The Carbon-rich Type Ic SN 2007gr: The Photospheric Phase

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Published 2008 January 8 • © 2008. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, , Citation S. Valenti et al 2008 ApJ 673 L155 DOI 10.1086/527672

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Author affiliations

1 Dipartimento di Fisica, Universitá di Ferrara, via Paradiso 12, 44100 Ferrara, Italy

2 European Organization for Astronomical Research in the Southern Hemisphere, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany

3 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85741 Garching bei München, Germany

4 Department of Physics, Stockholm University, Stockholm, Sweden

5 INAF-Osservatorio Astronomico, vicolo dell'Osservatorio 5, 35122 Padova, Italy

6 Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK

7 Universitäts-Sternwarte München, Scheinenstrasse 1, 81679 München, Germany

8 Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, 85748 Garching bei München, Germany

9 Sternberg Astronomical Institute, Moscow University, Univeritetskii pr.13, Moscow 119992, Russia

10 Fundación Galileo Galilei-INAF, Telescopio Nazionale Galileo, E-38700 Santa Cruz de la Palma, Tenerife, Spain

11 Dipartimento di Astronomia, Universitá di Padova, vicolo dell'Osservatorio 2, 35122 Padova, Italy

12 Institut for Fysik og Astronomi, Aarhus Universitet, Ny Munkegade, Bygn. 1520, 8000 Aarhus C, Denmark

13 Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark

14 INAF-Osservatorio Astronomico, Via Tiepolo 11, 34143 Trieste, Italy

Dates

  1. Received 2007 November 23
  2. Accepted 2007 December 11
  3. Published
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1538-4357/673/2/L155

Abstract

The first 2 months of spectroscopic and photometric monitoring of the nearby Type Ic SN 2007gr are presented. The very early discovery (less than 5 days after the explosion) and the relatively short distance of the host galaxy motivated an extensive observational campaign. SN 2007gr shows an average peak luminosity but unusually narrow spectral lines and an almost flat photospheric velocity profile. The detection of prominent carbon features in the spectra is shown and suggests a wide range in carbon abundance in stripped-envelope supernovae. SN 2007gr may be an important piece in the puzzle of the observed diversity of CC SNe.

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10.1086/527672