Zobrazeno 1 - 10
of 282
pro vyhledávání: '"Simpson, Jeffrey D."'
Autor:
Clark, Jake T., Wright, Duncan J., Wittenmyer, Robert A., Horner, Jonathan, Hinkel, Natalie R., Clerté, Mathieu, Carter, Brad D., Buder, Sven, Hayden, Michael R., Bland-Hawthorn, Joss, Casey, Andrew R., De Silva, Gayandhi M., D'Orazi, Valentina, Freeman, Ken C., Kos, Janez, Lewis, Geraint F., Lin, Jane, Lind, Karin, Martell, Sarah L., Schlesinger, Katharine J., Sharma, Sanjib, Simpson, Jeffrey D., Stello, Dennis, Zucker, Daniel B., Zwitter, Tomaž, Munari, Ulisse, Nordlander, Thomas
Pioneering photometric, astrometric, and spectroscopic surveys are helping exoplanetary scientists better constrain the fundamental properties of stars within our galaxy, and the planets these stars host. In this study, we use the third data release
Externí odkaz:
http://arxiv.org/abs/2111.14883
Autor:
Li, Ting S., Ji, Alexander P., Pace, Andrew B., Erkal, Denis, Koposov, Sergey E., Shipp, Nora, Da Costa, Gary S., Cullinane, Lara R., Kuehn, Kyler, Lewis, Geraint F., Mackey, Dougal, Simpson, Jeffrey D., Zucker, Daniel B., Ferguson, Peter S., Martell, Sarah L., Bland-Hawthorn, Joss, Balbinot, Eduardo, Tavangar, Kiyan, Drlica-Wagner, Alex, De Silva, Gayandhi M., Simon, Joshua D., Collaboration, S5
We report the kinematic, orbital, and chemical properties of 12 stellar streams with no evident progenitors, using line-of-sight velocities and metallicities from the Southern Stellar Stream Spectroscopic Survey ($S^5$), proper motions from $Gaia$ ED
Externí odkaz:
http://arxiv.org/abs/2110.06950
Autor:
Buder, Sven, Lind, Karin, Ness, Melissa K., Feuillet, Diane K., Horta, Danny, Monty, Stephanie, Buck, Tobias, Nordlander, Thomas, Bland-Hawthorn, Joss, Casey, Andrew R., De Silva, Gayandhi M., D'Orazi, Valentina, Freeman, Ken C., Hayden, Michael R., Kos, Janez, Martell, Sarah L., Lewis, Geraint F., Lin, Jane, Schlesinger, Katharine. J., Sharma, Sanjib, Simpson, Jeffrey D., Stello, Dennis, Zucker, Daniel B., Zwitter, Tomaz, Ciuca, Ioana, Horner, Jonathan, Kobayashi, Chiaki, Ting, Yuan-Sen, Wyse, Rosemary F. G., Collaboration, The GALAH
Publikováno v:
MNRAS, 510, 2407 (2022)
Since the advent of $Gaia$ astrometry, it is possible to identify massive accreted systems within the Galaxy through their unique dynamical signatures. One such system, $Gaia$-Sausage-Enceladus (GSE), appears to be an early "building block" given its
Externí odkaz:
http://arxiv.org/abs/2109.04059
Autor:
Casey, Andrew R., Ji, Alexander P., Hansen, Terese T., Li, Ting S., Koposov, Sergey E., Da Costa, Gary S., Bland-Hawthorn, Joss, Cullinane, Lara, Erkal, Denis, Lewis, Geraint F., Kuehn, Kyler, Mackey, Dougal, Martell, Sarah L., Pace, Andrew B., Simpson, Jeffrey D., Zucker, Daniel B.
