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

Schmitt, Allan R.; Hartman, Joel D.; Kipping, David M.

doi:10.48550/arxiv.1910.08034

Cited by 24 publications

(23 citation statements)

References 26 publications

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“…The VSG discoveries were all made using standard personal computers with Linux, Macintosh, or Windows oper-1 A catalog of quadruple false positives is beyond the scope of this work but we plan to present such a catalog in the future ating systems. The visual surveyors made use of the LcTools software system (Schmitt et al 2019;Schmitt & Vanderburg 2021) -an interactive set of tools designed for lightcurve analysis -and custom software written in Python, C, or JavaScript. The most common method of detection required scanning through millions of public domain lightcurves using LcTools.…”

Section: Detection Methodsmentioning

confidence: 99%

97 Eclipsing Quadruple Star Candidates Discovered in TESS Full Frame Images

Kostov,

Powell,

Rappaport

et al. 2022

Preprint

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We present a catalog of 97 uniformly-vetted candidates for quadruple star systems. The candidates were identified in TESS Full Frame Image data from Sectors 1 through 42 through a combination of machine learning techniques and visual examination, with major contributions from a dedicated group of citizen scientists. All targets exhibit two sets of eclipses with two different periods, both of which pass photocenter tests confirming that the eclipses are on-target. This catalog outlines the statistical properties of the sample, nearly doubles the number of known multiply-eclipsing quadruple systems, and provides the basis for detailed future studies of individual systems. Several important discoveries have already resulted from this effort, including the first sextuply-eclipsing sextuple stellar system and the first transiting circumbinary planet detected from one sector of TESS data.

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Section: Detection Methodsmentioning

confidence: 99%

97 Eclipsing Quadruple Star Candidates Discovered in TESS Full Frame Images

Kostov,

Powell,

Rappaport

et al. 2022

Preprint

Self Cite

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“…Upon the data release of each TESS sector's Candidate Target List (CTL, Stassun et al 2018), the Pre-search Data Conditioned Simple Aperture Photometry (PDCSAP) lightcurves, binned at 30minute cadence, are displayed with L T (Schmitt et al 2019). The TESS data are hosted by the Mikulski Archive for Space Telescopes (MAST) and are downloaded as FITS files.…”

Section: Discoverymentioning

confidence: 99%

A 2+1 + 1 quadruple star system containing the most eccentric, low-mass, short-period, eclipsing binary known

Han

Rappaport

Vanderburg

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We present an analysis of a newly discovered 2+1+1 quadruple system with TESS containing an unresolved eclipsing binary (EB) as part of TIC 121088960 and a close neighbor TIC 121088959. The EB consists of two very low-mass M dwarfs in a highly-eccentric (e = 0.709) short-period (P = 3.04358 d) orbit. Given the large pixel size of TESS and the small separation (3${^{\prime\prime}_{.}}$9) between TIC 121088959 and TIC 121088960 we used light centroid analysis of the difference image between in-eclipse and out-of-eclipse data to show that the EB likely resides in TIC 121088960, but contributes only ∼10% of its light. Radial velocity data were acquired with iSHELL at NASA’s Infrared Facility and the Coudé spectrograph at the McDonald 2.7-m telescope. For both images, the measured RVs showed no variation over the 11-day observational baseline, and the RV difference between the two images was 8 ± 0.3 km s−1. The similar distances and proper motions of the two images indicate that TIC 121088959 and TIC 121088960 are a gravitationally bound pair. Gaia’s large RUWE and astrometric_excess_noise parameters for TIC 121088960, further indicate that this image is the likely host of the unresolved EB and is itself a triple star. We carried out an SED analysis and calculated stellar masses for the four stars, all of which are in the M dwarf regime: 0.19 M⊙ and 0.14 M⊙ for the EB stars and 0.43 M⊙ and 0.39 M⊙ for the brighter visible stars, respectively. Lastly, numerical simulations show that the orbital period of the inner triple is likely the range 1 to 50 years.

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“…We carried out an independent search by applying the BLS algorithm to the whole C18 sample, in order to cross-check the search. We used the BLS implementation of the lctools software (Schmitt et al 2019) considering low-restrictive signal properties: signal-tonoise ratio > 6, planet size > 0.5 R ⊕ , orbital period > 0.25 d and transit duration > 1 h. As a result, the BLS search retrieved all the findings made by the K2-OjOS members except single transits, and no extra candidate was found.…”

Section: Independent Search Through Bls Algorithmmentioning

confidence: 99%

The K2-OjOS Project: New and revisited planets and candidates in K2 campaigns 5, 16, & 18

Castro-González,

Alonso,

Blanco

et al. 2021

Preprint

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We present the first results of K2-OjOS, a collaborative project between professional and amateur astronomers primarily aimed to detect, characterize and validate new extrasolar planets. For this work, 10 amateur astronomers looked for planetary signals by visually inspecting the 20,427 light curves of K2 campaign 18 (C18). They found 42 planet candidates, of which 18 are new detections and 24 had been detected in the overlapping C5 by previous works. We used archival photometric and spectroscopic observations, as well as new high-spatial resolution images in order to carry out a complete analysis of the candidates found, including a homogeneous characterization of the host stars, transit modeling, search for transit timing variations and statistical validation. As a result, we report four new planets (K2-XXX b, K2-XXX b, K2-XXX b, and K2-XXX b) and 14 planet candidates. Besides, we refine the transit ephemeris of the previously published planets and candidates by modeling C5, C16 (when available) and C18 photometric data jointly, largely improving the period and mid-transit time precision. Regarding individual systems, we highlight the new planet K2-XXX b and candidate EPIC 211537087.02 being near a 2:1 period commensurability, the detection of significant TTVs in the bright star K2-184 (V = 10.35), the location of K2-103 b inside the habitable zone according to optimistic models, the detection of a new single transit in the known system K2-274, and the disposition reassignment of K2-120 b, which we consider as a planet candidate as the origin of the signal can not be ascertained.

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

Cited by 24 publications

References 26 publications

97 Eclipsing Quadruple Star Candidates Discovered in TESS Full Frame Images

97 Eclipsing Quadruple Star Candidates Discovered in TESS Full Frame Images

A 2+1 + 1 quadruple star system containing the most eccentric, low-mass, short-period, eclipsing binary known

The K2-OjOS Project: New and revisited planets and candidates in K2 campaigns 5, 16, & 18

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