Search Results - "Stassun, Keivan G."

Two Young Eclipsing Binaries in Orion with Temperatures and Radii Affected by Spots and Third Bodies by Kounkel, Marina, Stassun, Keivan G.

“…Abstract In this work we present a model of two young eclipsing binaries in the Orion complex. Both heavily spotted, they present radii and temperatures that…”
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The Evolution of Stellar X-Ray Activity and Angular Momentum as Seen by eROSITA, TESS, and Gaia by Stassun, Keivan G., Kounkel, Marina

“…Abstract We have assembled a sample of ∼8200 stars with spectral types F5V–M5V, all having directly measured X-ray luminosities from eROSITA and rotation…”
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An observational correlation between stellar brightness variations and surface gravity by Bastien, Fabienne A., Stassun, Keivan G., Basri, Gibor, Pepper, Joshua

“…An analysis of archival data reveals an observational correlation between stellar brightness variations and surface gravity, allowing a determination of…”
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Predicting Granulation "Flicker" and Radial Velocity "Jitter" from Spectroscopic Observables by Tayar, Jamie, Stassun, Keivan G., Corsaro, Enrico

“…Surface granulation can be predicted with the mass, metallicity, and frequency of maximum oscillation power of a star. Using the orders-of-magnitude larger…”
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A GRANULATION "FLICKER"-BASED MEASURE OF STELLAR SURFACE GRAVITY by Bastien, Fabienne A., Stassun, Keivan G., Basri, Gibor, Pepper, Joshua

“…ABSTRACT In our previous work we found that high-quality light curves, such as those obtained by Kepler, may be used to measure stellar surface gravity via…”
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High atmospheric metal enrichment for a Saturn-mass planet by Bean, Jacob L., Xue, Qiao, August, Prune C., Lunine, Jonathan, Zhang, Michael, Thorngren, Daniel, Tsai, Shang-Min, Stassun, Keivan G., Schlawin, Everett, Ahrer, Eva-Maria, Ih, Jegug, Mansfield, Megan

“…Atmospheric metal enrichment (that is, elements heavier than helium, also called ‘metallicity’) is a key diagnostic of the formation of giant planets 1 – 3 …”
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Detecting New Visual Binaries in Gaia DR3 with Gaia and Two Micron All Sky Survey (2MASS) Photometry. II. Speckle Observations of 16 Low-separation Systems by Medan, Ilija, Lépine, Sébastien, Hartman, Zachary, Stassun, Keivan G.

“…Abstract Here we present speckle observations of 16 low-separation ( s < 30 au) high-probability candidate binaries from the catalog by Medan et al., where…”
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Stellar Multiplicity Meets Stellar Evolution and Metallicity: The APOGEE View by Badenes, Carles, Mazzola, Christine, Thompson, Todd A., Covey, Kevin, Freeman, Peter E., Walker, Matthew G., Moe, Maxwell, Troup, Nicholas, Nidever, David, Prieto, Carlos Allende, Andrews, Brett, Barbá, Rodolfo H., Beers, Timothy C., Bovy, Jo, Carlberg, Joleen K., Lee, Nathan De, Johnson, Jennifer, Lewis, Hannah, Majewski, Steven R., Pinsonneault, Marc, Sobeck, Jennifer, Stassun, Keivan G., Stringfellow, Guy S., Zasowski, Gail

“…We use the multi-epoch radial velocities acquired by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey to perform a large-scale…”
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Measurement of the Angular Momenta of Pre-main-sequence Stars: Early Evolution of Slow and Fast Rotators and Empirical Constraints on Spin-down Torque Mechanisms by Kounkel, Marina, Stassun, Keivan G., Hillenbrand, Lynne A., Hernández, Jesús, Serna, Javier, Curtis, Jason Lee

“…Abstract We use TESS full-frame imaging data to investigate the angular momentum evolution of young stars in the Orion Complex. We confirm recent findings that…”
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Multiple Stellar Flybys Sculpting the Circumstellar Architecture in RW Aurigae by Rodriguez, Joseph E., Loomis, Ryan, Cabrit, Sylvie, Haworth, Thomas J., Facchini, Stefano, Dougados, Catherine, Booth, Richard A., Jensen, Eric L. N., Clarke, Cathie J., Stassun, Keivan G., Dent, William R. F., Pety, Jérôme

“…We present high-resolution ALMA Band 6 and 7 observations of the tidally disrupted protoplanetary disks of the RW Aurigae binary. Our observations reveal tidal…”
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Stellar Rotation in M35: Mass-Period Relations, Spin-Down Rates, and Gyrochronology by Meibom, Søren, Mathieu, Robert D, Stassun, Keivan G

