A search for transits among the δ Scuti variables in Kepler
Auteurs : Daniel R. Hey, Benjamin T. Montet, Benjamin J. S. Pope, Simon J. Murphy, Timothy R. Bedding
Résumé scientifique
We search for transits around all known pulsating {\delta} Sct variables (6500 K < Teff < 10 000 K) in the long-cadence Kepler data after subtracting the pulsation signal through an automated routine. To achieve this, we devise a simple and computationally inexpensive method for distinguishing between low-frequency pulsations and transits in light curves. We find 3 new candidate transit events that were previously hidden behind the pulsations, but caution that they are likely to be false positive events. We also examined the Kepler Objects of Interest catalog and identify 13 additional host stars which show {\delta} Sct pulsations. For each star in our sample, we use the non-detection of pulsation timing variations for a planet that is known to be transiting a {\delta} Sct variable to obtain both an upper limit on the mass of the planet and the expected radial velocity semi-amplitude of the host star. Simple injection tests of our pipeline imply 100% recovery for planets of 0.5 RJup or greater. Extrapolating our number of Kepler {\delta} Sct stars, we expect 12 detectable planets above 0.5 RJup in TESS. Our sample contains some of the hottest known transiting planets around evolved stars, and is the first complete sample of transits around {\delta} Sct variables. We make available our code and pulsation-subtracted light curves to facilitate further analysis.
Les articles autour de lui, par date et par proximité
Plus haut, c’est plus proche de cet article ; à gauche, c’est plus ancien. Les traits relient les articles proches entre eux : les groupes de traits sont des sous-thèmes. Sélectionnez un point pour voir pourquoi il est là. Retour au résumé de cet article
Les articles autour de celui-ci
Classés selon la proximité de leur titre et de leur résumé avec ceux de cet article. Sélectionnez-en pour les lire ensemble.
Les articles les plus proches
-
Pulsation in TESS Objects of InterestR. Gomes, B. C. Canto Martins, D. O. Fontinele et al. · 2024 · Astrophysical Journal · cité 2 fois · Pas encore résumé
Résumé scientifique
We report the discovery of three Transiting Exoplanet Survey Satellite Objects of Interest (TOI) with signatures of pulsation, observed in more than one sector. Our main goal is to explore how large is the variety of classical pulsators such as δ Sct, γ Dor, RR Lyrae and Cepheid among TOI pulsators. The analysis reveals two stars with signatures of δ Sct and one of γ Dor, out of a sample of 3901 TOIs with available light curves (LCs). To date, there is a very scarce number of known pulsating stars hosting planets. The present finding also emerges as an exciting laboratory for studying different astrophysical phenomena, including the effects of star–planet interaction on pulsation and timing …
-
A New Catalog of 100,000 Variable TESS A-F Stars Reveals a Correlation between δ Scuti Pulsator Fraction and Stellar RotationK. Gootkin, M. Hon, D. Huber et al. · 2024 · Astrophysical Journal · cité 14 fois · Pas encore résumé
Résumé scientifique
δ Scuti variables are found at the intersection of the classical instability strip and the main sequence on the Hertzsprung–Russell diagram. With space-based photometry providing millions of light curves of A-F type stars, we can now probe the occurrence rate of δ Scuti pulsations in detail. Using the 30 minutes cadence light curves from NASA's Transiting Exoplanet Survey Satellite's first 26 sectors, we identify variability in 103,810 stars within 5–24 cycles per day down to a magnitude of T = 11.25. We fit the period–luminosity relation of the fundamental radial mode for δ Scuti stars in the Gaia G band, allowing us to distinguish classical pulsators from contaminants for a subset of 39,36…
-
EDEN Survey: Small Transiting Planet Detection Limits and Constraints on the Occurrence Rates for Late M Dwarfs within 15 pcJeremy Dietrich, Dániel Apai, Martin Schlecker et al. · 2023 · Earth and Planetary Astrophysics · cité 8 fois · Résumé IA disponible
Résumé scientifique
