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Record 1 of 54788
Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
External Online Source: doi:10.1088/2041-8205/787/2/L29
Author and Affiliation:
Kopparapu, Ravi Kumar(Pennsylvania State Univ., Dept. of Geosciences, University Park, PA, United States)
Ramirez, Ramses M.(Pennsylvania State Univ., Dept. of Geosciences, University Park, PA, United States)
Kotte, James Schottel(Pennsylvania State Univ., Dept. of Astronomy and Astrophysics, University Park, PA, United States)
Kasting, James F.(Pennsylvania State Univ., Dept. of Geosciences, University Park, PA, United States)
Domagal-Goldman, Shawn(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Eymet, Vincent(Bordeaux Univ., Laboratoire d’Astrophysique de Bordeaux, France)
Abstract: The ongoing discoveries of extra-solar planets are unveiling a wide range of terrestrial mass (size) planets around their host stars. In this Letter, we present estimates of habitable zones (HZs) around stars with stellar effective temperatures in the range 2600 K-7200 K, for planetary masses between 0.1M and 5M. Assuming H2O-(inner HZ) and CO2-(outer HZ) dominated atmospheres, and scaling the background N2 atmospheric pressure with the radius of the planet, our results indicate that larger planets have wider HZs than do smaller ones. Specifically, with the assumption that smaller planets will have less dense atmospheres, the inner edge of the HZ (runaway greenhouse limit) moves outward (approx.10% lower than Earth flux) for low mass planets due to larger greenhouse effect arising from the increased H2O column depth. For larger planets, the H2O column depth is smaller, and higher temperatures are needed before water vapor completely dominates the outgoing long-wave radiation. Hence the inner edge moves inward (approx.7% higher than Earth's flux). The outer HZ changes little due to the competing effects of the greenhouse effect and an increase in albedo. New, three-dimensional climate model results from other groups are also summarized, and we argue that further, independent studies are needed to verify their predictions. Combined with our previous work, the results presented here provide refined estimates of HZs around main-sequence stars and provide a step toward a more comprehensive analysis of HZs.
Publication Date: May 15, 2014
Document ID:
20160005749
(Acquired May 05, 2016)
Subject Category: LUNAR AND PLANETARY SCIENCE AND EXPLORATION
Report/Patent Number: GSFC-E-DAA-TN21697
Document Type: Journal Article
Publication Information: The Astrophysical Journal Letters; Volume 787; No. 2; 1-6
Publisher Information: AAS
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 6p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: MAIN SEQUENCE STARS; EXTRASOLAR PLANETS; PLANETARY MASS; LONG WAVE RADIATION; ATMOSPHERIC PRESSURE; STELLAR TEMPERATURE; WATER VAPOR; TERRESTRIAL PLANETS; THREE DIMENSIONAL MODELS; PLANETS
Other Descriptors: MAIN SEQUENCE STARTS; HABITABLE ZONES; PLANETARY MASS
Availability Source: Other Sources
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