“…We present the results of a five month photometric time-series survey for stellar rotation over a 40' X 40' field centered on the 150 Myr open cluster M35. We…”
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TIME-SERIES PHOTOMETRY OF STARS IN AND AROUND THE LAGOON NEBULA. I. ROTATION PERIODS OF 290 LOW-MASS PRE-MAIN-SEQUENCE STARS IN NGC 6530 by HENDERSON, Calen B, STASSUN, Keivan G

“…We have conducted a long-term, wide-field, high-cadence photometric monitoring survey of ~50,000 stars in the Lagoon Nebula H II region. This first paper…”
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Tests of Disk-locking in T Tauri Stars of the Orion Nebula Cluster by Mueller, Margaret A., Johns-Krull, Christopher M., Stassun, Keivan G., Dixon, Don M.

“…Abstract We look for specific correlations predicted by magnetospheric accretion models for young stars that assume disk-locking using stellar and accretion…”
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Spectroscopic Distance, Mass, and Age Estimations for APOGEE DR17 by Stone-Martinez, Alexander, Holtzman, Jon A., Imig, Julie, Nitschelm, Christian, Stassun, Keivan G., Brownstein, Joel R.

“…Abstract We derive distances and masses of stars from the Sloan Digital Sky Survey (SDSS) Apache Point Observatory Galactic Evolution Experiment Data Release…”
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A Self-consistent Data-driven Model for Determining Stellar Parameters from Optical and Near-infrared Spectra by Sizemore, Logan, Llanes, Diego, Kounkel, Marina, Hutchinson, Brian, Stassun, Keivan G., Chandra, Vedant

“…Abstract Data-driven models, which apply machine learning to infer physical properties from large quantities of data, have become increasingly important for…”
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Stellar Rotation of T Tauri Stars in the Orion Star-forming Complex by Serna, Javier, Hernandez, Jesus, Kounkel, Marina, Manzo-Martínez, Ezequiel, Roman-Lopes, Alexandre, Román-Zúñiga, Carlos G., Batista, Maria Gracia, Pinzón, Giovanni, Calvet, Nuria, Briceño, Cesar, Tapia, Mauricio, Suárez, Genaro, Ramírez, Karla Peña, G. Stassun, Keivan, Covey, Kevin, Vargas-González, J., Fernández-Trincado, José G.

“…Abstract We present a large-scale study of stellar rotation for T Tauri stars in the Orion star-forming complex. We use the projected rotational velocity ( v…”
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The Origin of Weakened Magnetic Braking in Old Solar Analogs by Metcalfe, Travis S., Finley, Adam J., Kochukhov, Oleg, See, Victor, Ayres, Thomas R., Stassun, Keivan G., van Saders, Jennifer L., Clark, Catherine A., Godoy-Rivera, Diego, Ilyin, Ilya V., Pinsonneault, Marc H., Strassmeier, Klaus G., Petit, Pascal

“…Abstract The rotation rates of main-sequence stars slow over time as they gradually lose angular momentum to their magnetized stellar winds. The rate of…”
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The Color-period Diagram and Stellar Rotational Evolution—New Rotation Period Measurements in the Open Cluster M34 by Meibom, Søren, Mathieu, Robert D, Stassun, Keivan G, Liebesny, Paul, Saar, Steven H

“…We present the results of a 5 month photometric time-series survey for stellar rotation periods combined with a 4 year radial-velocity survey for membership…”
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The Empirical and Radiative Transfer Hybrid (EaRTH) Disk Model: Merging Analyses of Protoplanetary Dust Disk Mineralogy and Structure by Grimble, William, Kastner, Joel, Pinte, Christophe, Sargent, Beth, Principe, David A., Dickson-Vandervelde, Annie, Belén Aguayo, Aurora, Caceres, Claudio, Schreiber, Matthias R., Stassun, Keivan G.

“…Abstract Our understanding of how exoplanets form and evolve relies on analyses of both the mineralogy of protoplanetary disks and their detailed structures;…”
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K2 Optical Emission from OJ 287 and Other γ-Ray Blazars on Hours-to-weeks Timescales from 2014 to 2018 by Wehrle, Ann E., Carini, Michael, Wiita, Paul J., Pepper, Joshua, Gaudi, B. Scott, Pogge, Richard W., Stassun, Keivan G., Villanueva, Steven

“…Abstract We present second observations by K2 of OJ 287 and seven other γ -ray active galactic nuclei (AGNs) obtained in 2017–2018, second and third…”
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