Characterizing K2 planet discoveries: a super-Earth transiting the bright K dwarf HIP 116454

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dc.creator Vanderburg, Andrew
dc.creator Montet, Benjamin T.
dc.creator Johnson, John Asher
dc.creator Buchhave, Lars A.
dc.creator Zeng, Li
dc.creator Pepe, Francesco
dc.creator Cameron, Andrew Collier
dc.creator Latham, David W.
dc.creator Molinari, Emilio
dc.creator Udry, Stephane
dc.creator Guenther, David B.
dc.date.accessioned 2017-04-06T13:15:58Z
dc.date.available 2017-04-06T13:15:58Z
dc.date.issued 2015-02-10
dc.identifier.issn 0004-637X
dc.identifier.uri http://library2.smu.ca/handle/01/26873
dc.description Publisher's version/PDF en_CA
dc.description.abstract We report the first planet discovery from the two-wheeled Kepler (K2) mission: HIP 116454 b. The host star HIP 116454 is a bright (V = 10.1, K = 8.0) K1 dwarf with high proper motion and a parallax-based distance of 55.2 [plus or minus] 5.4 pc. Based on high-resolution optical spectroscopy, we find that the host star is metal-poor with [Fe/H] = −0.16 [plus or minus] 0.08 and has a radius R[subscript star] = 0.716 [plus or minus] 0.024 R[subscript circled dot] and mass M[subscript star] = 0.775 [plus or minus] 0.027 M[subscript circled dot]. The star was observed by the Kepler spacecraft during its Two-Wheeled Concept Engineering Test in 2014 February. During the 9 days of observations, K2 observed a single transit event. Using a new K2 photometric analysis technique, we are able to correct small telescope drifts and recover the observed transit at high confidence, corresponding to a planetary radius of R[subscript p] = 2.53 [plus or minus] 0.18 R[subscript circled plus]. Radial velocity observations with the HARPS-N spectrograph reveal a 11.82 [plus or minus] 1.33 M[subscript circled plus] planet in a 9.1 day orbit, consistent with the transit depth, duration, and ephemeris. Follow-up photometric measurements from the MOST satellite confirm the transit observed in the K2 photometry and provide a refined ephemeris, making HIP 116454 b amenable for future follow-up observations of this latest addition to the growing population of transiting super-Earths around nearby, bright stars. en_CA
dc.language.iso en en_CA
dc.publisher American Astronomical Society en_CA
dc.relation.uri http://dx.doi.org/10.1088/0004-637X/800/1/59
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Extrasolar planets -- Detection
dc.subject.lcsh Stars with planets
dc.subject.lcsh Astronomical photometry
dc.title Characterizing K2 planet discoveries: a super-Earth transiting the bright K dwarf HIP 116454 en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astrophysical Journal 800(1), 59. (2015) en_CA


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Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
 
Published Version: http://dx.doi.org/10.1088/0004-637X/800/1/59
 
 

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