The fastest unbound star in our Galaxy ejected by a thermonuclear supernova
arXiv:1503.01650 · doi:10.1126/science.1259063
Abstract
Hypervelocity stars (HVS) travel with velocities so high, that they exceed the escape velocity of the Galaxy. Several acceleration mechanisms have been discussed. Only one HVS (US 708, HVS 2) is a compact helium star. Here we present a spectroscopic and kinematic analysis of US\,708. Travelling with a velocity of , it is the fastest unbound star in our Galaxy. In reconstructing its trajectory, the Galactic center becomes very unlikely as an origin, which is hardly consistent with the most favored ejection mechanism for the other HVS. Furthermore, we discovered US\,708 to be a fast rotator. According to our binary evolution model it was spun-up by tidal interaction in a close binary and is likely to be the ejected donor remnant of a thermonuclear supernova.
16 pages report, 20 pages supplementary materials
References in corpus (10)
- Double-detonation sub-Chandrasekhar supernovae: can minimum helium shell masses detonate the core?
- A selection of hot subluminous stars in the GALEX survey II. Subdwarf atmospheric parameters
- Hot subdwarfs from the ESO Supernova Ia Progenitor Survey: II. Atmospheric parameters of subdwarf O stars
- The hot subdwarf B + white dwarf binary KPD 1930+2752 - a Supernova Type Ia progenitor candidate
- An Alternative Origin for Hypervelocity Stars
- On type Ia supernovae and the formation of single low-mass white dwarfs
- Runaway and hypervelocity stars in the Galactic halo: Binary rejuvenation and triple disruption
- Abundance analyses of helium-rich subluminous B stars
- Hyperfast pulsars as the remnants of massive stars ejected from young star clusters
- Double degenerates and progenitors of supernovae type Ia
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- The OmegaWhite survey for short-period variable stars - V. Discovery of an ultracompact hot subdwarf binary with a compact companion in a 44 minute orbit
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- Masses of White Dwarf Binary Companions to Type Ia Supernovae Measured from Runaway Velocities
- The Evolution of Helium Star Plus Carbon-Oxygen White Dwarf Binary Systems and Implications for Diverse Stellar Transients and Hypervelocity Stars
- Velocity limits in the thermonuclear supernova ejection scenario for hypervelocity stars and the origin of US 708
- Hyper-runaway and hypervelocity white dwarf candidates in \textit{Gaia} Data Release 3: possible remnants from Ia/Iax supernova explosions or dynamical encounters
- Mergers of Equal-Mass Binaries with Compact Object Companions from Mass Transfer in Triple Star Systems
- Discovery of A candidate Hypervelocity star originated from the Sagittarius Dwarf Spheroidal galaxy
- Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. II. Kinematics
- Evolution of Helium Star - White Dwarf Binaries Leading up to Thermonuclear Supernovae
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- A Roche Lobe-filling hot Subdwarf and White Dwarf Binary: possible detection of an ejected common envelope
- 60 candidate high-velocity stars originating from the Sagittarius dwarf spheroidal galaxy in Gaia EDR3
- Long-term evolution of surviving companion stars of Type Iax supernovae
- Searching for Hot Subdwarf Stars in LAMOST DR1-II. Pure spectroscopic identification method for hot subdwarfs
- High-speed stars. II. An unbound star, young stars, bulge metal-poor stars, and Aurora candidates
- Predicted spatial and velocity distributions of ejected companion stars of helium accretion-induced thermonuclear supernovae
- Candidate Hypervelocity Red Clump Stars in the Galactic Bulge Found Using the VVV and Gaia Surveys
- He-star donor AM CVn stars and their progenitors as LISA sources
- Runaway Dwarf Carbon Stars as Candidate Supernova Ejecta
- Evolution models of helium white dwarf--main-sequence star merger remnants: the mass distribution of single low-mass white dwarfs
- High-velocity feature as the indicator of the stellar population of Type Ia supernovae
- Deep and fast Solar System flybys: The controversial case of WD 0810-353
- Three New Late-type Hypervelocity Star Candidates from Gaia DR2 with Refined Selection Criteria
- Producing type Ia supernovae from hybrid CONe white dwarfs with main-sequence binary companions at low metallicity of Z = 0.0001
- Discovery of a runaway star likely ejected by a Type Iax Supernova
- Observational signatures of the surviving donor star in the double detonation model of Type Ia supernovae
- Stars on the ascending helium giant branch I. From white dwarf merger to helium giant: the evolutionary state of the rapidly rotating hot subdwarf HE 1518-0948
- Hot subdwarfs from the surviving companions of the white dwarf + main-sequence channel of Type Ia supernovae