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Full-Text Articles in Physical Sciences and Mathematics
Constraints On A Second Planet In The Wasp-3 System, G. Maciejewski, A. Niedzielski, A. Wolszczan, G. Nowak, R. Neuhäuser, J. N. Winn, B. Deka, M. Adamów, M. Górecka, M. Fernández, F. J. Aceituno, J. Ohlert, R. Errmann, M. Seeliger, D. P. Dimitrov, D. W. Latham, G. A. Esquerdo, L. Mcknight, M. J. Holman, Eric L.N. Jensen, U. Kramm, T. Pribulla, S. Raetz, T. O.B. Schmidt, C. Ginski, S. Mottola, S. Hellmich, C. Adam, H. Gilbert, M. Mugrauer, G. Saral, V. Popov, M. Raetz
Constraints On A Second Planet In The Wasp-3 System, G. Maciejewski, A. Niedzielski, A. Wolszczan, G. Nowak, R. Neuhäuser, J. N. Winn, B. Deka, M. Adamów, M. Górecka, M. Fernández, F. J. Aceituno, J. Ohlert, R. Errmann, M. Seeliger, D. P. Dimitrov, D. W. Latham, G. A. Esquerdo, L. Mcknight, M. J. Holman, Eric L.N. Jensen, U. Kramm, T. Pribulla, S. Raetz, T. O.B. Schmidt, C. Ginski, S. Mottola, S. Hellmich, C. Adam, H. Gilbert, M. Mugrauer, G. Saral, V. Popov, M. Raetz
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There have been previous hints that the transiting planet WASP-3b is accompanied by a second planet in a nearby orbit, based on small deviations from strict periodicity of the observed transits. Here we present 17 precise radial velocity (RV) measurements and 32 transit light curves that were acquired between 2009 and 2011. These data were used to refine the parameters of the host star and transiting planet. This has resulted in reduced uncertainties for the radii and masses of the star and planet. The RV data and the transit times show no evidence for an additional planet in the system. …
Kelt-3b: A Hot Jupiter Transiting A V=9.8 Late-F Star, J. Pepper, R. J. Siverd, T. G. Beatty, B. S. Gaudi, K. G. Stassun, J. D. Eastman, K. Collins, D. W. Latham, A. Bieryla, L. A. Buchhave, Eric L.N. Jensen, M. Manner, K. Penev, J. R. Crepp, P. A. Cargile, Saurav Dhital , '06, M. L. Calkins, G. A. Esquerdo, P. Berlind, B. J. Fulton, R. Street, B. Ma, J. Ge, J. Wang, Q. Mao, A. J.W. Richert, A. Gould, D. L. Depoy, J. F. Kielkopf, J. L. Marshall, R. W. Pogge, R. P. Stefanik, M. Trueblood, P. Trueblood
Kelt-3b: A Hot Jupiter Transiting A V=9.8 Late-F Star, J. Pepper, R. J. Siverd, T. G. Beatty, B. S. Gaudi, K. G. Stassun, J. D. Eastman, K. Collins, D. W. Latham, A. Bieryla, L. A. Buchhave, Eric L.N. Jensen, M. Manner, K. Penev, J. R. Crepp, P. A. Cargile, Saurav Dhital , '06, M. L. Calkins, G. A. Esquerdo, P. Berlind, B. J. Fulton, R. Street, B. Ma, J. Ge, J. Wang, Q. Mao, A. J.W. Richert, A. Gould, D. L. Depoy, J. F. Kielkopf, J. L. Marshall, R. W. Pogge, R. P. Stefanik, M. Trueblood, P. Trueblood
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We report the discovery of KELT-3b, a moderately inflated transiting hot Jupiter with a mass of 1.477(-0.067)(+0.066) M-J, radius of 1.345 +/- 0.072 R-J, and an orbital period of 2.7033904 +/- 0.000010 days. The host star, KELT-3, is a V = 9.8 late F star with M-* = 1.278(-0.061)(+0.063) M-circle dot, R-* = 1.472(-0.067)(+0.065) R-circle dot, T-eff = 6306(-49)(+50) K, log(g) = 4.209(-0.031)(+0.033), and [Fe/H] = 0.044(-0.082)(+0.080), and has a likely proper motion companion. KELT-3b is the third transiting exoplanet discovered by the KELT survey, and is orbiting one of the 20 brightest known transiting planet host stars, making it …
Wind Channeling, Magnetospheres, And Spindown Of Magnetic Massive Stars, S. P. Owocki, A. Ud-Doula, R. H. D. Townsend, V. Petit, J. O. Sundqvist, David H. Cohen
Wind Channeling, Magnetospheres, And Spindown Of Magnetic Massive Stars, S. P. Owocki, A. Ud-Doula, R. H. D. Townsend, V. Petit, J. O. Sundqvist, David H. Cohen
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A subpopulation (~10%) of hot, luminous, massive stars have been revealed through spectropolarimetry to harbor strong (hundreds to tens of thousand Gauss), steady, large-scale (often significantly dipolar) magnetic fields. This review focuses on the role of such fields in channeling and trapping the radiatively driven wind of massive stars, including both in the strongly perturbed outflow from open field regions, and the wind-fed “magnetospheres” that develop from closed magnetic loops. For B-type stars with weak winds and moderately fast rotation, one finds “centrifugal magnetospheres”, in which rotational support allows magnetically trapped wind to accumulate to a large density, with quite …
