Article
Astronomy & Astrophysics
N. P. Gentile Fusillo, C. J. Manser, Boris T. Gaensicke, O. Toloza, D. Koester, E. Dennihy, W. R. Brown, J. Farihi, M. A. Hollands, M. J. Hoskin, P. Izquierdo, T. Kinnear, T. R. Marsh, A. Santamaria-Miranda, A. F. Pala, S. Redfield, P. Rodriguez-Gil, M. R. Schreiber, Dimitri Veras, D. J. Wilson
Summary: A survey of planetary remnants using a large number of white dwarfs identified six white dwarfs with gaseous debris discs, highlighting the unique features of three systems. These discoveries shed light on the underlying diversity in gaseous debris disc systems and bring the total number of these objects to 21.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Marc G. Brouwers, Amy Bonsor, Uri Malamud
Summary: White dwarf pollution is mainly caused by tidal disruption of scattered asteroids and accretion of fragments. Differences in the fragmentation rate of large and small asteroids lead to varying dust production rates, requiring enhanced drag forces for circularization.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Christopher E. O'Connor, Jean Teyssandier, Dong Lai
Summary: This study investigates the phenomenon of secular chaos in multiplanet systems through numerical simulations, focusing on the relationship between the properties of the planets and the time-scale and efficiency of chaotic diffusion. The authors find that secular chaos can lead to extreme eccentricities in certain systems. Additionally, they apply their findings to the evolution of planetary systems around white dwarfs and suggest that secular chaos can be a significant channel for polluting solitary white dwarfs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Philippe Z. Yao, Eliot Quataert, Andy Goulding
Summary: Many double white dwarf mergers do not result in immediate thermonuclear explosions. The survivors of these mergers, particularly those involving double Carbon-Oxygen white dwarfs, can be observed for approximately 10,000 years and appear similar to massive white dwarfs evolving from extreme AGB stars. Detecting these merger remnants is easiest in galaxies with high-stellar masses and low star formation rates. Identifying them photometrically is challenging as they resemble He stars and post-outburst classical novae, but their unusual surrounding photoionized nebulae could be a promising technique for detection.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Simon Blouin, Siyi Xu
Summary: Recent studies show that the mass accretion rates of cool, old white dwarfs do not significantly decrease over several billion years of cooling time, indicating the need for mechanisms to consistently deliver planetesimals inside the Roche radius of white dwarfs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Andrew Swan, Scott J. Kenyon, Jay Farihi, Erik Dennihy, Boris T. Gansicke, J. J. Hermes, Carl Melis, Ted von Hippel
Summary: WD0145+234 is a white dwarf accreting metals from a circumstellar disc, with a significant increase in 3-5 μm flux since 2018 that began to decrease by late 2019. Stochastic brightening events during the decline suggest liberation of dust during collisional evolution of circumstellar solids. Emission lines from circumstellar gas support the idea of white dwarf debris discs as sites of collisional gas and dust production.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
C. S. Jeffery, K. Werner, D. Kilkenny, B. Miszalski, I Monageng, E. J. Snowdon
Summary: The Southern African Large Telescope survey has discovered and analyzed eight new very hot white dwarfs and pre-white dwarfs, with effective temperatures exceeding 100,000 K, including two PG1159 stars, one DO white dwarf, three O(He) stars, and two O(H) stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Alfred Curry, Amy Bonsor, Tim Lichtenberg, Oliver Shorttle
Summary: Short-lived radioisotopes, such as Al-26, played a crucial role in the formation of planetary bodies, providing additional heat source and leading to melting and iron core formation. The prevalence of these radioisotopes in exoplanetary systems is important for understanding volatile budget and atmospheric diversity. White dwarfs that have accreted planetary material offer a unique opportunity to study iron core formation in extrasolar planetesimals. Based on the evidence from white dwarfs, a significant fraction of exoplanetesimals are likely to have formed an iron core.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Katja Stock, Dimitri Veras, Maxwell X. Cai, Rainer Spurzem, Simon Portegies Zwart
Summary: This study uses stellar cluster simulations to investigate the orbital architectures of planetary systems containing super-Earths. The results show that approximately 30% of simulated planets may generate sufficient eccentricities to pollute the atmospheres of white dwarfs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
R. F. Maldonado, E. Villaver, A. J. Mustill, M. Chavez, E. Bertone
Summary: The study explores the origin of close-in planets orbiting white dwarfs, suggesting that the higher the multiplicity of the planetary system, the more likely it is to experience dynamical instability. This can lead to planets passing through close periastron passages.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Lin Wang, Xiaoxia Zhang, Junfeng Wang, Zhi-Xiang Zhang, Taotao Fang, Wei-Min Gu, Jincheng Guo, Xiaochuan Jiang
