E. B. Ford

Publications (11)6.02 Total impact

• Article: Kepler-62: A five-planet system with planets of 1.4 and 1.6 Earth radii in the Habitable Zone

  W. J. Borucki, E. Agol, F. Fressin, L. Kaltenegger, J. Rowe, H. Isaacson, D. Fischer, N. Batalha, J. J. Lissauer, G. W. Marcy, [......], S. Seader, A. Shporer, J. H. Steffen, M. Still, P. Tenenbaum, S. E. Thompson, G. Torres, J. D. Twicken, W. F. Welsh, J. N. Winn
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  ABSTRACT: We present the detection of five planets -- Kepler-62b, c, d, e, and f -- of size 1.31, 0.54, 1.95, 1.61 and 1.41 Earth radii, orbiting a K2V star at periods of 5.7, 12.4, 18.2, 122.4 and 267.3 days, respectively. The outermost planets (Kepler-62e & -62f) are super-Earth-size (1.25 < planet radius/earth radius < 2.0) planets in the habitable zone (HZ) of their host star, receiving 1.2 +- 0.2 and 0.41 +- 0.05 times the solar flux at Earth's orbit. Theoretical models of Kepler-62e and -62f for a stellar age of ~7 Gyr suggest that both planets could be solid: either with a rocky composition or composed of mostly solid water in their bulk.
  04/2013;
• Source

  Available from: Avi Shporer

  Article: The architecture of the hierarchical triple star KOI 928 from eclipse timing variations seen in Kepler photometry

  J. H. Steffen, S. N. Quinn, W. J. Borucki, E. Brugamyer, S. T. Bryson, L. A. Buchhave, W. D. Cochran, M. Endl, D. C. Fabrycky, E. B. Ford, [......], J. F. Rowe, D. T. Sanderfer, S. E. Seader, D. Short, A. Shporer, S. E. Thompson, G. Torres, J. D. Twicken, W. F. Welsh, G. Windmiller
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  ABSTRACT: We present a hierarchical triple star system (KIC 9140402) where a low mass eclipsing binary orbits a more massive third star. The orbital period of the binary (4.98829 Days) is determined by the eclipse times seen in photometry from NASA's Kepler spacecraft. The periodically changing tidal field, due to the eccentric orbit of the binary about the tertiary, causes a change in the orbital period of the binary. The resulting eclipse timing variations provide insight into the dynamics and architecture of this system and allow the inference of the total mass of the binary ($0.424 \pm 0.017 \text{M}_\odot$) and the orbital parameters of the binary about the central star.
  06/2011;
• Source

  Available from: S. C. C. Barros

  Article: Ground-based multisite observations of two transits of HD 80606b

  A. Shporer, J. N. Winn, S. Dreizler, K. D. Colon, W. M. Wood-Vasey, P. I. Choi, C. Morley, C. Moutou, W. F. Welsh, D. Pollaco, [......], B. E. Nelson, L. Nortmann, F. Reyes, E. Roebuck, A. R. Rudy, R. Ruth, E Simpson, C. Vincent, G. Weaver, J. -W. Xie
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  ABSTRACT: We present ground-based optical observations of the September 2009 and January 2010 transits of HD 80606b. Based on 3 partial light curves of the September 2009 event, we derive a midtransit time of T_c [HJD] = 2455099.196 +- 0.026, which is about 1 sigma away from the previously predicted time. We observed the January 2010 event from 9 different locations, with most phases of the transit being observed by at least 3 different teams. We determine a midtransit time of T_c [HJD] = 2455210.6502 +- 0.0064, which is within 1.3 sigma of the time derived from a Spitzer observation of the same event. Comment: Accepted to ApJ. Comments are most welcome. v2: added acknowledgments
  The Astrophysical Journal 08/2010; · 6.02 Impact Factor
• Source

  Available from: adsabs.harvard.edu

  Article: Exoplanets and the Space Interferometry Mission

  G. W. Marcy, D. A. Fischer, C. McCarthy, E. B. Ford
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  ABSTRACT: The Doppler technique has revealed exoplanets with masses as low as 15 MEarth orbiting between 0.03 and 5.5 AU. The distribution of planet masses rises toward the lowest detectable masses and an increasing number of planets reside in larger orbits. The majority of planets reside in non-circular orbits and multiple planet systems are common, often trapped in resonances. The Space Interferometry Mission (SIM) will detect planets with masses less than 10 MEarth orbiting within 2 AU of nearby stars. It will measure the masses and orbits of rocky planets, testing theories of their formation and dynamical evolution in protoplanetary disks. For the closest stars, planets with masses as low as 3 MEarth within 1 AU are detectable at a secure level, and marginal detections of planets of 1 MEarth can be made. SIM will be the first mission to find rocky planets near the habitable zone of nearby stars, allowing follow-up by later imaging and spectroscopic missions, such as the "Terrestrial Planet Finder" and Darwin. Thus, SIM will provide TPF and Darwin a set of target stars enriched in rocky planets, increasing the efficiency of those missions by factors of at least ˜3. Indeed, SIM can dictate the timing of imaging observations by selecting orbital phases when the planet resides outside the diffraction blind spot.
  09/2005; 338:191.
• Article: Kepler-16: A Transiting Circumbinary Planet

