تقرير
A Close-in Planet Orbiting Giant Star HD 167768
| العنوان: | A Close-in Planet Orbiting Giant Star HD 167768 |
|---|---|
| المؤلفون: | Teng, Huan-Yu, Sato, Bun'ei, Kunitomo, Masanobu, Takarada, Takuya, Omiya, Masashi, Harakawa, Hiroki, Xiao, Guang-Yao, Liu, Yu-Juan, Izumiura, Hideyuki, Kambe, Eiji, Yoshida, Michitoshi, Itoh, Yoichi, Ando, Hiroyasu, Kokubo, Eiichiro, Shigeru, Ida |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | We report the detection of a giant planet orbiting a G-type giant star HD 167768 from radial velocity measurements using HIgh Dispersion Echelle Spectrograph (HIDES) at Okayama Astrophysical Observatory (OAO). HD 167768 has a mass of $1.08_{-0.12}^{+0.14} M_{\odot}$, a radius of $9.70_{-0.25}^{+0.25} R_{\odot}$, a metallicity of $\rm{[Fe/H]}=-0.67_{-0.08}^{+0.09}$, and a surface gravity of $\log g = 2.50_{-0.06}^{+0.06}$. The planet orbiting the star is a warm Jupiter, having a period of $20.6532_{-0.0032}^{+0.0032}\ \rm{d}$, a minimum mass of $0.85_{-0.11}^{+0.12}\ M_{\rm{J}}$, and an orbital semimajor axis of $0.1512_{-0.0063}^{+0.0058}\ \rm{au}$. The planet has one of the shortest orbital periods among those ever found around deeply evolved stars ($\log g < 3.5$) using radial velocity methods. The equilibrium temperature of the planet is $1874\ \rm{K}$, as high as a hot Jupiter. The radial velocities show two additional regular variations at $41\ \rm{d}$ and $95\ \rm{d}$, suggesting the possibility of outer companions in the system. Follow-up monitoring will enable validation of the periodicity. We also calculated the orbital evolution of HD 167768 b and found that the planet will be engulfed within 0.15\,Gyr. Comment: Accepted by Publications of the Astronomical Society of Japan, 9 pages, 7 figures, 2 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/pasj/psac097 |
| URL الوصول: | http://arxiv.org/abs/2211.06576 |
| رقم الأكسشن: | edsarx.2211.06576 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/pasj/psac097 |
|---|