THE ROCHE LIMIT FOR CLOSE-ORBITING PLANETS: MINIMUM DENSITY, COMPOSITION CONSTRAINTS, AND APPLICATION TO THE 4.2 hr PLANET KOI 1843.03

被引：90

作者：

Rappaport, Saul ^{[1
,2
]}

Sanchis-Ojeda, Roberto ^{[1
,2
]}

Rogers, Leslie A. ^{[3
,4
]}

Levine, Alan ^{[5
]}

Winn, Joshua N. ^{[1
,2
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[3] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[4] CALTECH, Dept Planetary Sci, Pasadena, CA 91125 USA

[5] 37 575 MIT Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 773卷 / 01期

关键词：

instabilities; planetary systems; planets and satellites: detection; planets and satellites: individual (KOI 1843); ERROR-CORRECTION; LIGHT CURVES; MASS; CANDIDATES; PERIODS; RADII;

D O I：

10.1088/2041-8205/773/1/L15

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The requirement that a planet must orbit outside of its Roche limit gives a lower limit on the planet's mean density. The minimum density depends almost entirely on the orbital period and is immune to systematic errors in the stellar properties. We consider the implications of this density constraint for the newly identified class of small planets with periods shorter than half a day. When the planet's radius is accurately known, this lower limit to the density can be used to restrict the possible combinations of iron and rock within the planet. Applied to KOI 1843.03, a 0.6 R-circle plus planet with the shortest known orbital period of 4.245 hr, the planet's mean density must be greater than or similar to 7 g cm(-3). By modeling the planetary interior subject to this constraint, we find that the composition of the planet must be mostly iron, with at most a modest fraction of silicates (less than or similar to 30% by mass).

引用

页数：5

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