期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 793, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/793/2/L24
关键词
planetary systems; stars: activity; stars: individual (GJ 667C); stars: late-type; techniques: radial velocities; techniques: spectroscopic
资金
- NSF [AST-1006676, AST-1126413, AST-1310885]
- Penn State Astrobiology Research Center
- NASA Astrobiology Institute [NNA09DA76A]
- Center for Exoplanets and Habitable Worlds
- Pennsylvania State University
- Eberly College of Science
- Pennsylvania Space Grant Consortium
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1126413] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1006676] Funding Source: National Science Foundation
Gliese 667C is an M1.5V star with a multi-planet system, including planet candidates in the habitable zone. The exact number of planets in the system is unclear, because the existing radial velocity (RV) measurements are known to contain contributions from stellar magnetic activity. Following our analysis of Gliese 581, we have analyzed the effect of stellar activity on the HARPS/HARPS-TERRA RVs of GJ 667C, finding a significant RV-activity correlation when using the width (FWHM) of the HARPS cross-correlation function to trace the magnetic activity. When we correct for this correlation, we confirm the detections of the previously observed planets b and c in the system, while simultaneously ascribing the RV signal near 90 days (planet d) to an artifact of the stellar rotation. We are unable to confirm the existence of the additional RV periodicities described in Anglada-Escude et al. in our activity-corrected data.
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