Sibel Örtel

Common Age and Initial Metallicity for the 16 Cyg Binary System

Asya Demirkol, Mutlu Yıldız, Sibel Örtel, Tuğbanur Çakır

Solar-like oscillating binary systems provide powerful constraints on stellar evolution, as their components are expected to share the same initial chemical composition and age due to their common origin. Asteroseismology further allows these parameters to be determined with high precision. The 16 …

us, au, tr (code pays fourni par la source)

New scaling relations from MESA models for mass and radius of subgiant stars: application to Kepler targets

T Çakçr Alsaç, M Yildiz, Sibel Örtel

ABSTRACT The precise determination of the fundamental parameters of stars is crucial for understanding stellar structure and evolution. In this regard, the asteroseismic parameters of solar-like oscillating stars obtained from space telescopes are very useful for determining the mass (M) and radius …

au (code pays fourni par la source)

The role of asteroseismology in understanding mass-loss in red giants

Sibel Örtel, Mutlu Yıldız

ABSTRACT Red giant stars play a key role in advancing our understanding of stellar mass-loss. However, its initial mass and the amount of mass lost during this phase remain uncertain. In this study, we investigate the asteroseismic signatures of mass-loss and the …

au (code pays fourni par la source)

The Role of Asteroseismology in Understanding Mass Loss in Red Giants

Sibel Örtel, Mutlu Yıldız

Red giant stars play a key role in advancing our understanding of stellar mass loss. However, its initial mass and the amount of mass lost during this phase remain uncertain. In this study, we investigate the asteroseismic signatures of mass loss and …

Gaz Gezegenlerin Yapısı ve Kimyasal Bileşimi Üzerine

Mutlu Yıldız, Sibel Örtel, Zeynep Çelik Orhan, Tuğbanur Çakır

Gezegenlerin iç yapısını araştırırken neredeyse tek kısıtlama gezegenin yarıçapıdır. Gaz devleri basitçe belirli bir kütleye ulaşan metal bir özeğe ve bu özeği çevreleyen bir gaz zarfa sahiptir. Yarıçapı etkileyen ancak belirsiz olan ana nicelikler, metal özeğin kütlesi, yoğunluğu ve zarfın kimyasal bileşimidir. …

tr, nl (code pays fourni par la source)

Is there a unique asteroseismic interior model for the solar-like oscillating KIC 7747078?

Sibel Örtel, Mutlu Yıldız, Zeynep Çelik Orhan

ABSTRACT Asteroseismology provides a direct observational window into the structure and evolution of stars. While spectroscopic and photometric methods only offer information about the surface properties of stars, asteroseismology, through oscillation frequencies, provides comprehensive information about the deep stellar interior as well …

tr, au (code pays fourni par la source)

The Gasing Pangkah Collaboration. I. Asteroseismic Identification and Characterization of a Rapidly Rotating Engulfment Candidate*

J. M. Joel Ong, Marc Hon, Melinda Soares-Furtado, Alexander P. Stephan et autres

Abstract We report the discovery and characterization of TIC 350842552 (“Zvrk”), an apparently isolated, rapidly rotating ( P rot ∼ 99 days) red giant observed by TESS in its southern Continuous Viewing Zone. The star’s fast surface rotation is independently verified by …

au (code pays fourni par la source)

The Gasing Pangkah Collaboration: I. Asteroseismic Identification and Characterisation of a Rapidly-Rotating Engulfment Candidate

J. M. Joel Ong, Marc Hon, Melinda Soares-Furtado, Alexander P. Stephan et autres

We report the discovery and characterisation of TIC 350842552 ("Zvrk"), an apparently isolated, rapidly-rotating ($P_\text{rot} \sim 99\ \mathrm{d}$) red giant observed by TESS in its Southern Continuous Viewing Zone. The star's fast surface rotation is independently verified by the use of p-mode …

Structure and composition of Jupiter, Saturn, Uranus, and Neptune under different constraints and distortion due to rotation

Mutlu Yıldız, Sibel Örtel, Tuğbanur Çakır

ABSTRACT The radii of planets serve as significant constraints for their internal structure. Despite the complexity of planetary internal structure compared to stars, substantial advancements have been made in this field. The most critical uncertainties stem from the chemical composition and equation …

tr (code pays fourni par la source)

Analysing mixed modes of the four solar-like oscillating subgiant stars

Mutlu Yıldız, Sibel Örtel

ABSTRACT The observation of an unprecedented number of solar-like oscillating subgiant (SG) stars by the Kepler and TESS missions is crucial for the asteroseismic characterization of these stars, stellar population studies, and the study of stellar evolution theories. Owing to these missions, …

tr (code pays fourni par la source)

A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS

Jonathan Gagné, J.-D. do Nascimento, Andrés Jordán, A. Mazumdar et autres

We present the discovery of HD 221416 b, the first transiting planet identified by the Transiting Exoplanet Survey Satellite (TESS) for which asteroseismology of the host star is possible. HD 221416 b (HIP 116158, TOI-197) is a bright (V = 8.2 mag), …

A close-in giant planet escapes engulfment by its star

Marc Hon, Daniel Huber, Nicholas Z. Rui, Jim Fuller et autres

When main-sequence stars expand into red giants, they are expected to engulf close-in planets1–5. Until now, the absence of planets with short orbital periods around post-expansion, core-helium-burning red giants6–8 has been interpreted as evidence that short-period planets around Sun-like stars do not …

us, au, gb, dk, de, se, it, tr, pt (code pays fourni par la source)