263 citations · 2.5k across the 58 of their papers we have counts for
58 papers
Thirty Two New Bright ZZ Ceti Stars from TESS: Adding Cycles 4 and 5
Alejandra D. Romero, S. O. Kepler, Gabriela Oliveira da Rosa +1
Analyzing all 120 s and 20 s light curves obtained by the TESS satellite up to Sector 69 - the end of the fifth year of observations - for all known white dwarfs and white dwarf ca…
Photometric White Dwarf Rotation
Gabriela Oliveira da Rosa, S. O. Kepler, L. T. T. Soethe +2
We present a census of photometrically detected rotation periods for white dwarf (WD) stars. We analyzed the light curves of 9285 WD stars observed by the Transiting Exoplanet Surv…
TIC 378898110: A Bright, Short-Period AM CVn Binary in TESS
Matthew J. Green, J. J. Hermes, Brad N. Barlow +22
AM CVn-type systems are ultracompact, helium-accreting binary systems which are evolutionarily linked to the progenitors of thermonuclear supernovae and are expected to be strong G…
An Eclipsing 47 minute Double White Dwarf Binary at 400 pc
James Munday, P. -E. Tremblay, J. J. Hermes +20
We present the discovery of the eclipsing double white dwarf (WD) binary WDJ 022558.21-692025.38 that has an orbital period of 47.19 min. Following identification with the Transiti…
A 5.3-minute-period pulsing white dwarf in a binary detected from radio to X-rays
Ingrid Pelisoli, T. R. Marsh, David A. H. Buckley +19
White dwarf stars are the most common stellar fossils. When in binaries, they make up the dominant form of compact object binary within the Galaxy and can offer insight into differ…
Catalog of magnetic white dwarfs with hydrogen dominated atmospheres
L. L. Amorim, S. O. Kepler, Baybars Külebi +2
White dwarfs are excellent research laboratories as they reach temperatures, pressures, and magnetic fields that are unattainable on Earth. To better understand how these three phy…
Asteroseismology of PG 1541651 and BPM 31594 with TESS
Alejandra D. Romero, Gabriela Oliveira da Rosa, S. O. Kepler +5
We present the photometric data from TESS for two known ZZ Ceti stars, PG 1541+651 and BPM 31594. Before TESS, both objects only had observations from short runs from ground-based…
Pulsating H-deficient WDs and pre-WDs observed with TESS: V. Discovery of two new DBV pulsators, WD J152738.4-450207.4 and WD 1708-871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058-5234, and EC 04207-4748
Alejandro H. Córsico, Murat Uzundag, S. O. Kepler +9
The {\sl TESS} space mission has recently demonstrated its great potential to discover new pulsating white dwarf and pre-white dwarf stars, and to detect periodicities with high pr…
The impact of the uncertainties in the 12C(α,γ)16O reaction rate on the evolution of low- to intermediate-mass stars
Ben T. Pepper, A. G. Istrate, A. D. Romero +1
One of the largest uncertainties in stellar evolutionary computations is the accuracy of the considered reaction rates. The 12C(alpha,gamma)16O reaction is particularly important f…
Discovery of 74 new bright ZZ Ceti stars in the first three years of TESS
A. D. Romero, S. O. Kepler, J. J. Hermes +17
We report the discovery of 74 new pulsating DA white dwarf stars, or ZZ Cetis, from the data obtained by the Transiting Exoplanet Survey Satellite (TESS) mission, from Sectors 1 to…
Uncovering the chemical structure of the pulsating low-mass white dwarf SDSS J115219.99+024814.4
A. D. Romero, G. R. Lauffer, A. G. Istrate +1
Pulsating low-mass white dwarf stars are white dwarfs with stellar masses between 0.30~M and 0.45~M that show photometric variability due to gravity-mode pulsat…
White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 16
S. O. Kepler, Detlev Koester, Ingrid Pelisoli +2
White dwarfs are the end state of the evolution of more than 97% of all stars, and therefore carry information on the structure and evolution of the Galaxy through their luminosity…
The pulsating white dwarf G117-B15A: still the most stable optical clock known
S. O. Kepler, D. E. Winget, Zachary P. Vanderbosch +14
The pulsating hydrogen atmosphere white dwarf star G 117-B15A has been observed since 1974. Its main pulsation period at 215.19738823(63) s, observed in optical light curves, varie…
Pulsation in the white dwarf HE 1017-1352: confirmation of the class of hot DAV stars
Alejandra D. Romero, L. Antunes Amaral, S. O. Kepler +3
We report the detection of periodic variations on the T_eff ~32 000 K DA white dwarf star HE 1017-1352. We obtained time series photometry using the 4.1 m SOAR telescope on three s…
Evidence of Spectral Evolution on the white dwarf sample from the Gaia Mission
G. Ourique, S. O. Kepler, A. D. Romero +2
Since the Gaia data release 2, several works were published describing a bifurcation in the observed white dwarf colourmagnitude diagram for $\mbox{$G_{\mathrm{BP}}$}-\mbox{$G_{…
Ground based observation of ZZ Ceti stars and the discovery of four new variables
Alejandra D. Romero, L. Antunes Amaral, T. Klippel +7
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 instabilit…
White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14
S. O. Kepler, Ingrid Pelisoli, Detlev Koester +6
White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass relation. Very cool white dwarfs…
The white dwarf mass-radius relation and its dependence on the hydrogen envelope
Alejandra D. Romero, S. O. Kepler, S. R. G. Joyce +2
We present a study of the dependence of the mass-radius relation for DA white dwarf stars on the hydrogen envelope mass and the impact on the value of log g, and thus the determina…
A Study of Cool White Dwarfs in the Sloan Digital Sky Survey Data Release 12
G. Ourique, A. D. Romero, S. O. Kepler +2
In this work we study white dwarfs where to compare the differences in the cooling of DAs and non-DAs and their f…
Evolution and Asteroseismology of Pulsating Low-Mass White Dwarfs
L. M. Calcaferro, A. H. Córsico, L. G. Althaus +2
Many low-mass white dwarfs are being discovered in the field of our galaxy and some of them exhibit -mode pulsations, comprising the extremely low-mass variable (ELMV) stars cla…
The impact of pre-white dwarf evolution on the pulsational properties and asteroseismological inferences of ZZ Ceti stars
F. C. De Gerónimo, L. G. Althaus, A. H. Córsico +2
ZZ Ceti stars are pulsating white dwarfs with a carbon-oxygen core (or possibly ONe for the most massive stars) build up during the core helium burning (CHeB) and thermally pulsing…
Blue Large-Amplitude Pulsators (BLAPs): possible origin, evolutionary status, and nature of their pulsations
Alejandro H. Córsico, Alejandra D. Romero, Leandro G. Althaus +2
The Blue Large-Amplitude Pulsators (BLAPs) constitute a new class of pulsating stars. They are hot stars with effective temperatures of K and surface grav…
New full evolutionary sequences of H and He atmosphere massive white dwarf stars using MESA
G. R. Lauffer, A. D. Romero, S. O. Kepler
We explore the evolution of hydrogen-rich and hydrogen-deficient white dwarf stars with masses between 1.012 and 1.307 Msun, and initial metallicity of Z=0.02. These sequences are…
The sdA problem - II. Photometric and Spectroscopic Follow-up
Ingrid Pelisoli, S. O. Kepler, D. Koester +3
Subdwarf A star (sdA) is a spectral classification given to objects showing H-rich spectra and sub-main sequence surface gravities, but effective temperature lower than the zero-ag…