/0611572.

[32]  N. F. Martin,et al.  Discovery and analysis of three faint dwarf galaxies and a globular cluster in the outer halo of the Andromeda galaxy , 2006, astro-ph/0607472.

[33]  D. Kasen.  Secondary Maximum in the Near-Infrared Light Curves of Type Ia Supernovae , 2006, astro-ph/0606449.

[34]  M. C. Cooper,et al.  The Metal-poor Halo of the Andromeda Spiral Galaxy (M31) , 2006, astro-ph/0605170.

[35]  J. Neill,et al.  Gemini Spectroscopy of Supernovae from the Supernova Legacy Survey: Improving High-Redshift Supernova Selection and Classification , 2005, astro-ph/0509195.

[36]  S. Jha,et al.  Chemistry and Star Formation in the Host Galaxies of Type Ia Supernovae , 2005, astro-ph/0508180.

[37]  D. Branch,et al.  Comparative Direct Analysis of Type Ia Supernova Spectra. I. SN 1994D , 2005, 0712.2436.

[38]  R. Kotak,et al.  The Diversity of Type Ia Supernovae: Evidence for Systematics? , 2004, astro-ph/0411059.

[39]  Christophe Bonnaud,et al.  SNIFS: a wideband integral field spectrograph with microlens arrays , 2003, SPIE Optical Systems Design.

[40]  W. M. Wood-Vasey,et al.  The Type Ia Supernova 1999aw: A Probable 1999aa-like Event in a Low-Luminosity Host Galaxy , 2002, astro-ph/0207409.

[41]  P. Nugent,et al.  K‐Corrections and Extinction Corrections for Type Ia Supernovae , 2002, astro-ph/0205351.

[42]  D. Borgne,et al.  Photometric redshifts from evolutionary synthesis with PÉGASE: The code Z-PEG and the z=0 age constraint , 2002, astro-ph/0202359.

[43]  S. Jha,et al.  The Luminosity of SN 1999by in NGC 2841 and the Nature of “Peculiar” Type Ia Supernovae , 2001, astro-ph/0105490.

[44]  Walter A. Siegmund,et al.  The Sloan Digital Sky Survey: Technical Summary , 2000, astro-ph/0006396.

[45]  D. Schlegel,et al.  Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds , 1998 .

[46]  A. Riess,et al.  Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant , 1998, astro-ph/9805201.

[47]  D. Schlegel,et al.  Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds , 1997, astro-ph/9710327.

[48]  P. Nugent,et al.  Evidence for a Spectroscopic Sequence among Type Ia Supernovae , 1995, astro-ph/9510004.

[49]  Baron,et al.  Low Hubble constant from the physics of type Ia supernovae. , 1995, Physical review letters.

[50]  L. Marschall,et al.  UBVRI Photometry of the Type Ia SN 1994D in NGC 4526 , 1995 .

[51]  Harland W. Epps,et al.  THE KECK LOW-RESOLUTION IMAGING SPECTROMETER , 1995 .

[52]  M. Phillips,et al.  The Absolute Magnitudes of Type IA Supernovae , 1993 .

[53]  L. Ho,et al.  The subluminous spectroscopically peculiar type Ia supernova 1991bg in the elliptical galaxy NGC 4374 , 1992 .

[54]  S. Bergh.  The stellar populations of M 33 , 1991 .

[55]  J. Mathis,et al.  The relationship between infrared, optical, and ultraviolet extinction , 1989 .

[56]  Alan Uomoto,et al.  THE TYPE IA SUPERNOVA 1986G IN NGC 5128 : OPTICAL PHOTOMETRY AND SPECTRA. , 1987 .

[57]  Yu. P. Pskovskii,et al.  Photometric classification and basic parameters of type I supernovae , 1984 .

[58]  J. B. Oke,et al.  Secondary standard stars for absolute spectrophotometry , 1983 .

[59]  W. Arnett.  Type I supernovae. I. Analytic solutions for the early part of the light curve , 1982 .

[60]  J. Kurfess,et al.  Accepted for Publication in the Astrophysical Journal on the Evolution of the Dense Core Mass Function , 1998 .

[61]  Jan Peters,et al.  SN 1991bg - A type Ia supernova with a difference , 1993 .