Now showing items 1-14 of 14

    • A terrestrial planet candidate in a temperate orbit around Proxima Centauri 

      Anglada Escudé, Guillem; Amado, Pedro J.; Barnes, John; Berdinas, Zaira M.; Butler, R. Paul; Coleman, Gavin A. L.; Cueva, Ignacio de la; Dreizler, Stefan; Endl, Michael; Giesers, Benjamin; Jeffers, Sandra V.; Jenkins, James Stewart; Jones, Hugh R. A.; Kiraga, Marcin; Kuerster, Martin; López González, María J.; Marvin, Christopher J.; Morales, Nicolás; Morín, Julien; Nelson, Richard P.; Ortiz, José L.; Ofir, Aviv; Paardekooper, Sijme-Jam; Reiners, Ansgar; Rodríguez, Eloy; Rodríguez López, Cristina; Sarmiento, Luis F.; Strachan, John P.; Tsapras, Yiannis; Tuomi, Mikko; Zechmeister, Mathias (Nature, 2016)
      At a distance of 1.295 parsecs(1), the red dwarf Proxima Centauri (a Centauri C, GL 551, HIP 70890 or simply Proxima) is the Sun's closest stellar neighbour and one of the best-studied low-mass stars. It has an effective ...
    • A wide-angle outflow with the simultaneous presence of a high-velocity jet in the high-mass Cepheus A HW2 system 

      Torrelles, J. M.; Patel, N. A.; Curiel, S.; Estalella, R.; Gómez, J. F.; Rodríguez, L. F.; Cantó, J.; Anglada Escudé, Guillem; Vlemmings, W.; Garay Brignardello, Guido; Raga, A. C.; Ho, P. T. P. (2011)
      We present five epochs of VLBI water maser observations around the massive protostar Cepheus A HW2 with 0.4 mas (0.3 au) resolution. The main goal of these observations was to follow the evolution of the remarkable water ...
    • Analysis of combined radial velocities and activity of BD+20 1790: evidence supporting the existence of a planetary companion 

      Hernán Obispo, M.; Tuomi, M.; Gálvez Ortiz, M. C.; Golovin, A.; Barnes, J. R.; Jones, H. R. A.; Kane, S. R.; Pinfield, D.; Jenkins, James Stewart; Petit, P.; Anglada Escudé, Guillem; Marsden, S. C.; Catalán, S.; Jeffers, S. V.; Castro, E. de; Cornide, M.; Garcés, A.; Jones, M. I.; Gorlova, N.; Andreev, M. (EDP Sciences, 2015)
      Context. In a previous paper we reported a planetary companion to the young and very active K5Ve star BD+20 1790. We found that this star has a high level of stellar activity (log R HK = −3.7) that manifests in a plethora ...
    • Bayesian search for low-mass planets around nearby M dwarfs – estimates for occurrence rate based on global detectability statistics 

      Tuomi, Mikko; Jones, Hugh R. A.; Barnes, John R.; Anglada Escudé, Guillem; Jenkins, James Stewart (Oxford University Press, 2014)
      Due to their higher planet–star mass ratios, M dwarfs are the easiest targets for detection of low-mass planets orbiting nearby stars using Doppler spectroscopy. Furthermore, because of their low masses and luminosities, ...
    • Detection of a candidate for the exciting source of the expanding water maser bubble in Cepheus A 

      Curiel, Salvador; Trinidad, Miguel A.; Cantó, Jorge; Rodríguez, Luis F.; Torrelles, José M.; Ho, Paul T. P.; Patel, Nimesh A.; Greenhill, Lincoln; Gómez, José F.; Garay Brignardello, Guido; Hernández, Liliana; Contreras, María E.; Anglada Escudé, Guillem (2002-06-01)
      We report sensitive, high angular resolution VLA 3.6 cm and 7 mm continuum observations toward the starforming region Cepheus A. Three embedded young stellar objects (YSOs) were found within a projected area of 0 .6#0 ...
    • A dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zone 

      Anglada Escudé, Guillem; Tuomi, Mikko; Gerlach, Enrico; Barnes, Rory; Heller, René; Jenkins, James Stewart; Wende, Sebastian; Vogt, Steven S.; Butler, R. Paul; Reiners, Ansgar; Jones, Hugh R. A. (EDP Sciences, 2013-08)
      Context. Since low-mass stars have low luminosities, orbits at which liquid water can exist on Earth-sized planets are relatively close-in, which produces Doppler signals that are detectable using state-of-the-art Doppler ...
    • Evidence for evolution of the outflow collimation in very young stellar objects 

      Torrelles, J. M.; Patel, N. A.; Anglada Escudé, Guillem; Gómez, J. F.; Ho, P. T. P.; Lara, L.; Alberdi, A.; Cantó, J.; Curiel, S.; Garay Brignardello, Guido; Rodríguez, L. F. (2003-12-01)
      We present Very Long Baseline Array proper-motion measurements of water masers toward two young stellar objects (YSOs) of the W75 N star-forming region. We find that these two objects are remarkable for having a similar ...
    • GJ 832c: a super-earth in the habitable zone 

