Jason Jackiewicz
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View article: Asymptotic Giant Branch Mass-loss Rates and Metal Yields from Scaled Mixing-length and Mass-loss Parameters
Asymptotic Giant Branch Mass-loss Rates and Metal Yields from Scaled Mixing-length and Mass-loss Parameters Open
Stars on the asymptotic giant branch (AGB) enrich the interstellar medium with carbon, nitrogen, and dust, which in turn boost cooling and promote future generations of planet and star formation. They are poorly constrained observationally…
View article: Atmospheric Gravity Waves Modulated by the Magnetic Field Configuration
Atmospheric Gravity Waves Modulated by the Magnetic Field Configuration Open
Atmospheric gravity waves (AGWs) are buoyancy-driven waves excited by turbulent convection and contribute to the dynamics and energy transport of the lower solar atmosphere. We present high-resolution, multiwavelength observations from the…
View article: Apache Point Observatory Follow-up of ACcelerating Candidate ExopLanet Host Stars (APO ACCELS): Ages for 166 Accelerating Stars in the Northern Hemisphere
Apache Point Observatory Follow-up of ACcelerating Candidate ExopLanet Host Stars (APO ACCELS): Ages for 166 Accelerating Stars in the Northern Hemisphere Open
Directly imaged substellar companions with well-constrained ages and masses serve as vital empirical benchmarks for planet formation and evolution models. Potential benchmark companions can be identified from astrometric accelerations of t…
View article: The Sunspot Solar Observatory Data Archive: Continuing Operations at the Dunn Solar Telescope
The Sunspot Solar Observatory Data Archive: Continuing Operations at the Dunn Solar Telescope Open
The Sunspot Solar Observatory Data Archive (SSODA) stores data acquired with the suite of instruments at the Richard B. Dunn Solar Telescope (DST) from February 2018 to the present. The instrumentation at the DST continues to provide high …
View article: Abrupt Pulsation Resumptions in Deneb: An Update
Abrupt Pulsation Resumptions in Deneb: An Update Open
Deneb, the prototype Alpha Cygni variable, is a bright A2 Ia supergiant which shows irregular variability with a 12-day quasi-period, presumed to be caused by pulsations. At the 2023 AAVSO Annual Meeting we discussed radial velocity and ph…
View article: Perspectives of Jovian seismology: sounding the interior of the Gas Giants through oscillations
Perspectives of Jovian seismology: sounding the interior of the Gas Giants through oscillations Open
Jupiter and Saturn played a major role in the formation and evolution of the Solar System. The internal structure of the gas giants was shaped during their birth process and still contains traces of this formation. A detailed description o…
View article: Deneb and the alpha Cygni Variables
Deneb and the alpha Cygni Variables Open
Deneb, the prototype alpha Cygni variable, is a blue-white supergiant that shows irregular variability with quasi-period around 12 days in brightness and radial velocity. Abt et al. (2023) found that larger amplitude 12-day variations appe…
View article: Abrupt Periodic Pulsation Resumptions in Deneb
Abrupt Periodic Pulsation Resumptions in Deneb Open
Deneb (alpha Cygni) is a bright (V magnitude 1.25) blue-white supergiant (spectral type A2 Ia) which shows variability in both radial velocity and photometric measurements. H. Abt reviewed radial velocity measurements by Paddock (1935) usi…
View article: Improvement of Doppler measurements thanks to adaptive optics: the case of JOVIAL+AOC
Improvement of Doppler measurements thanks to adaptive optics: the case of JOVIAL+AOC Open
International audience
View article: Three-dimensional Atmospheric Dynamics of Jupiter from Ground-based Doppler Imaging Spectroscopy in the Visible
Three-dimensional Atmospheric Dynamics of Jupiter from Ground-based Doppler Imaging Spectroscopy in the Visible Open
We present three-dimensional (3D) maps of Jupiter’s atmospheric circulation at cloud-top level from Doppler-imaging data obtained in the visible domain with JIVE, the second node of the JOVIAL network, which is mounted on the Dunn Solar Te…
View article: Amplitude Variability in gamma Dor and delta Sct Stars Observed by Kepler
Amplitude Variability in gamma Dor and delta Sct Stars Observed by Kepler Open
The NASA Kepler spacecraft data revealed a large number of new multimode nonradially pulsating gamma Dor and delta Sct variable stars. The Kepler high-precision long time-series photometry makes it possible to study amplitude variations of…
View article: Three-dimensional atmospheric dynamics of Jupiter from ground-based Doppler imaging spectroscopy in the visible
Three-dimensional atmospheric dynamics of Jupiter from ground-based Doppler imaging spectroscopy in the visible Open
We present three-dimensional (3D) maps of Jupiter's atmospheric circulation at cloud-top level from Doppler-imaging data obtained in the visible domain with JIVE, the second node of the JOVIAL network, which is mounted on the Dunn Solar Te…
View article: Inferring the Solar Meridional Circulation Flow Profile by Applying Bayesian Methods to Time–Distance Helioseismology
Inferring the Solar Meridional Circulation Flow Profile by Applying Bayesian Methods to Time–Distance Helioseismology Open
Mapping the large-scale subsurface plasma flow profile within the Sun has been attempted using various methods for several decades. One such flow in particular is the meridional circulation, for which numerous studies have been published. …
View article: Inferring the Solar Meridional Circulation Flow Profile by Applying Bayesian Methods to Time-distance Helioseismology
