Extensive optical and near-infrared observations of the nearby, narrow-lined type Ic SN 2007gr: days 5 to 415
Deborah J. Hunter (1), Stefano Valenti (1), Rubina Kotak (1), Peter, Meikle (2), Stefan Taubenberger (3), Andrea Pastorello (1), Stefano Benetti, (4), Vallery Stanishev (4), Steven J. Smartt (1), Carrie Trundle (1), Arkady, A. Arkharov (5, 6), Milena Bufano (7)

TL;DR
This paper provides the most extensive optical and near-infrared observations of supernova SN 2007gr, revealing detailed light curves, spectra, and insights into its progenitor, explosion, and molecule formation, establishing it as a potential template for similar supernovae.
Contribution
It presents comprehensive multi-wavelength data of SN 2007gr, including light curves, spectra, and analysis of nucleosynthesis and molecule formation, offering new insights into type Ic supernovae.
Findings
Peak B-band magnitude of -16.8
Produced approximately 0.076 solar masses of 56Ni
Detected CO molecule indicating layered ejecta
Abstract
We present photometric and spectroscopic observations at optical and near-infrared wavelengths of the nearby type Ic SN 2007gr. These represent the most extensive data-set to date of any supernova of this sub-type, with frequent coverage from shortly after discovery to more than one year post-explosion. We deduce a rise time to B-band maximum of 11.5 \pm 2.7 days. We find a peak B-band magnitude of M_B=-16.8, and light curves which are remarkably similar to the so-called 'hypernova' SN 2002ap. In contrast, the spectra of SNe 2007gr and 2002ap show marked differences, not least in their respective expansion velocities. We attribute these differences primarily to the density profiles of their progenitor stars at the time of explosion i.e. a more compact star for SN 2007gr compared to SN 2002ap. From the quasi-bolometric light curve of SN 2007gr, we estimate that 0.076 0.010 Msun of…
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