Discarding orbital decay in WASP-19b after one decade of transit observations

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F20%3A00533032" target="_blank" >RIV/68378271:_____/20:00533032 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1093/mnras/stz3034" target="_blank" >https://doi.org/10.1093/mnras/stz3034</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stz3034" target="_blank" >10.1093/mnras/stz3034</a>

Result language
angličtina
Original language name
Discarding orbital decay in WASP-19b after one decade of transit observations
Original language description
We present a empirical study of orbital decay for the exoplanet WASP-19b, based on mid-time measurements of 74 complete transits (12 newly obtained by our team and 62 from the literature), covering a 10-year baseline. A linear ephemeris best represents the mid-transit times as a function of epoch. Thus, we detect no evidence of the shortening of WASP-19b's orbital period and establish an upper limit of its steady changing rate, dot{P}=-2.294 ms yr-1, and a lower limit for the modified tidal quality factor Q^' }_{star } = (1.23 ± 0.231) × 106. Both are in agreement with previous works. Finally, we measure the empirical Q^' }_{star } values of 15 exoplanet host stars which suggest that stars with Teff ≲ 5600K dissipate tidal energy more efficiently than hotter stars. This tentative trend needs to be confirmed with a larger sample of empirically measured Q^' }_{star }
Czech name
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Czech description
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Type
J<sub>imp</sub> - 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
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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