Time-Varying Potassium in High-Resolution Spectra of the Type Ia Supernova 2014J
Abstract
We present a time series of the highest resolution spectra yet published for the nearby Type Ia supernova (SN Ia) 2014J in M82. They were obtained at 11 epochs over 33 days around peak brightness with the Levy Spectrograph (resolution R ≈ 110,000) on the 2.4 m Automated Planet Finder telescope at Lick Observatory. We identify multiple Na i D and K i absorption features as well as absorption by Ca ii H&K and several of the more common diffuse interstellar bands (DIBs). We see no evolution in any component of Na i D, Ca ii, or in the DIBs, but do establish the dissipation/weakening of the two most blueshifted components of K i. We present several potential physical explanations, finding the most plausible to be photoionization of circumstellar material, and discuss the implications of our results with respect to the progenitor scenario of SN 2014J.
Additional Information
© 2015 The American Astronomical Society. Received 2014 November 30; accepted 2015 January 16; published 2015 March 12. Based on observations made with the Levy Spectrometer on the 2.4 m APF telescope at Lick Observatory. We thank Ken and Gloria Levy for their generous contribution to the funding of the spectrometer, without which this unique time series of spectra of SN 2014J in M82 would have been impossible. We thank the Lick staff for their assistance. We gratefully acknowledge Ferdinando Patat, Helen Kirk, Sarah Sadavoy, Christopher F. McKee, and Richard McCray for helpful discussions. The supernova research of A.V.F.'s group at U.C. Berkeley is supported by Gary and Cynthia Bengier, the Richard and Rhoda Goldman Fund, the Christopher R. Redlich Fund, the TABASGO Foundation, and NSF grant AST-1211916. We also acknowledge NASA/HST grant GO-13286 from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. K. J. S. is supported by NASA through the Astrophysics Theory Program (NNX15AB16G). This work has also used the Weizmann Interactive Supernova Data Repository (WISEREP) at www.weizmann.ac.il/astrophysics/wiserep. Facilities: APF - .Attached Files
Published - Graham_2015_ApJ_801_136.pdf
Submitted - 1412.0653.pdf
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Additional details
- Eprint ID
- 88831
- Resolver ID
- CaltechAUTHORS:20180815-135647549
- Gary and Cynthia Bengier
- Richard and Rhoda Goldman Fund
- Christopher R. Redlich Fund
- TABASGO Foundation
- AST-1211916
- NSF
- GO-13286
- NASA Hubble Fellowship
- NAS 5-26555
- NASA
- NNX15AB16G
- NASA
- Created
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2018-08-15Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field