Revised Exoplanet Radii and Habitability Using Gaia Data Release 2

被引：18

作者：

Johns, Daniel ^{[1
]}

Marti, Connor ^{[2
]}

Huff, Madison ^{[3
]}

McCann, Jacob ^{[1
]}

Wittenmyer, Robert A. ^{[4
]}

Horner, Jonathan ^{[4
]}

Wright, Duncan J. ^{[4
]}

机构：

[1] Kutztown State Univ, Dept Phys Sci, Kutztown, PA 19530 USA

[2] Williams Coll, Dept Astron, Williamstown, MA 01267 USA

[3] Westminster Coll, Dept Phys, New Wilmington, PA 16172 USA

[4] Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2018年 / 239卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

astrobiology; planets and satellites: fundamental parameters; planets and satellites: general; catalogs; surveys; TRANSITING EXOPLANETS; GIANT PLANET; JUPITER; STARS; EVOLUTION; COMPANION; SEARCH; ULTRAVIOLET; ATMOSPHERE; DISCOVERY;

D O I：

10.3847/1538-4365/aae5fb

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Accurate stellar properties are crucial for determining exoplanet characteristics. Gaia DR2 presents revised distances, luminosities, and radii for 1.6 billion stars. Here, we report the calculation of revised radii and densities for 320 non-Kepler exoplanets using this data and present updated calculations of the incident flux received by 690 known exoplanets. This allows us to reassess the likelihood that those planets orbit in the habitable zone of their host stars. As a result of this analysis, three planets can be added to the catalog of potentially habitable worlds: HIP 67537 b, HD. 148156 b, and HD. 106720 b. In addition, the changed parameterization of BD + 49. 898 means that its planet, BD + 49. 898 b, now receives an incident flux that places it outside the optimistic habitable zone region, as defined by Kopparapu et al. We find that use of the new Gaia data results in a mean increase in the calculated exoplanet radius of 3.76%. Previously, CoRoT-3 b had been reported as having the highest density of all known exoplanets. Here, we use updated information to revise the calculated density of CoRoT-b from 26.4 to 16.1 +/- 3.98 g cm(-3). We also report the densest exoplanet in our data set, KELT-1. b, with a density of 22.1(-9.16)(+5.62) g cm(-3). Overall, our results highlight the importance of ensuring the parameterizations of known exoplanets are revisited whenever significant improvements are made to the precision of the stellar parameters upon which they are based.

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页数：10

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