Physical Sciences and Mathematics | Open Access Articles

The Architecture Of The Gw Ori Young Triple-Star System And Its Disk: Dynamical Masses, Mutual Inclinations, And Recurrent Eclipses, I. Czekala, S. M. Andrews, G. Torres, J. E. Rodriguez, Eric L.N. Jensen, K. G. Stassun, D. W. Latham, D. J. Wilner, M. A. Gully-Santiago, K. N. Grankin, M. B. Lund, R. B. Kuhn, D. J. Stevens, R. J. Siverd, D. James, B. S. Gaudi, B. J. Shappee, T. W.-S. Holoien

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We present spatially and spectrally resolved Atacama Large Millimeter/submillimeter Array (ALMA) observations of gas and dust orbiting the pre-main-sequence hierarchical triple-star system GW Ori. A forward modeling of the ¹³CO and C¹⁸O J = 2–1 transitions permits a measurement of the total stellar mass in this system, 5.29 ± 0.09 M_⊙, and the circumtriple disk inclination, 137 fdg 6 ± 2 fdg 0. Optical spectra spanning a 35 yr period were used to derive new radial velocities and, coupled with a spectroscopic disentangling technique, revealed that the A and B components of GW Ori form a …

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Kelt-20b: A Giant Planet With A Period Of P ~ 3.5 Days Transiting The V ~ 7.6 Early A Star Hd 185603, M. B. Lund, J. E. Rodriguez, G. Zhou, B. S. Gaudi, K. G. Stassun, M. C. Johnson, A. Bieryla, R. J. Oelkers, D. J. Stevens, K. A. Collins, K. Penev, S. N. Quinn, D. W. Latham, S. Villanueva Jr., J. D. Eastman, J. F. Kielkopf, T. E. Oberst, Eric L.N. Jensen, David H. Cohen, M. D. Joner, D. C. Stephens, H. Relles, G. Corfini, J. Gregorio, R. Zambelli, G. A. Esquerdo, M. L. Calkins, P. Berlind, D. R. Ciardi, C. Dressing, R. Patel, P. Gagnon, E. Gonzales, T. G. Beatty, R. J. Siverd, J. Labadie-Bartz, R. B. Kuhn, K. D. Colón, D. James, J. Pepper, B. J. Fulton, K. K. Mcleod, C. Stockdale, S. Calchi Novati, D. L. Depoy, A. Gould, J. L. Marshall, M. Trueblood, P. Trueblood, J. A. Johnson, J. Wright, N. Mccrady, R. A. Wittenmyer, S. A. Johnson, A. Sergi, M. Wilson, D. H. Sliski

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We report the discovery of KELT-20b, a hot Jupiter transiting a early A star, HD 185603, with an orbital period of days. Archival and follow-up photometry, Gaia parallax, radial velocities, Doppler tomography, and AO imaging were used to confirm the planetary nature of KELT-20b and characterize the system. From global modeling we infer that KELT-20 is a rapidly rotating ( ) A2V star with an effective temperature of K, mass of , radius of , surface gravity of , and age of . The planetary companion has a radius of , a semimajor axis of au, and a linear ephemeris …

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A Bright Short Period M-M Eclipsing Binary From The Kelt Survey: Magnetic Activity And The Mass–Radius Relationship For M Dwarfs, J. B. Lubin, J. E. Rodriguez, G. Zhou, K. E. Conroy, K. G. Stassun, K. Collins, D. J. Stevens, J. Labadie-Bartz, C. Stockdale, G. Myers, K. D. Colón, J. Bento, P. Kehusmaa, R. Petrucci, E. Jofré, S. N. Quinn, M. B. Lund, R. B. Kuhn, R. J. Siverd, T. G. Beatty, C. Harlingten, J. Pepper, B. S. Gaudi, D. James, Eric L.N. Jensen, D. Reichart, L. Kedziora-Chudczer, J. Bailey, G. Melville

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We report the discovery of KELT J041621-620046, a moderately bright (J ~ 10.2) M-dwarf eclipsing binary system at a distance of 39 ± 3 pc. KELT J041621-620046 was first identified as an eclipsing binary using observations from the Kilodegree Extremely Little Telescope (KELT) survey. The system has a short orbital period of ~1.11 days and consists of components with and in nearly circular orbits. The radii of the two stars are and . Full system and orbital properties were determined (to ∼10% error) by conducting an EBOP (Eclipsing Binary Orbit Program) global modeling of the high precision photometric and spectroscopic …

