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|a Winn, Joshua Nathan
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|a Massachusetts Institute of Technology. Department of Physics
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Winn, Joshua Nathan
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|a Winn, Joshua Nathan
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|a Matthews, Jaymie M.
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|a Dawson, Rebekah I.
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|a Fabrycky, Daniel C.
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|a Holman, Matthew J.
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|a Kallinger, Thomas
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|a Kuschnig, Rainer
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|a Sasselov, Dimitar
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|a Dragomir, Diana
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|a Guenther, David B.
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|a Moffat, Anthony F.
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|a Rowe, Jason F.
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|a Rucinski, Slavek
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|a Weiss, Werner W.
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|a A Super-Earth Transiting a Naked-Eye Star
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|b IOP Publishing,
|c 2012-06-11T15:04:51Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/71127
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|a We have detected transits of the innermost planet "e" orbiting 55 Cnc (V = 6.0), based on two weeks of nearly continuous photometric monitoring with the MOST space telescope. The transits occur with the period (0.74 days) and phase that had been predicted by Dawson & Fabrycky, and with the expected duration and depth for the crossing of a Sun-like star by a hot super-Earth. Assuming the star's mass and radius to be 0.963+0.051 - 0.029 M ☉ and 0.943 ± 0.010 R ☉, the planet's mass, radius, and mean density are 8.63 ± 0.35 M ⊕, 2.00 ± 0.14 R ⊕, and 5.9(superscript +1.5) - 1.1 g cm(superscript -3), respectively. The mean density is comparable to that of Earth, despite the greater mass and consequently greater compression of the interior of 55 Cnc e. This suggests a rock-iron composition supplemented by a significant mass of water, gas, or other light elements. Outside of transits, we detected a sinusoidal signal resembling the expected signal due to the changing illuminated phase of the planet, but with a full range (168 ± 70 ppm) too large to be reflected light or thermal emission. This signal has no straightforward interpretation and should be checked with further observations. The host star of 55 Cnc e is brighter than that of any other known transiting planet, which will facilitate future investigations.
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|a Article
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|t Astrophysical Journal. Letters
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