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dc.contributor.authorObermeier, Christian
dc.contributor.authorHenning, Thomas
dc.contributor.authorSchlieder, Joshua E.
dc.contributor.authorCrossfield, Ian J. M.
dc.contributor.authorPetigura, Erik
dc.contributor.authorHoward, Andrew W.
dc.contributor.authorSinukoff, Evan
dc.contributor.authorIsaacson, Howard T.
dc.contributor.authorCiardi, David R.
dc.contributor.authorDavid, Trevor J.
dc.contributor.authorHillenbrand, Lynne A.
dc.contributor.authorBeichman, Charles A.
dc.contributor.authorHowell, Steve B.
dc.contributor.authorHorch, Elliott
dc.contributor.authorEverett, Mark
dc.contributor.authorHirsch, Lea
dc.contributor.authorVogt, Steven S.
dc.contributor.authorChristiansen, Jessie L.
dc.contributor.authorLépine, Sébastien
dc.contributor.authorAller, Kimberly M.
dc.contributor.authorLiu, Michael C.
dc.contributor.authorSaglia, R. P.
dc.contributor.authorLivingston, John
dc.contributor.authorKluge, Matthias
dc.date.accessioned2017-03-02T00:44:39Z
dc.date.available2017-03-02T00:44:39Z
dc.date.issued2016-12-07
dc.identifier.citationK2 DISCOVERS A BUSY BEE: AN UNUSUAL TRANSITING NEPTUNE FOUND IN THE BEEHIVE CLUSTER 2016, 152 (6):223 The Astronomical Journalen
dc.identifier.issn1538-3881
dc.identifier.doi10.3847/1538-3881/152/6/223
dc.identifier.urihttp://hdl.handle.net/10150/622698
dc.description.abstractOpen clusters have been the focus of several exoplanet surveys, but only a few planets have so far been discovered. The Kepler spacecraft revealed an abundance of small planets around small cool stars, therefore, such cluster members are prime targets for exoplanet transit searches. Kepler's new mission, K2, is targeting several open clusters and star-forming regions around the ecliptic to search for transiting planets around their low-mass constituents. Here, we report the discovery of the first transiting planet in the intermediate-age (800 Myr) Beehive cluster (Praesepe). K2-95 is a faint (Kp = 15.5 mag) M3.0 +/- 0.5 dwarf from K2's Campaign 5 with an effective temperature of 3471 +/- 124 K, approximately solar metallicity and a radius of 0.402 +/- 0.050 R-circle dot. We detected a transiting planet with a radius of 3.47(-0.53)(+0.78)R(circle plus) and an orbital period of 10.134 days. We combined photometry, medium/high-resolution spectroscopy, adaptive optics/speckle imaging, and archival survey images to rule out any false-positive detection scenarios, validate the planet, and further characterize the system. The planet's radius is very unusual as M-dwarf field stars rarely have Neptune-sized transiting planets. The comparatively large radius of K2-95b is consistent with the other recently discovered cluster planets K2-25b (Hyades) and K2-33b (Upper Scorpius), indicating systematic differences in their evolutionary states or formation. These discoveries from K2 provide a snapshot of planet formation and evolution in cluster environments and thus make excellent laboratories to test differences between field-star and cluster planet populations.
dc.description.sponsorshipHubble Fellowship; NASA [NNH14CK55B]en
dc.language.isoenen
dc.publisherIOP PUBLISHING LTDen
dc.relation.urlhttp://stacks.iop.org/1538-3881/152/i=6/a=223?key=crossref.35d1e4a0a4d7e4820b65520982c3c27een
dc.rights© 2016. The American Astronomical Society. All rights reserved.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjecteclipsesen
dc.subjectstars: individual (K2-95)en
dc.subjectstars: low-massen
dc.subjecttechniques: photometricen
dc.subjecttechniques: spectroscopicen
dc.titleK2 DISCOVERS A BUSY BEE: AN UNUSUAL TRANSITING NEPTUNE FOUND IN THE BEEHIVE CLUSTERen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Lunar & Planetary Laben
dc.identifier.journalThe Astronomical Journalen
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
refterms.dateFOA2018-09-11T17:47:42Z
html.description.abstractOpen clusters have been the focus of several exoplanet surveys, but only a few planets have so far been discovered. The Kepler spacecraft revealed an abundance of small planets around small cool stars, therefore, such cluster members are prime targets for exoplanet transit searches. Kepler's new mission, K2, is targeting several open clusters and star-forming regions around the ecliptic to search for transiting planets around their low-mass constituents. Here, we report the discovery of the first transiting planet in the intermediate-age (800 Myr) Beehive cluster (Praesepe). K2-95 is a faint (Kp = 15.5 mag) M3.0 +/- 0.5 dwarf from K2's Campaign 5 with an effective temperature of 3471 +/- 124 K, approximately solar metallicity and a radius of 0.402 +/- 0.050 R-circle dot. We detected a transiting planet with a radius of 3.47(-0.53)(+0.78)R(circle plus) and an orbital period of 10.134 days. We combined photometry, medium/high-resolution spectroscopy, adaptive optics/speckle imaging, and archival survey images to rule out any false-positive detection scenarios, validate the planet, and further characterize the system. The planet's radius is very unusual as M-dwarf field stars rarely have Neptune-sized transiting planets. The comparatively large radius of K2-95b is consistent with the other recently discovered cluster planets K2-25b (Hyades) and K2-33b (Upper Scorpius), indicating systematic differences in their evolutionary states or formation. These discoveries from K2 provide a snapshot of planet formation and evolution in cluster environments and thus make excellent laboratories to test differences between field-star and cluster planet populations.


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