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A Giant Planet Undergoing Extreme-Ultraviolet Irradiation By Its Hot Massive-Star Host, B. S. Gaudi, K. G. Stassun, K. A. Collins, T. G. Beatty, G. Zhou, D. W. Latham, A. Bieryla, J. D. Eastman, R. J. Siverd, J. R. Crepp, E. J. Gonzales, D. J. Stevens, L. A. Buchhave, J. Pepper, M. C. Johnson, K. D. Colón, Eric L.N. Jensen, J. E. Rodriguez, V. Bozza, S. C. Novati, G. D’Ago, M. T. Dumont, T. Ellis, C. Gaillard, H. Jang-Condell, D. H. Kasper, A. Fukui, J. Gregorio, A. Ito, J. F. Kielkopf, M. Manner, K. Matt, N. Narita, T. E. Oberst, P. A. Reed, G. Scarpetta, D. C. Stephens, R. R. Yeigh, R. Zambelli, B. J. Fulton, A. W. Howard, D. J. James, M. Penny, D. Bayliss, I. A. Curtis, D. L. Depoy, G. A. Esquerdo, A. Gould, M. D. Joner, R. B. Kuhn, J. Labadie-Bartz, M. B. Lund, J. L. Marshall, K. K. Mcleod, R. W. Pogge, H. Relles, C. Stockdale, T. G. Tan, M. Trueblood, P. Trueblood

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The amount of ultraviolet irradiation and ablation experienced by a planet depends strongly on the temperature of its host star. Of the thousands of extrasolar planets now known, only six have been found that transit hot, A-type stars (with temperatures of 7,300–10,000 kelvin), and no planets are known to transit the even hotter B-type stars. For example, WASP-33 is an A-type star with a temperature of about 7,430 kelvin, which hosts the hottest known transiting planet, WASP-33b (ref. 1); the planet is itself as hot as a red dwarf star of type M (ref. 2). WASP-33b displays a large heat …

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Kelt-18b: Puffy Planet, Hot Host, Probably Perturbed, K. K. Mcleod, J. E. Rodriguez, R. J. Oelkers, K. A. Collins, A. Bieryla, B. J. Fulton, K. G. Stassun, B. S. Gaudi, K. Penev, D. J. Stevens, K. D. Colón, J. Pepper, N. Narita, R. Tsuguru, A. Fukui, P. A. Reed, B. Tirrell, T. Visgaitis, J. F. Kielkopf, David H. Cohen, Eric L.N. Jensen, J. Gregorio, Ö. Baştürk, T. E. Oberst, C. Melton, E. M.-R. Kempton, A. Baldrige, Y. S. Zhao, R. Zambelli, D. W. Latham, G. A. Esquerdo, P. Berlind, M. L. Calkins, A. W. Howard, H. Isaacson, L. M. Weiss, P. Benni, T. G. Beatty, J. D. Eastman, M. T. Penny, R. J. Siverd, M. B. Lund, J. Labadie-Bartz, G. Zhou, I. A. Curtis, M. D. Joner, M. Manner, H. Relles, G. Scarpetta, D. C. Stephens, C. Stockdale, T. G. Tan, D. L. Depoy, J. L. Marshall, R. W. Pogge, M. Trueblood, P. Trueblood

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We report the discovery of KELT-18b, a transiting hot Jupiter in a 2.87-day orbit around the bright ( V = 10.1), hot, F4V star BD+60 1538 (TYC 3865-1173-1). We present follow-up photometry, spectroscopy, and adaptive optics imaging that allow a detailed characterization of the system. Our preferred model fits yield a host stellar temperature of K and a mass of , situating it as one of only a handful of known transiting planets with hosts that are as hot, massive, and bright. The planet has a mass of , a radius of , and a density of , making it …

