Asteroseismic masses average 1.29 Msun for Ba dwarfs versus 1.96 Msun for Ba giants, supporting main-sequence accretion evolution from dwarfs to giants, though models fail to match the observed [hs/ls] ratio.
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The Lomb-Scargle periodogram is a well-known algorithm for detecting and characterizing periodic signals in unevenly-sampled data. This paper presents a conceptual introduction to the Lomb-Scargle periodogram and important practical considerations for its use. Rather than a rigorous mathematical treatment, the goal of this paper is to build intuition about what assumptions are implicit in the use of the Lomb-Scargle periodogram and related estimators of periodicity, so as to motivate important practical considerations required in its proper application and interpretation.
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representative citing papers
Detection of a 0.1802-day periodic signal in TESS photometry of slow-rising nova PGIR22akgylf interpreted as orbital modulation from binary distortion of the envelope during common-envelope interaction.
GRAVITY+ observations yield a 12CO/13CO ratio of 91^{+24}_{-17} in β Pictoris b consistent with solar/ISM values and a tentative 1.4% atmospheric variability amplitude.
AGILE archival data reveal gamma-ray flares from a source matching IGR J17354-3255, with orbital phase correlation supporting physical association and high-energy emission from SFXTs.
Refined statistical pipeline on Gaia FPR residuals detects 343 binary asteroid candidates, with 88% fewer false positives in noise simulations and overlaps with 9 known binaries.
The first eclipsing CEMP candidate is identified in a 1.224-day binary, with 3.5% of dwarf carbon stars showing short-period variability consistent with tidally locked post-common envelope systems and supporting wind capture for carbon enhancement.
A 1-norm robust periodogram is introduced for non-Gaussian irregular time series and applied to 259 quasars, identifying 49 with quasi-periodic signals above 3σ.
Optical-MIR lags of 39.1 days and 79.4 days are measured in Mrk 42 and Mrk 493, yielding dust reverberation radii of 0.032 pc and 0.065 pc with R_dust/R_BLR ratios of approximately 6-7.
Detection of a persistent ~433-day optical QPO in blazar 3C 454.3 at 2.53σ significance using Lomb-Scargle, WWZ, and PDM methods, with a new test for seasonal gaps.
Sgr A* exhibits a white-noise-like flat variability regime in its 340 GHz flux on timescales below 2.3 to 6.3 minutes, transitioning to red-noise-like behavior at longer timescales, with no evidence for narrow periodic signals.
Spitzer mid-IR monitoring of all known Y dwarfs yields variability fractions of 35-75% that, when combined with L/T dwarf data, weakly support condensate cloud variations as the driver of brown dwarf variability.
GSC 08227-00723 is classified as a new AH Pic-type nova-like variable with recurrent stunted outbursts and an exceptionally large positive superhump excess of approximately 0.19.
A search of repeating FRBs identifies RM flare candidates in FRB 20121102A, FRB 20201124A, and FRB 20180916B, suggesting such events may be common and tied to dynamic magneto-ionic environments.
The TESS All-Sky Rotation Survey provides periods for 1,046,317 stars within 500 pc, with an estimated 93% being true rotation periods, and includes a method to correct half-period aliases.
An MCMC-based period search method recovers previously reported candidate periods in FRB 20201124A observations.
EP J174942.2-384834 is classified as a very faint X-ray transient black hole candidate based on its hard X-ray spectra, optical/UV brightening correlated with X-rays, and lack of radio emission.
2CXO J0507 is a polar-type magnetic cataclysmic variable featuring a white dwarf with B ≈ 30 MG and an orbital period of 2.34 hours, identified through multiwavelength archival and follow-up data.
Linear stability analysis and non-linear hydrodynamical simulations link the stochastic low-frequency variability of ε Ori to strange-mode instabilities that excite finite-amplitude pulsations.
ZTF data yielded 32 robust ultracool dwarf rotation periods including 12 new detections, with a trend of decreasing periods toward later spectral types in dwarfs older than 100 Myr.
A homogeneous search of TESS Cycle 7 20-second cadence light curves identifies 73 rapid oscillators (24 white dwarfs, 31 hot subdwarfs, 18 A-F stars) with measured frequencies and amplitudes after vetting.
Simulations predict very limited transiting exoplanet confirmations from LSST due to observing cadence constraints, with only a few possible in DDF for hot planets on M dwarfs.
A synthesis of observational data on red novae as stellar merger events, including outburst properties, progenitor diversity, and long-term remnants.
citing papers explorer
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Unveiling the nature of barium stars. I. Asteroseismic masses and the evolutionary link between Ba dwarfs and giants
Asteroseismic masses average 1.29 Msun for Ba dwarfs versus 1.96 Msun for Ba giants, supporting main-sequence accretion evolution from dwarfs to giants, though models fail to match the observed [hs/ls] ratio.
-
TESS detection of periodic brightness variations during the rise of classical nova PGIR22akgylf
Detection of a 0.1802-day periodic signal in TESS photometry of slow-rising nova PGIR22akgylf interpreted as orbital modulation from binary distortion of the envelope during common-envelope interaction.
-
$^{13}$CO and potential variability in $\beta$ Pictoris b with GRAVITY+
GRAVITY+ observations yield a 12CO/13CO ratio of 91^{+24}_{-17} in β Pictoris b consistent with solar/ISM values and a tentative 1.4% atmospheric variability amplitude.
