Search Results - "Koester, Detlev"

Accretion of a giant planet onto a white dwarf star by Gänsicke, Boris T., Schreiber, Matthias R., Toloza, Odette, Fusillo, Nicola P. Gentile, Koester, Detlev, Manser, Christopher J.

“…The detection 1 of a dust disk around the white dwarf star G29-38 and transits from debris orbiting the white dwarf WD 1145+017 (ref. 2 ) confirmed that the…”
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Interpretation and diversity of exoplanetary material orbiting white dwarfs by Swan, Andrew, Farihi, Jay, Koester, Detlev, Hollands, Mark, Parsons, Steven, Cauley, P Wilson, Redfield, Seth, Gänsicke, Boris T

“…ABSTRACT Nine metal-polluted white dwarfs are observed with medium-resolution optical spectroscopy, where photospheric abundances are determined and…”
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Three Hypervelocity White Dwarfs in Gaia DR2: Evidence for Dynamically Driven Double-degenerate Double-detonation Type Ia Supernovae by Shen, Ken J., Boubert, Douglas, Gänsicke, Boris T., Jha, Saurabh W., Andrews, Jennifer E., Chomiuk, Laura, Foley, Ryan J., Fraser, Morgan, Gromadzki, Mariusz, Guillochon, James, Kotze, Marissa M., Maguire, Kate, Siebert, Matthew R., Smith, Nathan, Strader, Jay, Badenes, Carles, Kerzendorf, Wolfgang E., Koester, Detlev, Kromer, Markus, Miles, Broxton, Pakmor, Rüdiger, Schwab, Josiah, Toloza, Odette, Toonen, Silvia, Townsley, Dean M., Williams, Brian J.

“…Double detonations in double white dwarf (WD) binaries undergoing unstable mass transfer have emerged in recent years as one of the most promising Type Ia…”
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A planetesimal orbiting within the debris disc around a white dwarf star by Manser, Christopher J, Gänsicke, Boris T, Eggl, Siegfried, Hollands, Mark, Izquierdo, Paula, Koester, Detlev, Landstreet, John D, Lyra, Wladimir, Marsh, Thomas R, Meru, Farzana, Mustill, Alexander J, Rodríguez-Gil, Pablo, Toloza, Odette, Veras, Dimitri, Wilson, David J, Burleigh, Matthew R, Davies, Melvyn B, Farihi, Jay, Gentile Fusillo, Nicola, de Martino, Domitilla, Parsons, Steven G, Quirrenbach, Andreas, Raddi, Roberto, Reffert, Sabine, Del Santo, Melania, Schreiber, Matthias R, Silvotti, Roberto, Toonen, Silvia, Villaver, Eva, Wyatt, Mark, Xu, Siyi, Portegies Zwart, Simon

“…Many white dwarf stars show signs of having accreted smaller bodies, implying that they may host planetary systems. A small number of these systems contain…”
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White dwarf pollution by hydrated planetary remnants: hydrogen and metals in WD J204713.76–125908.9 by Hoskin, Matthew J, Toloza, Odette, Gänsicke, Boris T, Raddi, Roberto, Koester, Detlev, Pala, Anna F, Manser, Christopher J, Farihi, Jay, Belmonte, Maria Teresa, Hollands, Mark, Gentile Fusillo, Nicola, Swan, Andrew

“…ABSTRACT WD J204713.76–125908.9 is a new addition to the small class of white dwarfs with helium-dominated photospheres that exhibit strong Balmer absorption…”
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Testing White Dwarf Age Estimates Using Wide Double White Dwarf Binaries from Gaia EDR3 by Heintz, Tyler M., Hermes, J. J., El-Badry, Kareem, Walsh, Charlie, van Saders, Jennifer L., Fields, C. E., Koester, Detlev

“…Abstract White dwarf (WD) stars evolve simply and predictably, making them reliable age indicators. However, self-consistent validation of the methods for…”
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Alkali metals in white dwarf atmospheres as tracers of ancient planetary crusts by Hollands, Mark A., Tremblay, Pier-Emmanuel, Gänsicke, Boris T., Koester, Detlev, Gentile-Fusillo, Nicola Pietro

