ASTROPHYSICAL PARAMETERS AND HABITABLE ZONE OF THE EXOPLANET HOSTING STAR GJ 581
- NASA Exoplanet Science Institute, California Institute of Technology, MC 100-22, Pasadena, CA 91125 (United States)
- Center for High Angular Resolution Astronomy and Department of Physics and Astronomy, Georgia State University, P.O. Box 4106, Atlanta, GA 30302-4106 (United States)
- European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching (Germany)
- Institut de Ciencies de L'Espai (CSIC-IEEC), Campus UAB, Facultat Ciencies, Torre C5 parell 2, 08193 Bellaterra, Barcelona (Spain)
- Cerro Tololo Inter-American Observatory, Casilla 603, La Serena (Chile)
- CHARA Array, Mount Wilson Observatory, Mount Wilson, CA 91023 (United States)
- National Optical Astronomy Observatory, P.O. Box 26732, Tucson, AZ 85726-6732 (United States)
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{sub sun}. Literature photometry data are used to perform spectral energy distribution fitting in order to determine GJ 581's effective surface temperature T{sub EFF} = 3498 {+-} 56 K and its luminosity L = 0.01205 {+-} 0.00024 L{sub sun}. 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.
- OSTI ID:
- 21560448
- Journal Information:
- Astrophysical Journal Letters, Vol. 729, Issue 2; Other Information: DOI: 10.1088/2041-8205/729/2/L26; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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