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Supplementing <jats:italic>K<\/jats:italic>2 photometry with follow-up <jats:italic>Spitzer<\/jats:italic> transit observations refined the transit ephemerides of K2-3 b, c, and d by over a factor of 10. We analyze ground-based photometry from the Evryscope and Fairborn Observatory to determine the characteristic stellar activity timescales for our Gaussian Process fit, including the stellar rotation period and activity region decay timescale. The stellar rotation signals for both stars are evident in the radial velocity data and is included in our fit using a Gaussian process trained on the photometry. We find the masses of K2-3 b, K2-3 c, and GJ3470 b to be 6.48<jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajaaf79cieqn1.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>, 2.14<jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajaaf79cieqn2.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>, and 12.58<jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ajaaf79cieqn3.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>\n                  <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2295,<\/jats:sub> respectively. K2-3 d was not significantly detected and has a 3<jats:italic>\u03c3<\/jats:italic> upper limit of 2.80 <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2295<\/jats:sub>. These two systems are training cases for future TESS systems; due to the low planet densities (<jats:italic>\u03c1<\/jats:italic>\u00a0&lt;\u00a03.7 g cm<jats:sup>\u22123<\/jats:sup>) and bright host stars (<jats:italic>K<\/jats:italic>\u00a0&lt;\u00a09 mag), they are among the best candidates for transmission spectroscopy in order to characterize the atmospheric compositions of small planets.<\/jats:p>","DOI":"10.3847\/1538-3881\/aaf79c","type":"journal-article","created":{"date-parts":[[2019,2,5]],"date-time":"2019-02-05T14:14:24Z","timestamp":1549376064000},"page":"97","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":55,"title":["Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, and d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits"],"prefix":"10.3847","volume":"157","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6115-4359","authenticated-orcid":false,"given":"Molly R.","family":"Kosiarek","sequence":"first","affiliation":[]},{"given":"Ian J. 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