English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Despite their cosmological utility, the progenitors of Type Ia supernovae(SNe Ia) are still unknown, with many efforts focused on whether accretion froma nondegenerate companion can grow a carbon-oxygen white dwarf to near theChandrasekhar mass. The association of SNe Ia resembling SN 1991T ("91T-like")with circumstellar interaction may be evidence for this "single-degenerate"channel. However, the observed circumstellar medium (CSM) in these interactingsystems is unlike a stellar wind -- of particular interest, it is sometimesdetached from the stellar surface, residing at $\sim 10^{16}~{\rm cm}$. AHubble Space Telescope (HST) program to discover detached CSM around 91T-likeSNe Ia successfully discovered interaction nearly two years after explosion inSN 2015cp (Graham et al., 2018). In this work, we present radio and X-rayfollow-up observations of SN 2015cp and analyze them in the framework ofHarris, Nugent, & Kasen (2016) to limit the properties of a constant-densityCSM shell in this system. Assuming the HST detection was shortly after theshock crossed the CSM, we constrain the total CSM mass in this system to be $<0.5~{\rm M_\odot}$. This limit is comparable to the CSM mass of supernovaPTF11kx, but does not rule out lower masses predicted for recurrent novae. Fromlessons learned modeling PTF11kx and SN 2015cp, we suggest a strategy forfuture observations of these events to increase the sample of known interactingSNe Ia.

Don't Blink: Constraining the Circumstellar Environment of the Interacting Type Ia Supernova 2015cp