Search Results - "Santos, Ângela R. G."

Perspectives on the physics of late-type stars from beyond low earth orbit, the moon and mars by Mathur, Savita, Santos, Ângela R. G.

“…With the new discoveries enabled thanks to the recent space missions, stellar physics is going through a revolution. However, these discoveries opened the door…”
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A 4 Gyr M-dwarf Gyrochrone from CFHT/MegaPrime Monitoring of the Open Cluster M67 by Dungee, Ryan, van Saders, Jennifer, Gaidos, Eric, Chun, Mark, García, Rafael A., Magnier, Eugene A., Mathur, Savita, Santos, Ângela R. G.

“…Abstract We present stellar rotation periods for late K- and early M-dwarf members of the 4 Gyr old open cluster M67 as calibrators for gyrochronology and…”
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Chemical Evolution in the Milky Way: Rotation-based Ages for APOGEE-Kepler Cool Dwarf Stars by Claytor, Zachary R., Saders, Jennifer L. van, Santos, Ângela R. G., García, Rafael A., Mathur, Savita, Tayar, Jamie, Pinsonneault, Marc H., Shetrone, Matthew

“…We use models of stellar angular momentum evolution to determine ages for ∼500 stars in the APOGEE-Kepler Cool Dwarfs sample. We focus on lower-main-sequence…”
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What future awaits the Sun? by Santos, Ângela R G, Mathur, Savita

“…Stellar data question the notion that the Sun is stemming its magnetic activity cycle The Sun and other similar (solar-like) stars have an internal magnetic…”
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Brightness Fluctuation Spectra of Sun-like Stars. I. The Mid-frequency Continuum by Brown, Timothy M., García, Rafael A., Mathur, Savita, Metcalfe, Travis S., Santos, Ângela R. G.

“…Abstract We analyze space-based time-series photometry of Sun-like stars, mostly in the Pleiades, but also field stars and the Sun itself. We focus on…”
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Learning about the latitudinal distribution of starspots through the periodogram analysis of photometric data by Santos, Ângela R. G., Cunha, Margarida S., Avelino, Pedro P., García, Rafael A., Mathur, Savita

“…Starspots are cooler and darker than the stellar surface. Therefore, the emitted flux of a star changes when spots are visible on its surface. The presence of…”
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On the relation between activity-related frequency shifts and the sunspot distribution over the solar cycle 23 by Santos, Ângela R. G., Cunha, Margarida S., Avelino, Pedro P., Chaplin, William J., Campante, Tiago L.

“…The activity-related variations in the solar acoustic frequencies have been known for 30 years. However, the importance of the different contributions is still…”
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The Influence of Metallicity on Stellar Differential Rotation and Magnetic Activity by Karoff, Christoffer, Metcalfe, Travis S., Santos, Ângela R. G., Montet, Benjamin T., Isaacson, Howard, Witzke, Veronika, Shapiro, Alexander I., Mathur, Savita, Davies, Guy R., Lund, Mikkel N., Garcia, Rafael A., Brun, Allan S., Salabert, David, Avelino, Pedro P., Saders, Jennifer van, Egeland, Ricky, Cunha, Margarida S., Campante, Tiago L., Chaplin, William J., Krivova, Natalie, Solanki, Sami K., Stritzinger, Maximilian, Knudsen, Mads F.

“…Observations of Sun-like stars over the past half-century have improved our understanding of how magnetic dynamos, like that responsible for the 11 yr solar…”
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Kepler main-sequence solar-like stars: surface rotation and magnetic-activity evolution by Santos, Ângela R. G., Godoy-Rivera, Diego, Finley, Adam J., Mathur, Savita, García, Rafael A., Breton, Sylvain N., Broomhall, Anne-Marie

“…While the mission’s primary goal was focused on exoplanet detection and characterization, Kepler made and continues to make extraordinary advances in stellar…”
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Magnetic Activity Evolution of Solar-like Stars. I. S ph–Age Relation Derived from Kepler Observations by Mathur, Savita, Claytor, Zachary R., Santos, Ângela R. G., García, Rafael A., Amard, Louis, Bugnet, Lisa, Corsaro, Enrico, Bonanno, Alfio, Breton, Sylvain N., Godoy-Rivera, Diego, Pinsonneault, Marc H., van Saders, Jennifer

