Browsing by Author "Newton, Elisabeth R"

Now showing items 1-10 of 10

    • Calibration of the MEarth Photometric System: Optical Magnitudes and Photometric Metallicity Estimates for 1802 Nearby M-dwarfs 

      Dittmann, Jason Adam; Irwin, Jonathan; Charbonneau, David; Newton, Elisabeth R (American Astronomical Society, 2016)
      The MEarth Project is a photometric survey systematically searching the smallest stars nearest to the Sun for transiting rocky planets. Since 2008, MEarth has taken approximately two million images of 1844 stars suspected ...

    • An Empirical Calibration to Estimate Cool Dwarf Fundamental Parameters From H-Band Spectra 

      Newton, Elisabeth R; Charbonneau, David; Irwin, Jonathan; Mann, Andrew W. (IOP Publishing, 2015)
      Interferometric radius measurements provide a direct probe of the fundamental parameters of M dwarfs. However, interferometry is within reach for only a limited sample of nearby, bright stars. We use interferometrically ...

    • The Evolution of Rotation and Magnetism in Small Stars Near the Sun 

      Newton, Elisabeth R. (2016-05-19)
      Despite the prevalence of M dwarfs, the smallest and most common type of main sequence star, their sizes, compositions, and ages are not well-constrained. Empirical determination of these properties is important for gaining ...

    • Exoplanet Characterization by Proxy: A Transiting 2.15 R⊕ Planet Near the Habitable Zone of the Late K Dwarf Kepler-61 

      Ballard, Sarah; Charbonneau, David; Fressin, Francois; Torres, Guillermo; Irwin, Jonathan; Desert, Jean-Michel; Newton, Elisabeth R; Mann, Andrew W.; Ciardi, David R.; Crepp, Justin R.; Henze, Christopher E.; Bryson, Stephen T.; Howell, Steven B.; Horch, Elliott P.; Everett, Mark E.; Shporer, Avi (IOP Publishing, 2013)
      We present the validation and characterization of Kepler-61b: a 2.15 R ⊕ planet orbiting near the inner edge of the habitable zone of a low-mass star. Our characterization of the host star Kepler-61 is based upon a comparison ...

    • The Impact of Stellar Rotation on the Detectability of Habitable Planets Around M Dwarfs 

      Newton, Elisabeth R; Irwin, Jonathan; Charbonneau, David; Berta-Thompson, Zachory K.; Dittmann, Jason Adam (American Astronomical Society, 2016)
      Stellar activity and rotation frustrate the detection of exoplanets through the radial velocity technique. This effect is particularly of concern for M dwarfs, which can remain magnetically active for billions of years. ...

    • The MEarth-North and MEarth-South transit surveys: searching for habitable super-Earth exoplanets around nearby M-dwarfs 

      Irwin, Jonathan; Berta-Thompson, Zachory; Charbonneau, David; Dittmann, Jason Adam; Falco, Emilio; Newton, Elisabeth R; Nutzman, Philip (2014)
      Detection and characterization of potentially habitable Earthsize extrasolar planets is one of the major goals of contemporary astronomy. By applying the transit method to very low-mass M-dwarfs, it is possible to find ...

    • Near-Infrared Metallicities, Radial Velocities and Spectral Types for 447 Nearby M Dwarfs 

      Newton, Elisabeth R; Charbonneau, David; Irwin, Jonathan; Berta-Thompson, Zachory K.; Rojas-Ayala, Barbara; Covey, Kevin; Lloyd, James P. (IOP Publishing, 2013)
      We present metallicities, radial velocities, and near-infrared (NIR) spectral types for 447 M dwarfs determined from moderate resolution (R ≈ 2000) NIR spectra obtained with the NASA Infrared Telescope Facility (IRTF)/SpeX. ...

    • A rocky planet transiting a nearby low-mass star 

      Berta-Thompson, Zachory K.; Irwin, Jonathan; Charbonneau, David; Newton, Elisabeth R; Dittmann, Jason Adam; Astudillo-Defru, Nicola; Bonfils, Xavier; Gillon, Michaël; Jehin, Emmanuël; Stark, Antony A.; Stalder, Brian; Bouchy, Francois; Delfosse, Xavier; Forveille, Thierry; Lovis, Christophe; Mayor, Michel; Neves, Vasco; Pepe, Francesco; Santos, Nuno C.; Udry, Stéphane; Wünsche, Anaël (Springer Nature, 2015)
      M-dwarf stars – hydrogen-burning stars that are smaller than 60 per cent of the size of the Sun – are the most common class of star in our Galaxy and outnumber Sun-like stars by a ratio of 12:1. Recent results have shown ...

    • The Rotation and Galactic Kinematics of Mid M Dwarfs in the Solar Neighborhood 

      Newton, Elisabeth R; Irwin, Jonathan; Charbonneau, David; Berta-Thompson, Zachory K.; Dittmann, Jason Adam; West, Andrew A. (American Astronomical Society, 2016)
      Rotation is a directly observable stellar property, and it drives magnetic field generation and activity through a magnetic dynamo. Main-sequence stars with masses below approximately 0.35 ${M}_{\odot }$ (mid-to-late M ...

    • Zodiacal Exoplanets in Time (Zeit) Iii: A Short-Period Planet Orbiting a Pre-Main-Sequence Star in the Upper Scorpius Ob Association 

      Mann, Andrew W.; Newton, Elisabeth R; Rizzuto, Aaron C.; Irwin, Jonathan; Feiden, Gregory A.; Gaidos, Eric; Mace, Gregory N.; Kraus, Adam L.; James, David J.; Ansdell, Megan; Charbonneau, David; Covey, Kevin R.; Ireland, Michael J.; Jaffe, Daniel T.; Johnson, Marshall C.; Kidder, Benjamin; Vanderburg, Andrew Michael (American Astronomical Society, 2016)
      We confirm and characterize a close-in (Porb = 5.425 days), super-Neptune sized (5.04+0.34 −0.37 R⊕) planet transiting K2-33 (2MASS J16101473-1919095), a late-type (M3) pre-main sequence (11 Myr-old) star in the Upper ...