{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T04:42:36Z","timestamp":1777437756707,"version":"3.51.4"},"reference-count":60,"publisher":"SAGE Publications","issue":"1","license":[{"start":{"date-parts":[[2020,1,1]],"date-time":"2020-01-01T00:00:00Z","timestamp":1577836800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Astrobiology"],"published-print":{"date-parts":[[2020,1]]},"abstract":"<jats:p>\n                    Variations in the axial tilt, or obliquity, of terrestrial planets can affect their climates and therefore their habitability. Kepler-62f is a 1.4 R\n                    <jats:sub>\u2295<\/jats:sub>\n                    planet orbiting within the habitable zone of its K2 dwarf host star. We perform N-body simulations that monitor the evolution of obliquity of Kepler-62f for 10-million-year timescales to explore the effects on model assumptions, such as the masses of the Kepler-62 planets and the possibility of outer bodies. Significant obliquity variation occurs when the rotational precession frequency overlaps with one or more of the secular orbital frequencies, but most variations are limited to \u227210\u00b0. Moderate variations (\u223c10\u201320\u00b0) can occur over a broader range of initial obliquities when the relative nodal longitude (\u0394\u03a9) overlaps with the frequency and phase of a given secular mode. However, we find that adding outer gas giants on long-period orbits (\u223c1000 days) can produce large (\u223c60\u00b0) variations in obliquity if Kepler-62f has a very rapid (4\u2009h) rotation period. The possibility of giant planets on long-period orbits impacts the climate and habitability of Kepler-62f through variations in the latitudinal surface flux, where large variations can occur on million year timescales.\n                  <\/jats:p>","DOI":"10.1089\/ast.2018.1932","type":"journal-article","created":{"date-parts":[[2019,10,15]],"date-time":"2019-10-15T15:30:02Z","timestamp":1571153402000},"page":"73-90","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":14,"title":["Obliquity Evolution of the Potentially Habitable Exoplanet Kepler-62f"],"prefix":"10.1177","volume":"20","author":[{"given":"Billy","family":"Quarles","sequence":"first","affiliation":[{"name":"Center for Relativistic Astrophysics, School of Physics, Georgia Institute of Technology, Atlanta, Georgia."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jason W.","family":"Barnes","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Idaho, Moscow, Idaho."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jack J.","family":"Lissauer","sequence":"additional","affiliation":[{"name":"NASA Ames Research Center, Astrobiology and Space Science Division MS 245-3, Moffett Field, California."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John","family":"Chambers","sequence":"additional","affiliation":[{"name":"Department of Terrestrial Magnetism, Carnegie Institution for Science, Washington, District of Columbia."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2020,1,20]]},"reference":[{"key":"e_1_3_4_2_1","doi-asserted-by":"publisher","DOI":"10.1089\/ast.2013.1129"},{"key":"e_1_3_4_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.icarus.2004.05.007"},{"key":"e_1_3_4_4_1","doi-asserted-by":"publisher","DOI":"10.3847\/0004-637X\/816\/2\/66"},{"key":"e_1_3_4_5_1","doi-asserted-by":"publisher","DOI":"10.1089\/ast.2015.1427"},{"key":"e_1_3_4_6_1","doi-asserted-by":"publisher","DOI":"10.1051\/0004-6361\/201525909"},{"key":"e_1_3_4_7_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1234702"},{"key":"e_1_3_4_