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Kelt-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting The V = 8 Subgiant Hd 93396, J. Pepper, J. E. Rodriguez, K. A. Collins, J. A. Johnson, B. J. Fulton, A. W. Howard, T. G. Beatty, K. G. Stassun, H. Isaacson, K. D. Colón, M. B. Lund, R. B. Kuhn, R. J. Siverd, B. S. Gaudi, T. G. Tan, I. Curtis, C. Stockdale, D. Mawet, M. Bottom, D. James, G. Zhou, D. Bayliss, P. Cargile, A. Bieryla, K. Penev, D. W. Latham, J. Labadie-Bartz, J. Kielkopf, J. D. Eastman, T. E. Oberst, Eric L.N. Jensen, P. Nelson, D. H. Sliski, R. A. Wittenmyer, N. Mccrady, J. T. Wright, H. M. Relles, D. J. Stevens, M. D. Joner, E. Hintz

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We report the discovery of a transiting exoplanet, KELT-11b, orbiting the bright (V = 8.0) subgiant HD 93396. A global analysis of the system shows that the host star is an evolved subgiant star with T_eff = 5370 ± 51 K, M_* = 1.438 (+0.061)/(-0.052) M_⊙, R_* = 2.72 (+0.21)/(-0.17) R_⊙, logg_* = 3.727 (+0.040)/(-0.046), and [Fe/H] = 0.180 ± 0.075. The planet is a low-mass gas giant in a P = 4.736529 ± 0.00006 day orbit, with M_P = 0.195 ± 0.018 M_J, R_P = …

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Kelt-12b: A P ~ 5 Day, Highly Inflated Hot Jupiter Transiting A Mildly Evolved Hot Star, D. J. Stevens, K. A. Collins, B. S. Gaudi, T. G. Beatty, R. J. Siverd, A. Bieryla, B. J. Fulton, J. R. Crepp, E. J. Gonzales, C. T. Coker, K. Penev, K. G. Stassun, Eric L.N. Jensen, A. W. Howard, D. W. Latham, J. E. Rodriguez, R. Zambelli, V. Bozza, P. A. Reed, J. Gregorio, L. A. Buchhave, M. T. Penny, J. Pepper, P. Berlind, S. Calchi Novati, M. L. Calkins, G. D'Ago, J. D. Eastman, D. Bayliss, K. D. Colón, I. A. Curtis, D. L. Depoy, G. A. Esquerdo, A. Gould, M. D. Joner, J. F. Kielkopf, J. Labadie-Bartz, M. B. Lund, M. Manner, J. L. Marshall, K. K. Mcleod, T. E. Oberst, R. W. Pogge, G. Scarpetta, D. C. Stephens, C. Stockdale, T. G. Tan, M. Trueblood, P. Trueblood

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We announce the discovery of KELT-12b, a highly inflated Jupiter-mass planet transiting the mildly evolved, V = 10.64 host star TYC 2619-1057-1. We followed up the initial transit signal in the KELT-North survey data with precise ground-based photometry, high-resolution spectroscopy, precise radial velocity measurements, and high-resolution adaptive optics imaging. Our preferred best-fit model indicates that the host star has = 6279 ± 51 K, = 3.89 ± 0.05,[Fe/H] = , = , and = 2.37 ± 0.17 . The planetary companion has = 0.95 ± 0.14 , = , = , and density = g cm −3 , making it …

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Magnetic Massive Stars As Progenitors Of ‘Heavy’ Stellar-Mass Black Holes, V. Petit, Z. Keszthelyi, R. Macinnis, David H. Cohen, R. H. D. Townsend, G. A. Wade, S. L. Thomas, S. P. Owocki, J. Puls, A. Ud-Doula

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The groundbreaking detection of gravitational waves produced by the inspiralling and coalescence of the black hole (BH) binary GW150914 confirms the existence of ‘heavy’ stellar-mass BHs with masses >25 M⊙. Initial characterization of the system by Abbott et al. supposes that the formation of BHs with such large masses from the evolution of single massive stars is only feasible if the wind mass-loss rates of the progenitors were greatly reduced relative to the mass-loss rates of massive stars in the Galaxy, concluding that heavy BHs must form in low-metallicity (Z ≲ 0.25-0.5 Z⊙) environments. However, strong surface magnetic fields also …

