Astrophysical parameters and habitable zone of the exoplanet hosting star GJ 581

von Braun, Kaspar and Boyajian, Tabetha S. and Kane, Stephen R. and van Belle, Gerard T. and Ciardi, David R. and Lopez-Morales, Mercedes and McAlister, Harold A. and Henry, Todd J. and Jao, Wei Chun and Riedel, Adric R. and Subasavage, John P. and Schaefer, Gail and ten Brummelaar, Theo A. and Ridgway, Stephen and Sturmann, Laszlo and Sturmann, Judit and Mazingue, Jude and Turner, Nils H. and Farrington, Chris and Goldfinger, P. J. and Boden, Andrew F. (2011) Astrophysical parameters and habitable zone of the exoplanet hosting star GJ 581. The Astrophysical Journal Letters, 729 (PART II). L26-L30. ISSN 2041-8205

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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 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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 23 Jun 2017 02:29
Last Modified: 08 Nov 2017 02:48
Uncontrolled Keywords: infrared stars; planetary systems; fundamental parameters; GJ 581; late-type stars; interferometry
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/2041-8205/729/2/L26
URI: http://eprints.usq.edu.au/id/eprint/32173

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