@misc{10481/97492,
year = {2024},
month = {10},
url = {https://hdl.handle.net/10481/97492},
abstract = {The presence of low-amplitude peaks o v er the noise in the power spectra of δScuti stars is frequently disregarded. These seemingly insignificant peaks, collectively referred to as grass , might contain valuable information about the origin of these stars and the reasons behind the occurrence or absence of a plateau. It is crucial to systematically parametrize the grass phenomenon throughout a comprehensive sample that covers the entire δScuti star parameter range. Thus, we conduct a quantitative study of long-duration, high-duty-cycle Transiting Exoplanet Survey Satellite light curves, leading to improved detection methods for plateaus and a deeper understanding of their nature. This approach minimizes the impact of unresolved peaks caused by mode variations o v er time. Additionally, we present appropriate analysis techniques to mitigate windo w ef fects and identify and eliminate spurious peaks. We demonstrate here that the grass can be ef fecti vely parametrized based on peak density. With such parametrization two distinct regimes are found: the sparse grass regime , characterized by low peak density and the absence of a plateau in the power spectra, and the dense grass regime , characterized by high peak densities and the presence of an observable plateau. Our study is the first rigorous quantification of the emergence of such a plateau in the power spectra of δScuti stars. Since the grass might be related with fractality, mode variability, and stellar rotation rate, its parametrization opens a new way to analyse these stars.},
organization = {Funding for the TESS mission is provided by the NASA Explorer Program},
organization = {Spanish State Research Agency (AEI) projects no. PID2019-107061GB-C64: ‘Contribu- tion of the UGR to the PLATO2.0 space mission},
organization = {Severo Ochoa grant CEX2021-001131-S funded by MCIN/AEI/ 10.13039/501100011033},
organization = {‘Planes Complementarios’ Astrophysics and High Energy Physics of the Spanish MCIU (AST22 00001 26) and also these from the PLATO project collaboration with Centro de Astrobiolog ´ıa (PID2019-107061GB-C61)},
organization = {Project PID2019-107061GB-C63 from the ‘Programas Estatales de Generación de Conocimiento y Fortalecimiento Científico y Tecnológico del Sistema de I + D + i y de I + D + i Orientada a los Retos de la Sociedad’},
organization = {‘European Regional Development Fund/Junta de Andaluc ´ıa- Consejer ´ıa de Econom ´ıa y Conocimiento’ under project E-FQM- 041-UGR18 by Universidad de Granada},
organization = {Project AST22 00001 8 of the ‘Junta de Andalucía and the Ministerio de Ciencia, Innovación y Universidades’ funded by the NextGenerationEU and the ‘Plan de Recuperación, Transformación y Resiliencia’},
organization = {NSF grants AST -1910396 and AST -2108975 and NASA grants 80NSSC22K0622, 80NSSC21K0245, and NNX16AB76G},
publisher = {Oxford University Press},
keywords = {asteroseismology},
keywords = {stars: oscillations ( including pulsations )},
keywords = {stars: variables: Scuti},
title = {Characterizing the features of the low-amplitude peaks in delta Scuti stars with TESS},
doi = {10.1093/mnras/stae2439},
author = {Barceló Forteza, Sebatiá and Pascual-Granado, Javier and Suárez Yanes, Juan Carlos and García Herández, Antonio and Mirouh, Giovanni Marcello and Lares-Martiz, Mariel},
}