期刊
SCIENCE
卷 345, 期 6195, 页码 440-444出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1253253
关键词
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资金
- NSF [AST-1006676, AST-1126413, AST-1310885, AST-1313075]
- 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
- NASA through the Origins of Solar Systems Program [NNX09AB30G]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1006676] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1126413, 1313075] Funding Source: National Science Foundation
The M dwarf star Gliese 581 is believed to host four planets, including one (GJ 581d) near the habitable zone that could possibly support liquid water on its surface if it is a rocky planet. The detection of another habitable-zone planet-GJ 581g-is disputed, as its significance depends on the eccentricity assumed for d. Analyzing stellar activity using the Ha line, we measure a stellar rotation period of 130 +/- 2 days and a correlation for H alpha modulation with radial velocity. Correcting for activity greatly diminishes the signal of GJ 581d (to 1.5 standard deviations) while significantly boosting the signals of the other known super-Earth planets. GJ 581d does not exist, but is an artifact of stellar activity which, when incompletely corrected, causes the false detection of planet g.
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