Inferring the Solar Meridional Circulation Flow Profile by Applying Bayesian Methods to Time-distance Helioseismology Open
Mapping the large-scale subsurface plasma flow profile within the Sun has been attempted using various methods for several decades. One such flow in particular is the meridional circulation, for which numerous studies have been published. …
View article: Challenges in Cepheid Evolution and Pulsation Modeling
Challenges in Cepheid Evolution and Pulsation Modeling Open
Cepheids have long been used as standard candles to determine distances around the Milky Way and to nearby galaxies. A discrepancy still remains for Hubble Constant determinations using Cepheids vs. the cosmic microwave background or calib…
View article: Multi-Height Observations of Atmospheric Gravity Waves at Solar Disk Center
Multi-Height Observations of Atmospheric Gravity Waves at Solar Disk Center Open
Atmospheric gravity waves (AGWs) are low-frequency, buoyancy-driven waves that are generated by turbulent convection and propagate obliquely throughout the solar atmosphere. Their proposed energy contribution to the lower solar atmosphere …
View article: Multiheight Observations of Atmospheric Gravity Waves at Solar Disk Center
Multiheight Observations of Atmospheric Gravity Waves at Solar Disk Center Open
Atmospheric gravity waves (AGWs) are low-frequency, buoyancy-driven waves that are generated by turbulent convection and propagate obliquely throughout the solar atmosphere. Their proposed energy contribution to the lower solar atmosphere …
View article: Variable Blue Straggler Stars in the Open Cluster NGC 6819 Observed in the Kepler “Superstamp” Field
Variable Blue Straggler Stars in the Open Cluster NGC 6819 Observed in the Kepler “Superstamp” Field Open
NGC 6819 is an open cluster of age 2.4 Gyr that was in the NASA Kepler spacecraft’s field of view from 2009 to 2013. The central part of the cluster was observed in a 200 × 200 pixel “superstamp” during these four years in 30 minute cadenc…
View article: Variable Blue Straggler Stars in Open Cluster NGC 6819 Observed in the Kepler 'Superstamp' Field
Variable Blue Straggler Stars in Open Cluster NGC 6819 Observed in the Kepler 'Superstamp' Field Open
NGC 6819 is an open cluster of age 2.4 Gyr that was in the NASA Kepler spacecraft field of view from 2009 to 2013. The central part of the cluster was observed in a 200 x 200 pixel `superstamp' during these four years in 30-minute cadence …
View article: KIC 7955301: A hierarchical triple system with eclipse timing variations and an oscillating red giant
KIC 7955301: A hierarchical triple system with eclipse timing variations and an oscillating red giant Open
KIC 7955301 is a hierarchical triple system with clear eclipse timing and depth variations that was discovered by the Kepler satellite during its original mission. It is composed of a non-eclipsing primary star at the bottom of the red gia…
View article: Revisiting the δ Scuti star FG Virginis using Kepler K2 and TESS data
Revisiting the δ Scuti star FG Virginis using Kepler K2 and TESS data Open
FG Virginis is a δ Scuti variable star that was the target of several ground-based multisite photometric campaigns from 1992 to 2004. Over 75 pulsation frequencies were detected (Breger et al., Astron. Astrophys., 2005, 435, 955–965), more…
View article: Exploring Jupiter's Polar Deformation Lengths with High-resolutionShallow Water Modeling
Exploring Jupiter's Polar Deformation Lengths with High-resolutionShallow Water Modeling Open
The polar regions of Jupiter host a myriad of dynamically interesting phenomena, including vortex configurations, folded-filamentary regions (FFRs), and chaotic flows. Juno observations have provided unprecedented views of the high latitud…
View article: Exploring Jupiter's Polar Deformation Lengths with High Resolution Shallow Water Modeling
Exploring Jupiter's Polar Deformation Lengths with High Resolution Shallow Water Modeling Open
The polar regions of Jupiter host a myriad of dynamically interesting phenomena including vortex configurations, folded-filamentary regions (FFRs), and chaotic flows. Juno observations have provided unprecedented views of the high latitude…
View article: Do Metallic-Line A (Am) Stars Pulsate? Results from TESS Cycles 1-3
Do Metallic-Line A (Am) Stars Pulsate? Results from TESS Cycles 1-3 Open
Metallic-line A (Am) stars are main-sequence stars of around twice the mass of the Sun that show element abundance peculiarities in their spectra. The radiative levitation and diffusive settling processes responsible for these abundance an…
View article: Characterizing Variability in Bright Metallic-Line A (Am) Stars Using Data from the NASA TESS Spacecraft
Characterizing Variability in Bright Metallic-Line A (Am) Stars Using Data from the NASA TESS Spacecraft Open
Metallic-line A (Am) stars are main-sequence stars of around twice the mass of the Sun that show element abundance peculiarities in their spectra. The radiative levitation and diffusive settling processes responsible for these abundance an…
View article: Solar-Like Oscillators in the Kepler Era: A Review
Solar-Like Oscillators in the Kepler Era: A Review Open
Many late-type stars across the Milky Way exhibit observable pulsations similar to our Sun that open up a window into stellar interiors. The NASA Kepler mission, a space-based photometric telescope, measured the micro-magnitude luminosity …
View article: Characteristics and performances of an interferometric Doppler imager installed at the 188 cm telescope of Okayama Observatory
Characteristics and performances of an interferometric Doppler imager installed at the 188 cm telescope of Okayama Observatory Open
International audience