The Phoenix stellar stream has a low intrinsic dispersion in velocity and metallicity that implies the progenitor was probably a low mass globular cluster. In this work we use Magellan/MIKE high-dispersion spectroscopy of eight Phoenix stream red gia
Externí odkaz:
http://arxiv.org/abs/2109.03948
Autor:
Shipp, Nora, Erkal, Denis, Drlica-Wagner, Alex, Li, Ting S., Pace, Andrew B., Koposov, Sergey E., Cullinane, Lara R., Da Costa, Gary S., Ji, Alexander P., Kuehn, Kyler, Lewis, Geraint F., Mackey, Dougal, Simpson, Jeffrey D., Wan, Zhen, Zucker, Daniel B., Bland-Hawthorn, Joss, Ferguson, Peter S., Lilleengen, Sophia, Collaboration, S5
Stellar streams are excellent probes of the underlying gravitational potential in which they evolve. In this work, we fit dynamical models to five streams in the Southern Galactic hemisphere, combining observations from the Southern Stellar Stream Sp
Externí odkaz:
http://arxiv.org/abs/2107.13004
Autor:
Ji, Alexander P., Koposov, Sergey E., Li, Ting S., Erkal, Denis, Pace, Andrew B., Simon, Joshua D., Belokurov, Vasily, Cullinane, Lara R., Da Costa, Gary S., Kuehn, Kyler, Lewis, Geraint F., Mackey, Dougal, Shipp, Nora, Simpson, Jeffrey D., Zucker, Daniel B., Hansen, Terese T., Bland-Hawthorn, Joss, Collaboration, S5
We present new spectroscopic observations of the diffuse Milky Way satellite galaxies Antlia 2 and Crater 2, taken as part of the Southern Stellar Stream Spectroscopic Survey (S5). The new observations approximately double the number of confirmed mem
Externí odkaz:
http://arxiv.org/abs/2106.12656
Autor:
Zucker, Daniel B., Simpson, Jeffrey D., Martell, Sarah L., Lewis, Geraint F., Casey, Andrew R., Ting, Yuan-Sen, Horner, Jonathan, Nordlander, Thomas, Wyse, Rosemary F. G., Zwitter, Tomaz, Bland-Hawthorn, Joss, Buder, Sven, Asplund, Martin, De Silva, Gayandhi M., D'Orazi, Valentina, Freeman, Ken C., Hayden, Michael R., Kos, Janez, Lin, Jane, Lind, Karin, Schlesinger, Katharine J., Sharma, Sanjib, Stello, Dennis
The results from the ESA Gaia astrometric mission and deep photometric surveys have revolutionized our knowledge of the Milky Way. There are many ongoing efforts to search these data for stellar substructure to find evidence of individual accretion e
Externí odkaz:
http://arxiv.org/abs/2104.08684
Autor:
Zwitter, Tomaž, Kos, Janez, Buder, Sven, Čotar, Klemen, Asplund, Martin, Bland-Hawthorn, Joss, Casey, Andrew R., De Silva, Gayandhi M., D'Orazi, Valentina, Freeman, Kenneth C., Hayden, Michael R., Lewis, Geraint F., Lin, Jane, Lind, Karin, Martell, Sarah L., Schlesinger, Katharine J., Sharma, Sanjib, Simpson, Jeffrey D., Stello, Dennis, Zucker, Daniel B., Beeson, Kevin L., de Grijs, Richard, Nordlander, Thomas, Ting, Yuan-Sen, Traven, Gregor, Vogrinčič, Rok, Watson, Fred, Wittenmyer, Rob
Publikováno v:
2021, MNRAS, 508, 4202-4215
GALAH+ is a magnitude-limited survey of high resolution stellar spectra obtained by the HERMES spectrograph at the Australian Astronomical Observatory. Its third data release provides reduced spectra with new derivations of stellar parameters and abu
Externí odkaz:
http://arxiv.org/abs/2012.12201
Autor:
Sharma, Sanjib, Hayden, Michael R., Bland-Hawthorn, Joss, Stello, Dennis, Buder, Sven, Zinn, Joel C., Spina, Lorenzo, Kallinger, Thomas, Asplund, Martin, De Silva, Gayandhi M., D'Orazi, Valentina, Freeman, Ken C., Kos, Janez, Lewis, Geraint F., Lin, Jane, Lind, Karin, Martell, Sarah L., Schlesinger, Katharine J., Simpson, Jeffrey D., Zucker, Daniel B., Zwitter, Tomaz, Cotar, Klemen, Chen, Boquan, Kafle, Prajwal R., Khanna, Shourya, Wang, Purmortal, Wittenmyer, Rob A.
Using data from the GALAH survey, we explore the dependence of elemental abundances on stellar age and metallicity among Galactic disc stars. We find that the abundance of most elements can be predicted from age and [Fe/H] with an intrinsic scatter o
Externí odkaz:
http://arxiv.org/abs/2011.13818
Autor:
Hayden, Michael R., Sharma, Sanjib, Bland-Hawthorn, Joss, Spina, Lorenzo, Buder, Sven, Asplund, Martin, Casey, Andrew R., De Silva, Gayandhi M., D'Orazi, Valentina, Freeman, Ken C., Kos, Janez, Lewis, Geraint F., Lin, Jane, Lind, Karin, Martell, Sarah L., Schlesinger, Katharine J., Simpson, Jeffrey D., Zucker, Daniel B., Zwitter, Tomaz, Chen, Boquan, Cotar, Klemen, Feuillet, Diane, Horner, Jonti, Joyce, Meridith, Nordlander, Thomas, Stello, Dennis, Tepper-Garcia, Thorsten, Ting, Yuan-sen, Wang, Purmortal, Wittenmyer, Rob
Previous studies have found that the elemental abundances of a star correlate directly with its age and metallicity. Using this knowledge, we derive ages for a sample of 250,000 stars taken from GALAH DR3 using only their overall metallicity and chem
Externí odkaz:
http://arxiv.org/abs/2011.13745