The Blue Lurker WOCS 14020: A Long-Period Post-Common-Envelope Binary in M67 Originating from a Merger in a Triple System
arXiv:2507.08122 · doi:10.3847/2041-8213/ad9d0c
Abstract
We present Hubble Space Telescope far-ultraviolet (FUV) spectra of a blue-lurkerwhite-dwarf (BL-WD) binary system in the 4 Gyr open cluster M67. We fit the FUV spectrum of the WD, determining it is a C/O WD with a mass of M and a cooling age of Myr. This requires a WD progenitor of M, significantly larger than the current cluster turnoff mass of 1.3 M. We suggest the WD progenitor star formed several hundred Myr ago via the merger of two stars near the turnoff of the cluster. In this scenario, the original progenitor system was a hierarchical triple consisting of a close, near-equal-mass inner binary, with a tertiary companion with an orbit of a few thousand days. The WD is descended from the merged inner binary, and the original tertiary is now the observed BL. The likely formation scenario involves a common envelope while the WD progenitor is on the AGB, and thus the observed orbital period of 359 days requires an efficient common envelope ejection. The rapid rotation of the BL indicates it accreted some material during its evolution, perhaps via a wind prior to the common envelope. This system will likely undergo a second common envelope in the future, and thus could result in a short-period double WD binary or merger of a 0.72 M C/O WD and a 0.38 Helium WD, making this a potential progenitor of an interesting transient such as a sub-Chandrasekhar Type Ia supernova.
13 pages, 3 figures. Published in ApJL, January 2025
References in corpus (77)
- Array Programming with NumPy
- Astropy: A Community Python Package for Astronomy
- emcee: The MCMC Hammer
- Evolution of binary stars and the effect of tides on binary populations
- A Survey of Stellar Families: Multiplicity of Solar-Type Stars
- Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
- The Optical to Mid-Infrared Extinction Law Based on the APOGEE, Gaia DR2, Pan-STARRS1, SDSS, APASS, 2MASS and WISE Surveys
- An Improved Spectroscopic Analysis of DA White Dwarfs from the Sloan Digital Sky Survey Data Release 4
- Tertiary companions to close spectroscopic binaries
- COSMIC Variance in Binary Population Synthesis
- Post-common-envelope binaries from SDSS. IX: Constraining the common-envelope efficiency
- A Circumbinary Disk in the Final Stages of Common Envelope and the Core-Degenerate Scenario for Type Ia Supernovae
- Theoretical uncertainties of the type Ia supernova rate
- On the triple origin of blue stragglers
- New evolutionary sequences for extremely low mass white dwarfs: Homogeneous mass and age determinations, and asteroseismic prospects
- A Complete N-body Model of the Old Open Cluster M67
- Mergers and Obliquities in Stellar Triples
- Calcium-rich gap transients in the remote outskirts of galaxies
- On the alpha formalism for the common envelope interaction
- Efficiency of mass transfer in massive close binaries, Tests from double-lined eclipsing binaries in the SMC
- A Binary Origin for Blue Stragglers in Globular Clusters
- Type Ia Supernova Explosions in Binary Systems: A Review
- The effect of common-envelope evolution on the visible population of post-common-envelope binaries
- Mass Transfer from Giant Donors
- Rotation periods for cool stars in the 4 Gyr-old open cluster M67, the solar-stellar connection, and the applicability of gyrochronology to at least solar age
- Towards precise stellar ages: combining isochrone fitting with empirical gyrochronology
- Stellar Radial Velocities in the Old Open Cluster M67 (NGC 2682) I. Memberships, Binaries, and Kinematics
- Orbital properties of binary post-AGB stars
- Mass transfer from a giant star to a main sequence companion and its contribution to long-orbital-period blue stragglers
- Monte Carlo simulations of post-common-envelope white dwarf + main sequence binaries: comparison with the SDSS DR7 observed sample
- Interacting Binaries with Eccentric Orbits. Secular Orbital Evolution Due To Conservative Mass Transfer
