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26 papers
Asteroseismic Detection of a Massive Unseen Companion to the Scuti Star TIC 160582982
Chenglong Lv, J. Pascual-Granado, Ali Esamdin +4
We present TIC 160582982, an eccentric Scuti binary with a dynamically massive unseen companion. Six coherent high-frequency pressure modes used as pulsation clocks yield a pha…
Discovery and Characterization of Three New High-amplitude delta Scuti Stars from TESS Observations
Chenglong Lv, Ali Esamdin, J. Pascual-Granado +5
We report the discovery and detailed analysis of three new high-amplitude δ Scuti (HADS) stars, TIC 408074920, TIC 189714989, and TIC 34137913, identified from Transiting Exoplanet…
Machine learning for understanding pulsating stars I: the non-linear phenomenon in δ Scuti stars
J. R. Rodon, J. Pascual-Granado, M. Lares-Martiz +2
Scuti stars are pulsating variable stars that exhibit both radial and non-radial pulsations, making them key objects for understanding stellar evolution and internal structures…
A complex network approach to TESS light curves of Sct stars
E. Ziaali, S. de Franciscis, J. Pascual-Granado +4
By using the horizontal visibility algorithm, the TESS light curves of 69 delta Sct stars are mapped to undirected horizontal visibility graphs (HVGs), where the graph nodes repres…
TESS Cycle 2 observations of roAp stars with 2-min cadence data
D. L. Holdsworth, M. S. Cunha, M. Lares-Martiz +46
We present the results of a systematic search of the Transiting Exoplanet Survey Satellite (TESS) 2-min cadence data for new rapidly oscillating Ap (roAp) stars observed during the…
The PL diagram for Sct stars: back in business as distance estimators
A. García Hernández, J. Pascual-Granado, M. Lares-Martiz +4
In this work, we focus on the period-luminosity relation (PLR) of Sct stars, in which mode excitation and selection mechanisms are still poorly constrained, and whose structure…
The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
The Astropy Collaboration, Adrian M. Price-Whelan, Pey Lian Lim +133
The Astropy Project supports and fosters the development of open-source and openly-developed Python packages that provide commonly needed functionality to the astronomical communit…
Comprehensive power spectral density analysis of the Fermi-LAT -ray light curves of selected blazars
Natalia Żywucka, Mariusz Tarnopolski, Volodymyr Marchenko +1
We present the results of the Fermi-Large Area Telescope (LAT) light curve (LC) modelling of selected blazars: six flat spectrum radio quasars (FSRQs) and five BL Lacertae (BL Lacs…
Discovery and analysis of low-surface-brightness galaxies in the environment of NGC 1052
Javier Román, Aida Castilla, Javier Pascual-Granado
The environment of NGC1052 has recently attracted much attention because of the presence of low-surface-brightness galaxies (LSBGs) with apparently "exotic" properties, making it a…
KIC 12602250: A low-amplitude Double-mode Scuti star with Amplitude Modulation
Chenlong Lv, Ali Esamdin, Xiangyun Zeng +3
We propose for the first time that KIC 12602250 is a low-amplitude radial double-mode Scuti star with amplitude modulation. The detailed frequency analysis is given for the lig…
Study of rotational splittings in ~Scuti stars using pattern finding techniques
A. Ramón-Ballesta, A. García Hernández, J. C. Suárez +3
Detecting and understanding rotation in stellar interiors is nowadays one of the unsolved problems in stellar physics. Asteroseismology has been able to provide insights on rotatio…
TESS Cycle 1 observations of roAp stars with 2-min cadence data
D. L. Holdsworth, M. S. Cunha, D. W. Kurtz +41
We present the results of a systematic search for new rapidly oscillating Ap (roAp) stars using the 2-min cadence data collected by the Transiting Exoplanet Survey Satellite (TESS)…
Searching for signatures of chaos in gamma-ray light curves of selected Fermi-LAT blazars
O. Ostapenko, M. Tarnopolski, N. Żywucka +1
Blazar variability appears to be stochastic in nature. However, a possibility of low-dimensional chaos was considered in the past, but with no unambiguous detection so far. If pres…
TESS observations of Cepheid stars: first light results
E. Plachy, A. Pál, A. Bódi +33
We present the first analysis of Cepheid stars observed by the TESS space mission in Sectors 1 to 5. Our sample consists of 25 pulsators: ten fundamental mode, three overtone and t…
A comprehensive power spectral density analysis of astronomical time series I: the Fermi-LAT gamma-ray light curves of selected blazars
Mariusz Tarnopolski, Natalia Żywucka, Volodymyr Marchenko +1
We present the results of the \textit{Fermi}-LAT 10-years-long light curves (LCs) modeling of selected blazars: six flat spectrum radio quasars (FSRQs) and five BL Lacertae (BL Lac…
Self-consistent method to extract non-linearities from pulsating stars light curves I. Combination frequencies
M. Lares-Martiz, R. Garrido, J. Pascual-Granado
Combination frequencies are not solutions of the perturbed stellar structure equations. In dense power spectra from a light curve of a given multi-periodic pulsating star, they can…
The first view of Scuti and Doradus stars with the TESS mission
V. Antoci, M. S. Cunha, D. M. Bowman +63
We present the first asteroseismic results for Scuti and Doradus stars observed in Sectors 1 and 2 of the TESS mission. We utilise the 2-min cadence TESS data for a sample…
Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2
M. S. Cunha, V. Antoci, D. L. Holdsworth +36
We present the first results from the Transiting Exoplanet Survey Satellite (TESS) on the rotational and pulsational variability of magnetic chemically peculiar A-type stars. We an…
Asteroseismology of massive stars with the TESS mission: the runaway Beta Cep pulsator PHL 346 = HN Aqr
Gerald Handler, Andrzej Pigulski, Jadwiga Daszyńska-Daszkiewicz +21
We report an analysis of the first known Beta Cep pulsator observed by the TESS mission, the runaway star PHL 346 = HN Aqr. The star, previously known as a singly-periodic pulsator…
Physical insights on fractal analysis applied to light curves Scuti stars
S. de Franciscis, J. Pascual-Granado, J. C. Suárez +4
Fractal fingerprints have been found recently in the light curves of several δ Scuti stars observed by CoRoT satellite. This sole fact might pose a problem for the detection of pul…
Fractal analysis applied to light curves of Scuti stars
S. de Franciscis, J. Pascual-Granado, J. C. Suárez +2
Fractal behaviour, i.e. scale invariance in spatio-temporal dynamics, have been found to describe and model many systems in nature, in particular fluid mechanics and geophysical re…
Impact of gaps in the asteroseismic characterization of pulsating stars. I. On the efficiency of pre-whitening
J. Pascual-Granado, J. C. Suárez, R. Garrido +4
It is known that the observed distribution of frequencies in CoRoT and Kepler δ Scuti stars has no parallelism with any theoretical model. Pre-whitening is a widespread technique i…
Precise surface gravities of Scuti stars from asteroseismology
A. García Hernández, J. C. Suárez, A. Moya +8
The work reported here demonstrates that it is possible to accurately determine surface gravities of Sct stars using the frequency content from high precision photometry and a…
Inconsistencies in the application of harmonic analysis to pulsating stars
J. Pascual-Granado, R. Garrido, J. C. Suárez
Using ultra-precise data from space instrumentation we found that the underlying functions of stellar light curves from some AF pul- sating stars are non-analytic, and consequently…