Now showing items 11805-11824 of 43220

  • Discovery Of A Low-Mass Companion To The Solar-Type Star Tyc 2534-698-1 

    Kane, Steven R.; Mahadevan, Suvrath; Cochran, William D.; Street, Rachel A.; Sivarani, Thirupathi; Henry, Gregory W.; Williamson, Michael H. (2009-02)
    Brown dwarfs and low-mass stellar companions are interesting objects to study since they occupy the mass region between deuterium and hydrogen burning. We report here the serendipitous discovery of a low-mass companion in ...
  • Discovery Of A New AM CVn System With The Kepler Satellite 

    Fontaine, G.; Brassard, P.; Green, E. M.; Charpinet, S.; Dufour, Patrick; Hubeny, I.; Steeghs, D.; Aerts, C.; Randall, S. K.; Bergeron, P.; Guvenen, B.; O'Malley, C. J.; Van Grootel, V.; Ostensen, R. H.; Bloemen, S.; Silvotti, R.; Howell, Steve B.; Baran, A.; Kepler, S. O.; Marsh, T. R.; Montgomery, Michael H.; Oreiro, R.; Provencal, J.; Telting, J.; Winget, D. E.; Zima, W.; Christensen-Dalsgaard, J.; Kjeldsen, H. (2011-01)
    We report the discovery of a new AM CVn system on the basis of broadband photometry obtained with the Kepler satellite supplemented by ground-based optical spectroscopy. Initially retained on Kepler target lists as a ...
  • Discovery Of A Nova-Like Cataclysmic Variable In The Kepler Mission Field 

    Williams, Kurtis A.; de Martino, Domitilla; Silvotti, Roberto; Bruni, Ivan; Dufour, Patrick; Riecken, Thomas S.; Kronberg, Martin; Mukadam, Anjum; Handler, G. (2010-06)
    We announce the identification of a new cataclysmic variable (CV) star in the field of the Kepler Mission, KIC J192410.81+445934.9. This system was identified during a search for compact pulsators in the Kepler field. ...
  • Discovery Of A Wolf-Rayet Star Through Detection Of Its Photometric Variability 

    Littlefield, Colin; Garnavich, Peter; Marion, G. H.; Vinko, Jozsef; McClelland, Colin; Rettig, Terrence; Wheeler, J. Craig (2012-06)
    We report the serendipitous discovery of a heavily reddened Wolf-Rayet star that we name WR 142b. While photometrically monitoring a cataclysmic variable, we detected weak variability in a nearby field star. Low-resolution ...
  • Discovery of A ZZ Ceti in the Kepler Mission Field 

    Hermes, J. J.; Mullally, Fergal; Ostensen, R. H.; Williams, Kurtis A.; Telting, John; Southworth, John; Bloemen, S.; Howell, Steve B.; Everett, Mark; Winget, D. E. (2011-11)
    We report the discovery of the first identified pulsating DA white dwarf, WD J1916+3938 (Kepler ID 4552982), in the field of the Kepler mission. This ZZ Ceti star was first identified through ground-based, time-series ...
  • Discovery of an Ultramassive Pulsating White Dwarf 

    Hermes, J. J.; Kepler, S. O.; Castanheira, Barbara G.; Gianninas, A.; Winget, D. E.; Montgomery, M. H.; Brown, Warren R.; Harrold, Samuel T. (2013-07)
    We announce the discovery of the most massive pulsating hydrogen-atmosphere white dwarf (WD) ever discovered, GD 518. Model atmosphere fits to the optical spectrum of this star show it is a 12,030 +/- 210 K WD with a log ...
  • Discovery Of Binarity, Spectroscopic Frequency Analysis, And Mode Identification Of The Delta Scuti Star 4 CVn 

    Schmid, V. S.; Themessl, N.; Breger, M.; Degroote, P.; Aerts, C.; Beck, P. G.; Tkachenko, A.; Van Reeth, T.; Bloemen, S.; Debosscher, J.; Castanheira, B. G.; McArthur, B. E.; Papics, P. I.; Fritz, V.; Falcon, R. E. (2014-10)
    More than 40 years of ground-based photometric observations of the delta Sct star 4 CVn has revealed 18 independent oscillation frequencies, including radial as well as non-radial p-modes of low spherical degree l <= 2. ...
  • The Discovery of Entropy -- and its Implications 

