{"id":742,"date":"2015-11-24T18:07:52","date_gmt":"2015-11-24T18:07:52","guid":{"rendered":"https:\/\/wordpress.nkisiland.com\/?p=742"},"modified":"2015-11-24T18:07:52","modified_gmt":"2015-11-24T18:07:52","slug":"discovery-and-validation-of-kepler-452b","status":"publish","type":"post","link":"https:\/\/wordpress.nkisiland.com\/?p=742","title":{"rendered":"DISCOVERY AND VALIDATION OF Kepler-452b"},"content":{"rendered":"<p>from the Astronomical Journal<br \/>\n<a href=\"http:\/\/dx.doi.org\/10.1088\/0004-6256\/150\/2\/56\">dx.doi.org\/10.1088\/0004-6256\/150\/2\/56<\/a><\/p>\n<p>We report on the discovery and validation of Kepler-452b, a transiting planet identified by a search through the 4 years of data collected by NASA&#8217;s <i>Kepler<\/i> Mission. This possibly rocky <img decoding=\"async\" src=\"http:\/\/cdn.iopscience.com\/images\/1538-3881\/150\/2\/56\/aj515345ieqn3.gif\" alt=\"${1.63}_{-0.20}^{+0.23}$\" align=\"MIDDLE\" \/> <img decoding=\"async\" src=\"http:\/\/cdn.iopscience.com\/images\/1538-3881\/150\/2\/56\/aj515345ieqn4.gif\" alt=\"${R}_{\\oplus }$\" align=\"MIDDLE\" \/> planet orbits its G2 host star every <img decoding=\"async\" src=\"http:\/\/cdn.iopscience.com\/images\/1538-3881\/150\/2\/56\/aj515345ieqn5.gif\" alt=\"${384.843}_{-0.012}^{+0.007}$\" align=\"MIDDLE\" \/> days, the longest orbital period for a small (<img decoding=\"async\" src=\"http:\/\/cdn.iopscience.com\/images\/1538-3881\/150\/2\/56\/aj515345ieqn6.gif\" alt=\"${R}_{{\\rm{P}}}\\lt 2$\" align=\"MIDDLE\" \/> <img decoding=\"async\" src=\"http:\/\/cdn.iopscience.com\/images\/1538-3881\/150\/2\/56\/aj515345ieqn7.gif\" alt=\"${R}_{\\oplus }$\" align=\"MIDDLE\" \/>) transiting exoplanet to date. The likelihood that this planet has a rocky composition lies between 49% and 62%. The star has an effective temperature of 5757 \u00b1 85 K and a <img decoding=\"async\" src=\"http:\/\/cdn.iopscience.com\/images\/1538-3881\/150\/2\/56\/aj515345ieqn8.gif\" alt=\"$\\mathrm{log}g$\" align=\"MIDDLE\" \/> of 4.32 \u00b1 0.09. At a mean orbital separation of <img decoding=\"async\" src=\"http:\/\/cdn.iopscience.com\/images\/1538-3881\/150\/2\/56\/aj515345ieqn9.gif\" alt=\"${1.046}_{-0.015}^{+0.019}$\" align=\"MIDDLE\" \/> AU, this small planet is well within the optimistic habitable zone of its star (recent Venus\/early Mars), experiencing only 10% more flux than Earth receives from the Sun today, and slightly outside the conservative habitable zone (runaway greenhouse\/maximum greenhouse). The star is slightly larger and older than the Sun, with a present radius of <img decoding=\"async\" src=\"http:\/\/cdn.iopscience.com\/images\/1538-3881\/150\/2\/56\/aj515345ieqn10.gif\" alt=\"${1.11}_{-0.09}^{+0.15}$\" align=\"MIDDLE\" \/> <img decoding=\"async\" src=\"http:\/\/cdn.iopscience.com\/images\/1538-3881\/150\/2\/56\/aj515345ieqn11.gif\" alt=\"${R}_{\\odot }$\" align=\"MIDDLE\" \/> and an estimated age of ~6 Gyr. Thus, Kepler-452b has likely always been in the habitable zone and should remain there for another ~3 Gyr.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>from the Astronomical Journal dx.doi.org\/10.1088\/0004-6256\/150\/2\/56 We report on the discovery and validation of Kepler-452b, a transiting planet identified by a search through the 4 years of data collected by NASA&#8217;s Kepler Mission. This possibly rocky planet orbits its G2 host &hellip; <a href=\"https:\/\/wordpress.nkisiland.com\/?p=742\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/wordpress.nkisiland.com\/index.php?rest_route=\/wp\/v2\/posts\/742"}],"collection":[{"href":"https:\/\/wordpress.nkisiland.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wordpress.nkisiland.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wordpress.nkisiland.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/wordpress.nkisiland.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=742"}],"version-history":[{"count":2,"href":"https:\/\/wordpress.nkisiland.com\/index.php?rest_route=\/wp\/v2\/posts\/742\/revisions"}],"predecessor-version":[{"id":744,"href":"https:\/\/wordpress.nkisiland.com\/index.php?rest_route=\/wp\/v2\/posts\/742\/revisions\/744"}],"wp:attachment":[{"href":"https:\/\/wordpress.nkisiland.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=742"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wordpress.nkisiland.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=742"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wordpress.nkisiland.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=742"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}