The Stellar Content Of The Young Open Cluster Trumpler 37, R. Errmann, R. Neuhäuser, L. Marschall, G. Torres, M. Mugrauer, W. P. Chen, S. C.-L. Hu, C. Briceño, R. Chini, L. Bukowiecki, D. P. Dimitrov, D. P. Kjurkchieva, Eric L.N. Jensen, David H. Cohen, Z.-Y. Wu, T. Pribulla, M. Vaňko, V. Krushevska, J. Budaj, Y. Oasa, A. K. Pandey, M. Fernández, A. Kellerer, C. Marka
The Stellar Content Of The Young Open Cluster Trumpler 37, R. Errmann, R. Neuhäuser, L. Marschall, G. Torres, M. Mugrauer, W. P. Chen, S. C.-L. Hu, C. Briceño, R. Chini, L. Bukowiecki, D. P. Dimitrov, D. P. Kjurkchieva, Eric L.N. Jensen, David H. Cohen, Z.-Y. Wu, T. Pribulla, M. Vaňko, V. Krushevska, J. Budaj, Y. Oasa, A. K. Pandey, M. Fernández, A. Kellerer, C. Marka
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With an apparent cluster diameter of 1.5 degrees and an age of 4 Myr, Trumpler 37 is an ideal target for photometric monitoring of young stars as well as for the search of planetary transits, eclipsing binaries and other sources of variability. The YETI consortium has monitored Trumpler 37 throughout 2010 and 2011 to obtain a comprehensive view of variable phenomena in this region. In this first paper we present the cluster properties and membership determination as derived from an extensive investigation of the literature. We also compared the coordinate list to some YETI images. For 1872 stars we found …
Constraints On Porosity And Mass Loss In O-Star Winds From The Modeling Of X-Ray Emission Line Profile Shapes, M. A. Leutenegger, David H. Cohen, J. O. Sundqvist, S. P. Owocki
Constraints On Porosity And Mass Loss In O-Star Winds From The Modeling Of X-Ray Emission Line Profile Shapes, M. A. Leutenegger, David H. Cohen, J. O. Sundqvist, S. P. Owocki
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We fit X-ray emission line profiles in high resolution XMM-Newton and Chandra grating spectra of the early O supergiant zeta Pup with models that include the effects of porosity in the stellar wind. We explore the effects of porosity due to both spherical and flattened clumps. We find that porosity models with flattened clumps oriented parallel to the photosphere provide poor fits to observed line shapes. However, porosity models with isotropic clumps can provide acceptable fits to observed line shapes, but only if the porosity effect is moderate. We quantify the degeneracy between porosity effects from isotropic clumps and the …
Improved Orbital Parameters And Transit Monitoring For Hd 156846b, S. R. Kane, A. W. Howard, G. Pilyavsky, S. Mahadevan, G. W. Henry, K. Von Braun, D. R. Ciardi, D. Dragomir, D. A. Fischer, Eric L.N. Jensen, G. Laughlin, S. V. Ramirez, J. T. Wright
Improved Orbital Parameters And Transit Monitoring For Hd 156846b, S. R. Kane, A. W. Howard, G. Pilyavsky, S. Mahadevan, G. W. Henry, K. Von Braun, D. R. Ciardi, D. Dragomir, D. A. Fischer, Eric L.N. Jensen, G. Laughlin, S. V. Ramirez, J. T. Wright
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HD 156846b is a Jovian planet in a highly eccentric orbit (e = 0.85) with a period of 359.55 days. The pericenter passage at a distance of 0.16 AU is nearly aligned to our line of sight, offering an enhanced transit probability of 5.4% and a potentially rich probe of the dynamics of a cool planetary atmosphere impulsively heated during close approach to a bright star (V = 6.5). We present new radial velocity (RV) and photometric measurements of this star as part of the Transit Ephemeris Refinement and Monitoring Survey. The RV measurements from the Keck-High Resolution Echelle Spectrometer …
Host Star Properties And Transit Exclusion For The Hd 38529 Planetary System, G. W. Henry, S. R. Kane, S. X. Wang, T. S. Boyajian, K. Von Braun, D. R. Ciardi, D. Dragomir, C. Farrington, D. A. Fischer, N. R. Hinkel, A. W. Howard, Eric L.N. Jensen, G. Laughlin, S. Mahadevan, G. Pilyavsky
Host Star Properties And Transit Exclusion For The Hd 38529 Planetary System, G. W. Henry, S. R. Kane, S. X. Wang, T. S. Boyajian, K. Von Braun, D. R. Ciardi, D. Dragomir, C. Farrington, D. A. Fischer, N. R. Hinkel, A. W. Howard, Eric L.N. Jensen, G. Laughlin, S. Mahadevan, G. Pilyavsky
