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Kepler-445, Kepler-...
Kepler-445, Kepler-446 and the Occurrence of Compact Multiples Orbiting mid-M Dwarf Stars
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Muirhead, Philip S. (author)
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Mann, Andrew W. (author)
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Vanderburg, Andrew (author)
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Morton, Timothy D. (author)
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Kraus, Adam (author)
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Ireland, Michael (author)
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Swift, Jonathan J. (author)
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- Feiden, Gregory A. (author)
- Uppsala universitet,Teoretisk astrofysik
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Gaidos, Eric (author)
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Gazak, J. Zachary (author)
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(creator_code:org_t)
- 2015
- 2015
- English.
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In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 801:1
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- We confirm and characterize the exoplanetary systems Kepler-445 and Kepler-446: two mid-M dwarf stars, each with multiple, small, short-period transiting planets. Kepler-445 is a metal-rich ([ Fe/H] = + 0.25 0.10) M4 dwarf with three transiting planets, and Kepler-446 is a metal-poor ([ Fe/H] = -0.30 0.10) M4 dwarf also with three transiting planets. Kepler-445c is similar toGJ 1214b: both in planetary radius and the properties of the host star. The Kepler-446 system is similar to the Kepler-42 system: both are metal-poor with large galactic space velocities and three short-period, likely rocky transiting planets that were initially assigned erroneously large planet-to-star radius ratios. We independently determined stellar parameters from spectroscopy and searched for and fitted the transit light curves for the planets, imposing a strict prior on stellar density in order to remove correlations between the fitted impact parameter and planet-to-star radius ratio for short-duration transits. Combining Kepler-445, Kepler-446, and Kepler-42, and isolating all mid-M dwarf stars observed by Kepler with the precision necessary to detect similar systems, we calculate that 21+ 7 -5 % of mid-M dwarf stars host compact multiples ( multiple planets with periods of less than 10 days) for a wide range of metallicities. We suggest that the inferred planet masses for these systems support highly efficient accretion of protoplanetary disk metals by mid-M dwarf protoplanets.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- planetary systems
- stars: fundamental parameters
- stars: individual (KOI-2704
- KOI-2842
- Kepler-42
- Barnard's Star)
- stars: late-type
- stars: low-mass
Publication and Content Type
- ref (subject category)
- art (subject category)
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Muirhead, Philip ...
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Mann, Andrew W.
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Vanderburg, Andr ...
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Morton, Timothy ...
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Kraus, Adam
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Ireland, Michael
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Swift, Jonathan ...
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Feiden, Gregory ...
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Gaidos, Eric
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Gazak, J. Zachar ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Uppsala University