“…White dwarfs that accrete the debris of tidally disrupted asteroids 1 provide the opportunity to measure the bulk composition of the building blocks, or…”
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Erratum: “Testing White Dwarf Age Estimates Using Wide Double White Dwarf Binaries from Gaia EDR3” (2022, ApJ, 934, 148) by Heintz, Tyler M., Hermes, J. J., El-Badry, Kareem, Walsh, Charlie, van Saders, Jennifer L., Fields, C. E., Koester, Detlev

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Trace hydrogen in helium atmosphere white dwarfs as a possible signature of water accretion by Gentile Fusillo, Nicola Pietro, Gänsicke, Boris T., Farihi, Jay, Koester, Detlev, Schreiber, Matthias R., Pala, Anna F.

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Are sdAs helium core stars? by Pelisoli, Ingrid, Kepler, S. O., Koester, Detlev

“…Evolved stars with a helium core can be formed by non-conservative mass exchange interaction with a companion or by strong mass loss. Their masses are smaller…”
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The Temperature Scale and Mass Distribution of Hot DA White Dwarfs by Finley, David S, Koester, Detlev, Basri, Gibor

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White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 16 by Kepler, S O, Koester, Detlev, Pelisoli, Ingrid, Romero, Alejandra D, Ourique, Gustavo

“…ABSTRACT White dwarfs are the end state of the evolution of more than 97 per cent of all stars, and therefore carry information on the structure and evolution…”
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White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14 by Kepler, S O, Pelisoli, Ingrid, Koester, Detlev, Reindl, Nicole, Geier, Stephan, Romero, Alejandra D, Ourique, Gustavo, Oliveira, Cristiane de Paula, Amaral, Larissa A

“…ABSTRACT White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass…”
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Planets or asteroids? A geochemical method to constrain the masses of White Dwarf pollutants by Buchan, Andrew M, Bonsor, Amy, Shorttle, Oliver, Wade, Jon, Harrison, John, Noack, Lena, Koester, Detlev

“…ABSTRACT Polluted white dwarfs that have accreted planetary material provide a unique opportunity to probe the geology of exoplanetary systems. However, the…”
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A white dwarf with an oxygen atmosphere by Kepler, S. O., Koester, Detlev, Ourique, Gustavo

“…Stars born with masses below around 10 solar masses end their lives as white dwarf stars. Their atmospheres are dominated by the lightest elements because…”
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Convective overshoot and macroscopic diffusion in pure-hydrogen-atmosphere white dwarfs by Cunningham, Tim, Tremblay, Pier-Emmanuel, Freytag, Bernd, Ludwig, Hans-Günter, Koester, Detlev

“…Abstract We present a theoretical description of macroscopic diffusion caused by convective overshoot in pure-hydrogen DA white dwarfs using 3D, closed-bottom,…”
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Planetesimals at DZ stars – I. Chondritic compositions and a massive accretion event by Swan, Andrew, Farihi, Jay, Melis, Carl, Dufour, Patrick, Desch, Steven J, Koester, Detlev, Guo, Jincheng

“…ABSTRACT There is a wealth of evidence to suggest that planetary systems can survive beyond the main sequence. Most commonly, white dwarfs are found to be…”
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Bayesian constraints on the origin and geology of exoplanetary material using a population of externally polluted white dwarfs by Harrison, John H D, Bonsor, Amy, Kama, Mihkel, Buchan, Andrew M, Blouin, Simon, Koester, Detlev

“…ABSTRACT White dwarfs that have accreted planetary bodies are a powerful probe of the bulk composition of exoplanetary material. In this paper, we present a…”
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GD 424 – a helium-atmosphere white dwarf with a large amount of trace hydrogen in the process of digesting a rocky planetesimal by Izquierdo, Paula, Toloza, Odette, Gänsicke, Boris T, Rodríguez-Gil, Pablo, Farihi, Jay, Koester, Detlev, Guo, Jincheng, Redfield, Seth

“…ABSTRACT The photospheric metal pollution of white dwarfs is now well established as the signature of the accretion of planetary debris. However, the origin of…”
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Carbon to oxygen ratios in extrasolar planetesimals by Wilson, David J, Gaensicke, Boris T, Farihi, Jay, Koester, Detlev

“…Observations of small extrasolar planets with a wide range of densities imply a variety of planetary compositions and structures. Currently, the only technique…”
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