- Orbital eccentricities of binary systems with a former AGB star
- Blue Stragglers as Stellar Collision Products: the Angular Momentum Question
- Deep 2MASS Photometry of M67 and Calibration of the Main Sequence J-Ks Color Difference as an Age Indicator
- Adiabatic mass loss in binary stars. III. From the base of the red giant branch to the tip of asymptotic giant branch
- Orbital Evolution of Binaries in Circumbinary Disks
- An Analytic Technique for Constraining the Dynamical Origins of Multiple Star Systems Containing Merger Products
- Interacting Binaries with Eccentric Orbits II. Secular Orbital Evolution Due To Non-Conservative Mass Transfer
- Implications for the Formation of Blue Straggler Stars from HST Ultraviolet Observations of NGC 188
- Detection of white dwarf companions to blue stragglers in the open cluster NGC 188: direct evidence for recent mass transfer
- The K2 M67 Study: Revisiting old friends with K2 reveals oscillating red giants in the open cluster M67
- Barium & related stars and their white-dwarf companions II. Main-sequence and subgiant stars
- Stellar triples on the edge; Comprehensive overview of the evolution of destabilised triples leading to stellar and binary exotica
- Coping with loss: Stability of mass transfer from post-main sequence donor stars
- ZTF 18aaqeasu (SN 2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar Mass White Dwarf
- Blue Lurkers: Hidden Blue Stragglers on the M67 Main Sequence Identified from their Kepler/K2 Rotation Periods
- Can We Trust Models for Adiabatic Mass Loss?
- Interacting Binaries with Eccentric Orbits. III. Orbital Evolution due to Direct Impact and Self-Accretion
- The Blue Straggler RS CVn Star S1082 in M67: A Detailed Light Curve and the Possibility of a Triple
- S1040 in M67: A Post-Mass-Transfer Binary with a Helium-Core White Dwarf
- White dwarf binaries suggest a common envelope efficiency
- Discovery of three self-lensing binaries from Kepler
- Common Envelope Evolution on a Moving Mesh
- Formation of Extremely Low-mass White Dwarfs Binaries
- UVIT Open Cluster Study. II. Detection of extremely low mass white dwarfs and post-mass transfer binaries in M67
- Stellar Radial Velocities in the Old Open Cluster M67 (NGC 2682). II. The Spectroscopic Binary Population
- Binary coalescence from case A evolution -- mergers and blue stragglers
- UVIT Open Cluster Study. I. Detection of a White Dwarf Companion to a Blue Straggler in M67: Evidence of Formation through Mass Transfer
- A Census of Blue Stragglers in Gaia DR2 Open Clusters as a Test of Population Synthesis and Mass Transfer Physics
- The Response of Giant Stars To Dynamical-Timescale Mass Loss
- Long-term Evolution of Binary Orbits Induced by Circumbinary Disks
- The K2 M67 Study: An Evolved Blue Straggler in M67 from K2 Mission Asteroseismology
- Constraining Mass Transfer Histories of Blue Straggler Stars with COS Spectroscopy of White Dwarf Companions
- Wide post-common envelope binaries from Gaia: orbit validation and formation models
- Evolution and final fate of massive post-common-envelope binaries
- The blue straggler V106 in NGC6791: A prototype progenitor of old single giants masquerading as young
- WOCS 5379: Detailed Analysis of the Evolution of a Post-Mass-Transfer Blue Straggler
- WIYN Open Cluster Study. LXXXVII. HST Ultraviolet Detection of Hot White Dwarf Companions to Blue Lurkers in M67
- UOCS-VIII. UV Study of the open cluster NGC 2506 using ASTROSAT
- Late-time Observations of Calcium-Rich Transient SN 2019ehk Reveal a Pure Radioactive Decay Power Source
- Ensemble Properties of the White Dwarf Population of the Old, Solar Metallicity Open Star Cluster Messier 67
- Dynamical He Flashes in Double White Dwarf Binaries
- WOCS 4540: Detailed Analysis of a Very Long Orbital Period Blue Straggler
- Formation of long-period post-common-envelope binaries II. Explaining the self-lensing binary KOI 3278
- Stellar Triples as a Source for Ba Stars
- The White Dwarfs of the Old, Solar Metallicity Open Star Cluster Messier 67: Properties and Progenitors
- No longer impossible: the self-lensing binary KIC 8145411 is a triple