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        A nearby m star with three transiting super-earths discovered by k2

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        Author
        Crossfield, Ian J M
        Petigura, Erik
        Schlieder, Joshua E.
        Howard, Andrew W.
        Fulton, B. J.
        Aller, Kimberly M.
        Ciardi, David R.
        Lépine, Sébastien
        Barclay, Thomas
        Pater, Imke De
        Kleer, Katherine De
        Quintana, Elisa V.
        Christiansen, Jessie L.
        Schlafly, Eddie
        Kaltenegger, Lisa
        Crepp, Justin R.
        Henning, Thomas
        Obermeier, Christian
        Deacon, Niall
        Weiss, Lauren M.
        Isaacson, Howard T.
        Hansen, Brad M S
        Liu, Michael C.
        Greene, Tom
        Howell, Steve B.
        Barman, Travis
        Mordasini, Christoph
        Attention
        2299/18916
        Abstract
        Small, cool planets represent the typical end-products of planetary formation. Studying the architectures of these systems, measuring planet masses and radii, and observing these planets' atmospheres during transit directly informs theories of planet assembly, migration, and evolution. Here we report the discovery of three small planets orbiting a bright (Ks = 8.6 mag) M0 dwarf using data collected as part of K2, the new ecliptic survey using the re-purposed Kepler spacecraft. Stellar spectroscopy and K2 photometry indicate that the system hosts three transiting planets with radii 1.5-2.1 , straddling the transition region between rocky and increasingly volatile-dominated compositions. With orbital periods of 10-45 days the planets receive just 1.5-10x the flux incident on Earth, making these some of the coolest small planets known orbiting a nearby star; planet d is located near the inner edge of the system's habitable zone. The bright, low-mass star makes this system an excellent laboratory to determine the planets' masses via Doppler spectroscopy and to constrain their atmospheric compositions via transit spectroscopy. This discovery demonstrates the ability of K2 and future space-based transit searches to find many fascinating objects of interest.
        Publication date
        2015-05-01
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.1088/0004-637X/804/1/10
        Other links
        http://hdl.handle.net/2299/18916
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