Search Results - "Shectman, Stephen"

OBLIQUITIES OF HOT JUPITER HOST STARS: EVIDENCE FOR TIDAL INTERACTIONS AND PRIMORDIAL MISALIGNMENTS by ALBRECHT, Simon, WINN, Joshua N, HIRANO, Teruyuki, BAKOS, Gaspar, HARTMAN, Joel D, JOHNSON, John A, HOWARD, Andrew W, MARCY, Geoffrey W, PAUL BUTLER, R, ARRIAGADA, Pamela, CRANE, Jeffrey D, SHECTMAN, Stephen A, THOMPSON, Ian B

“…We provide evidence that the obliquities of stars with close-in giant planets were initially nearly random, and that the low obliquities that are often…”
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NEUTRON-CAPTURE NUCLEOSYNTHESIS IN THE FIRST STARS by Roederer, Ian U, Preston, George W, Thompson, Ian B, Shectman, Stephen A, Sneden, Christopher

“…Recent studies suggest that metal-poor stars enhanced in carbon but containing low levels of neutron-capture elements may have been among the first to…”
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CHEMICAL SIGNATURES OF THE FIRST SUPERNOVAE IN THE SCULPTOR DWARF SPHEROIDAL GALAXY by Simon, Joshua D, Jacobson, Heather R, Frebel, Anna, Thompson, Ian B, Adams, Joshua J, Shectman, Stephen A

“…We present a homogeneous chemical abundance analysis of five of the most metal-poor stars in the Sculptor dwarf spheroidal galaxy. We analyze new and archival…”
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A complete census of circumgalactic Mg ii at redshift z ≲ 0.5 by Huang, Yun-Hsin, Chen, Hsiao-Wen, Shectman, Stephen A, Johnson, Sean D, Zahedy, Fakhri S, Helsby, Jennifer E, Gauthier, Jean-René, Thompson, Ian B

“…ABSTRACT This paper presents a survey of Mg ii absorbing gas in the vicinity of 380 random galaxies, using 156 background quasi-stellar objects (QSOs) as…”
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Detailed chemical abundances in NGC 5824: another metal-poor globular cluster with internal heavy element abundance variations by Roederer, Ian U, Mateo, Mario, Bailey, John I, Spencer, Meghin, Crane, Jeffrey D, Shectman, Stephen A

“…We present radial velocities, stellar parameters, and detailed abundances of 39 elements derived from high-resolution spectroscopic observations of red giant…”
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Vanadium Abundance Derivations in 255 Metal-poor Stars by Ou 欧, Xiaowei 筱葳, Roederer, Ian U., Sneden, Christopher, Cowan, John J., Lawler, James E., Shectman, Stephen A., Thompson, Ian B.

“…Abstract We present vanadium (V) abundances for 255 metal-poor stars derived from high-resolution optical spectra from the Magellan Inamori Kyocera Echelle…”
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Detection of a Population of Carbon-enhanced Metal-poor Stars in the Sculptor Dwarf Spheroidal Galaxy by Chiti, Anirudh, Simon, Joshua D., Frebel, Anna, Thompson, Ian B., Shectman, Stephen A., Mateo, Mario, Bailey, John I., Crane, Jeffrey D., Walker, Matthew

“…Abstract The study of the chemical abundances of metal-poor stars in dwarf galaxies provides a venue to constrain paradigms of chemical enrichment and galaxy…”
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Characterizing the Chemistry of the Milky Way Stellar Halo: Detailed Chemical Analysis of a Metal-poor Stellar Stream by Roederer, Ian U, Sneden, Christopher, Thompson, Ian B, Preston, George W, Shectman, Stephen A

“…We present the results of a detailed abundance analysis of one of the confirmed building blocks of the Milky Way stellar halo, a kinematically coherent…”
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3D Selection of 167 Substellar Companions to Nearby Stars by Feng, Fabo, Butler, R. Paul, Vogt, Steven S., Clement, Matthew S., Tinney, C. G., Cui, Kaiming, Aizawa, Masataka, Jones, Hugh R. A., Bailey, J., Burt, Jennifer, Carter, B. D., Crane, Jeffrey D., Dotti, Francesco Flammini, Holden, Bradford, Ma, Bo, Ogihara, Masahiro, Oppenheimer, Rebecca, O’Toole, S. J., Shectman, Stephen A., Wittenmyer, Robert A., Wang, Sharon X., Wright, D. J., Xuan, Yifan