-
AGILE detection of transient {\gamma}-ray emission from the region of the supergiant fast X-ray transient source IGR J17354-3255
AGILE archival data reveal gamma-ray flares from a source matching IGR J17354-3255, with orbital phase correlation supporting physical association and high-energy emission from SFXTs.
-
Follow the wobble: Statistical methods to detect astrometric binary asteroids in Gaia FPR
Refined statistical pipeline on Gaia FPR residuals detects 343 binary asteroid candidates, with 88% fewer false positives in noise simulations and overlaps with 9 known binaries.
-
An eclipsing CEMP candidate discovered in a search for dwarf carbon stars in post-common envelope binaries
The first eclipsing CEMP candidate is identified in a 1.224-day binary, with 3.5% of dwarf carbon stars showing short-period variability consistent with tidally locked post-common envelope systems and supporting wind capture for carbon enhancement.
-
Robust 1-norm periodograms for analysis of noisy non-Gaussian time series with irregular cadences: Application to VLBI astrometry of quasars
A 1-norm robust periodogram is introduced for non-Gaussian irregular time series and applied to 259 quasars, identifying 49 with quasi-periodic signals above 3σ.
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The 2MIG isolated AGNs. 3. Optical--IR variability and dust reverberation in the NLSy1 galaxies Mrk~42 and Mrk~493
Optical-MIR lags of 39.1 days and 79.4 days are measured in Mrk 42 and Mrk 493, yielding dust reverberation radii of 0.032 pc and 0.065 pc with R_dust/R_BLR ratios of approximately 6-7.
-
Detection of optical quasi-periodic oscillation in the blazar 3C 454.3
Detection of a persistent ~433-day optical QPO in blazar 3C 454.3 at 2.53σ significance using Lomb-Scargle, WWZ, and PDM methods, with a new test for seasonal gaps.
-
Short timescale variation in the submillimeter flux of Sagittarius A*
Sgr A* exhibits a white-noise-like flat variability regime in its 340 GHz flux on timescales below 2.3 to 6.3 minutes, transitioning to red-noise-like behavior at longer timescales, with no evidence for narrow periodic signals.
-
A Spitzer Space Telescope Exploration Science Program to Search for Y Dwarf Variability
Spitzer mid-IR monitoring of all known Y dwarfs yields variability fractions of 35-75% that, when combined with L/T dwarf data, weakly support condensate cloud variations as the driver of brown dwarf variability.
-
GSC 08227-00723: An Unusually Large PSH Excess AH Pic Candidate
GSC 08227-00723 is classified as a new AH Pic-type nova-like variable with recurrent stunted outbursts and an exceptionally large positive superhump excess of approximately 0.19.
-
A Search for Rotation Measure Flare Candidates in Repeating Fast Radio Bursts
A search of repeating FRBs identifies RM flare candidates in FRB 20121102A, FRB 20201124A, and FRB 20180916B, suggesting such events may be common and tied to dynamic magneto-ionic environments.
-
The TESS All-Sky Rotation Survey: Periods for 1,046,317 Stars Within 500 pc
The TESS All-Sky Rotation Survey provides periods for 1,046,317 stars within 500 pc, with an estimated 93% being true rotation periods, and includes a method to correct half-period aliases.
-
Revisiting the Reported Period of FRB 20201124A Using MCMC Methods
An MCMC-based period search method recovers previously reported candidate periods in FRB 20201124A observations.
-
Multi-wavelength outburst activity from EP J174942.2-384834: a very faint X-ray transient discovered by Einstein Probe
EP J174942.2-384834 is classified as a very faint X-ray transient black hole candidate based on its hard X-ray spectra, optical/UV brightening correlated with X-rays, and lack of radio emission.
-
Multiwavelength Characterization of a New Magnetic Cataclysmic Variable 2CXO J050740.7-091337
2CXO J0507 is a polar-type magnetic cataclysmic variable featuring a white dwarf with B ≈ 30 MG and an orbital period of 2.34 hours, identified through multiwavelength archival and follow-up data.
-
On the origin of variability in $\alpha$ Cygni variable $\epsilon$ Ori (HD 37128) using TESS observations and modelling
Linear stability analysis and non-linear hydrodynamical simulations link the stochastic low-frequency variability of ε Ori to strange-mode instabilities that excite finite-amplitude pulsations.
-
A Search for Variability of Ultracool Dwarfs with the Zwicky Transient Facility
ZTF data yielded 32 robust ultracool dwarf rotation periods including 12 new detections, with a trend of decreasing periods toward later spectral types in dwarfs older than 100 Myr.
-
A Search for High Frequency Oscillations in TESS Cycle 7
A homogeneous search of TESS Cycle 7 20-second cadence light curves identifies 73 rapid oscillators (24 white dwarfs, 31 hot subdwarfs, 18 A-F stars) with measured frequencies and amplitudes after vetting.
-
Predictions of Transiting Exoplanet Confirmations from Rubin LSST Surveys
Simulations predict very limited transiting exoplanet confirmations from LSST due to observing cadence constraints, with only a few possible in DDF for hot planets on M dwarfs.
-
Red novae, their progenitors, and remnants
A synthesis of observational data on red novae as stellar merger events, including outburst properties, progenitor diversity, and long-term remnants.
- Random Polarization Position Angle Behaviors across Bursts of Repeating Fast Radio Bursts