Published 2007 | Version v1
Journal article Metadata-only

ESC and KAIT observations of the transitional type Ia SN 2004eo

Creators

  • 1. Max Planck Inst Astrophys, D-85741 Garching, (Germany)
  • 2. Queens Univ Belfast, Sch Math and Phys, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North (Ireland)
  • 3. Osserv Astron Trieste, INAF, I-34131 Trieste, (Italy)
  • 4. Pontificia Univ Catolica Chile, Dept Astron and Astrofis, Santiago 22, (Chile)
  • 5. Osserv Astron Padova, INAF, I-35122 Padua, (Italy)
  • 6. Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 (United States)
  • 7. Univ London Imperial Coll Sci Technol and Med, Blackett Lab, Astrophys Grp, London SW7 2AZ, (United Kingdom)
  • 8. Cent Astron Observ Pulkovo, St Petersburg 196140, (Russian Federation)
  • 9. Univ Paris 07, APC, CNRS, UMR 7164, F-75205 Paris 13, (France)
  • 10. Univ Padua, Dipartimento Astron, I-35122 Padua, (Italy)
  • 11. Univ Sydney, Sch Phys A28, Sydney, NSW 2006, (Australia)
  • 12. Osservatio Astron Collurania, INAF, I-64100 Teramo, (Italy)
  • 13. Univ La Laguna, E-38206 Tenerife, (Spain)
  • 14. European South Observ, D-85748 Garching, (Germany)
  • 15. St Petersburg Univ, Astron Inst, St Petersburg 198504, (Russian Federation)
  • 16. Univ Durham, Dept Phys, Durham DH1 3LE, (United Kingdom)
  • 17. Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, (Italy)
  • 18. Australian Natl Univ, Mt Stromlo and Siding Spring Observ, Res Sch Astron and Astrophys, Weston, ACT 2611, (Australia)
  • 19. Angloaustralian Observ, Epping, NSW 1710, (Australia)
  • 20. Stockholm Univ, Dept Phys, AlbaNova Univ Ctr, SE-10691 Stockholm, (Sweden)
  • 21. Univ Szeged, Dept Expt Phys, H-6720 Szeged, (Hungary)
  • 22. Univ Szeged, Astron Observ, H-6720 Szeged, (Hungary)
  • 23. Leopold Franzens Univ Innsbruck, Inst Astro and Teilchenphys, A-6020 Innsbruck, (Austria)
  • 24. CEA, DSM, DAPNIA, Serv Astrophys, F-91191 Gif Sur Yvette, (France)

Description

We present optical and infrared observations of the unusual Type Ia supernova (SN) 2004eo. The light curves and spectra closely resemble those of the prototypical SN 1992A, and the luminosity at maximum (MB = -19.08) is close to the average for a Type Ia supernova (SN Ia). However, the ejected 56Ni mass derived by modelling the bolometric light curve (about 0.45M.) lies near the lower limit of the 56Ni mass distribution observed in normal SNe Ia. Accordingly, SN 2004eo shows a relatively rapid post-maximum decline in the light curve [Δm15(B)(true) = 1.46], small expansion velocities in the ejecta and a depth ratio Si II λ 5972/ Si II λ 6355 similar to that of SN 1992A. The physical properties of SN 2004eo cause it to fall very close to the boundary between the faint, low-velocity gradient and high-velocity gradient subgroups proposed by Benetti et al. Similar behaviour is seen in a few other SNe Ia. Thus, there may in fact exist a few SNe Ia with intermediate physical properties. (authors)

Availability note (English)

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Additional details

Identifiers

DOI
10.1111/j.1365-2966.2007.11700.x;

Publishing Information

Journal Title
Monthly Notices of the Royal Astronomical Society
Journal Volume
377
Journal Issue
no.4
Journal Page Range
p. 1531-1552
ISSN
0035-8711

INIS

Country of Publication
United Kingdom
Country of Input or Organization
France
INIS RN
40108453
Subject category
S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
Descriptors DEI
COMPUTERIZED SIMULATION; INFRARED SPECTRA; LUMINOSITY; MONTE CARLO METHOD; NICKEL 56; OPTICAL SPECTROMETERS; PHOTOMETRY; SUPERNOVAE; TELESCOPES
Descriptors DEC
BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; BINARY STARS; CALCULATION METHODS; DAYS LIVING RADIOISOTOPES; ELECTRON CAPTURE RADIOISOTOPES; ERUPTIVE VARIABLE STARS; EVEN-EVEN NUCLEI; INTERMEDIATE MASS NUCLEI; ISOTOPES; MEASURING INSTRUMENTS; NICKEL ISOTOPES; NUCLEI; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; RADIOISOTOPES; SIMULATION; SPECTRA; SPECTROMETERS; STARS; VARIABLE STARS

Optional Information

Notes
63 refs.