High-resolution Transmission Spectroscopy of Four Hot Inflated Gas Giant Exoplanets

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00111907" target="_blank" >RIV/00216224:14310/19:00111907 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.3847/1538-3881/ab32ec" target="_blank" >https://iopscience.iop.org/article/10.3847/1538-3881/ab32ec</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-3881/ab32ec" target="_blank" >10.3847/1538-3881/ab32ec</a>

Result language

angličtina

Original language name

High-resolution Transmission Spectroscopy of Four Hot Inflated Gas Giant Exoplanets

Original language description

The technique of transmission spectroscopy allows us to constrain the chemical composition of the atmospheres of transiting exoplanets. It relies on very high signal-to-noise spectroscopic (or spectrophotometric) observations and is thus most suited for bright exoplanet host stars. In the era of the Transiting Exoplanet Survey Satellite, Next Generation Space Telescope, and PLAnetary Transits and Oscillations of stars (PLATO), more and more suitable targets, even for mid-sized telescopes, are discovered. Furthermore, a wealth of archival data is available that could become a basis for long-term monitoring of exo-atmospheres. We analyzed archival High Accuracy Radial velocity Planet Searcher (HARPS) spectroscopic time series of four host stars to transiting bloated gas exoplanets, namely WASP-76b, WASP-127b, WASP-166b, and KELT-11b, searching for traces of sodium (sodium doublet), hydrogen (H alpha, H beta), and lithium (670.8 nm). The archival data sets include spectroscopic time series taken during transits. Comparing in- and out-of-transit spectra we can filter out the stellar lines and investigate the absorption from the planet. Simultaneously, the stellar activity is monitored using the Mg I and Ca I lines. We detect sodium in the atmosphere of WASP-76b at a 7-9 sigma level. Furthermore, we report also at a 4-8 sigma level of significance the detection of sodium in the atmosphere of WASP-127b, confirming earlier results based on low-resolution spectroscopy. The data show no sodium nor any other atom at high confidence levels for WASP-166b nor KELT-11b, hinting at the presence of thick high clouds.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/EF16_027%2F0008360" target="_blank" >EF16_027/0008360: Postdoc@MUNI</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomical Journal

ISSN

0004-6256

e-ISSN

1538-3881

Volume of the periodical

158

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

8

Pages from-to

1-8

UT code for WoS article

000482574300001

EID of the result in the Scopus database

2-s2.0-85072370952