      Wittenmyer, Robert A.; Tuomi, Mikko; Butler, R. P.; Jones, H. R.; Anglada Escudé, Guillem; Horner, Jonathan; Tinney, C. G.; Marshall, J. P.; Carter, B. D.; Bailey, J.; Salter, G. S.; O’Toole, S. J.; Wright, D.; Crane, J. D.; Schectman, S. A.; Arriagada, P.; Thompson, I.; Minniti, D.; Jenkins, James Stewart; Diaz, M. (The American Astronomical Society., 2014)
      We report the detection of GJ 832c, a super-Earth orbiting near the inner edge of the habitable zone of GJ 832, an Mdwarf previously known to host a Jupiter analog in a nearly circular 9.4 yr orbit. The combination of ...
    • MagAO Imaging of long-period Objects (MILO). I. A Benchmark M Dwarf Companion Exciting a Massive Planet around the Sun-like star HD 7449 

      Rodigas, Timothy; Arriagada, Pamela; Faherty, Jackie; Anglada Escudé, Guillem; Kaib, Nathan; Butler, R. Paul; Shectman, Stephen; Weinberger, Alycia; Males, Jared; Morzinski, Katie; Close, Laird; Hinz, Philip; Crane, Jeffrey; Thompson, Ian; Teske, Johanna; Díaz, Matías; Minniti, Dante; López Morales, Mercedes; Adams, Adam; Boss, Alan (IOP, 2016)
      We present high-contrast Magellan adaptive optics images of HD 7449, a Sun-like star with one planet and a longterm radial velocity (RV) trend. We unambiguously detect the source of the long-term trend from 0.6–2.15 μmat ...
    • MagAO imaging of long-period objects (MILO). II. A puzzling white dwarfaround the sun-like star HD 11112 

      Rodigas, Timothy J.; Bergeron, P.; Simon, Amélie; Arriagada, Pamela; Faherty, Jacqueline K.; Anglada Escudé, Guillem; Mamajek, Eric E.; Weinberger, Alycia; Butler, R. Paul; Males, Jared R.; Morzinski, Katie; Close, Laird M.; Hinz, Philip M.; Bailey, Jeremy; Carter, Brad; Jenkins, James Stewart; Jones, Hugh; O’Toole, Simon; Tinney, C. G.; Wittenmyer, Rob; Debes, John (IOP Publishing, 2016)
      HD 11112 is an old, Sun-like star that has a long-term radial velocity (RV) trend indicative of a massive companion on a wide orbit. Here we present direct images of the source responsible for the trend using the Magellan ...
    • A MULTI-WAVELENGTH STUDY OF THE STAR-FORMING CORE AHEAD OF HH 80N 

      Masqué, Josep M.; Osorio, Mayra; Girart, Josep M.; Anglada Escudé, Guillem; Garay Brignardello, Guido; Estalella, Robert; Calvet, Nuria; Beltrán, María T. (IOP PUBLISHING LTD, TEMPLE CIRCUS,, 2011-09-01)
      We present observations of continuum emission in the mid-infrared to millimeter wavelength range, complemented with ammonia observations, of the dense core ahead of the radio Herbig–Haro (HH) object HH 80N, found in ...
    • Multifrequency VLA observations of radio continuum from IRAS 16293-2422 

      Estalella, R.; Anglada Escudé, Guillem; Rodríguez, L. F.; Garay Brignardello, Guido (1991-04-20)
      Using the VLA at 20, 6, 2, and 1.3 cm, we observed the cold infrared source IRAS 16293-2422. Our data allow a determination of the spectral indices of the components A and B. IRAS 16293-2422A, which is known from higher ...
    • Precision radial velocities of 15 M5–M9 dwarfs 

      Barnes, J. R.; Jenkins, James Stewart; Jones, H.R.A.; Jeffers, S. V.; Rojo Rubke, Patricio; Arriagada, P.; Jordán, A.; Minniti, D.; Tuomi, M.; Pinfield, D. J.; Anglada Escudé, Guillem (Royal Astronomical Society, 2014-02-20)
      We present radial velocity measurements of a sample of M5V–M9V stars from our Red-Optical Planet Survey, operating at 0.652–1.025 µm. Radial velocities for 15 stars, with rms precision down to 2.5 m s−1 over a week-long ...
    • Spherical episodic ejection of material from a young star 

      Torrelles, J. M.; Patel, N. A.; Gómez, J. F.; Ho, P. T. P.; Rodríguez, L. F.; Anglada Escudé, Guillem; Garay Brignardello, Guido; Greenhill, L.; Curiel, S.; Cantó, J. (2001-05-17)
      The exact processes by which interstellar matter condenses to formyoung stars are of great interest, in part because they bear on the formation of planets like our own from the material that fails to become part of the ...