The University of Southampton
University of Southampton Institutional Repository

Slow-speed supernovae from the Palomar Transient Factory: two channels

Slow-speed supernovae from the Palomar Transient Factory: two channels
Slow-speed supernovae from the Palomar Transient Factory: two channels
Since the discovery of the unusual prototype SN 2002cx, the eponymous class of Type I (hydrogen-poor) supernovae with low ejecta speeds has grown to include approximately two dozen members identified from several heterogeneous surveys, in some cases ambiguously. Here we present the results of a systematic study of 1077 Type I supernovae discovered by the Palomar Transient Factory, leading to nine new members of this peculiar class. Moreover, we find there are two distinct subclasses based on their spectroscopic, photometric, and host galaxy properties: "SN 2002cx-like" supernovae tend to be in later-type or more irregular hosts, have more varied and generally dimmer luminosities, have longer rise times, and lack a Ti II trough when compared to "SN 2002es-like" supernovae. None of our objects show helium, and we counter a previous claim of two such events. We also find that the occurrence rate of these transients relative to Type Ia supernovae is 5.6-3.8+22 % (90% confidence), lower compared to earlier estimates. Combining our objects with the literature sample, we propose that these subclasses have two distinct physical origins.
1538-4357
1-21
White, Christopher J.
79dc7e95-a4e6-4063-9c5d-6803690d3dd7
Kasliwal, Mansi M.
b6c5b585-867a-49a8-81cd-aa992b48d078
Nugent, Peter E.
f98e37c2-aa8f-455b-8eb9-5b350046a2e0
Gal-Yam, Avishay
80aa0bba-7626-4e69-bb9b-8db7bf0cc159
Howell, D. Andrew
cc82c2ee-0721-4ecc-ad96-a0dca4deafea
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Goobar, Ariel
5e3924cf-a18d-4905-82be-f9388bf19cc6
Piro, Anthony L.
5e3ffdd8-396f-46c4-9d36-347ab868b6b6
Bloom, Joshua S.
d2ab3b02-56c4-4d5c-a792-badec0f13391
Kulkarni, Shrinivas R.
64b01016-7934-47db-8d4c-40646ebff394
Laher, Russ R.
b7795b2b-5748-430c-a8f4-7b5d46656597
Masci, Frank
b8b81d3c-f289-4da2-a2eb-2a6dea07fb20
Ofek, Eran O.
fd29f2ea-46bf-4629-b4c0-d264b6bd481c
Surace, Jason
5ed4d52a-2b90-4b0f-ba42-13045011a993
Ben-Ami, Sagi
653abcad-702d-4f59-9ba7-01864b5765e5
Cao, Yi
2595c336-1747-49de-ac6f-d717828ff6e9
Cenko, S. Bradley
e7a32a77-161f-4df3-8563-1b3fd474410b
Hook, Isobel M.
04fa422c-dcb3-408d-ad5b-fa5d6742cfc2
Jönsson, Jakob
64dc9521-1ddd-47cd-85b4-e7802c3c182c
Matheson, Thomas
920511a9-817c-4162-9104-c83a84a5a9a4
Sternberg, Assaf
fb81cff0-3691-4edb-95fa-f2c1859fe3c8
Quimby, Robert M.
e7dab437-ae0e-467a-8cad-99d6359e4ecf
Yaron, Ofer
bba3cfb6-03cd-4709-95db-a8a230f07d6a
White, Christopher J.
79dc7e95-a4e6-4063-9c5d-6803690d3dd7
Kasliwal, Mansi M.
b6c5b585-867a-49a8-81cd-aa992b48d078
Nugent, Peter E.
f98e37c2-aa8f-455b-8eb9-5b350046a2e0
Gal-Yam, Avishay
80aa0bba-7626-4e69-bb9b-8db7bf0cc159
Howell, D. Andrew
cc82c2ee-0721-4ecc-ad96-a0dca4deafea
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Goobar, Ariel
5e3924cf-a18d-4905-82be-f9388bf19cc6
Piro, Anthony L.
5e3ffdd8-396f-46c4-9d36-347ab868b6b6
Bloom, Joshua S.
d2ab3b02-56c4-4d5c-a792-badec0f13391
Kulkarni, Shrinivas R.
64b01016-7934-47db-8d4c-40646ebff394
Laher, Russ R.
b7795b2b-5748-430c-a8f4-7b5d46656597
Masci, Frank
b8b81d3c-f289-4da2-a2eb-2a6dea07fb20
Ofek, Eran O.
fd29f2ea-46bf-4629-b4c0-d264b6bd481c
Surace, Jason
5ed4d52a-2b90-4b0f-ba42-13045011a993
Ben-Ami, Sagi
653abcad-702d-4f59-9ba7-01864b5765e5
Cao, Yi
2595c336-1747-49de-ac6f-d717828ff6e9
Cenko, S. Bradley
e7a32a77-161f-4df3-8563-1b3fd474410b
Hook, Isobel M.
04fa422c-dcb3-408d-ad5b-fa5d6742cfc2
Jönsson, Jakob
64dc9521-1ddd-47cd-85b4-e7802c3c182c
Matheson, Thomas
920511a9-817c-4162-9104-c83a84a5a9a4
Sternberg, Assaf
fb81cff0-3691-4edb-95fa-f2c1859fe3c8
Quimby, Robert M.
e7dab437-ae0e-467a-8cad-99d6359e4ecf
Yaron, Ofer
bba3cfb6-03cd-4709-95db-a8a230f07d6a

