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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this paper we present ground-based high-resolution spectroscopy of 51Pegasi using CRIRES at the Very Large Telescope. The system was observed for3x5 hours at 2.3 {\mu}m at a spectral resolution of R = 100,000, targetingpotential signatures from carbon monoxide, water vapour and methane in theplanet's dayside spectrum. In the first 2x5 hours of data, we find a combinedsignal from carbon monoxide and water in absorption at a formal 5.9{\sigma}confidence level, indicating a non-inverted atmosphere. We derive a planet massof M_P = (0.46 +- 0.02) M_Jup and an orbital inclination i between 79.6 and82.2 degrees, with the upper limit set by the non-detection of the planettransit in previous photometric monitoring. However, there is no trace of thesignal in the final 5 hours of data. A statistical analysis indicates that thesignal from the first two nights is robust, but we find no compellingexplanation for its absence in the final night. The latter suffers fromstronger noise residuals and greater instrumental instability than the firsttwo nights, but these cannot fully account for the missing signal. It ispossible that the integrated dayside emission from 51 Peg b is instead stronglyaffected by weather. However, more data are required before we can claim anytime variability in the planet's atmosphere.

Detection of molecular absorption in the dayside of exoplanet 51 Pegasi b?