“…Abstract We analyze 5108 AFGKM stars with at least five high-precision radial velocity points, as well as Gaia and Hipparcos astrometric data, utilizing a…”
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An Empirical Characterization of Extended Cool Gas Around Galaxies Using Mg II Absorption Features by Chen, Hsiao-Wen, Helsby, Jennifer E, Gauthier, Jean-René, Shectman, Stephen A, Thompson, Ian B, Tinker, Jeremy L

“…We report results from a survey of Mg II absorbers in the spectra of background quasi-stellar objects (QSOs) that are within close angular distances to a…”
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IMACS: The Inamori-Magellan Areal Camera and Spectrograph on Magellan-Baade by Dressler, Alan, Bigelow, Bruce, Hare, Tyson, Sutin, Brian, Thompson, Ian, Burley, Greg, Epps, Harland, Oemler, Augustus, Bagish, Alan, Birk, Christoph, Clardy, Ken, Gunnels, Steve, Kelson, Daniel, Shectman, Stephen, Osip, David

“…The Inamori-Magellan Areal Camera and Spectrograph (IMACS) is a wide-field, multipurpose imaging spectrograph on the Magellan-Baade telescope at Las Campanas…”
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Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions by Laliotis, Katherine, Burt, Jennifer A., Mamajek, Eric E., Li, Zhexing, Perdelwitz, Volker, Zhao, Jinglin, Butler, R. Paul, Holden, Bradford, Rosenthal, Lee, Fulton, B. J., Feng, Fabo, Kane, Stephen R., Bailey, Jeremy, Carter, Brad, Crane, Jeffrey D., Furlan, Elise, Gnilka, Crystal L., Howell, Steve B., Laughlin, Gregory, Shectman, Stephen A., Teske, Johanna K., Tinney, C. G., Vogt, Steven S., Wang, Sharon Xuesong, Wittenmyer, Robert A.

“…Abstract Directly imaging temperate rocky planets orbiting nearby, Sun-like stars with a 6 m class IR/O/UV space telescope, recently dubbed the Habitable…”
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The PFS View of TOI-677 b: A Spin–Orbit Aligned Warm Jupiter in a Dynamically Hot System by Hu, Qingru, Rice, Malena, Wang, Xian-Yu, Wang, Songhu, Shporer, Avi, Teske, Johanna K., Yee, Samuel W., Butler, R. Paul, Shectman, Stephen, Crane, Jeffrey D., Collins, Karen A., Collins, Kevin I.

“…Abstract TOI-677 b is part of an emerging class of “tidally detached” gas giants ( a / R ⋆ ≳ 11) that exhibit large orbital eccentricities and yet low stellar…”
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Nine new metal-poor stars on the subgiant and red horizontal branches with high levels of r-process enhancement by Roederer, Ian U., Cowan, John J., Preston, George W., Shectman, Stephen A., Sneden, Christopher, Thompson, Ian B.

“…We report the discovery of nine metal-poor stars with high levels of r-process enhancement (+0.81 ≤ [Eu/Fe] ≤ +1.13), including six subgiants and three stars…”
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DEMONSTRATING DIVERSITY IN STAR-FORMATION HISTORIES WITH THE CSI SURVEY by Dressler, Alan, Kelson, Daniel D., Abramson, Louis E., Gladders, Michael D., Oemler, Augustus, Poggianti, Bianca M., Mulchaey, John S., Vulcani, Benedetta, Shectman, Stephen A., Williams, Rik J., McCarthy, Patrick J.

