التفاصيل البيبلوغرافية
| العنوان: |
HD 28185 revisited: an outer planet, instead of a brown dwarf, on a Saturn-like orbit. |
| المؤلفون: |
Venner, Alexander1 (AUTHOR) alexandervenner@gmail.com, An, Qier2,3 (AUTHOR), Huang, Chelsea X1 (AUTHOR), Brandt, Timothy D2,4 (AUTHOR), Wittenmyer, Robert A1 (AUTHOR), Vanderburg, Andrew5 (AUTHOR) |
| المصدر: |
Monthly Notices of the Royal Astronomical Society. 11/30/2024, Vol. 535 Issue 1, p90-106. 17p. |
| مصطلحات موضوعية: |
*SOLAR system, *GAS giants, *NATURAL satellites, *OUTER planets, *BROWN dwarf stars, *INNER planets |
| مستخلص: |
As exoplanet surveys reach ever-higher sensitivities and durations, planets analogous to the Solar system giant planets are increasingly within reach. HD 28185 is a Sun-like star known to host a |$m\sin i=6~M_\mathrm{ J}$| planet on an Earth-like orbit; more recently, a brown dwarf with a more distant orbit has been claimed. In this work, we present a comprehensive re-analysis of the HD 28185 system, based on 22 yr of radial velocity (RV) observations and precision Hipparcos–Gaia astrometry. We confirm the previous characterization of HD 28185 b as a temperate giant planet, with its |$385.92^{+0.06}_{-0.07}$| d orbital period giving it an Earth-like incident flux. In contrast, we substantially revise the parameters of HD 28185 c; with a new mass of |$m=6.0\pm 0.6~M_\mathrm{ J}$| , we reclassify this companion as a super-Jovian planet. HD 28185 c has an orbital period of |$24.9^{+1.3}_{-1.1}$| yr, a semimajor axis of |$8.50^{+0.29}_{-0.26}$| au, and a modest eccentricity of |$0.15\pm 0.04$| , resulting in one of the most Saturn-like orbits of any known exoplanet. HD 28185 c lies at the current intersection of detection limits for RVs and direct imaging, and highlights how the discovery of giant planets at |$\approx$| 10 au separations is becoming increasingly routine. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |