The Eclipsing δ Scuti Star EPIC 245932119

Lee, Jae Woo; Hong, Kyeongsoo; Kristiansen, Martti H.

doi:10.3847/1538-3881/aaf0fb

Cited by 10 publications

(9 citation statements)

References 29 publications

(26 reference statements)

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“…From iterative pre-whitening pipeline we obtained 25 significant frequencies, 11 of which can be explained as harmonics or combination frequencies. We note that seven of the frequencies reported by Lee et al (2019) are either harmonics of the orbital frequency, or can be explained as second-order combination frequencies with the orbital frequency. Finally, 12 of the 25 frequencies in the TESS light curve of HD 220687 are above the Kepler/K2 long-cadence Nyquist frequency of 24.49 d −1 which emphasizes the usefulness of short-cadence observations for studying δ Sct stars.…”

Section: Tic 49677785 = Hd 220687mentioning

confidence: 71%

“…Recently, HD 220687 was observed for approximately 80 d by the K2 mission (Howell et al 2014). From these K2 data and estimates of the primary's surface gravity and effective temperature from RAVE spectroscopy, Lee, Hong & Kristiansen (2019) obtained a binary model with the Wilson Devinney Code, albeit without an estimate for the mass ratio from radial velocities. After subtracting their binary light-curve solution, Lee et al (2019) found 35 significant frequencies with an S/N ≥ 4 using a noise window of the size 5 d −1 centred around each peak; all of these frequencies were inferred to be δ Sct pulsations.…”

Section: Tic 49677785 = Hd 220687mentioning

confidence: 99%

“…12). Given the lack of an accurately constrained mass ratio and the presence of remaining harmonics after the binary model subtraction, we chose to not adopt the binary solution by Lee et al (2019). Instead, we directly subtracted the orbital frequency (f orb = 0.62725 d −1 ) and all its significant harmonics up to 80 d −1 and then examined the remaining variance.…”

Section: Tic 49677785 = Hd 220687mentioning

confidence: 99%

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The first view of δ Scuti and γ Doradus stars with the TESS mission

Antoci

Cunha

Bowman

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We present the first asteroseismic results for δ Scuti and γ Doradus stars observed in Sectors 1 and 2 of the TESS mission. We utilize the 2-min cadence TESS data for a sample of 117 stars to classify their behaviour regarding variability and place them in the Hertzsprung–Russell diagram using Gaia DR2 data. Included within our sample are the eponymous members of two pulsator classes, γ Doradus and SX Phoenicis. Our sample of pulsating intermediate-mass stars observed by TESS also allows us to confront theoretical models of pulsation driving in the classical instability strip for the first time and show that mixing processes in the outer envelope play an important role. We derive an empirical estimate of 74 per cent for the relative amplitude suppression factor as a result of the redder TESS passband compared to the Kepler mission using a pulsating eclipsing binary system. Furthermore, our sample contains many high-frequency pulsators, allowing us to probe the frequency variability of hot young δ Scuti stars, which were lacking in the Kepler mission data set, and identify promising targets for future asteroseismic modelling. The TESS data also allow us to refine the stellar parameters of SX Phoenicis, which is believed to be a blue straggler.

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Section: Tic 49677785 = Hd 220687mentioning

confidence: 71%

Section: Tic 49677785 = Hd 220687mentioning

confidence: 99%

Section: Tic 49677785 = Hd 220687mentioning

confidence: 99%

See 1 more Smart Citation

The first view of δ Scuti and γ Doradus stars with the TESS mission

Antoci

Cunha

Bowman

et al. 2019

Monthly Notices of the Royal Astronomical Society

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show abstract

“…The LcTools community currently consists of 77 registered users worldwide. A recent survey of the publications posted on arXiv 1 found 20 papers that either cited or acknowledged use of the product for investigating various astronomical phenomena (C ¸okluk et al 2019;Gaidos et al 2019;Rappaport et al 2019a;Eisner et al 2019;Rappaport et al 2019b;Ansdell et al 2019;Borkovits et al 2019;Lee et al 2019;Oláh et al 2018;Rodriguez et al 2018;Borkovits et al 2018;Malavolta et al 2018;LaCourse & Jacobs 2018;Rappaport et al 2018;Zhou et al 2018;Christiansen et al 2018;Rappaport et al 2017;Schmitt et al 2016;Ansdell et al 2016;Kipping et al 2015). This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

