Detections and constraints on white dwarf variability from time-series GALEX observations

Rowan, D. M.; Tucker, M. A.; Shappee, B. J.; Hermes, J. J.

doi:10.1093/mnras/stz1116

Cited by 30 publications

(25 citation statements)

References 67 publications

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“…Very recently, 36 new DAVs have been discovered by Rowan et al (2019), but for most of them their spectroscopically determined gravities and effec- Table 2 ZZ Ceti stars and their effective temperatures, surface gravities and magnitudes. The T eff and log g values have been corrected to 3D model atmosphere values.…”

Section: Recent Observational Achievementsmentioning

confidence: 99%

Pulsating white dwarfs: new insights

Córsico

Althaus

Bertolami

et al. 2019

Astron Astrophys Rev

205

224

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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

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Section: Recent Observational Achievementsmentioning

confidence: 99%

Pulsating white dwarfs: new insights

Córsico

Althaus

Bertolami

et al. 2019

Astron Astrophys Rev

205

224

View full text Add to dashboard Cite

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“…There have been many searches for exoplanets transiting white dwarfs, e.g. Faedi et al (2011);Fulton et al (2014);van Sluijs & Van Eylen (2018); Dame et al (2019); Rowan et al (2019), but all of them did not find any candidates. In addition, Van Grootel et al (2021) searched for exoplanets around bright SdB stars, but were also only able to put an upper limit to the planet occurrence rate.…”

Section: Introductionmentioning

confidence: 99%

ZTFJ0038+2030: A Long-period Eclipsing White Dwarf and a Substellar Companion

Roestel

Kupfer

Bell

et al. 2021

ApJL

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In a search for eclipsing white dwarfs using the Zwicky Transient Facility lightcurves, we identified a deep eclipsing white dwarf with a dark, substellar companion. The lack of an infrared excess and an orbital period of 10 hours made this a potential exoplanet candidate. We obtained high-speed photometry and radial velocity measurements to characterize the system. The white dwarf has a mass of 0.50 ± 0.02 M and a temperature of 10900 ± 200 K. The companion has a mass of 0.059 ± 0.004 M and a small radius of 0.0783 ± 0.0013 R . It is one of the smallest transiting brown dwarfs known and likely old, 8 Gyr. The ZTF discovery efficiency of substellar objects transiting white dwarfs is limited by the number of epochs and as ZTF continues to collect data we expect to find more of these systems. This will allow us to measure period and mass distributions and allows us to understand the formation channels of white dwarfs with substellar companions.

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“…We consider the spectroscopic values with 3D convection correction and the evolutionary sequences characterized by canonical hydrogen envelopes, i.e, those with the thickest value as predicted by single stellar evolution allowed by nuclear burning (see Romero et al 2019, for details). The location of all observed objects on the T eff − log g plane is depicted in Fig Rowan et al (2019) (magenta square). The values for effective temperature and surface gravity were corrected by 3D convection for all objects ).…”

Section: Sample Selectionmentioning

confidence: 99%

Ground-based observation of ZZ Ceti stars and the discovery of four new variables

Romero

Amaral

Klippel

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We perform ground based photometric observations of 22 DA white dwarf stars, 10 already known ZZ Cetis and 12 candidates with atmospheric parameters inside the classical instability strip. We report on the discovery of four new variable DA white dwarf stars. Two objects are near the middle of the instability strip, SDSS J082804.63+094956.6 and SDSS J094929.09+101918.8, and two red edge pulsators, GD 195 and L495−82. In addition, we classified four objects as possible variables, since evidence of variability was detected in the light curve, but the S/N was not sufficient to establish a definite detection. Follow-up observations were performed for 10 know ZZ Ceti stars to verify period stability and search for new periodicities. For each confirmed variable, we perform a detailed asteroseismological fit and compare the structural parameters obtained from the best fit models with those obtained from spectroscopy and photometry from Gaia. Finally we present a study of the asteroseismological properties of a sample of 91 ZZ Ceti stars.

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Detections and constraints on white dwarf variability from time-series GALEX observations

Cited by 30 publications

References 67 publications

Pulsating white dwarfs: new insights

Pulsating white dwarfs: new insights

ZTFJ0038+2030: A Long-period Eclipsing White Dwarf and a Substellar Companion

Ground-based observation of ZZ Ceti stars and the discovery of four new variables

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