“…ABSTRACT We present coarse but robust star-formation histories (SFHs) derived from spectrophotometric data of the Carnegie-Spitzer-IMACS Survey, for 22,494…”
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TOI-2525 b and c: A Pair of Massive Warm Giant Planets with Strong Transit Timing Variations Revealed by TESS by Trifonov, Trifon, Brahm, Rafael, Jordán, Andrés, Hartogh, Christian, Henning, Thomas, Hobson, Melissa J., Schlecker, Martin, Howard, Saburo, Reichardt, Finja, Espinoza, Nestor, Lee, Man Hoi, Nesvorny, David, Rojas, Felipe I., Barkaoui, Khalid, Kossakowski, Diana, Boyle, Gavin, Dreizler, Stefan, Kürster, Martin, Heller, René, Guillot, Tristan, Triaud, Amaury H. M. J., Abe, Lyu, Agabi, Abdelkrim, Bendjoya, Philippe, Crouzet, Nicolas, Dransfield, Georgina, Gasparetto, Thomas, Günther, Maximilian N., Marie-Sainte, Wenceslas, Mékarnia, Djamel, Suarez, Olga, Teske, Johanna, Butler, R. Paul, Crane, Jeffrey D., Shectman, Stephen, Ricker, George R., Shporer, Avi, Vanderspek, Roland, Jenkins, Jon M., Wohler, Bill, Collins, Karen A., Collins, Kevin I., Ciardi, David R., Barclay, Thomas, Mireles, Ismael, Seager, Sara, Winn, Joshua N.

“…Abstract The K-type star TOI-2525 has an estimated mass of M = 0.849 − 0.033 + 0.024 M ⊙ and radius of R = 0.785 − 0.007 + 0.007 R ⊙ observed by the TESS…”
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The radial velocity dispersion profile of the Galactic halo: constraining the density profile of the dark halo of the Milky Way by Battaglia, Giuseppina, Helmi, Amina, Morrison, Heather, Harding, Paul, Olszewski, Edward W., Mateo, Mario, Freeman, Kenneth C., Norris, John, Shectman, Stephen A.

“…We have compiled a new sample of 240 halo objects with accurate distance and radial velocity measurements, including globular clusters, satellite galaxies,…”
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HD 222237 b: a long-period super-Jupiter around a nearby star revealed by radial-velocity and Hipparcos–Gaia astrometry by Xiao, Guang-Yao, Feng, Fabo, Shectman, Stephen A, Tinney, C G, Teske, Johanna K, Carter, B D, Jones, H R A, Wittenmyer, Robert A, Díaz, Matías R, Crane, Jeffrey D, Wang, Sharon X, Bailey, J, O’Toole, S J, Feinstein, Adina D, Rice, Malena, Essack, Zahra, Montet, Benjamin T, Shporer, Avi, Butler, R Paul

“…ABSTRACT Giant planets on long-period orbits around the nearest stars are among the easiest to directly image. Unfortunately these planets are difficult to…”
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Evidence for Low-level Dynamical Excitation in Near-resonant Exoplanet Systems by Rice, Malena, Wang, Xian-Yu, Wang, Songhu, Shporer, Avi, Barkaoui, Khalid, Brahm, Rafael, Collins, Karen A., Jordán, Andrés, Lowson, Nataliea, Butler, R. Paul, Crane, Jeffrey D., Shectman, Stephen, Teske, Johanna K., Osip, David, Collins, Kevin I., Murgas, Felipe, Boyle, Gavin, Pozuelos, Francisco J., Timmermans, Mathilde, Jehin, Emmanuel, Gillon, Michaël

“…Abstract The geometries of near-resonant planetary systems offer a relatively pristine window into the initial conditions of exoplanet systems. Given that…”
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THE CARNEGIE-SPITZER-IMACS REDSHIFT SURVEY OF GALAXY EVOLUTION SINCE z = 1.5. I. DESCRIPTION AND METHODOLOGY by Kelson, Daniel D, Williams, Rik J, Dressler, Alan, McCarthy, Patrick J, Shectman, Stephen A, MULCHAEY, JOHN S, Villanueva, Edward V, Crane, Jeffrey D, Quadri, Ryan F

“…We describe the Carnegie-Spitzer-IMACS (CSI) Survey, a wide-field, near-IR selected spectrophotometric redshift survey with the Inamori Magellan Areal Camera…”
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