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.icarus.2011.02.024"},{"key":"e_1_3_4_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature04577"},{"key":"e_1_3_4_10_1","doi-asserted-by":"publisher","DOI":"10.1006\/icar.1996.0019"},{"key":"e_1_3_4_11_1","doi-asserted-by":"publisher","DOI":"10.3847\/1538-4357\/834\/1\/17"},{"key":"e_1_3_4_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0019-1035(03)00043-5"},{"key":"e_1_3_4_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0019-1035(03)00042-3"},{"key":"e_1_3_4_14_1","doi-asserted-by":"publisher","DOI":"10.3847\/1538-3881\/aaa301"},{"key":"e_1_3_4_15_1","doi-asserted-by":"publisher","DOI":"10.3847\/1538-3881\/aac214"},{"key":"e_1_3_4_16_1","doi-asserted-by":"publisher","DOI":"10.1088\/0004-637X\/790\/2\/146"},{"key":"e_1_3_4_17_1","doi-asserted-by":"publisher","DOI":"10.1088\/0004-637X\/761\/2\/92"},{"key":"e_1_3_4_18_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10569-009-9209-2"},{"key":"e_1_3_4_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.icarus.2012.10.019"},{"key":"e_1_3_4_20_1","doi-asserted-by":"publisher","DOI":"10.1006\/icar.1993.1169"},{"key":"e_1_3_4_21_1","first-page":"2510","article-title":"Tilting Saturn. II. Numerical model","volume":"128","author":"Hamilton D.P.","year":"2004","unstructured":"Hamilton D.P., and Ward W.R. (2004) Tilting Saturn. II. Numerical model. Astrophys J, 128:2510\u20132517.","journal-title":"Astrophys J"},{"key":"e_1_3_4_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pss.2014.09.004"},{"key":"e_1_3_4_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.icarus.2016.07.006"},{"key":"e_1_3_4_24_1","doi-asserted-by":"publisher","DOI":"10.3847\/1538-3881\/aa8fce"},{"key":"e_1_3_4_25_1","doi-asserted-by":"publisher","DOI":"10.3847\/0004-637X\/830\/1\/1"},{"key":"e_1_3_4_26_1","doi-asserted-by":"publisher","DOI":"10.1006\/icar.1993.1010"},{"key":"e_1_3_4_27_1","doi-asserted-by":"publisher","DOI":"10.3847\/1538-4357\/aa7a03"},{"key":"e_1_3_4_28_1","doi-asserted-by":"publisher","DOI":"10.1088\/0004-637X\/765\/2\/131"},{"key":"e_1_3_4_29_1","doi-asserted-by":"publisher","DOI":"10.1088\/2041-8205\/787\/2\/L29"},{"key":"e_1_3_4_30_1","doi-asserted-by":"publisher","DOI":"10.3847\/0004-637X\/819\/1\/84"},{"key":"e_1_3_4_31_1","doi-asserted-by":"publisher","DOI":"10.1038\/361615a0"},{"key":"e_1_3_4_32_1","doi-asserted-by":"publisher","DOI":"10.1038\/361608a0"},{"key":"e_1_3_4_33_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.icarus.2007.03.005"},{"key":"e_1_3_4_34_1","doi-asserted-by":"publisher","DOI":"10.1088\/0004-637X\/790\/1\/69"},{"key":"e_1_3_4_35_1","doi-asserted-by":"publisher","DOI":"10.1088\/0004-637X\/795\/1\/67"},{"key":"e_1_3_4_36_1","doi-asserted-by":"publisher","DOI":"10.1017\/CBO9781139050463"},{"key":"e_1_3_4_37_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.icarus.2011.10.013"},{"key":"e_1_3_4_38_1","doi-asserted-by":"publisher","DOI":"10.1088\/0004-637X\/784\/1\/44"},{"key":"e_1_3_4_39_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2011.08.030"},{"key":"e_1_3_4_40_1","doi-asserted-by":"publisher","DOI":"10.3847\/1538-3881\/ab0899"},{"key":"e_1_3_4_41_1","doi-asserted-by":"publisher","DOI":"10.3847\/0004-637X\/832\/1\/34"},{"key":"e_1_3_4_42_1","doi-asserted-by":"publisher","DOI":"10.1017\/CBO9781139174817"},{"key":"e_1_3_4_43_1","first-page":"4627","article-title":"The ice cap zone: a unique habitable zone for ocean worlds","volume":"477","author":"Ramirez R.M.","year":"2018","unstructured":"Ramirez R.M., and Levi A. (2018) The ice cap zone: a unique habitable zone for ocean worlds. Mon Not R Astron Soc, 477:4627\u20134640.","journal-title":"Mon Not R Astron Soc"},{"key":"e_1_3_4_44_1","first-page":"914320","article-title":"Transiting Exoplanet Survey Satellite (TESS)","volume":"9143","author":"Ricker G.R.","year":"2014","unstructured":"Ricker G.R., , Winn J.N., , Vanderspek R., , Latham D.W., , Bakos G, .