Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Doyle, Alexandra E"'
Autor:
Xu, Siyi, Yeh, Sherry, Rogers, Laura. K., Steele, Amy, Dennihy, Erik, Doyle, Alexandra E., Dufour, P., Klein, Beth L., Manser, Christopher J., Melis, Carl, Wang, Tinggui, Weinberger, Alycia J.
The chemical composition of an extrasolar planet is fundamental to its formation, evolution and habitability. In this study, we explore a new way to measure the chemical composition of the building blocks of extrasolar planets, by measuring the gas c
Externí odkaz:
http://arxiv.org/abs/2403.15794
A persistent question in exoplanet demographics is whether exoplanetary systems form from similar compositional building blocks to our own. Polluted white dwarf stars offer a unique way to address this question as they provide measurements of the bul
Externí odkaz:
http://arxiv.org/abs/2306.03743
Autor:
Doyle, Alexandra E., Klein, Beth L., Dufour, Patrick, Melis, Carl, Zuckerman, B., Xu, Siyi, Weinberger, Alycia J., Trierweiler, Isabella L., Monson, Nathaniel N., Jura, Michael A., Young, Edward D.
We present observations and analyses of eight white dwarf stars that have accreted rocky material from their surrounding planetary systems. The spectra of these helium-atmosphere white dwarfs contain detectable optical lines of all four major rock-fo
Externí odkaz:
http://arxiv.org/abs/2303.00063
Polluted white dwarfs offer a unique way to study the bulk compositions of exoplanetary material, but it is not always clear if this material originates from comets, asteroids, moons, or planets. We combine N-body simulations with an analytical model
Externí odkaz:
http://arxiv.org/abs/2205.07935
Publikováno v:
ApJL 907 L35 (2021)
We present evidence that excesses in Be in polluted white dwarfs (WDs) are the result of accretion of icy exomoons that formed in the radiation belts of giant exoplanets. Here we use excess Be in the white dwarf GALEX J2339-0424 as an example. We con
Externí odkaz:
http://arxiv.org/abs/2102.01835
Autor:
Klein, Beth, Doyle, Alexandra E., Zuckerman, B., Dufour, P., Blouin, Simon, Melis, Carl, Weinberger, Alycia J., Young, Edward D.
The element beryllium is detected for the first time in white dwarf stars. This discovery in the spectra of two helium-atmosphere white dwarfs was made possible only because of the remarkable overabundance of Be relative to all other elements, heavie
Externí odkaz:
http://arxiv.org/abs/2102.01834
Autor:
Vanderburg, Andrew, Rappaport, Saul A., Xu, Siyi, Crossfield, Ian, Becker, Juliette C., Gary, Bruce, Murgas, Felipe, Blouin, Simon, Kaye, Thomas G., Palle, Enric, Melis, Carl, Morris, Brett, Kreidberg, Laura, Gorjian, Varoujan, Morley, Caroline V., Mann, Andrew W., Parviainen, Hannu, Pearce, Logan A., Newton, Elisabeth R., Carrillo, Andreia, Zuckerman, Ben, Nelson, Lorne, Zeimann, Greg, Brown, Warren R., Tronsgaard, René, Klein, Beth, Ricker, George R., Vanderspek, Roland K., Latham, David W., Seager, Sara, Winn, Joshua N., Jenkins, Jon M., Adams, Fred C., Benneke, Björn, Berardo, David, Buchhave, Lars A., Caldwell, Douglas A., Christiansen, Jessie L., Collins, Karen A., Colón, Knicole D., Daylan, Tansu, Doty, John, Doyle, Alexandra E., Dragomir, Diana, Dressing, Courtney, Dufour, Patrick, Fukui, Akihiko, Glidden, Ana, Guerrero, Natalia M., Guo, Xueying, Heng, Kevin, Henriksen, Andreea I., Huang, Chelsea X., Kaltenegger, Lisa, Kane, Stephen R., Lewis, John A., Lissauer, Jack J., Morales, Farisa, Narita, Norio, Pepper, Joshua, Rose, Mark E., Smith, Jeffrey C., Stassun, Keivan G., Yu, Liang
Astronomers have discovered thousands of planets outside the solar system, most of which orbit stars that will eventually evolve into red giants and then into white dwarfs. During the red giant phase, any close-orbiting planets will be engulfed by th
Externí odkaz:
http://arxiv.org/abs/2009.07282
Publikováno v:
ApJ 901 10 (2020)
We utilize observations of 16 white dwarf stars to calculate and analyze the oxidation states of the parent bodies accreting onto the stars. Oxygen fugacity, a measure of overall oxidation state for rocks, is as important as pressure and temperature
Externí odkaz:
http://arxiv.org/abs/2008.05992
Publikováno v:
Doyle et al. (2019) Science 366 (6463), 356-359
Oxygen fugacity is a measure of rock oxidation that influences planetary structure and evolution. Most rocky bodies in the Solar System formed at oxygen fugacities approximately five orders of magnitude higher than a hydrogen-rich gas of solar compos
Externí odkaz:
http://arxiv.org/abs/1910.12989
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.