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The transit signature of exoplanets provides an avenue through which characterization of exoplanetary properties may be undertaken, such as studies of mean density, structure, and atmospheric composition. The Transit Ephemeris Refinement and Monitoring Survey is a program to expand the catalog of transiting planets around bright host stars by refining the orbits of known planets discovered with the radial velocity technique. Here we present results for the HD 38529 system. We determine fundamental properties of the host star through direct interferometric measurements of the radius and through spectroscopic analysis. We provide new radial velocity measurements that are used to improve …
Thin-Shell Mixing In Radiative Wind-Shocks And The L-X Similar To L-Bol Scaling Of O-Star X-Rays, S. P. Owocki, J. O. Sundqvist, David H. Cohen, K. G. Gayley
Thin-Shell Mixing In Radiative Wind-Shocks And The L-X Similar To L-Bol Scaling Of O-Star X-Rays, S. P. Owocki, J. O. Sundqvist, David H. Cohen, K. G. Gayley
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X-ray satellites since Einstein have empirically established that the X-ray luminosity from single O-stars scales linearly with bolometric luminosity, L-x similar to 10(-7)L(bol). But straightforward forms of the most favoured model, in which X-rays arise from instability-generated shocks embedded in the stellar wind, predict a steeper scaling, either with mass-loss rate L-x similar to(M)over dot similar to L-bol(1.7) if the shocks are radiative or with L-x similar to (M)over dot(2) similar to L-bol(3.4) if they are adiabatic. This paper presents a generalized formalism that bridges these radiative versus adiabatic limits in terms of the ratio of the shock cooling length …
A Magnetic Confinement Versus Rotation Classification Of Massive-Star Magnetospheres, V. Petit, S. P. Owocki, G. A. Wade, David H. Cohen, J. O. Sundqvist, M. Gagné, J. Maíz Apellániz, M. E. Oksala, D. A. Bohlender, T. Rivinius, H. F. Henrichs, E. Alecian, R. H.D. Townsend, A. Ud-Doula
A Magnetic Confinement Versus Rotation Classification Of Massive-Star Magnetospheres, V. Petit, S. P. Owocki, G. A. Wade, David H. Cohen, J. O. Sundqvist, M. Gagné, J. Maíz Apellániz, M. E. Oksala, D. A. Bohlender, T. Rivinius, H. F. Henrichs, E. Alecian, R. H.D. Townsend, A. Ud-Doula
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Building on results from the Magnetism in Massive Stars (MiMeS) project, this paper shows how a two-parameter classification of massive-star magnetospheres in terms of the magnetic wind confinement (which sets the Alfvén radius RA) and stellar rotation (which sets the Kepler co-rotation radius RK) provides a useful organization of both observational signatures and theoretical predictions. We compile the first comprehensive study of inferred and observed values for relevant stellar and magnetic parameters of 64 confirmed magnetic OB stars with Teff ≳ 16 kK. Using these parameters, we locate the stars in the magnetic confinement–rotation diagram, a log–log plot of RK …
Discovery Of A Magnetic Field In The Rapidly Rotating O-Type Secondary Of The Colliding-Wind Binary Hd 47129 (Plaskett's Star), J. H. Grunhut, G. A. Wade, M. A. Leutenegger, V. Petit, G. Rauw, C. Neiner, F. Martins, David H. Cohen, M. Gagné, R. Ignace, S. Mathis, S. E. De Mink, A. F.J. Moffat, S. P. Owocki, M. Shultz, J. O. Sundqvist
Discovery Of A Magnetic Field In The Rapidly Rotating O-Type Secondary Of The Colliding-Wind Binary Hd 47129 (Plaskett's Star), J. H. Grunhut, G. A. Wade, M. A. Leutenegger, V. Petit, G. Rauw, C. Neiner, F. Martins, David H. Cohen, M. Gagné, R. Ignace, S. Mathis, S. E. De Mink, A. F.J. Moffat, S. P. Owocki, M. Shultz, J. O. Sundqvist
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We report the detection of a strong, organized magnetic field in the secondary component of the massive O8III/I+O7.5V/III double-lined spectroscopic binary system HD 47129 (Plaskett's star) in the context of the Magnetism in Massive Stars survey. Eight independent Stokes V observations were acquired using the Echelle SpectroPolarimetric Device for the Observations of Stars (ESPaDOnS) spectropolarimeter at the Canada-France-Hawaii Telescope and the Narval spectropolarimeter at the Telescope Bernard Lyot. Using least-squares deconvolution we obtain definite detections of signal in Stokes V in three observations. No significant signal is detected in the diagnostic null (N) spectra. The Zeeman signatures are broad and …