H{sub α} SPECTRAL DIVERSITY OF TYPE II SUPERNOVAE: CORRELATIONS WITH PHOTOMETRIC PROPERTIES

Journal Article · Sat May 10 04:00:00 EDT 2014 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/786/2/L15· OSTI ID:22365859

Gutiérrez, Claudia P.; Hamuy, Mario; González-Gaitán, Santiago ^[1]; Anderson, Joseph P. ^[2]; Folatelli, Gastón ^[3]; Morrell, Nidia I.; Phillips, Mark M.; Thomas-Osip, Joanna ^[4]; Stritzinger, Maximilian D. ^[5]; McCarthy, Patrick ^[6]

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1. Millennium Institute of Astrophysics, Casilla 36-D, Santiago (Chile)
2. Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago (Chile)
3. Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan)
4. Carnegie Observatories, Las Campanas Observatory, Casilla 601, La Serena (Chile)
5. Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C (Denmark)
6. Observatories of the Carnegie Institution for Science, Pasadena, CA 91101 (United States)

We present a spectroscopic analysis of the H{sub α} profiles of hydrogen-rich Type II supernovae. A total of 52 Type II supernovae having well-sampled optical light curves and spectral sequences were analyzed. Concentrating on the H{sub α} P-Cygni profile we measure its velocity from the FWHM of the emission and the ratio of absorption to emission (a/e) at a common epoch at the start of the recombination phase, and search for correlations between these spectral parameters and photometric properties of the V-band light curves. Testing the strength of various correlations we find that a/e appears to be the dominant spectral parameter in terms of describing the diversity in our measured supernova properties. It is found that supernovae with smaller a/e have higher H{sub α} velocities, more rapidly declining light curves from maximum during the plateau and radioactive tail phase, are brighter at maximum light, and have shorter optically thick phase durations. We discuss possible explanations of these results in terms of physical properties of Type II supernovae, speculating that the most likely parameters that influence the morphologies of H{sub α} profiles are the mass and density profile of the hydrogen envelope, together with additional emission components due to circumstellar interaction.

• OSTI ID: 22365859
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 2 Vol. 786; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ABSORPTION
CORRELATIONS
DENSITY
DIAGRAMS
HYDROGEN
MASS
MORPHOLOGY
PHOTOMETRY
RECOMBINATION
TYPE II SUPERNOVAE
VELOCITY
VISIBLE RADIATION