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Delayed circumstellar interaction for Type Ia SN 2015cp revealed by an HST ultraviolet imaging survey

Delayed circumstellar interaction for Type Ia SN 2015cp revealed by an HST ultraviolet imaging survey
Delayed circumstellar interaction for Type Ia SN 2015cp revealed by an HST ultraviolet imaging survey
The nature and role of the binary companion of carbon-oxygen white dwarf stars that explode as Type Ia supernovae (SNe Ia) are not yet fully understood. Past detections of circumstellar material (CSM) that contain hydrogen for a small number of SN Ia progenitor systems suggest that at least some have a nondegenerate companion. In order to constrain the prevalence, location, and quantity of CSM in SN Ia systems, we performed a near-ultraviolet (NUV) survey with the Hubble Space Telescope (HST) to look for the high-energy signature of SN Ia ejecta interacting with CSM. Our survey revealed that SN 2015cp, a SN 1991T-like overluminous SN Ia, was experiencing late-onset interaction between its ejecta and surrounding CSM at 664 days after its light-curve peak. We present ground- and spacebased follow-up observations of SN 2015cp that reveal optical emission lines of H and Ca, typical signatures of ejecta-CSM interaction. We show how SN 2015cp was likely similar to the well-studied SN Ia-CSM event PTF11kx, making it the second case in which an unambiguously classified SN Ia was observed to interact with a distant shell of CSM that contains hydrogen (RCSM & 1016 cm). The remainder of our HST NUV images of SNe Ia were nondetections that we use to constrain the occurrence rate of observable late-onset CSM interaction. We apply theoretical models for the emission from ejecta-CSM interaction to our NUV nondetections, and place upper limits on the mass and radial extent of CSM in SN Ia progenitor systems
0004-637X
Graham, M. L.
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Harris, C.E.
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Nugent, P. E.
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Maguire, K.
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Sullivan, M.
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Smith, M.
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Valenti, S.
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Goobar, A.
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Fox, O.D.
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Shen, Ken J.
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Kelly, P.L.
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McCully, C.
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Brink, Thomas G.
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Filippenko, A.V.
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Graham, M. L.
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Harris, C.E.
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Nugent, P. E.
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Maguire, K.
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Sullivan, M.
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Smith, M.
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Valenti, S.
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Goobar, A.
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Fox, O.D.
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Shen, Ken J.
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Kelly, P.L.
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McCully, C.
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Brink, Thomas G.
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Filippenko, A.V.
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Graham, M. L., Harris, C.E., Nugent, P. E., Maguire, K., Sullivan, M., Smith, M., Valenti, S., Goobar, A., Fox, O.D., Shen, Ken J., Kelly, P.L., McCully, C., Brink, Thomas G. and Filippenko, A.V. (2019) Delayed circumstellar interaction for Type Ia SN 2015cp revealed by an HST ultraviolet imaging survey. The Astrophysical Journal, 871. (doi:10.3847/1538-4357/aaf41e).

Record type: Article

Abstract

The nature and role of the binary companion of carbon-oxygen white dwarf stars that explode as Type Ia supernovae (SNe Ia) are not yet fully understood. Past detections of circumstellar material (CSM) that contain hydrogen for a small number of SN Ia progenitor systems suggest that at least some have a nondegenerate companion. In order to constrain the prevalence, location, and quantity of CSM in SN Ia systems, we performed a near-ultraviolet (NUV) survey with the Hubble Space Telescope (HST) to look for the high-energy signature of SN Ia ejecta interacting with CSM. Our survey revealed that SN 2015cp, a SN 1991T-like overluminous SN Ia, was experiencing late-onset interaction between its ejecta and surrounding CSM at 664 days after its light-curve peak. We present ground- and spacebased follow-up observations of SN 2015cp that reveal optical emission lines of H and Ca, typical signatures of ejecta-CSM interaction. We show how SN 2015cp was likely similar to the well-studied SN Ia-CSM event PTF11kx, making it the second case in which an unambiguously classified SN Ia was observed to interact with a distant shell of CSM that contains hydrogen (RCSM & 1016 cm). The remainder of our HST NUV images of SNe Ia were nondetections that we use to constrain the occurrence rate of observable late-onset CSM interaction. We apply theoretical models for the emission from ejecta-CSM interaction to our NUV nondetections, and place upper limits on the mass and radial extent of CSM in SN Ia progenitor systems

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Delayed Circumstellar Interaction for Type Ia SN 2015cp Revealed by an HST Ultraviolet Imaging Survey - Accepted Manuscript
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Accepted/In Press date: 25 November 2018
Published date: 22 January 2019

Identifiers

Local EPrints ID: 428442
URI: https://eprints.soton.ac.uk/id/eprint/428442
ISSN: 0004-637X
PURE UUID: 11caba83-b369-4a8e-a947-0710c03a0aa7
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432

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Date deposited: 27 Feb 2019 17:30
Last modified: 17 May 2019 00:30

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Contributors

Author: M. L. Graham
Author: C.E. Harris
Author: P. E. Nugent
Author: K. Maguire
Author: M. Sullivan ORCID iD
Author: M. Smith ORCID iD
Author: S. Valenti
Author: A. Goobar
Author: O.D. Fox
Author: Ken J. Shen
Author: P.L. Kelly
Author: C. McCully
Author: Thomas G. Brink
Author: A.V. Filippenko

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