Summary: Infrared (IR) excess is an important tool to study substellar companions and debris disks around white dwarfs (WDs). In this study, we cross-correlate the LAMOST WD catalog with other surveys and identify 50 candidates with IR excess, including WD+M dwarf binaries, WD+brown dwarf binaries, and WD+dust disk systems. This survey provides a significant complement to the current database of WDs with candidate BD companions and dust disks. Follow-up observations are needed for confirmation.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Mary Anne Limbach, Andrew Vanderburg, Kevin B. Stevenson, Simon Blouin, Caroline Morley, Jacob Lustig-Yaeger, Melinda Soares-Furtado, Markus Janson
Summary: The James Webb Space Telescope (JWST) can detect infrared excess from the blended light of terrestrial exoplanets orbiting white dwarfs. It is capable of detecting warm Earths, super-Earths, and hot Mercury analogues, as well as cold Jupiter-sized exoplanets. These observations provide valuable information about the atmospheres of these planets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
N. Walters, J. Farihi, T. R. Marsh, S. Bagnulo, J. D. Landstreet, J. J. Hermes, N. Achilleos, A. Wallach, M. Hart, C. J. Manser
Summary: Despite limited detections of Balmer emission lines in white dwarfs, the study of these emission features reveals variations in strength and potential evolution of the emission region. While some proposed models may face challenges in explaining these observations, the data suggests that the chromospheric emission in these white dwarfs may be intrinsic.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
D. Souropanis, A. Chiotellis, P. Boumis, D. Jones, S. Akras
Summary: The presence of inflated binary companions to central stars of planetary nebulae (PNe) suggests the occurrence of accretion onto the central star during the PN phase. This study investigates the impact of a steadily accreting white dwarf (WD) on the properties and evolution of a PN. The results show that accreting WDs can form extended, high excitation, [OIII]-bright PNe with invariant properties over time and longer visibility time compared to PNe powered by single WDs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
R. F. Maldonado, E. Villaver, A. J. Mustill, M. Chavez
Summary: Planets orbiting intermediate- and low-mass stars face jeopardy as their stellar hosts evolve to white dwarfs due to changes in the dynamics of the planetary system. N-body simulations show that the more planets a system has, the more likely it becomes unstable when the star becomes a white dwarf. Additionally, simulations with low-mass planets lose fewer planets compared to simulations with high-mass planets, which tend to become unstable shortly after the formation of the white dwarf.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
Edward D. Young, Issaku E. Kohl, Paul H. Warren, David C. Rubie, Seth A. Jacobson, Alessandro Morbidelli
Article
Meteorology & Atmospheric Sciences
Laurence Y. Yeung, Lee T. Murray, Jeanine L. Ash, Edward D. Young, Kristie A. Boering, Elliot L. Atlas, Sue M. Schauffler, Richard A. Lueb, Ray L. Langenfelds, Paul. B. Krummel, L. Paul Steele, Sebastian D. Eastham
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2016)
Article
Geochemistry & Geophysics
E. D. Young, I. E. Kohl, B. Sherwood Lollar, G. Etiope, D. Rumble, S. Li, M. A. Haghnegahdar, E. A. Schauble, K. A. McCain, D. I. Foustoukos, C. Sutclife, O. Warr, C. J. Ballentine, T. C. Onstott, H. Hosgormez, A. Neubeck, J. M. Marques, I. Perez-Rodriguez, A. R. Rowe, D. E. LaRowe, C. Magnabosco, L. Y. Yeung, J. L. Ash, L. T. Bryndzia
GEOCHIMICA ET COSMOCHIMICA ACTA
(2017)
Article
Environmental Sciences
Mojhgan A. Haghnegahdar, Edwin A. Schauble, Edward D. Young
GLOBAL BIOGEOCHEMICAL CYCLES
(2017)
Editorial Material
Multidisciplinary Sciences
Edward D. Young
Article
Multidisciplinary Sciences
Laurence Y. Yeung, Shuning Li, Issaku E. Kohl, Joshua A. Haslun, Nathaniel E. Ostrom, Huanting Hu, Tobias P. Fischer, Edwin A. Schauble, Edward D. Young
Article
Multidisciplinary Sciences
Melanie Barboni, Patrick Boehnke, Brenhin Keller, Issaku E. Kohl, Blair Schoene, Edward D. Young, Kevin D. McKeegan
Review
Astronomy & Astrophysics
J. Monteux, G. J. Golabek, D. C. Rubie, G. Tobie, E. D. Young
SPACE SCIENCE REVIEWS
(2018)
Article
Geochemistry & Geophysics
Thomas Giunta, Edward D. Young, Oliver Warr, Issaku Kohl, Jeanine L. Ash, Anna Martini, Scott O. C. Mundle, Douglas Rumble, Ileana Perez-Rodriguez, Mark Wasley, Douglas E. LaRowe, Alexis Gilbert, Barbara Sherwood Lollar
GEOCHIMICA ET COSMOCHIMICA ACTA
(2019)
Article
Geochemistry & Geophysics
Michelle K. Jordan, HaoLan Tang, Issaku E. Kohl, Edward D. Young
GEOCHIMICA ET COSMOCHIMICA ACTA
(2019)
Article
Geochemistry & Geophysics
J. I. Simon, M. K. Jordan, M. J. Tappa, E. A. Schauble, I. E. Kohl, E. D. Young
EARTH AND PLANETARY SCIENCE LETTERS
(2017)
Article
Geochemistry & Geophysics
J. Isa, I. E. Kohl, M. -C. Liu, J. T. Wasson, E. D. Young, K. D. McKeegan
Article
Astronomy & Astrophysics
Nathaniel N. Monson, Mark R. Morris, Edward D. Young
ASTROPHYSICAL JOURNAL
(2017)
Article
Astronomy & Astrophysics
S. Xu, B. Zuckerman, P. Dufour, E. D. Young, B. Klein, M. Jura
ASTROPHYSICAL JOURNAL LETTERS
(2017)
Article
Astronomy & Astrophysics
Edward D. Young
ASTROPHYSICAL JOURNAL
(2016)