    Schulman, Adam (2012-03-26)
  • Discovery Of Ethanol-Responsive Small Rnas In Zymomonas Mobilis 

    Cho, Seung Hee; Lei, Roy; Henninger, Trey D.; Contreras, Lydia M. (2014-07)
    Zymomonas mobilis is a bacterium that can produce ethanol by fermentation. Due to its unique metabolism and efficient ethanol production, Z. mobilis has attracted special interest for biofuel energy applications; an important ...
  • The Discovery Of Hd 37605C And A Dispositive Null Detection Of Transits Of Hd 37605B 

    Wang, Sharon Xuesong; Wright, Jason T.; Cochran, William; Kane, Steven R.; Henry, Gregory W.; Payne, Matthew J.; Endl, Michael; MacQueen, Phillip J.; Valenti, Jeff A.; Antoci, Victoria; Dragomir, Diana; Matthews, Jaymie M.; Howard, Andrew W.; Marcy, Geoffrey W.; Isaacson, Howard; Ford, Eric B.; Mahadevan, Suvrath; von Braun, Kaspar (2012-12)
    We report the radial velocity discovery of a second planetary mass companion to the K0 V star HD 37605, which was already known to host an eccentric, P similar to 55 days Jovian planet, HD 37605b. This second planet, HD ...
  • Discovery Of Lyman Break Galaxies At Z Similar To 7 From The Zfourge Survey 

    Tilvi, Vithal; Papovich, Casey; Tran, K. V. H.; Labbe, I.; Spitler, L. R.; Straatman, C. M. S.; Persson, S. E.; Monson, A.; Glazebrook, K.; Quadri, R. F.; van Dokkum, P.; Ashby, M. L. N.; Faber, S. M.; Fazio, G. G.; Finkelstein, Steven L.; Ferguson, Henry C.; Grogin, N. A.; Kacprzak, G. G.; Kelson, Daniel D.; Koekemoer, A. M.; Murphy, David; McCarthy, P. J.; Newman, Jeffrey A.; Salmon, Brett; Willner, S. P. (2013-05)
    Star-forming galaxies at redshiftsz > 6 are likely responsible for the reionization of the universe, and it is important to study the nature of these galaxies. We present three candidates for z similar to 7 Lyman break ...
  • Discovery Of Polarization Reverberation In NGC 4151 

    Gaskell, C. Martin; Goosmann, Rene W.; Merkulova, Nelly I.; Shakhovskoy, Nikolay M.; Shoji, Masatoshi (2012-04)
    Observations of the optical polarization of NGC 4151 in 1997-2003 show variations of an order of magnitude in the polarized flux while the polarization position angle remains constant. The amplitude of variability of the ...
  • Discovery Of Pulsations, Including Possible Pressure Modes, In Two New Extremely Low Mass, He-Core White Dwarfs 

    Hermes, J. J.; Montgomery, Michael H.; Winget, D. E.; Brown, Warren R.; Gianninas, A.; Kilic, Mukremin; Kenyon, S. J.; Bell, Keaton J.; Harrold, Samuel T. (2013-03)
    We report the discovery of the second and third pulsating extremely low mass (ELM) white dwarfs (WDs), SDSS J111215.82+111745.0 (hereafter J1112) and SDSS J151826.68+065813.2 (hereafter J1518). Both have masses < 0.25 ...
  • Discovery of Seven Companions To Intermediate-Mass Stars With Extreme Mass Ratios in the Scorpius-Centaurus Association 

    Hinkley, S.; Kraus, Adam L.; Ireland, Michael J.; Cheetham, Anthony; Carpenter, John M.; Tuthill, Peter; Lacour, Sylvestre; Evans, Thomas M.; Haubois, Xaubois (2015-06)
    We report the detection of seven low-mass companions to intermediate-mass stars (SpT B/A/F; M similar to 1.5-4.5M(circle dot)) in the Scorpius-Centaurus (Sco-Cen) Association using nonredundant aperture masking interferometry. ...
  • Discovery of SiCSi in IRC+10216: A Missing Link Between Gas and Dust Carriers of SiC Bonds 

