First semi-empirical test of the white dwarf mass-radius relationship using a single white dwarf via astrometric microlensing

Autor: McGill, Peter, Anderson, Jay, Casertano, Stefano, Sahu, Kailash C., Bergeron, Pierre, Blouin, Simon, Dufour, Patrick, Smith, Leigh C., Evans, N. Wyn, Belokurov, Vasily, Smart, Richard L., Bellini, Andrea, Calamida, Annalisa, Dominik, Martin, Kains, Noé, Klüter, Jonas, Nielsen, Martin Bo, Wambsganss, Joachim

In November 2019, the nearby single, isolated DQ-type white dwarf LAWD 37 (WD 1142-645) aligned closely with a distant background source and caused an astrometric microlensing event. Leveraging astrometry from \Gaia{} and followup data from the \text

Externí odkaz: http://arxiv.org/abs/2206.01814

Chronologically dating the early assembly of the Milky Way

Autor: Montalbán, Josefina, Mackereth, John Ted, Miglio, Andrea, Vincenzo, Fiorenzo, Chiappini, Cristina, Buldgen, Gaël, Mosser, Benoît, Noels, Arlette, Scuflaire, Richard, Vrard, Mathieu, Willett, Emma, Davies, Guy R., Hall, Oliver, Nielsen, Martin Bo, Khan, Saniya, Rendle, Ben M., van Rossem, Walter E., Ferguson, Jason W., Chaplin, William J.

The standard cosmological model ($\Lambda$-CDM) predicts that galaxies are built through hierarchical assembly on cosmological timescales$^{1,2}$. The Milky Way, like other disc galaxies, underwent violent mergers and accretion of small satellite gal

Externí odkaz: http://arxiv.org/abs/2006.01783

Age dating of an early Milky Way merger via asteroseismology of the naked-eye star $\nu$ Indi

Autor: Chaplin, William J., Serenelli, Aldo M., Miglio, Andrea, Morel, Thierry, Mackereth, J. Ted, Vincenzo, Fiorenzo, Basu, Hans Kjeldsen Sarbani, Ball, Warrick H., Stokholm, Amalie, Verma, Kuldeep, Mosumgaard, Jakob Rørsted, Aguirre, Victor Silva, Mazumdar, Anwesh, Ranadive, Pritesh, Antia, H. M., Lebreton, Yveline, Ong, Joel, Appourchaux, Thierry, Bedding, Timothy R., Christensen-Dalsgaard, Jørgen, Creevey, Orlagh, García, Rafael A., Handberg, Rasmus, Huber, Daniel, Kawaler, Steven D., Lund, Mikkel N., Metcalfe, Travis S., Stassun, Keivan G., Bazot, Michäel, Beck, Paul, Bell, Keaton J., Bergemann, Maria, Buzasi, Derek L., Benomar, Othman, Bossini, Diego, Bugnet, Lisa, Campante, Tiago L., Orhan, Zeynep Çelik, Corsaro, Enrico, González-Cuesta, Lucía, Davies, Guy R., Di Mauro, Maria Pia, Egeland, Ricky, Elsworth, Yvonne P., Gaulme, Patrick, Ghasemi, Hamed, Guo, Zhao, Hall, Oliver J., Hasanzadeh, Amir, Hekker, Saskia, Howe, Rachel, Jenkins, Jon M., Jiménez, Antonio, Kiefer, René, Kuszlewicz, James S., Kallinger, Thomas, Latham, David W., Lundkvist, Mia S., Mathur, Savita, Montalbán, Josefina, Mosser, Benoit, Bedón, Andres Moya, Nielsen, Martin Bo, Örtel, Sibel, Rendle, Ben M., Ricker, George R., Rodrigues, Thaíse S., Roxburgh, Ian W., Safari, Hossein, Schofield, Mathew, Seager, Sara, Smalley, Barry, Stello, Dennis, Szabó, Róbert, Tayar, Jamie, Themeßl, Nathalie, Thomas, Alexandra E. L., Vanderspek, Roland K., van Rossem, Walter E., Vrard, Mathieu, Weiss, Achim, White, Timothy R., Winn, Joshua N., Yıldız, Mutlu

Over the course of its history, the Milky Way has ingested multiple smaller satellite galaxies. While these accreted stellar populations can be forensically identified as kinematically distinct structures within the Galaxy, it is difficult in general

Externí odkaz: http://arxiv.org/abs/2001.04653

Asteroseismic inversions for radial differential rotation of Sun-like stars: ensemble fits

Autor: Schunker, Hannah, Schou, Jesper, Ball, Warrick, Nielsen, Martin Bo, Gizon, Laurent

Publikováno v: A&A 586, A79 (2016)

Radial differential rotation is an important parameter for stellar dynamo theory and for understanding angular momentum transport. We investigate the potential of using a large number of similar stars simultaneously to constrain their average radial

Externí odkaz: http://arxiv.org/abs/1512.07169

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