Now showing items 1-15 of 15

  • CHARA/MIRC observations of two M supergiants in perseus OB1 : temperature, Bayesian modeling, and compressed sensing imaging 

    Baron, F.; Monnier, J.D.; Kiss, L.L.; Neilson, H.R.; Zhao, M.; Anderson, M.; Aarnio, A.; Pedretti, E.; Thureau, N.; Ten Brummelaar, T.A.; Ridgway, S.T.; McAlister, H.A.; Sturmann, J.; Sturmann, L.; Turner, N. (2014-04-10) - Journal article
    Two red supergiants (RSGs) of the Per OB1 association, RS Per and T Per, have been observed in the H band using the Michigan Infra-Red Combiner (MIRC) instrument at the CHARA array. The data show clear evidence of a departure ...
  • Discovery of a magnetic white dwarf with unusual short-period variability 

    Scholz, Aleks; Llama, Joe; Muzic, Koraljka; Faller, Sarah; Froebrich, Dirk; Stelzer, Beate (2018-02-12) - Journal article
    We report the discovery of a magnetic white dwarf which shows periodicvariability with P=110 min, color-dependent amplitudes and a transientphase shift in the blue compared to the red lightcurve - a previouslyunknown type ...
  • Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004 

    Xiang, Y.; Gu, S.-H.; Collier Cameron, A.; Barnes, J.R. (2014-03-01) - Journal article
    We present Doppler images of RS CVn-type binary II Peg based on two data sets obtained in 2004 February and November. In order to improve signal-to-noise ratio and reliability,we apply least-squares deconvolution technique ...
  • Doppler images of the eclipsing binary ER Vulpeculae 

    Xiang, Y.; Gu, S.; Collier Cameron, A.; Barnes, J.R. (2015-02-11) - Journal article
    We present Doppler images of both components of the eclipsing binary system ER Vul, based on the spectra obtained in 2004 November, 2006 September and 2008 November. The least-squares deconvolution technique is used for ...
  • The first Doppler images of the eclipsing binary SZ Piscium 

    Xiang, Yue; Gu, Shenghong; Cameron, Andrew Collier; Barnes, John Robert; Zhang, Liyun (2016-02-11) - Journal article
    We present the first Doppler images of the active eclipsing binary system SZ Psc, based on the high-resolution spectral data sets obtained in 2004 November and 2006 September-December. The least-squares deconvolution ...
  • HII 2407: an eclipsing binary revealed by K2 observations of the Pleiades 

    David, Trevor J.; Stauffer, John; Hillenbrand, Lynne A.; Cody, Ann Marie; Conroy, Kyle; Stassun, Keivan G.; Pope, Benjamin; Aigrain, Suzanne; Gillen, Ed; Collier Cameron, Andrew; Barrado, David; Rebull, L. M.; Isaacson, Howard; Marcy, Geoffrey W.; Zhang, Celia; Riddle, Reed L.; Ziegler, Carl; Law, Nicholas M.; Baranec, Christoph (2015-11-01) - Journal article
    The star HII 2407 is a member of the relatively young Pleiades star cluster and was previously discovered to be a single-lined spectroscopic binary. It is newly identified here within Kepler/K2 photometric time series data ...
  • A Kepler study of starspot lifetimes with respect to light-curve amplitude and spectral type 

    Giles, Helen A. C.; Collier Cameron, Andrew; Haywood, Raphaëlle D. (2017-12-01) - Journal article
    Wide-field high-precision photometric surveys such as Kepler have produced reams of data suitable for investigating stellar magnetic activity of cooler stars. Starspot activity produces quasi-sinusoidal light curves whose ...
  • MOA-2010-BLG-523 : "Failed Planet" = RS CVn Star 

    Gould, A.; Yee, J. C.; Bond, I. A.; Udalski, A.; Han, C.; Jorgensen, U. G.; Greenhill, J.; Tsapras, Y.; Pinsonneault, M. H.; Bensby, T.; Allen, W.; Almeida, L. A.; Bos, M.; Christie, G. W.; DePoy, D. L.; Dong, Subo; Gaudi, B. S.; Hung, L-W; Jablonski, F.; Lee, C-U; McCormick, J.; Moorhouse, D.; Munoz, J. A.; Natusch, T.; Nola, M.; Pogge, R. W.; Skowron, J.; Thornley, G.; Abe, F.; Bennett, D. P.; Botzler, C. S.; Chote, P.; Freeman, M.; Fukui, A.; Furusawa, K.; Harris, P.; Itow, Y.; Ling, C. H.; Masuda, K.; Matsubara, Y.; Miyake, N.; Ohnishi, K.; Rattenbury, N. J.; Saito, To.; Sullivan, D. J.; Sumi, T.; Suzuki, D.; Sweatman, W. L.; Tristram, P. J.; Wada, K.; Yock, P. C. M.; Szymanski, M. K.; Soszynski, I.; Kubiak, M.; Poleski, R.; Ulaczyk, K.; Pietrzynski, G.; Wyrzykowski, L.; Alsubai, K. A.; Bozza, V.; Browne, P.; Burgdorf, M. J.; Calchi Novati, S.; Dodds, P.; Dominik, M.; Finet, F.; Gerner, T.; Hardis, S.; Harpsoe, K.; Hessman, F. V.; Hinse, T. C.; Hundertmark, M.; Kains, N.; Kerins, E.; Liebig, C.; Mancini, L.; Mathiasen, M.; Penny, M. T.; Proft, S.; Rahvar, S.; Ricci, D.; Sahu, K. C.; Scarpetta, G.; Schaefer, S.; Schoenebeck, F.; Snodgrass, C.; Southworth, J.; Surdej, J.; Wambsganss, J.; Street, R. A.; Horne, K.; Bramich, D. M.; Steele, I. A.; Albrow, M. D.; Bachelet, E.; Batista, V.; Beatty, T. G.; Beaulieu, J-P; Bennett, C. S.; Bowens-Rubin, R.; Brillant, S.; Caldwell, J. A. R.; Cassan, A.; Cole, A. A.; Corrales, E.; Coutures, C.; Dieters, S.; Prester, D. Dominis; Donatowicz, J.; Fouque, P.; Henderson, C. B.; Kubas, D.; Marquette, J-B; Martin, R.; Menzies, J. W.; Shappee, B.; Williams, A.; van Saders, J.; Zub, M. (2013-02-01) - Journal article
    The Galactic bulge source MOA-2010-BLG-523S exhibited short-term deviations from a standard microlensing light curve near the peak of an A(max) similar to 265 high-magnification microlensing event. The deviations originally ...
  • Multiple views of magnetism in cool stars 