    Cernicharo, J.; McCarthy, M. C.; Gottlieb, C. A.; Agundez, M.; Prieto, L. V.; Baraban, J. H.; Changala, P. B.; Guelin, M.; Kahane, C.; Martin-Drumel, M. A.; Patel, N. A.; Reilly, N. J.; Stanton, J. F.; Quintana-Lacaci, G.; Thorwirth, S.; Young, K. H. (2015-06)
    We report the discovery in space of a disilicon species, SiCSi, from observations between 80 and 350 GHz with the IRAM 30 m radio telescope. Owing to the close coordination between laboratory experiments and astrophysics, ...
  • The Discovery Of Stellar Oscillations In The K Giant Iota Draconis 

    Zechmeister, M.; Reffert, S.; Hatzes, A. P.; Endl, M.; Quirrenbach, A. (2008-11)
    iota Dra (HIP 75458) is a well-known example of a K giant hosting a substellar companion. We present radial velocity measurements of this star from observations taken with three different instruments spanning nearly 8 ...
  • Discovery of the Transiting Planet Kepler-5B 

    Koch, David G.; Borucki, William J.; Rowe, Jason F.; Batalha, Natalie M.; Brown, Timothy M.; Caldwell, Douglas A.; Caldwell, John; Cochran, William D.; DeVore, Edna; Dunham, Edward W.; Dupree, Andrea K.; Gautier, Thomas N., III; Geary, John C.; Gilliland, Ron L.; Howell, Steve B.; Jenkins, Jon M.; Latham, David W.; Lissauer, Jack J.; Marcy, Geoff W.; Morrison, David; Tarter, Jill (2010-04)
    We present 44 days of high duty cycle, ultra precise photometry of the 13th magnitude star Kepler-5 (KIC 8191672, T(eff) = 6300 K, log g = 4.1), which exhibits periodic transits with a depth of 0.7%. Detailed modeling of ...
  • Discovery Of The Ultra-Bright Type II-L Supernova 2008es 

    Gezari, S.; Halpern, J. P.; Grupe, D.; Yuan, F.; Quimby, Robert; McKay, T.; Chamarro, D.; Sisson, M. D.; Akerlof, C.; Wheeler, J. Craig; Brown, Peter J.; Cenko, S. Bradley; Rau, A.; Djordjevic, J. O.; Terndrup, D. M. (2009-01)
    We report the discovery by the Robotic Optical Transient Search Experiment (ROTSE-IIIb) telescope of SN 2008es, an overluminous supernova (SN) at z = 0.205 with a peak visual magnitude of -22.2. We present multiwavelength ...
  • Discovery, observations and theory of over luminous supernovae and peculiar transients 

    Chatzopoulos, Emmanouil (2010-05)
    Modern wide-field imaging transient search projects led to the discovery of a new class of rare, over-luminous stellar explosions. Events like SN 2005ap (Quimby et al. 2007a), SN 2006gy (Quimby 2006; Smith et al. 2007), ...
  • Discovery, Progenitor and Early Evolution of A Stripped Envelope Supernova iPTF13bvn 

    Cao, Yi; Kasliwal, Mansi M.; Arcavi, Iair; Horesh, Assaf; Hancock, Paul; Valenti, Stefano; Cenko, S. Bradley; Kulkarni, S. R.; Gal-Yam, Avishay; Gorbikov, Evgeny; Ofek, Eran O.; Sand, David; Yaron, Ofer; Graham, Melissa; Silverman, Jeffrey M.; Wheeler, J. Craig; Marion, G. H.; Walker, Emma S.; Mazzali, Paolo; Howell, D. Andrew; Li, K. L.; Kong, A. K. H.; Bloom, Joshua S.; Nugent, Peter E.; Surace, Jason; Masci, Frank; Carpenter, John; Degenaar, Nathalie; Gelino, Christopher R. (2013-09)
    The intermediate Palomar Transient Factory reports our discovery of a young supernova, iPTF13bvn, in the nearby galaxy, NGC 5806 (22.5 Mpc). Our spectral sequence in the optical and infrared suggests a Type Ib classification. ...