Casasayas Barris, N.

Kesseli, A.Y.

Landman, R.

Snellen, I.A.G.

Sánchez López, A.

Leiden University Scholary Publications

Spatial characterization of the trailing and leading limbs ofWASP-76b: detection of H2O and HCN at high-resolutionSánchez López, A.; Landman, R.; Casasayas Barris, N.; Kesseli, A.Y.; Snellen, I.A.G.CitationSánchez López, A., Landman, R., Casasayas Barris, N., Kesseli, A. Y., & Snellen, I. A. G.(2021). Spatial characterization of the trailing and leading limbs of WASP-76b: detection ofH2O and HCN at high-resolution. Epc Abstracts, EPSC2021-563.doi:10.5194/epsc2021-563 Version: Publisher's VersionLicense: Creative Commons CC BY 4.0 licenseDownloaded from: https://hdl.handle.net/1887/3273747 Note: To cite this publication please use the final published version (if applicable).EPSC AbstractsVol. 15, EPSC2021-563, 2021, updated on 20 Jan 2022https://doi.org/10.5194/epsc2021-563Europlanet Science Congress 2021© Author(s) 2022. This work is distributed underthe Creative Commons Attribution 4.0 License.Spatial characterization of the trailing and leading limbs ofWASP-76b: Detection of H2O and HCN at high-resolutionAlejandro Sánchez López, Rico Landman, Núria Casasayas Barris, Aurora Kesseli, and IgnasSnellenLeiden Observatory - Leiden UniversityExtreme temperature contrasts between the day and nightside of ultra-hot Jupiters (UHJ) result insignificantly asymmetric atmospheres, with a region of extreme atmospheric expansion appearingover a small range of latitudes around the terminator. Over the course of a transit, WASP-76 brotates by about 30° and hence temporal variations of the observable atmosphere could significantlyaffect the detectability of its constituents. Specifically, the trailing limb of this planet allows us toprobe a significant portion of the inflated dayside, resulting in a higher atmospheric detectability.This geometric effect could mimic the observed time-variability of absorption signals due tocondensation in the nightside of these planets, which has been recently reported for neutral iron inWASP-76 b. By studying molecules that are not expected to condense in the nightside of UHJs(~1000K), we can isolate the possible effect of different day and nightside scale heights. Here, wewill analyze a stronger water vapor signal during the egress of the planet than at ingress, whichcannot be explained by condensation and suggests that the extreme geometry of UHJ manifestsitself as time-dependent absorption signals. Additionally, we report a redshifted HCN signaturearising from the leading limb (i.e., observable in the first half of the transit and absent from thesecond half) and a weak evidence of ammonia using high-resolution observations of WASP-76 b withCARMENES.Powered by TCPDF (www.tcpdf.org)

Spatial characterization of the trailing and leading limbs of WASP-76b: detection of H2O and HCN at high-resolution

https://scholarlypublications.universiteitleiden.nl/access/item%3A3273748/download

Spatial characterization of the trailing and leading limbs of WASP-76b: detection of H2O and HCN at high-resolution

Abstract

Similar works

Full text

Available Versions

Leiden University Scholary Publications