    Morin, J.; Jardine, Moira Mary; Reiners, A.; Shulyak, D.; Beeck, B.; Hallinan, G.; Hebb, Leslie; Hussain, Gaitee Ara Jaffer; Jeffers, Sandra Victoria; Kochukhov, O.; Vidotto, Aline; Walkowicz, L. (2013-02-01) - Journal article
    Magnetic fields are regarded as a crucial element for our understanding of stellar physics. They can be studied with a variety of methods which provide complementary – and sometimes contradictory – information about the ...
  • Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry 

    Mancini, L.; Ciceri, S.; Chen, G.; Tregloan-Reed, J.; Fortney, J. J.; Southworth, J.; Tan, T. G.; Burgdorf, M.; Calchi Novati, S.; Dominik, Martin; Fang, X.-S.; Finet, F.; Gerner, T.; Hardis, S.; Hinse, T. C.; Jørgensen, U. G.; Liebig, Christine Elisabeth; Nikolov, N.; Ricci, D.; Schäfer, S.; Schönebeck, F.; Skottfelt, J.; Wertz, O.; Alsubai, K. A.; Bozza, V.; Browne, P.; Dodds, Peter; Gu, S.-H.; Harpsøe, K.; Henning, T.; Hundertmark, Markus Peter Gerhard; Jessen-Hansen, J.; Kains, N.; Kerins, E.; Kjeldsen, H.; Lund, M. N.; Lundkvist, M.; Madhusudhan, N.; Mathiasen, M.; Penny, M. T.; Proft, S.; Rahvar, S.; Sahu, K.; Scarpetta, G.; Snodgrass, C.; Surdej, J. (2013-11-21) - Journal article
    We present new ground-based, multi-colour, broad-band photometric measurements of the physical parameters, transmission and emission spectra of the transiting extrasolar planet WASP-19b. The measurements are based on ...
  • Testing the recovery of stellar rotation signals from Kepler light curves using a blind hare-and-hounds exercise 

    Aigrain, S.; Llama, Joe; Ceillier, T.; Chagas, M. L. das; Davenport, J. R. A.; García, R. A.; Hay, K. L.; Lanza, A. F.; McQuillan, A.; Mazeh, T.; de Medeiros, J. R.; Nielsen, M. B.; Reinhold, T. (2015-07-01) - Journal article
    We present the results of a blind exercise to test the recoverability of stellar rotation and differential rotation in Kepler light curves. The simulated light curves lasted 1000 d and included activity cycles,Sun-like ...
  • A transient transit signature associated with the young star RIK-210 

    David, Trevor J.; Petigura, Erik A.; Hillenbrand, Lynne A.; Cody, Ann Marie; Cameron, Andrew Collier; Stauffer, John R.; Fulton, B. J.; Isaacson, Howard T.; Howard, Andrew W.; Howell, Steve B.; Everett, Mark E.; Wang, Ji; Benneke, Björn; Hellier, Coel; West, Richard G.; Pollacco, Don; Anderson, David R. (2017-01-27) - Journal article
    We find transient transit-like dimming events within the K2 time series photometry of the young star RIK-210 in the Upper Scorpius OB association. These dimming events are variable in depth, duration, and morphology. High ...
  • Transiting the Sun : the impact of stellar activity on X-ray and ultraviolet transits 

    Llama, Joe; Shkolnik, E. L. (2015-03-19) - Journal article
    Transits of hot Jupiters in X-rays and the ultraviolet have been shown to be both deeper and more variable than the corresponding optical transits. This variability has been attributed to hot Jupiters having extended ...
  • Transiting the Sun. II. The impact of stellar activity on Lyα transits 

    Llama, J.; Shkolnik, E. L. (2016-01-22) - Journal article
    High-energy observations of the Sun provide an opportunity to test the limits of our ability to accurately measure the properties of transiting exoplanets in the presence of stellar activity. Here we insert the transit of ...
  • Transits and starspots in the WASP-6 planetary system 

    Tregloan-Reed, Jeremy; Southworth, John; Burgdorf, M.; Novati, S. Calchi; Dominik, Martin; Finet, F.; Jørgensen, U. G.; Maier, G.; Mancini, L.; Prof, S.; Ricci, D.; Snodgrass, C.; Bozza, V.; Browne, Paul; Dodds, Peter; Gerner, T.; Harpsøe, K.; Hinse, T. C.; Hundertmark, Markus Peter Gerhard; Kains, Noé; Kerins, E.; Liebig, Christine Elisabeth; Penny, M. T.; Rahvar, S.; Sahu, K.; Scarpetta, G.; Schäfer, S.; Schönebeck, F.; Skottfelt, J.; Surdej, J. (2015-06-21) - Journal article
    We present updates to prism, a photometric transit-starspot model, and GEMC, a hybrid optimization code combining MCMC and a genetic algorithm. We then present high-precision photometry of four transits in the WASP-6 ...