研究目的
To investigate the existence of an outer companion to the star KELT-6, which hosts the transiting hot-Saturn KELT-6 b, and to study the orbital characteristics of the KELT-6 system.
研究成果
The study confirms the existence of an outer planet, KELT-6 c, with a minimum mass of 3.71 ± 0.21 MJup and a moderately eccentric orbit. The Rossiter-McLaughlin effect measurement indicates a prograde, slightly misaligned orbit for KELT-6 b. The KELT-6 system provides a valuable case for studying multi-planet system formation and evolution.
研究不足
The study is limited by the precision of radial velocity measurements and the ability to distinguish between Keplerian signals and stellar activity. The lack of enough RV data in the pre-transit phase affects the certainty of the spin-orbit angle measurement.
1：Experimental Design and Method Selection:
Spectroscopic monitoring of KELT-6 using HARPS-N and TRES spectrographs to detect radial velocity variations indicative of an outer companion. Observation of a spectroscopic transit of KELT-6 b with HARPS-N and simultaneous photometry with the IAC-80 telescope.
2：Sample Selection and Data Sources:
KELT-6, a late F-type, metal-poor star known to host the transiting planet KELT-6 b.
3：List of Experimental Equipment and Materials:
HARPS-N spectrograph (R = 115,000), TRES spectrograph (R = 44,000), IAC-80 telescope with CAMELOT camera.
4：Experimental Procedures and Operational Workflow:
Collection of 93 new spectra, reduction and analysis of spectra and radial velocity measurements, photometric measurements during transit.
5：Data Analysis Methods:
Bayesian differential evolution Markov chain Monte Carlo analysis for orbital parameters, numerical model for Rossiter-McLaughlin effect.
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