White, Christopher J., Kasliwal, Mansi M., Nugent, Peter E., Gal-Yam, Avishay, Howell, D. Andrew, Sullivan, Mark, Goobar, Ariel, Piro, Anthony L., Bloom, Joshua S., Kulkarni, Shrinivas R., Laher, Russ R., Masci, Frank, Ofek, Eran O., Surace, Jason, Ben-Ami, Sagi, Cao, Yi, Cenko, S. Bradley, Hook, Isobel M., Jönsson, Jakob, Matheson, Thomas, Sternberg, Assaf, Quimby, Robert M. and Yaron, Ofer (2015) Slow-speed supernovae from the Palomar Transient Factory: two channels. The Astrophysical Journal, 799 (52), 1-21. (doi:10.1088/0004-637X/799/1/52).

Record type: Article

Abstract

Since the discovery of the unusual prototype SN 2002cx, the eponymous class of Type I (hydrogen-poor) supernovae with low ejecta speeds has grown to include approximately two dozen members identified from several heterogeneous surveys, in some cases ambiguously. Here we present the results of a systematic study of 1077 Type I supernovae discovered by the Palomar Transient Factory, leading to nine new members of this peculiar class. Moreover, we find there are two distinct subclasses based on their spectroscopic, photometric, and host galaxy properties: "SN 2002cx-like" supernovae tend to be in later-type or more irregular hosts, have more varied and generally dimmer luminosities, have longer rise times, and lack a Ti II trough when compared to "SN 2002es-like" supernovae. None of our objects show helium, and we counter a previous claim of two such events. We also find that the occurrence rate of these transients relative to Type Ia supernovae is 5.6-3.8+22 % (90% confidence), lower compared to earlier estimates. Combining our objects with the literature sample, we propose that these subclasses have two distinct physical origins.

Text
1405.7409v1.pdf - Accepted Manuscript
Download (2MB)

More information

Accepted/In Press date: 6 November 2014
Published date: 15 January 2015
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 394588
URI: http://eprints.soton.ac.uk/id/eprint/394588
ISSN: 1538-4357
PURE UUID: 0af10a02-d896-4a46-ad58-b2ff5dfc8aef
ORCID for Mark Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

Catalogue record

Date deposited: 20 May 2016 14:26
Last modified: 15 Mar 2024 03:44

Export record

Altmetrics

Contributors

Author: Christopher J. White
Author: Mansi M. Kasliwal
Author: Peter E. Nugent
Author: Avishay Gal-Yam
Author: D. Andrew Howell
Author: Mark Sullivan ORCID iD
Author: Ariel Goobar
Author: Anthony L. Piro
Author: Joshua S. Bloom
Author: Shrinivas R. Kulkarni
Author: Russ R. Laher
Author: Frank Masci
Author: Eran O. Ofek
Author: Jason Surace
Author: Sagi Ben-Ami
Author: Yi Cao
Author: S. Bradley Cenko
Author: Isobel M. Hook
Author: Jakob Jönsson
Author: Thomas Matheson
Author: Assaf Sternberg
Author: Robert M. Quimby
Author: Ofer Yaron

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×