ASTROPHYSICAL PARAMETERS AND HABITABLE ZONE OF THE EXOPLANET HOSTING STAR GJ 581

作者：von Braun Kaspar^*; Boyajian Tabetha S; Kane Stephen R; van Belle Gerard T; Ciardi David R; Lopez Morales Mercedes; McAlister Harold A; Henry Todd J; Jao Wei Chun; Riedel Adric R; Subasavage John P; Schaefer Gail; ten Brummelaar Theo A; Ridgway Stephen; Sturmann Laszlo; Sturmann Judit; Mazingue Jude; Turner Nils H; Farrington Chris; Goldfinger P J; Boden Andrew F

来源：Astrophysical Journal Letters, 2011, 729(2): L26.

DOI：10.1088/2041-8205/729/2/L26

• infrared: stars
• planetary systems
• stars: fundamental parameters
• stars: individual (GJ 581)
• stars: late-type
• techniques: interferometric

GJ 581 is an M dwarf host of a multiplanet system. We use long-baseline interferometric measurements from the CHARA Array, coupled with trigonometric parallax information, to directly determine its physical radius to be 0.299 +/- 0.010R(circle dot). Literature photometry data are used to perform spectral energy distribution fitting in order to determine GJ 581's effective surface temperature T-EFF = 3498 +/- 56 K and its luminosity L = 0.01205 +/- 0.00024 L-circle dot. From these measurements, we recompute the location and extent of the system's habitable zone and conclude that two of the planets orbiting GJ 581, planets d and g, spend all or part of their orbit within or just on the edge of the habitable zone.

• 出版日期2011-3-10