Kepler-93b: A Terrestrial World Measured to Within 120 Km, and a Test Case for a New Spitzer Observing Mode

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Kepler-93b: A Terrestrial World Measured to Within 120 Km, and a Test Case for a New Spitzer Observing Mode

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dc.contributor.author Ballard, Sarah
dc.contributor.author Chaplin, William J.
dc.contributor.author Charbonneau, David
dc.contributor.author Désert, Jean-Michel
dc.contributor.author Fressin, Francois
dc.contributor.author Zeng, Li
dc.contributor.author Werner, Michael W.
dc.contributor.author Davies, Guy R.
dc.contributor.author Aguirre, Victor Silva
dc.contributor.author Basu, Sarbani
dc.contributor.author Christensen-Dalsgaard, Jørgen
dc.contributor.author Metcalfe, Travis S.
dc.contributor.author Stello, Dennis
dc.contributor.author Bedding, Timothy R.
dc.contributor.author Campante, Tiago L.
dc.contributor.author Handberg, Rasmus
dc.contributor.author Karoff, Christoffer
dc.contributor.author Elsworth, Yvonne
dc.contributor.author Gilliland, Ronald L.
dc.contributor.author Hekker, Saskia
dc.contributor.author Huber, Daniel
dc.contributor.author Kawaler, Steven D.
dc.contributor.author Kjeldsen, Hans
dc.contributor.author Lund, Mikkel N.
dc.contributor.author Lundkvist, Mia
dc.date.accessioned 2017-01-17T19:20:01Z
dc.date.issued 2014
dc.identifier.citation Ballard, Sarah, William J. Chaplin, David Charbonneau, Jean-Michel Désert, Francois Fressin, Li Zeng, Michael W. Werner, et al. 2014. Kepler-93b: A Terrestrial World Measured to Within 120 Km, and a Test Case for a New Spitzer Observing Mode. The Astrophysical Journal 790, no. 1: 12. doi:10.1088/0004-637x/790/1/12. en_US
dc.identifier.issn 0004-637X en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:29991582
dc.description.abstract We present the characterization of the Kepler-93 exoplanetary system, based on three years of photometry gathered by the Kepler spacecraft. The duration and cadence of the Kepler observations, in tandem with the brightness of the star, enable unusually precise constraints on both the planet and its host. We conduct an asteroseismic analysis of the Kepler photometry and conclude that the star has an average density of 1.652 ± 0.006 g cm–3. Its mass of 0.911 ± 0.033 M ☉ renders it one of the lowest-mass subjects of asteroseismic study. An analysis of the transit signature produced by the planet Kepler-93b, which appears with a period of 4.72673978 ± 9.7 × 10–7 days, returns a consistent but less precise measurement of the stellar density, 1.72$^{+0.02}_{-0.28}$ g cm–3. The agreement of these two values lends credence to the planetary interpretation of the transit signal. The achromatic transit depth, as compared between Kepler and the Spitzer Space Telescope, supports the same conclusion. We observed seven transits of Kepler-93b with Spitzer, three of which we conducted in a new observing mode. The pointing strategy we employed to gather this subset of observations halved our uncertainty on the transit radius ratio RP /R sstarf. We find, after folding together the stellar radius measurement of 0.919 ± 0.011 R ☉ with the transit depth, a best-fit value for the planetary radius of 1.481 ± 0.019 R ⊕. The uncertainty of 120 km on our measurement of the planet's size currently renders it one of the most precisely measured planetary radii outside of the solar system. Together with the radius, the planetary mass of 3.8 ± 1.5 M ⊕ corresponds to a rocky density of 6.3 ± 2.6 g cm–3. After applying a prior on the plausible maximum densities of similarly sized worlds between 1 and 1.5 R ⊕, we find that Kepler-93b possesses an average density within this group. en_US
dc.description.sponsorship Astronomy en_US
dc.language.iso en_US en_US
dc.publisher IOP Publishing en_US
dc.relation.isversionof doi:10.1088/0004-637X/790/1/12 en_US
dc.relation.hasversion https://arxiv.org/pdf/1405.3659.pdf en_US
dash.license LAA
dc.subject eclipses en_US
dc.subject methods: observational en_US
dc.subject planetary systems en_US
dc.subject stars: individual (KOI 69 KIC 3544595) en_US
dc.title Kepler-93b: A Terrestrial World Measured to Within 120 Km, and a Test Case for a New Spitzer Observing Mode en_US
dc.type Journal Article en_US
dc.description.version Author's Original en_US
dc.relation.journal The Astrophysical Journal en_US
dash.depositing.author Charbonneau, David
dc.date.available 2017-01-17T19:20:01Z
dc.identifier.orcid ORCID  0000-0003-1957-6635 en_US

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