A Deficit of Massive White Dwarfs in Gaia Astrometric Binaries

Abstract

The third data release of Gaia introduced a large catalog of astrometric binaries, out of which about 3,200 are likely main-sequence stars with a white-dwarf (WD) companion. These binaries are typically found with orbital separations of ~1 AU, a separation range that was largely unexplored due to observational challenges. Such systems are likely to have undergone a phase of stable mass transfer while the WD progenitor was on the asymptotic giant branch. Here we study the WD mass distribution of a volume-complete sample of binaries with K/M-dwarf primaries and orbital separations ~1 AU. We find that the number of massive WDs relative to the total number of WDs in these systems is smaller by an order of magnitude compared to their occurrence among single WDs in the field. One possible reason can be an implicit selection of the WD mass range if these are indeed post-stable-mass-transfer systems. Another reason can be the lack of merger products in our sample compared to the field, due to the relatively tight orbital separations of these systems. In addition, we find that about 14% of these systems have distant tertiary companions within 1 pc.

Submitted to ApJL, revised version

References in corpus (33)

• The NumPy array: a structure for efficient numerical computation
• The Gaia mission
• Gaia Data Release 3: Summary of the content and survey properties
• A million binaries from Gaia eDR3: sample selection and validation of Gaia parallax uncertainties
• The frequency of planetary debris around young white dwarfs
• A catalogue of white dwarfs in Gaia EDR3
• Gaia Data Release 3: Stellar multiplicity, a teaser for the hidden treasure
• New white dwarf stars in the Sloan Digital Sky Survey Data Release 10
• On the Measurement of Fundamental Parameters of White Dwarfs in the Gaia Era
• The 100 pc White Dwarf Sample in the SDSS Footprint
• Gaia Data Release 3. Astrometric binary star processing
• White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14
• $Gaia$ white dwarfs within 40 pc II: the volume-limited northern hemisphere sample
• Observationally driven Galactic double white dwarf population for LISA
• Orbital eccentricities of binary systems with a former AGB star
• The 40 pc sample of white dwarfs from Gaia
• $\text{Gaia}$ white dwarfs within 40 pc I: spectroscopic observations of new candidates
• Testing eccentricity pumping mechanisms to model eccentric long period sdB binaries with MESA
• Spectral classification of the 100 pc white dwarf population from Gaia-DR3 and the Virtual Observatory
• Triage of the Gaia DR3 astrometric orbits. I. A sample of binaries with probable compact companions
• $\text{Gaia}$ white dwarfs within 40 pc III: spectroscopic observations of new candidates in the southern hemisphere
• A Spectro-photometric Analysis of Cool White Dwarfs in the Gaia and Pan-STARRS Footprint
• Triage of Astrometric Binaries - how to find triple systems and dormant black-hole secondaries in the Gaia orbits
• The Merger Fraction of Ultramassive White Dwarfs
• White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 16
• A population synthesis fitting of the $Gaia$ resolved white dwarf binary population within 100 pc
• Barium and related stars, and their white-dwarf companions. III. The masses of the white dwarfs
• Asteroseismological analysis of the ultra-massive ZZ Ceti stars BPM~37093, GD~518, and SDSS~J0840+5222
• The Cooling of Massive White Dwarfs from Gaia EDR3
• Probable Dormant Neutron Star in a Short-Period Binary System
• The White Dwarf Binary Pathways Survey -- IX. Three long period white dwarf plus subgiant binaries
• The White Dwarf Binary Pathways Survey VII: Evidence for a bi-modal distribution of post mass transfer systems?
• White dwarf binaries Across the H-R Diagram

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• A magnitude-limited catalogue of unresolved white dwarf-main sequence binaries from Gaia DR3
• Gaia Barium Dwarfs and Their Ostensibly Ordinary Counterparts
• White dwarf eccentricity fluctuation and dissipation by AGB convection
• Cataclysmic Variable Candidates Identified in eROSITA-DE DR1,XMM-Newton, Swift, and ROSAT Catalogs
• IK Pegasi and the Double-merger Path to Type Ia Supernovae
• Discovery and Characterization of White Dwarf-FGK Main-Sequence Binaries within the Optical Main-Sequence Locus