Earth-sized exoplanets that transit nearby, late spectral type red dwarfs will be prime targets for atmospheric characterization in the coming decade. Such systems, however, are difficult to find via wide-field transit surveys like Kepler or TESS. Consequently, the presence of such transiting planets is unexplored and the occurrence rates of short-period Earth-sized planets around late M dwarfs remain poorly constrained. Here, we present the deepest photometric monitoring campaign of 22 nearby late M dwarf stars, using data from over 500 nights on seven 1-2 meter class telescopes. Our survey includes all known single quiescent northern late M dwarfs within 15 pc. We use transit-injection-and…
-
Single Transit Detection In Kepler With Machine Learning And Onboard Spacecraft DiagnosticsMatthew T. Hansen, Jason A. Dittmann · 2024 · Earth and Planetary Astrophysics · cité 8 fois · Résumé IA disponible
Résumé scientifique
Exoplanet discovery at long orbital periods requires reliably detecting individual transits without additional information about the system. Techniques like phase-folding of light curves and periodogram analysis of radial velocity data are more sensitive to planets with shorter orbital periods, leaving a dearth of planet discoveries at long periods. We present a novel technique using an ensemble of Convolutional Neural Networks incorporating the onboard spacecraft diagnostics of \emph{Kepler} to classify transits within a light curve. We create a pipeline to recover the location of individual transits, and the period of the orbiting planet, which maintains $>80\%$ transit recovery sensitivit…
-
Automated all-sky detection of γ Doradus/ δ Scuti hybrids in TESS data from positive unlabelled (PU) learningM. Kliapets, P. Huijse, A. Tkachenko et al. · 2025 · Astronomy & Astrophysics · Pas encore résumé
Résumé scientifique
Context . The Transiting Exoplanet Survey Satellite (TESS) mission has observed hundreds of millions of stars, substantially contributing to the available pool of high-precision photometric space data. Among them are the relatively rare γ Doradus/ δ Scuti ( γ Dor/ δ Sct) hybrid pulsators, which have been previously studied using Kepler data. These stars are perfect laboratories to probe both inner and outer interior stellar layers thanks to them exhibiting both pressure and gravity modes. Aims . We seek to classify an all-sky sample of AF stars observed by TESS to find previously undiscovered hybrid pulsators and supply them in a catalogue of candidates. We also aim to compare the light curv…
-
The occurrence rate of planets around subgiant stars from the TESS photometric surveyArkaprova Dutta, P. Chaturvedi · 2026 · Astronomy & Astrophysics · Pas encore résumé
Résumé scientifique
Subgiant stars represent a critical phase in stellar evolution, offering an opportunity to investigate how planetary systems respond to the early stages of post-main-sequence expansion. Despite their importance, systematic occurrence-rate studies of this population remain sparse compared with those of main-sequence and red-giant hosts. In this paper, we present a uniform analysis of planet occurrence around a sample of 282,904 subgiant stars selected from the Data Release 3 (DR3) catalogue. We performed an independent re-analysis of Transiting Exoplanet Survey Satellite (TESS) light curves for transit-signal detection and refinement, followed by multi-stage vetting including a visual inspect…
-
A Search for Substellar Companions around A-type Stars: Pulsation Timing Detection of Eight Brown Dwarf Candidates and a Possible Habitable-zone PlanetLogan G. Wilson, D. Hey, B. Shappee et al. · 2026 · Astrophysical Journal · Pas encore résumé
Résumé scientifique
Substellar companions are most often studied around solar-like or smaller stars, as the rapid rotation and variability of massive stars impede detection using traditional methods. An alternative technique, pulsation timing, uses photometry to measure light-travel-time variations—the time integral of the radial velocity signal—providing orbital constraints with strong sensitivity to intermediate-period companions. We analyze the pulsation timing variations of 16,440 δ Scuti pulsators from the Transiting Exoplanet Survey Satellite (TESS), with the goal of identifying substellar companions. We report the discovery of one candidate planet, HD 156295 b, and eight candidate brown dwarfs by fitting…
-
COUNTESS. I. A Uniformly Vetted Catalog of Known and New Transiting Exoplanets in the TESS Northern Continuous Viewing ZoneAndrew Hotnisky, R. Fernandes, K. Hardegree-Ullman et al. · 2026 · Astrophysical Journal Supplement Series · Pas encore résumé
Résumé scientifique
