TOI-2458 b: A mini-Neptune consistent with in situ hot Jupiter formation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00617428" target="_blank" >RIV/67985815:_____/25:00617428 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0365971" target="_blank" >https://hdl.handle.net/11104/0365971</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202451057" target="_blank" >10.1051/0004-6361/202451057</a>

Jazyk výsledku

angličtina

Název v původním jazyce

TOI-2458 b: A mini-Neptune consistent with in situ hot Jupiter formation

Popis výsledku v původním jazyce

We report on the discovery and spectroscopic confirmation of TOI-2458 b, a transiting mini-Neptune around an F-type star leaving the main-sequence with a mass of M-star = 1.05 +/- 0.03 M-circle dot, a radius of R-star = 1.31 +/- 0.03 R-circle dot, an effective temperature of T-eff = 6005 +/- 50 K, and a metallicity of0.10 +/- 0.05 dex. By combining TESS photometry with high-resolution spectra acquired with the HARPS spectrograph, we found that the transiting planet has an orbital period of3.74 days, a mass of M-p = 13.31 +/- 0.99 M-circle plus and a radius of R-p = 2.83 +/- 0.20 R-circle plus. The host star TOI-2458 shows a short activity cycle of similar to 54 days revealed in the HARPS S-index and Ha times series. We took the opportunity to investigate other F stars showing activity cycle periods comparable to that of TOI-2458 and found that they have shorter rotation periods than would be expected based on the gyrochronology predictions. In addition, we determined TOI-2458's stellar inclination angle to be i(*) = 10.6(-10.6)(+13.3) degrees. We discuss that both phenomena (fast stellar rotation and planet orbit inclination) could be explained by in situ formation of a hot Jupiter interior to TOI-2458 b. It is plausible that this hot Jupiter was recently engulfed by the star. Analysis of HARPS spectra has identified the presence of another planet with a period of P = 16.55 +/- 0.06 days and a minimum mass of M-p sin i = 10.22 +/- 1.90 M-circle plus. Using dynamical stability analysis, we constrained the mass of this planet to the range M-c similar or equal to (10, 25) M-circle plus.

Název v anglickém jazyce

TOI-2458 b: A mini-Neptune consistent with in situ hot Jupiter formation

Popis výsledku anglicky

We report on the discovery and spectroscopic confirmation of TOI-2458 b, a transiting mini-Neptune around an F-type star leaving the main-sequence with a mass of M-star = 1.05 +/- 0.03 M-circle dot, a radius of R-star = 1.31 +/- 0.03 R-circle dot, an effective temperature of T-eff = 6005 +/- 50 K, and a metallicity of0.10 +/- 0.05 dex. By combining TESS photometry with high-resolution spectra acquired with the HARPS spectrograph, we found that the transiting planet has an orbital period of3.74 days, a mass of M-p = 13.31 +/- 0.99 M-circle plus and a radius of R-p = 2.83 +/- 0.20 R-circle plus. The host star TOI-2458 shows a short activity cycle of similar to 54 days revealed in the HARPS S-index and Ha times series. We took the opportunity to investigate other F stars showing activity cycle periods comparable to that of TOI-2458 and found that they have shorter rotation periods than would be expected based on the gyrochronology predictions. In addition, we determined TOI-2458's stellar inclination angle to be i(*) = 10.6(-10.6)(+13.3) degrees. We discuss that both phenomena (fast stellar rotation and planet orbit inclination) could be explained by in situ formation of a hot Jupiter interior to TOI-2458 b. It is plausible that this hot Jupiter was recently engulfed by the star. Analysis of HARPS spectra has identified the presence of another planet with a period of P = 16.55 +/- 0.06 days and a minimum mass of M-p sin i = 10.22 +/- 1.90 M-circle plus. Using dynamical stability analysis, we constrained the mass of this planet to the range M-c similar or equal to (10, 25) M-circle plus.

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

693

Číslo periodika v rámci svazku

Jan.

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

19

Strana od-do

A235

Kód UT WoS článku

001404890500009

EID výsledku v databázi Scopus

2-s2.0-85216404674