Doppler beaming factors for white dwarfs, main sequence stars, and giant stars Limb-darkening coefficients for 3D (DA and DB) white dwarf models

Abstract

We computed Doppler beaming factors for DA, DB, and DBA white dwarf models, as well as for main sequence and giant stars covering the transmission curves of the Sloan, UBVRI, HiPERCAM, Kepler, TESS, and Gaia photometric systems. The calculations of the limb-darkening coefficients for 3D models were carried out using the least-squares method for these photometric systems. The beaming factor calculations, which use realistic models of stellar atmospheres, show that the black body approximation is not accurate, particularly for the filters $u$, $u^{\prime }$, $U$, $g$, $g^{\prime }$, and $B$. The black body approach is only valid for high effective temperatures and/or long effective wavelengths. Therefore, for more accurate analyses of light curves, we recommend the use of the beaming factors presented in this paper. Concerning limb-darkening, the distribution of specific intensities for 3D models indicates that, in general, these models are less bright toward the limb than their 1D counterparts, which implies steeper profiles. To describe these intensities better, we recommend the use of the four-term law (also for 1D models) given the level of precision that is being achieved with Earth-based instruments and space missions such as Kepler and TESS (and PLATO in the future).

Accepted Astronomy&Astrophysics

References in corpus (4)

• The Stagger-grid: A grid of 3D stellar atmosphere models - IV. Limb darkening coefficients
• Gravity and limb-darkening coefficients for compact stars: DA, DB, and DBA eclipsing white dwarfs
• Calibration of the mixing length theory for structures of helium-dominated atmosphere white dwarfs
• The full $Kepler$ phase curve of the eclipsing hot white dwarf binary system KOI-964

Cited by in corpus (8)

• The ELM Survey. IX. A Complete Sample of Low Mass White Dwarf Binaries in the SDSS Footprint
• Photometric follow-up of 43 new eclipsing white dwarf plus main-sequence binaries from the ZTF survey
• Hot subdwarfs in close binaries observed from space II: Analysis of the light curves
• CHEOPS finds KELT-1b darker than expected in visible light: Discrepancy between the CHEOPS and TESS eclipse depths
• A dense $0.1{\mathbf{M}}_{\odot }$ star in a 51-minute orbital period eclipsing binary
• An Eclipsing 47 minute Double White Dwarf Binary at 400 pc
• Five new eclipsing binaries with low-mass companions
• 50 Dra: Am-type twins with additional variability in a non-eclipsing system