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Kelt-16b: A Highly Irradiated, Ultra-Short Period Hot Jupiter Nearing Tidal Disruption, T. E. Oberst, J. E. Rodriguez, K. D. Colón, D. Angerhausen, A. Bieryla, H. Ngo, D. J. Stevens, K. G. Stassun, B. S. Gaudi, J. Pepper, K. Penev, D. Mawet, D. W. Latham, T. M. Heintz, B. W. Osei, K. A. Collins, J. F. Kielkopf, T. Visgaitis, P. A. Reed, A. Escamilla, S. Yazdi, K. K. Mcleod, L. T. Lunsford, M. Spencer, M. D. Joner, J. Gregorio, C. Gaillard, K. Matt, M. T. Dumont, D. C. Stephens, David H. Cohen, Eric L.N. Jensen, S. C. Novati, V. Bozza, J. Labadie-Bartz, R. J. Siverd, M. B. Lund, T. G. Beatty, J. D. Eastman, M. T. Penny, M. Manner, R. Zambelli, B. J. Fulton, C. Stockdale, D. L. Depoy, J. L. Marshall, R. W. Pogge, A. Gould, M. Trueblood, P. Trueblood

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We announce the discovery of KELT-16b, a highly irradiated, ultra-short period hot Jupiter transiting the relatively bright (V = 11.7) star TYC 2688-1839-1/KELT-16. A global analysis of the system shows KELT-16 to be an F7V star with ${T}_{\mathrm{eff}}=6236\pm 54$ K, $\mathrm{log}{g}_{\star }={4.253}_{-0.036}^{+0.031}$, $[\mathrm{Fe}/{\rm{H}}]=-{0.002}_{-0.085}^{+0.086}$, ${M}_{\star }={1.211}_{-0.046}^{+0.043}\,{M}_{\odot }$, and ${R}_{\star }\,={1.360}_{-0.053}^{+0.064}{R}_{\odot }$. The planet is a relatively high-mass inflated gas giant with ${M}_{{\rm{P}}}={2.75}_{-0.15}^{+0.16}{M}_{{\rm{J}}}$, ${R}_{{\rm{P}}}={1.415}_{-0.067}^{+0.084}{R}_{{\rm{J}}}$, density ${\rho }_{{\rm{P}}}=1.20\pm 0.18$ g cm−3, surface gravity $\mathrm{log}\,{g}_{{\rm{P}}}={3.530}_{-0.049}^{+0.042}$, and ${T}_{\mathrm{eq}}={2453}_{-47}^{+55}$ K. The best-fitting linear ephemeris is ${T}_{{\rm{C}}}=2457247.24791\pm 0.00019$ ${\mathrm{BJD}}_{\mathrm{TDB}}\ $and $P=0.9689951\pm 0.0000024$ day. KELT-16b joins WASP-18b, −19b, −43b, −103b, and HATS-18b as the only giant transiting planets …

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A Jvla Survey Of The High-Frequency Radio Emission Of The Massive Magnetic B- And O-Type Stars, S. Kurapati, P. Chandra, G. Wade, David H. Cohen, A. David-Uraz, M. Gagne, J. Grunhut, M. E. Oksala, V. Petit, M. Shultz, J. Sundqvist, R. H. D. Townsend, A. Ud-Doula

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We conducted a survey of seven magnetic O-type stars and eleven B-type stars with masses above 8 M⊙ using the Very Large Array in the 1, 3 and 13 cm bands. The survey resulted in a detection of two O- and two B-type stars. While the detected O-type stars – HD 37742 and HD 47129 – are in binary systems, the detected B-type stars, HD 156424 and ALS 9522, are not known to be in binaries. All four stars were detected at 3 cm, whereas three were detected at 1 cm and only one star was detected at 13 cm. …

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Magnetic Massive Stars As Progenitors Of ‘Heavy’ Stellar-Mass Black Holes, V. Petit, Z. Keszthelyi, R. Macinnis, David H. Cohen, R. H. D. Townsend, G. A. Wade, S. L. Thomas, S. P. Owocki, J. Puls, A. Ud-Doula

Physics & Astronomy Faculty Works

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A Jvla Survey Of The High-Frequency Radio Emission Of The Massive Magnetic B- And O-Type Stars, S. Kurapati, P. Chandra, G. Wade, David H. Cohen, A. David-Uraz, M. Gagne, J. Grunhut, M. E. Oksala, V. Petit, M. Shultz, J. Sundqvist, R. H. D. Townsend, A. Ud-Doula

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