Zobrazeno 1 - 10
of 38
pro vyhledávání: '"John B. Laird"'
Autor:
Michael V. Reinhard, John B. Laird
Publikováno v:
The Astronomical Journal, Vol 167, Iss 1, p 6 (2023)
Previous studies have shown that the halo of the Milky Way galaxy is made up of two distinct stellar populations, one from dissipative collapse and the other accreted. Elemental abundances with small relative uncertainties along with kinematics are d
Externí odkaz:
https://doaj.org/article/20d25da880354066b6650be62d129169
Autor:
Elizabeth M. Green, M. Vuckovic, Pieter Degroote, Tom Marsh, Jørgen Christensen-Dalsgaard, Steven Bloemen, R. Oreiro, Michael D. Reed, M. Morris, Steven D. Kawaler, John H. Telting, John B. Laird, Hans Kjeldsen, Ronald L. Gilliland, Conny Aerts, William J. Borucki, Roy Ostensen, David Koch, E. Moriyama
Publikováno v:
Monthly Notices of the Royal Astronomical Society: Letters. 408:L51-L55
2M1938+4603 (KIC 9472174) displays a spectacular light curve dominated by a strong reflection effect and rather shallow, grazing eclipses. The orbital period is 0.126 days, the second longest period yet found for an eclipsing sdB+dM, but still close
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31b0b546d6efa6d8dc4fd7ec078992b1
https://doi.org/10.1111/j.1745-3933.2010.00926.x
https://doi.org/10.1111/j.1745-3933.2010.00926.x
Autor:
Bruce W. Carney, Alessandro Sozzetti, Sylvain G. Korzennik, Alan P. Boss, D. W. Latham, Guillermo Torres, Robert P. Stefanik, John B. Laird
Publikováno v:
Proceedings of the International Astronomical Union. 5:416-419
We present an analysis of three years of precision radial velocity measurements of 160 metal-poor stars observed with Keck/HIRES. We report on variability and long-term velocity trends for each star in our sample. We identify several long-term, low-a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ad4edb211c3525593debb68e1608f5fe
https://doi.org/10.1017/s1743921310001110
https://doi.org/10.1017/s1743921310001110
Autor:
Robert P. Stefanik, John B. Laird, Guillermo Torres, David W. Latham, Sylvain G. Korzennik, Bruce W. Carney, Alan P. Boss, Alessandro Sozzetti
Publikováno v:
The Astrophysical Journal. 697:544-556
We present an analysis of three years of precision radial velocity measurements of 160 metal-poor stars observed with HIRES on the Keck 1 telescope. We report on variability and long-term velocity trends for each star in our sample. We identify sever
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::90f2b3f7c4f882041b53d315bf94dbdc
https://doi.org/10.1088/0004-637x/697/1/544
https://doi.org/10.1088/0004-637x/697/1/544
Autor:
Francis T. O'Donovan, David Charbonneau, Guillermo Torres, Matthew J. Holman, David W. Latham, Alessandro Sozzetti, John B. Laird, Joshua N. Winn
Publikováno v:
The Astrophysical Journal. 664:1190-1198
We report on a spectroscopic determination of the atmospheric parameters and chemical abundance of the parent star of the recently discovered transiting planet {TrES-2}. A detailed LTE analysis of a set of \ion{Fe}{1} and \ion{Fe}{2} lines from our K
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::563e152abe774a7e842534e76905812b
https://doi.org/10.1086/519214
https://doi.org/10.1086/519214
Autor:
Robert P. Stefanik, John B. Laird, Guillermo Torres, David W. Latham, Alessandro Sozzetti, Bruce W. Carney, Sylvain G. Korzennik, Alan P. Boss
Publikováno v:
The Astrophysical Journal. 649:428-435
We describe a high-precision Doppler search for giant planets orbiting a well-defined sample of metal-poor dwarfs in the field. This experiment constitutes a fundamental test of theoretical predictions which will help discriminate between proposed gi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e1ecf47be2ec87dde48dcd1c24a04bc
https://doi.org/10.1086/506267
https://doi.org/10.1086/506267
Autor:
Guillermo Torres, Bruce W. Carney, David Yong, David W. Latham, John B. Laird, Alessandro Sozzetti
Publikováno v:
NASA Astrophysics Data System
We present a detailed chemical abundance analysis of the parent star of the transiting extrasolar planet TrES-1. Based on high-resolution Keck/HIRES and HET/HRS spectra, we have determined abundances relative to the Sun for 16 elements (Na, Mg, Al, S
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0f7977308adafbac006b214ebf219ab
https://doi.org/10.1086/500639
https://doi.org/10.1086/500639
Publikováno v:
The Astronomical Journal. 129:1886-1905
We find a deficiency of binary stars moving on strongly retrograde Galactic orbits. No binary deficiencies are seen for U or W velocities, however. From theoretical analyses, we rule out preferential disruption of pre-existing binary stars due to enc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f07869366a63413ede54f29d00b558e4
https://doi.org/10.1086/427542
https://doi.org/10.1086/427542
Publikováno v:
The Astronomical Journal. 125:293-321
We summarize 2007 radial velocity measurements of 91 metal-poor field red giants. Excluding binary systems with orbital solutions, our coverage averages 13.7 yr per star, with a maximum of 18.0 yr. We report four significant findings. (1) Sixteen sta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::40ce5e4703abe67705c9ff63060d3726
https://doi.org/10.1086/345386
https://doi.org/10.1086/345386
Autor:
Terese T. Hansen, Michael Endl, Lars A. Buchhave, David W. Latham, David R. Ciardi, Caroline Caldwell, Natalie M. Batalha, Martin Bizzarro, Stephen T. Bryson, Jason F. Rowe, Anders Johansen, Gilbert A. Esquerdo, John C. Geary, Philip W. Lucas, Geoffrey W. Marcy, Ronald L. Gilliland, Martin Still, Samuel N. Quinn, Avi Shporer, William D. Cochran, Robert P. Stefanik, John B. Laird, Eric B. Ford, Jon A. Morse, Erik Brugamyer, Paul Robertson, Howard Isaacson, Guillermo Torres, William J. Borucki
Publikováno v:
Nature
The abundance of heavy elements (metallicity) in the photospheres of stars similar to the Sun provides a 'fossil' record of the chemical composition of the initial protoplanetary disk. Metal-rich stars are much more likely to harbour gas giant planet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ebd544f4aba6c6948ec260b0f501e1a9
https://doi.org/10.1038/nature11121
https://doi.org/10.1038/nature11121