LcTools: A Windows-Based Software System for Finding and Recording Signals in Lightcurves from NASA Space Missions

Schmitt,

Hartman,

Kipping

2019

Preprint

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Since 2009, the Kepler, K2, and TESS missions have produced a vast number of lightcurves for public use. To assist citizen scientists in processing those lightcurves, the LcTools software system was developed. The system provides a set of tools to efficiently search for signals of interest in large sets of lightcurves using automated and manual (visual) techniques. At the heart of the system is a multipurpose lightcurve viewer and signal processor with advanced navigation and display capabilities to facilitate the search for signals. Other applications in the system are available for building lightcurve files in bulk, finding periodic signals automatically, and generating signal reports. This paper describes each application in the system and the methods by which the software can be used to detect and record signals. The software is free and can be obtained from the lead author by request at

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“…Then, the strong synergy between EBs and pulsators can play a critical reciprocal role in providing significant information on the stellar parameters and internal structures. We have been searching for and characterizing the pulsating EBs using Kepler photometry (Lee et al 2014(Lee et al , 2019 and ground-based spectroscopy (Hong et al 2015;Lee & Park 2018). In this paper, our program target is TIC 309658221 (HD 34954, TYC 8878-116-1, GSC 8878-0116, 2MASS J05170089-6130524; V T = +10.31, (B − V ) T = +0.35; Høg et al 2000), which was known as a single F-type star prior to the TESS observations (Stassun et al 2018).…”

Section: Introductionmentioning

confidence: 99%

The Pulsating Eclipsing Binary TIC 309658221 in a 7.59-day Orbit

Lee

Kristiansen

Hong

2019

Self Cite

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We present a new eclipsing binary (EB) showing multiperiodic oscillations using the first three sectors of TESS photometry. The eclipse and pulsation light curves of TIC 309658221 were modeled using an iterative method to obtain a consistent photometric solution. The TESS target is a circular-orbit, detached binary system with a mass ratio of 0.349, an inclination angle of 80.42 deg, and a temperature difference of 847 K between the components. The primary component of the system lies near the red edge of the δ Sct instability region on the main-sequence band in the Hertzsprung-Russell diagram. Multiple frequency analyses were applied to the eclipse-subtracted residuals after removing the binary effects in the observed data. These resulted in the detection of 26 frequencies, of which f 1 − f 6 were independent pulsation frequencies. The 20 other frequencies could be mainly caused by orbital harmonics (f 8 and f 11 ) or combination frequencies. The period ratios and pulsation constants of the f 1 − f 6 frequencies are in the ranges of P pul /P orb = 0.010−0.013 and Q = 0.027−0.036 days, respectively, which are typical of δ Sct type. The results reveal that TIC 309658221 is an eclipsing δ Sct star with an orbital period of 7.5952 days and pulsation frequencies of 9.94−13.01 day −1 . This work demonstrates that the 2-min cadence observations of TESS are very useful for the study of pulsating EBs with multiple frequencies and low amplitudes.

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The Eclipsing δ Scuti Star EPIC 245932119

Cited by 10 publications

References 29 publications

The first view of δ Scuti and γ Doradus stars with the TESS mission

The first view of δ Scuti and γ Doradus stars with the TESS mission

LcTools: A Windows-Based Software System for Finding and Recording Signals in Lightcurves from NASA Space Missions

The Pulsating Eclipsing Binary TIC 309658221 in a 7.59-day Orbit

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