  L ~R Doyle, J ~A Carter, D ~C Fabrycky, R ~W Slawson, S ~B Howell, J ~N Winn, J ~A Orosz, A Prv sa, W ~F Welsh, S ~N Quinn, [......], M ~L Calkins, D ~R Short, J ~H Steffen, D Sasselov, E ~W Dunham, W ~D Cochran, A Boss, M ~R Haas, D Buzasi, D Fischer
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  ABSTRACT: We report the detection of a planet whose orbit surrounds a pair of low-mass stars. Data from the Kepler spacecraft reveal transits of the planet across both stars, in addition to the mutual eclipses of the stars, giving precise constraints on the absolute dimensions of all three bodies. The planet is comparable to Saturn in mass and size and is on a nearly circular 229-day orbit around its two parent stars. The eclipsing stars are 20 and 69% as massive as the Sun and have an eccentric 41-day orbit. The motions of all three bodies are confined to within 0.5deg of a single plane, suggesting that the planet formed within a circumbinary disk.
  Science. 333:1602-.
• Article: A closely packed system of low-mass, low-density planets transiting Kepler-11

  J ~J Lissauer, D ~C Fabrycky, E ~B Ford, W ~J Borucki, F Fressin, G ~W Marcy, J ~A Orosz, J ~F Rowe, G Torres, W ~F Welsh, [......], D ~W Latham, E Lopez, S McCauliff, N Miller, R ~C Morehead, E ~V Quintana, D Ragozzine, D Sasselov, D ~R Short, J ~H Steffen
  nat. 470:53-58.
• Article: Kepler Planet-Detection Mission: Introduction and First Results

  W ~J Borucki, D Koch, G Basri, N Batalha, T Brown, D Caldwell, J Caldwell, J Christensen-Dalsgaard, W ~D Cochran, E DeVore, [......], E ~V Quintana, B ~D Clarke, C Allen, J Li, H Wu, P Tenenbaum, E Verner, F Bruhweiler, J Barnes, A Prsa
  Science. 327:977-.
• Article: Kepler-18b, c, and d: A System of Three Planets Confirmed by Transit Timing Variations, Light Curve Validation, Warm-Spitzer Photometry, and Radial Velocity Measurements

  W ~D Cochran, D ~C Fabrycky, G Torres, F Fressin, J -M Désert, D Ragozzine, D Sasselov, J ~J Fortney, J ~F Rowe, E ~J Brugamyer, [......], D ~A Fischer, M Everett, M Endl, B -O Demory, D Deming, D Charbonneau, D Caldwell, L Buchhave, T ~M Brown, N Batalha
  apjs. 197:7.
• Article: Characteristics of Kepler Planetary Candidates Based on the First Data Set

  W ~J Borucki, D ~G Koch, G Basri, N Batalha, A Boss, T ~M Brown, D Caldwell, J Christensen-Dalsgaard, W ~D Cochran, E DeVore, [......], A Prsa, E ~V Quintana, J Rowe, W Sherry, P Tenenbaum, G Torres, J ~D Twicken, J Van Cleve, L Walkowicz, H Wu
  apj. 728:117-+.
• Article: Kepler's First Rocky Planet: Kepler-10b

  N ~M Batalha, W ~J Borucki, S ~T Bryson, L ~A Buchhave, D ~A Caldwell, J Christensen-Dalsgaard, D Ciardi, E ~W Dunham, F Fressin, T ~N Gautier, [......], R ~C Morehead, D Ragozzine, P Tenenbaum, J Twicken, S Quinn, J VanCleve, L ~M Walkowicz, W ~F Welsh, E Devore, A Gould
  apj. 729:27-+.
• Article: Kepler-9: A System of Multiple Planets Transiting a Sun-Like Star, Confirmed by Timing Variations

  M ~J Holman, D ~C Fabrycky, D Ragozzine, E ~B Ford, J ~H Steffen, W ~F Welsh, J ~J Lissauer, D ~W Latham, G ~W Marcy, L ~M Walkowicz, [......], M Endl, D Fischer, G Fürész, J ~D Hartman, H Isaacson, J ~A Johnson, P ~J MacQueen, A ~V Moorhead, R ~C Morehead, J ~A Orosz
  Science. 330:51-.