The Transiting Exoplanet Survey Satellite (TESS) has transformed the study of nearby exoplanetary systems; however, its nominal observing strategy limits sensitivity to planets with orbital periods shorter than ∼10 days for most parts of the sky. The two TESS Continuous Viewing Zones (CVZs) provide extended temporal baselines that help overcome this limitation, enabling the detection of longer-period (>10 days) transiting planets around nearby stars. Here, we present COUNTESS, a transit-search pipeline optimized for long-baseline TESS observations that combines multisector light curves with heterogeneous cadences, and implements fast-folding box least-squares period detection, vetting, and s…
Les travaux antérieurs sur lesquels il s’appuie
-
Asteroseismology and Exoplanets: Listening to the Stars and Searching for New WorldsT. Campante, N. Santos, M. A. Monteiro · 2017 · arXiv: Solar and Stellar Astrophysics · preprint, non relu par les pairs · cité 63 fois · Pas encore résumé
Résumé scientifique
This book presents the proceedings of the IVth Azores International Advanced School in Space Sciences entitled "Asteroseismology and Exoplanets: Listening to the Stars and Searching for New Worlds", which took place in Horta, Azores Islands, Portugal in July 2016. The school addressed the topics at the forefront of scientific research being conducted in the fields of asteroseismology and exoplanetary science, two fields of modern astrophysics that share many synergies and resources. The book compiles the contributions from 18 invited lecturers, including a number of hands-on tutorials.
-
Astropy: A community Python package for astronomyT. Robitaille, E. Tollerud, P. Greenfield et al. · 2013 · Astronomy and Astrophysics · cité 11 346 fois · Pas encore résumé
Résumé scientifique
We present the first public version (v0.2) of the open-source and community-developed Python package, Astropy. This package provides core astronomy-related functionality to the community, including support for domain-specific file formats such as flexible image transport system (FITS) files, Virtual Observatory (VO) tables, and common ASCII table formats, unit and physical quantity conversions, physical constants specific to astronomy, celestial coordinate and time transformations, world coordinate system (WCS) support, generalized containers for representing gridded as well as tabular data, and a framework for cosmological transformations and conversions. Significant functionality is under …
-
The Astropy Project: Building an Open-science Project and Status of the v2.0 Core PackageA. Price-Whelan, B. Sipőcz, H. M. Günther et al. · 2018 · Astronomical Journal · cité 6 880 fois · Pas encore résumé
Résumé scientifique
The Astropy Project supports and fosters the development of open-source and openly developed Python packages that provide commonly needed functionality to the astronomical community. A key element of the Astropy Project is the core package astropy, which serves as the foundation for more specialized projects and packages. In this article, we provide an overview of the organization of the Astropy project and summarize key features in the core package, as of the recent major release, version 2.0. We then describe the project infrastructure designed to facilitate and support development for a broader ecosystem of interoperable packages. We conclude with a future outlook of planned new features …
Les articles qui le citent
-
HIP 65426 is a High-Frequency Delta Scuti Pulsator in Plausible Spin-Orbit Alignment with its Directly Imaged ExoplanetAldo G. Sepulveda, Daniel Huber, Timothy R. Bedding et al. · 2023 · Earth and Planetary Astrophysics · cité 5 fois · Résumé IA disponible
Résumé scientifique
HIP 65426 hosts a young giant planet that has become the first exoplanet directly imaged with JWST. Using time-series photometry from the Transiting Exoplanet Survey Satellite (TESS), we classify HIP 65426 as a high-frequency $\delta$ Scuti pulsator with a possible large frequency separation of $\Delta \nu =$7.23$\pm$0.02 cycles day$^{-1}$. We check the TESS data for pulsation timing variations and use the nondetection to estimate a 95% dynamical mass upper limit of 12.8 Mjup for HIP 65426 b. We also identify a low-frequency region of signal that we interpret as stellar latitudinal differential rotation with two rapid periods of 7.85$\pm$0.08 hr and 6.67$\pm$0.04 hr. We use our TESS rotation…
-
