Astrophysical Parameters and Habitable Zone of the Exoplanet Hosting Star GJ 581

Abstract

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 $0.299\pm 0.010R_{\odot }$. Literature photometry data are used to perform spectral energy distribution fitting in order to determine GJ 581's effective surface temperature $T_{\mathrm{EFF}}=3498\pm 56$ K and its luminosity $L=0.01205\pm 0.00024L_{\odot }$. 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.

10 pages, 3 figures, 2 tables; accepted for publication in ApJL

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