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 0.010 R. 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. 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. © 2011. The American Astronomical Society. All rights reserved.
Publication Source (Journal or Book title)
Astrophysical Journal Letters
Von Braun, K., Boyajian, T., Kane, S., Van Belle, G., Ciardi, D., López-Morales, M., McAlister, H., Henry, T., Jao, W., Riedel, A., Subasavage, J., Schaefer, G., Ten Brummelaar, T., Ridgway, S., Sturmann, L., Sturmann, J., Mazingue, J., Turner, N., Farrington, C., Goldfinger, P., & Boden, A. (2011). Astrophysical parameters and habitable zone of the exoplanet hosting star GJ 581. Astrophysical Journal Letters, 729 (2 PART II) https://doi.org/10.1088/2041-8205/729/2/L26