Stellar obliquities of eight close-in gas giant exoplanets
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00617100" target="_blank" >RIV/67985815:_____/25:00617100 - isvavai.cz</a>
Alternative codes found
RIV/00216224:14310/25:00141401
Result on the web
<a href="https://hdl.handle.net/11104/0365444" target="_blank" >https://hdl.handle.net/11104/0365444</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202452171" target="_blank" >10.1051/0004-6361/202452171</a>
Alternative languages
Result language
angličtina
Original language name
Stellar obliquities of eight close-in gas giant exoplanets
Original language description
The Rossiter-McLaughlin effect allows us to measure the projected stellar obliquity of exoplanets. From the spin-orbit alignment, planet formation and migration theories can be tested to improve our understanding of the currently observed exoplanetary population. Despite having the spin-orbit measurements for more than 200 planets, the stellar obliquity distribution is still not fully understood, warranting additional measurements to sample the full parameter space. We analyzed archival HARPS and HARPS-N spectroscopic transit time series of eight gas giant exoplanets on short orbits and derive their projected stellar obliquity lambda. We report a prograde, but misaligned orbit for HAT-P-50b (lambda=41 degrees(+10)(-9)), possibly hinting at previous high-eccentricity migration given the presence of a close stellar companion. We measure sky-projected obliquities that are consistent with aligned orbits for the rest of the planets: WASP-48b (lambda=-4 degrees +/- 4), WASP-59b (lambda=-1 degrees(+20)(-21)), WASP-140 Ab (lambda=-1 degrees +/- 3), WASP-173 Ab (lambda=9 degrees +/- 5), TOI-2046b (lambda=1 degrees +/- 6),HAT-P-41 Ab (lambda=-4 degrees(+5)(-6)), and Qatar-4b (lambda=-13 degrees+15-19). We measure the true stellar obliquity psi for four systems. We infer a prograde, but misaligned, orbit for TOI-2046b with psi=42(-8)(+10)deg. Additionally,psi=30(-15)(degrees+18)for WASP-140 Ab,psi=21 degrees(+9)(-10)for WASP-173 Ab,and psi=32 degrees(+14)(-13)for Qatar-4b. The aligned orbits are consistent with slow disk migration, ruling out violent events that would excite the orbits over the history of these systems. Finally, we provide a new age estimate for TOI-2046 of at least 700 Myr and for Qatar-4 of atleast 350-500 Myr, contradicting previous results.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
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
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
694
Issue of the periodical within the volume
Feb.
Country of publishing house
FR - FRANCE
Number of pages
13
Pages from-to
A91
UT code for WoS article
001414735800016
EID of the result in the Scopus database
2-s2.0-85217871028