An extrasolar planetary system with three Neptune-mass planets

被引：298

作者：

Lovis, C

Mayor, M

Pepe, F

Alibert, Y

Benz, W

Bouchy, F

Correia, ACM

Laskar, J

Mordasini, C

Queloz, D

Santos, NC

Udry, S

Bertaux, JL

Sivan, JP

机构：

[1] Observ Geneva, CH-1290 Sauverny, Switzerland

[2] Univ Bern, Inst Phys, CH-3012 Bern, Switzerland

[3] Observ Haute Provence, F-04870 St Michel lObservatoire, France

[4] Inst Astrophys, F-75014 Paris, France

[5] Univ Aveiro, Dept Fis, P-3810193 Aveiro, Portugal

[6] IMCCE, CNRS, UMR 8028, F-75014 Paris, France

[7] Univ Lisbon, Ctr Astron & Astrofis, Observ Astron Lisboa, P-1349018 Lisbon, Portugal

[8] Colegio Luis Verney, Ctr Geofis Evora, P-7002554 Evora, Portugal

[9] CNRS, Serv Aeron, F-91371 Verrieres Le Buisson, France

[10] Lab Astrophys Marseille, F-13013 Marseille, France

来源：

NATURE | 2006年 / 441卷 / 7091期

关键词：

D O I：

10.1038/nature04828

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：

Over the past two years, the search for low-mass extrasolar planets has led to the detection of seven so-called 'hot Neptunes' or 'super-Earths' around Sun-like stars. These planets have masses 5 - 20 times larger than the Earth and are mainly found on close-in orbits with periods of 2 - 15 days. Here we report a system of three Neptune-mass planets with periods of 8.67, 31.6 and 197 days, orbiting the nearby star HD 69830. This star was already known to show an infrared excess possibly caused by an asteroid belt within 1 AU ( the Sun - Earth distance). Simulations show that the system is in a dynamically stable configuration. Theoretical calculations favour a mainly rocky composition for both inner planets, while the outer planet probably has a significant gaseous envelope surrounding its rocky/icy core; the outer planet orbits within the habitable zone of this star.

引用

页码：305 / 309

页数：5

共 30 条

[1] New Jupiter and Saturn formation models meet observations [J].