Stellar obliquities of eight close-in gas giant exoplanets

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216224:14310/25:00141401

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Stellar obliquities of eight close-in gas giant exoplanets

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Stellar obliquities of eight close-in gas giant exoplanets

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

694

Číslo periodika v rámci svazku

Feb.

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

13

Strana od-do

A91

Kód UT WoS článku

001414735800016

EID výsledku v databázi Scopus

2-s2.0-85217871028