\u00c1., Bean J.L., , Berta-Thompson Z.K., , Brown T.M., , Buchhave L., , Butler N.R., , Butler R.P., , Chaplin W.J., , Charbonneau D., , Christensen-Dalsgaard J., , Clampin M., , Deming D., , Doty J., , De Lee N., , Dressing C., , Dunham E.W., , Endl M., , Fressin F., , Ge J., , Henning T., , Holman M.J., , Howard A.W., , Ida S., , Jenkins J., , Jernigan G., , Johnson J.A., , Kaltenegger L., , Kawai N., , Kjeldsen H., , Laughlin G., , Levine A.M., , Lin D., , Lissauer J.J., , MacQueen P., , Marcy G., , McCullough P.R., , Morton T.D., , Narita N., , Paegert M., , Palle E., , Pepe F., , Pepper J., , Quirrenbach A., , Rinehart S.A., , Sasselov D., , Sato B., , Seager S., , Sozzetti A., , Stassun K.G., , Sullivan P., , Szentgyorgyi A., , Torres G., , Udry S., , and Villasenor J. (2014) Transiting Exoplanet Survey Satellite (TESS). Space Telescopes and Instrumentation 2014:, 9143:914320.","journal-title":"Space Telescopes and Instrumentation 2014:"},{"key":"e_1_3_4_45_1","doi-asserted-by":"publisher","DOI":"10.1088\/0004-637X\/801\/1\/41"},{"key":"e_1_3_4_46_1","doi-asserted-by":"publisher","DOI":"10.1088\/0004-637X\/784\/1\/45"},{"key":"e_1_3_4_47_1","doi-asserted-by":"publisher","DOI":"10.1051\/0004-6361\/201834344e"},{"key":"e_1_3_4_48_1","doi-asserted-by":"publisher","DOI":"10.3847\/1538-3881\/aabfd1"},{"key":"e_1_3_4_49_1","doi-asserted-by":"publisher","DOI":"10.1089\/ast.2015.1353"},{"key":"e_1_3_4_50_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00048443"},{"key":"e_1_3_4_51_1","doi-asserted-by":"publisher","DOI":"10.1088\/0004-637X\/691\/1\/596"},{"key":"e_1_3_4_52_1","doi-asserted-by":"publisher","DOI":"10.1088\/0004-637X\/721\/2\/1308"},{"key":"e_1_3_4_53_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.259.5099.1294"},{"key":"e_1_3_4_54_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.181.4096.260"},{"key":"e_1_3_4_55_1","doi-asserted-by":"publisher","DOI":"10.1086\/424533"},{"key":"e_1_3_4_56_1","doi-asserted-by":"publisher","DOI":"10.1088\/2041-8205\/783\/1\/L6"},{"key":"e_1_3_4_57_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.icarus.2017.01.011"},{"key":"e_1_3_4_58_1","doi-asserted-by":"publisher","DOI":"10.1006\/icar.1997.5759"},{"key":"e_1_3_4_59_1","doi-asserted-by":"publisher","DOI":"10.1017\/S1473550402001064"},{"key":"e_1_3_4_60_1","doi-asserted-by":"publisher","DOI":"10.1017\/S1473550403001356"},{"key":"e_1_3_4_61_1","doi-asserted-by":"publisher","DOI":"10.3847\/0004-637X\/825\/1\/19"}],"container-title":["Astrobiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1089\/ast.2018.1932","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1089\/ast.2018.1932","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1089\/ast.2018.1932","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T12:03:05Z","timestamp":1777377785000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1089\/ast.2018.1932"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,1]]},"references-count":60,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2020,1]]}},"alternative-id":["10.1089\/ast.2018.1932"],"URL":"https:\/\/doi.org\/10.1089\/ast.2018.1932","relation":{},"ISSN":["1531-1074","1557-8070"],"issn-type":[{"value":"1531-1074","type":"print"},{"value":"1557-8070","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,1]]}}}