Discovery and characterization of five new eclipsing AM CVn systems
J. van Roestel,Thomas Kupfer,M. J. Green,S Wong,Lars Bildsten,Lars Bildsten,Kevin B. Burdge,T. A. Prince,T. R. Marsh,Paula Szkody,Christoffer Fremling,Matthew J. Graham,V. S. Dhillon,V. S. Dhillon,S. P. Littlefair,Eric C. Bellm,Michael W. Coughlin,Dmitry A. Duev,David Goldstein,R. R. Laher,B. Rusholme,Reed Riddle,Richard Dekany,S. R. Kulkarni +23 more
TLDR
In this paper, the authors reported the discovery of five new eclipsing AM CVn systems with orbital periods of 61.5, 55.3, 37.4, and 35.4 minutes by searching for deep eclipses in the Zwicky Transient Facility (ZTF) lightcurves of white dwarfs.Abstract:
AM CVn systems are ultra-compact, helium-rich, accreting binaries with degenerate or semi-degenerate donors. We report the discovery of five new eclipsing AM CVn systems with orbital periods of 61.5, 55.5, 53.3, 37.4, and 35.4 minutes. These systems were discovered by searching for deep eclipses in the Zwicky Transient Facility (ZTF) lightcurves of white dwarfs selected using Gaia parallaxes. We obtained phase-resolved spectroscopy to confirm that all systems are AM CVn binaries, and we obtained high-speed photometry to confirm the eclipse and characterize the systems. The spectra of two long-period systems (61.5 and 53.3 minutes) show many emission and absorption lines, indicating the presence of N, O, Na, Mg, Si, and Ca, and also the K and Zn, elements which have never been detected in AM CVn systems before. By modelling the high-speed photometry, we measured the mass and radius of the donor star, potentially constraining the evolutionary channel that formed these AM CVn systems. We determined that the average mass of the accreting white dwarf is $\approx0.8$$\mathrm{M_{\odot}}$, and that the white dwarfs in long-period systems are hotter than predicted by recently updated theoretical models. The donors have a high entropy and are a factor of $\approx$ 2 more massive compared to zero-entropy donors at the same orbital period. The large donor radius is most consistent with He-star progenitors, although the observed spectral features seem to contradict this. The discovery of 5 new eclipsing AM~CVn systems is consistent with the known observed AM CVn space density and estimated ZTF recovery efficiency. Based on this estimate, we expect to find another 1--4 eclipsing AM CVn systems as ZTF continues to obtain data. This will further increase our understanding of the population, but will require high precision data to better characterize these 5 systems and any new discoveries.read more
Citations
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HiPERCAM: a quintuple-beam, high-speed optical imager on the 10.4-m Gran Telescopio Canarias
V. S. Dhillon,V. S. Dhillon,Naidu Bezawada,Martin Black,S D Dixon,T. Gamble,Xiaofeng Gao,David Henry,P. Kerry,S. P. Littlefair,David Lunney,T. R. Marsh,C Miller,Steven G. Parsons,Richard Ashley,Elmé Breedt,A. J. Brown,Martin J. Dyer,M. J. Green,Ingrid Pelisoli,D. I. Sahman,Jim M. Wild,D. Ives,Leander Mehrgan,J. Stegmeier,Cornelis M. Dubbeldam,Tim Morris,James Osborn,Richard Wilson,J. Casares,J. Casares,T. Muñoz-Darias,T. Muñoz-Darias,Enric Palle,Enric Palle,Pablo Rodríguez-Gil,Pablo Rodríguez-Gil,T. Shahbaz,T. Shahbaz,Manuel A. P. Torres,Manuel A. P. Torres,A. de Ugarte Postigo,Antonio Cabrera-Lavers,Romano L. M. Corradi,R D Domínguez,D. Garcia-Alvarez +45 more
TL;DR: HiPERCAM as mentioned in this paper is a portable, quintuple-beam optical imager that saw first light on the 10.4m Gran Telescopio Canarias (GTC) in 2018.
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Formation of the Double White Dwarf Binary PTF J0533+0209 through Stable Mass Transfer?
TL;DR: In this article , the formation of double white dwarf (DWD) binaries is discussed and the possible formation scenarios of this binary and argue that it is not likely to have formed through CE evolution.
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Four new deeply-eclipsing white dwarfs in ZTF
TL;DR: In this article , the results of a search for deeply-eclipsing white dwarfs in the ZTF Data Release 4.5 were presented, and the authors identified nine deeply eclipsing white dwarf candidates, four of which were followed up with high-cadence photometry and spectroscopy.
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Evolution of AM CVn Binaries with White Dwarf Donors
TL;DR: In this paper , the authors have modeled the evolution of double white dwarf (WD) binaries with accretor masses of 0.50 −1.30 M and donor masses of 1.17 −0.45 M using the detailed stellar evolution code mesa.
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The Fast Evolving, Tremendous Blue Superoutburst in ASASSN-21au Reveals a Dichotomy in the Outbursts of Long-period AM CVns
TL;DR: In this article , an ultracompact accreting white dwarf binary (AM CVn) with a period of approx. 58 min was used to study the behavior of outbursts in AM CVns.
References
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Posted Content
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TL;DR: In this paper, a 3D global magnetohydrodynamic (MHD) simulation of an AM CVn system was presented, which was aimed at exploring eccentricity growth in the accretion disc self-consistently from a first principles treatment of the MHD turbulence.
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