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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present a series of near-infrared spectra of Nova Ophiuchus 2017 in the$K$ band that record the evolution of the first overtone CO emission inunprecedented detail. Starting from 11.7d after maximum, when CO is firstdetected at great strength, the spectra track the CO emission to +25.6d bywhich time it is found to have rapidly declined in strength by almost a factorof $\sim$ 35. The cause for the rapid destruction of CO is examined in theframework of different mechanisms for CO destruction viz. an increase inphotoionizating flux, chemical pathways of destruction or destruction byenergetic non-thermal particles created in shocks. From LTE modelling of the COemission, the $^{12}$C/$^{13}$C ratio is determined to be 1.6 $\pm$ 0.3. Thisis consistent with the expected value of this parameter from nucleosynthesistheory for a nova eruption occuring on a low mass ($\sim$ 0.6 M$_\odot$)carbon-oxygen core white dwarf. The present $^{12}$C/$^{13}$C estimateconstitutes one of the most secure estimates of this ratio in a classical nova.

Nova Ophiuchus 2017 as a probe of $^{13}$C nucleosynthesis and carbon monoxide formation and destruction in classical novae