Small and Close-in Planets are Uncommon Around A-type StarsS. Giacalone, C. Dressing · 2024 · Astronomical Journal · cité 5 fois · Pas encore résumé
Résumé scientifique
The Kepler and K2 missions enabled robust calculations of planet occurrence rates around FGKM-type stars. However, these missions observed too few stars with earlier spectral types to tightly constrain the occurrence rates of planets orbiting hotter stars. Using TESS, we calculate the occurrence rate of small (1 R⊕ < Rp < 8 R⊕), close-in (Porb < 10 days) planets orbiting A-type stars for the first time. We search a sample of 20,257 bright (6 < T < 10) A-type stars for transiting planets using a custom pipeline and vet the detected signals, finding no reliable small planets. We characterize the pipeline completeness using injection–recovery tests and determine the 3σ upper limits of the occur…
-
Signature of High-amplitude Pulsations in Seven δ Sct Stars via TESS ObservationsFatemeh Vasigh, E. Ziaali, H. Safari · 2024 · Astrophysical Journal · cité 3 fois · Pas encore résumé
Résumé scientifique
The regular behavior of the pulsations of high-amplitude δ Sct (HADS) stars gives a greater chance to investigate the interiors of stars. We analyzed seven HADS stars showing peak-to-peak amplitudes of more than 0.3 mag that were newly observed by TESS. We obtained that TIC 374753270, TIC 710783, and TIC 187386415 pulsate in fundamental radial mode; also, TIC 130474019 and TIC 160120432 show double radial modes. On the other hand, TIC 148357344 and TIC 278119167 demonstrate triple-mode behavior. Our analysis shows that these seven stars are close to the red edge of the (inside) instability strip in the Hertzsprung–Russell diagram. The fundamental mode of these seven targets follows the perio…
-
The Directly-Imaged Exoplanet Host Star 51 Eridani is a Gamma Doradus PulsatorAldo G. Sepulveda, Daniel Huber, Zhoujian Zhang et al. · 2022 · The Astrophysical Journal, 938, 49 (2022) · cité 8 fois · Résumé IA disponible
Résumé scientifique
51 Eri is well known for hosting a directly-imaged giant planet and for its membership to the $\beta$ Pictoris moving group. Using two-minute cadence photometry from the Transiting Exoplanet Survey Satellite (TESS), we detect multi-periodic variability in 51 Eri that is consistent with pulsations of Gamma Doradus ($\gamma$ Dor) stars. We identify the most significant pulsation modes (with frequencies between $\sim$0.5-3.9 cycles/day and amplitudes ranging between $\sim$1-2 mmag) as dipole and quadrupole gravity-modes, as well as Rossby modes, as previously observed in Kepler $\gamma$ Dor stars. Our results demonstrate that previously reported variability attributed to stellar rotation is ins…
-
Pulsations in binary stars -- a short reviewS. Murphy · 2024 · Contributions of the Astronomical Observatory Skalnaté Pleso · Pas encore résumé
Résumé scientifique
Asteroseismology has become an indispensable method for measuring stellar ages and radii, while binary systems remain the most prevalent tool for determining stellar masses. The synergy of the two, namely pulsating stars in binary systems, offer even more than the sum of their parts. The sometimes-overwhelming number of pulsation models to be examined for asteroseismic modelling can be tightly constrained when dynamical masses for both components are available. Binaries offer twice the opportunity to measure an asteroseismic age, which is then applicable to both components of a system, often providing ages for stars that are otherwise very difficult to determine. Some stellar physics, such a…
Aller plus loin
Comment ces articles sont-ils trouvés ?
Nous comparons le titre et le résumé de cet article avec ceux de tous les articles résumés sur ce site, et avec les articles que Semantic Scholar recommande, ceux qu’il cite et ceux qui le citent (pour un article très cité, ses citations les plus récentes et, depuis OpenAlex, les plus citées). Parmi les travaux antérieurs et les suites, les articles qui s’utilisent en profondeur, une méthode qu’il utilise et les suites très citées remontent un peu. Les niveaux (très proche, proche, apparenté) viennent de la similarité des textes, pas d’un jugement de qualité ; * signale un article sans résumé, comparé par son titre. La phrase sous un article est écrite par une IA à partir des deux résumés : vérifiez-la dans les articles. Un article jugé hors sujet par trois lecteurs quitte la liste.
Mis à jour le 6 novembre 2026.