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

页码：440 / 444

页数：5

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