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The Astrophysical Journal Letters (ApJL)

Resumen/Descripción – provisto por la editorial en inglés

The Astrophysical Journal Letters is an open access express scientific journal that allows astrophysicists to rapidly publish short notices of significant original research. ApJL articles are timely, high-impact, and broadly understandable.

Palabras clave – provistas por la editorial

astronomy; astrophysics

Disponibilidad

Institución detectada	Período	Navegá	Descargá	Solicitá
No detectada	desde ene. 2010 / hasta dic. 2023	IOPScience

Información

Tipo de recurso:

revistas

ISSN impreso

2041-8205

ISSN electrónico

2041-8213

Editor responsable

American Astronomical Society (AAS)

Idiomas de la publicación

inglés

País de edición

Reino Unido

Información sobre licencias CC

https://creativecommons.org/licenses/by/4.0/

Cobertura temática

Ciencias físicas

Tabla de contenidos

doi: 10.3847/2041-8213/ab321b

Self-lensing Discovery of a 0.2 M_⊙ White Dwarf in an Unusually Wide Orbit around a Sun-like Star^∗

Kento Masuda; Hajime Kawahara; David W. Latham; Allyson Bieryla; Masanobu Kunitomo; Morgan MacLeod; Wako Aoki

<jats:title>Abstract</jats:title> <jats:p>We report the discovery of the fifth self-lensing binary in which a low-mass white dwarf (WD) gravitationally magnifies its 15th magnitude G-star companion, KIC 8145411, during eclipses. The system was identified from a pair of such self-lensing events in the <jats:italic>Kepler</jats:italic> photometry, and was followed up with the Tillinghast Reflector Echelle Spectrograph (TRES) on the 1.5 m telescope at the Fred Lawrence Whipple Observatory and the High-Dispersion Spectrograph (HDS) on the Subaru 8.2 m telescope. A joint analysis of the TRES radial velocities, the HDS spectrum, and the <jats:italic>Kepler</jats:italic> photometry of the primary star determines the WD mass 0.20 ± 0.01 <jats:italic>M</jats:italic> <jats:sub>⊙</jats:sub>, orbital semimajor axis 1.28 ± 0.03 au, and orbital eccentricity 0.14 ± 0.02. Because such extremely low-mass WDs cannot be formed in isolation within the age of the Galaxy, their formation is believed to involve binary interactions that truncated evolution of the WD progenitor. However, the observed orbit of the KIC 8145411 system is at least 10 times wider than required for this scenario to work. The presence of this system in the <jats:italic>Kepler</jats:italic> sample, along with its similarities to field blue straggler binaries presumably containing WDs, may suggest that some 10% of post-asymptotic giant branch binaries with Sun-like primaries contain such anomalous WDs.</jats:p>