A Model of the Pulsating Extremely Low-mass White Dwarf Precursor WASP 0247–25B

Istrate, Alina G.; Fontaine, G.; Heuser, Christian

doi:10.3847/1538-4357/aa8958

Cited by 12 publications

(14 citation statements)

References 41 publications

(87 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Very interesting research about the evolutionary and pulsational properties of WASP 0247−25B, a pre-ELMV star component of the double-lined eclipsing system WASP 0247−25, was presented by Istrate et al (2017). Maxted et al (2013) provided fundamental parameters of this star at a unique level of precision.…”

Section: Elmv and Pre-elmv Starsmentioning

confidence: 99%

“…Maxted et al (2013) provided fundamental parameters of this star at a unique level of precision. By employing state-of-the-art evolutionary models that take into account rotational mixing and diffusion processes along with a comprehensive stability pulsation analysis, Istrate et al (2017) were able to find a stellar model that closely reproduces observed properties of the star such as stellar mass, orbital period, surface gravity, effective temperature, surface chemical composition, and also the pulsation periods detected in the star. This reinforces the validity of the pre-ELM WD models of Istrate et al (2016a) that incorporate rotational mixing.…”

Section: Elmv and Pre-elmv Starsmentioning

confidence: 99%

See 1 more Smart Citation

Pulsating white dwarfs: new insights

Córsico

Althaus

Bertolami

et al. 2019

Astron Astrophys Rev

194

224

View full text Add to dashboard Cite

Stars are extremely important astronomical objects that constitute the pillars on which the Universe is built, and as such, their study has gained increasing interest over the years. White dwarf stars are not the exception. Indeed, these stars constitute the final evolutionary stage for more than 95 per cent of all stars. The Galactic population of white dwarfs conveys a wealth of information about several fundamental issues and are of vital importance to study the structure, evolution and chemical enrichment of our Galaxy and its components -including the star formation history of the Milky Way. Several important studies have emphasized the advantage of using white dwarfs as reliable clocks to date a variety of stellar populations in the solar neighborhood and in the nearest stellar clusters, including the thin and thick disks, the Galactic spheroid and the system of globular and open clusters. In addition, white dwarfs are tracers of the evolution of planetary systems along several phases of stellar evolution. Not less relevant than these applications, the study of matter at high densities has benefited from our detailed knowledge about evolutionary and observational properties of white dwarfs. In this sense, white dwarfs are used as laboratories for astro-particle physics, being their interest focused on physics beyond the standard model, that is, neutrino physics, axion physics and also radiation from "extra dimensions", and even crystallization.The last decade has witnessed a great progress in the study of white dwarfs. In particular, a wealth of information of these stars from different surveys has

show abstract

Section: Elmv and Pre-elmv Starsmentioning

confidence: 99%

Section: Elmv and Pre-elmv Starsmentioning

confidence: 99%

Pulsating white dwarfs: new insights

Córsico

Althaus

Bertolami

et al. 2019

Astron Astrophys Rev

194

224

View full text Add to dashboard Cite

show abstract

“…Córsico & Althaus 2014Istrate et al 2016b). Pulsations have been found in two of the SWASP EL CVn binaries: WASP 0247-25 (Maxted et al 2013;Istrate et al 2017) and WASP 1628+10 (Maxted et al 2014b). The pulsation periods are 5-10 minutes and the amplitudes ∼1-2 per cent of the pre-He-WD luminosity.…”

Section: Pulsationsmentioning

confidence: 99%

Discovery of 36 eclipsing EL CVn binaries found by the Palomar Transient Factory

Roestel

Kupfer

Ruiz-Carmona

et al. 2018

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We report the discovery and analysis of 36 new eclipsing EL CVn-type binaries, consisting of a core helium-composition pre-white dwarf and an early-type main-sequence companion, more than doubling the known population of these systems. We have used supervised machine learning methods to search 0.8 million lightcurves from the Palomar Transient Factory, combined with SDSS, Pan-STARRS and 2MASS colours. The new systems range in orbital periods from 0.46 to 3.8 d and in apparent brightness from ∼14 to 16 mag in the PTF R or g filters. For twelve of the systems, we obtained radial velocity curves with the Intermediate Dispersion Spectrograph at the Isaac Newton Telescope. We modelled the lightcurves, radial velocity curves and spectral energy distributions to determine the system parameters. The radii (0.3-0.7 R ) and effective temperatures (8000-17000 K) of the pre-He-WDs are consistent with stellar evolution models, but the masses (0.12-0.28 M ) show more variance than models have predicted. This study shows that using machine learning techniques on large synoptic survey data is a powerful way to discover substantial samples of binary systems in short-lived evolutionary stages.

show abstract

“…The many observational discoveries and measurements of pulsating stars in the parameter space of ELM and pre-ELM WDs has prompted extensive theoretical investigations into their driving mechanisms and asteroseismic interpretations (Córsico et al 2012Córsico & Althaus 2014aIstrate et al 2016bIstrate et al , 2017Fontaine et al 2017;Calcaferro et al 2017a,b;Sánchez Arias et al 2018).…”

Section: Introductionmentioning

confidence: 99%

The McDonald Observatory search for pulsating sdA stars

Bell

Pelisoli²,

Brown

et al. 2018

A&A

View full text Add to dashboard Cite

Context. The nature of the recently identified “sdA” spectroscopic class of stars is not well understood. The thousands of known sdAs have H-dominated spectra, spectroscopic surface gravity values between main sequence stars and isolated white dwarfs, and effective temperatures below the lower limit for He-burning subdwarfs. Most are likely products of binary stellar evolution, whether extremely low-mass white dwarfs and their precursors or blue stragglers in the halo. Aims. Stellar eigenfrequencies revealed through time series photometry of pulsating stars sensitively probe stellar structural properties. The properties of pulsations exhibited by sdA stars would contribute substantially to our developing understanding of this class. Methods. We extend our photometric campaign to discover pulsating extremely low-mass white dwarfs from the McDonald Observatory to target sdA stars classified from SDSS spectra. We also obtain follow-up time series spectroscopy to search for binary signatures from four new pulsators. Results. Out of 23 sdA stars observed, we clearly detect stellar pulsations in 7. Dominant pulsation periods range from 4.6 min to 12.3 h, with most on timescales of approximately one hour. We argue specific classifications for some of the new variables, identifying both compact and likely main sequence dwarf pulsators, along with a candidate low-mass RR Lyrae star. Conclusions. With dominant pulsation periods spanning orders of magnitude, the pulsational evidence supports the emerging narrative that the sdA class consists of multiple stellar populations. Since multiple types of sdA exhibit stellar pulsations, follow-up asteroseismic analysis can be used to probe the precise evolutionary natures and stellar structures of these individual subpopulations.

show abstract

A Model of the Pulsating Extremely Low-mass White Dwarf Precursor WASP 0247–25B

Cited by 12 publications

References 41 publications

Pulsating white dwarfs: new insights

Pulsating white dwarfs: new insights

Discovery of 36 eclipsing EL CVn binaries found by the Palomar Transient Factory

The McDonald Observatory search for pulsating sdA stars

Contact Info

Product

Resources

About