Stellar activity masquerading as planets in the habitable zone of the M dwarf Gliese 581

被引：0
|
作者：
Robertson, Paul [1 ,2 ]
Mahadevan, Suvrath [1 ,2 ,3 ]
Endl, Michael [4 ]
Roy, Arpita [1 ,2 ,3 ]
机构：
[1] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA
[2] Penn State Univ, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 USA
[3] Penn State Univ, Penn State Astrobiol Res Ctr, University Pk, PA 16802 USA
[4] Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA
来源：
SCIENCE | 2014年 / 345卷 / 6195期
基金：
美国国家科学基金会;
关键词：
RADIAL-VELOCITY VARIABILITY; LOW-MASS STARS; M-CIRCLE-PLUS; HARPS SEARCH; EXOPLANET;
D O I：
10.1126/science.1253253
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
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.
引用
收藏
页码：440 / 444
页数：5
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