“…Abstract The ages of solar-like stars have been at the center of many studies such as exoplanet characterization or Galactic-archeology. While ages are usually…”
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The Evolution of Rotation and Magnetic Activity in 94 Aqr Aa from Asteroseismology with TESS by Metcalfe, Travis S., van Saders, Jennifer L., Basu, Sarbani, Buzasi, Derek, Chaplin, William J., Egeland, Ricky, Garcia, Rafael A., Gaulme, Patrick, Huber, Daniel, Reinhold, Timo, Schunker, Hannah, Stassun, Keivan G., Appourchaux, Thierry, Ball, Warrick H., Bedding, Timothy R., Deheuvels, Sébastien, González-Cuesta, Lucía, Handberg, Rasmus, Jiménez, Antonio, Kjeldsen, Hans, Li, Tanda, Lund, Mikkel N., Mathur, Savita, Mosser, Benoit, Nielsen, Martin B., Noll, Anthony, Çelik Orhan, Zeynep, Örtel, Sibel, Santos, Ângela R. G., Yildiz, Mutlu, Baliunas, Sallie, Soon, Willie

“…Most previous efforts to calibrate how rotation and magnetic activity depend on stellar age and mass have relied on observations of clusters, where isochrones…”
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Empirical solar/stellar cycle simulations by Santos, Ângela R. G., Cunha, Margarida S., Avelino, Pedro P.

“…As a result of the magnetic cycle, the properties of the solar oscillations vary periodically. With the recent discovery of manifestations of activity cycles…”
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Perspectives on the Physics of Late-Type Stars from Beyond Low Earth Orbit, the Moon and Mars by Mathur, Savita, Santos, Ângela R. G

“…With the new discoveries enabled thanks to the recent space missions, stellar physics is going through a revolution. However, these discoveries opened the door…”
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Rotational modulation in A and F stars: magnetic stellar spots or convective core rotation? by Henriksen, Andreea I, Antoci, Victoria, Saio, Hideyuki, Cantiello, Matteo, Kjeldsen, Hans, Kurtz, Donald W, Murphy, Simon J, Mathur, Savita, García, Rafael A, Santos, Ângela R G

“…ABSTRACT The Kepler mission revealed a plethora of stellar variability in the light curves of many stars, some associated with magnetic activity or stellar…”
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Robust asteroseismic properties of the bright planet host HD 38529 by Ball, Warrick H, Chaplin, William J, Nielsen, Martin B, González-Cuesta, Lucia, Mathur, Savita, Santos, Ângela R G, García, Rafael, Buzasi, Derek, Mosser, Benoît, Deal, Morgan, Stokholm, Amalie, Mosumgaard, Jakob Rørsted, Silva Aguirre, Victor, Nsamba, Benard, Campante, Tiago, Cunha, Margarida S, Ong, Joel, Basu, Sarbani, Örtel, Sibel, Çelik Orhan, Z, Yıldız, Mutlu, Stassun, Keivan, Kane, Stephen R, Huber, Daniel

“…ABSTRACT The Transiting Exoplanet Survey Satellite (TESS) is recording short-cadence, high duty-cycle timeseries across most of the sky, which presents the…”
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Asteroseismic constraints on active latitudes of solar-type stars: HD 173701 has active bands at higher latitudes than the Sun by Thomas, Alexandra E L, Chaplin, William J, Davies, Guy R, Howe, Rachel, Santos, Ângela R G, Elsworth, Yvonne, Miglio, Andrea, Campante, Tiago, Cunha, Margarida S

“…ABSTRACT We present a new method for determining the location of active bands of latitude on solar-type stars, which uses stellar-cycle-induced frequency…”
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Rotational modulation in A and F stars: Magnetic stellar spots or convective core rotation? by Henriksen, Andreea I, Antoci, Victoria, Saio, Hideyuki, Cantiello, Matteo, Kjeldsen, Hans, Kurtz, Donald W, Murphy, Simon J, Mathur, Savita, García, Rafael A, Santos, Ângela R. G

“…The Kepler mission revealed a plethora of stellar variability in the light curves of many stars, some associated with magnetic activity or stellar…”
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Influence of Magnetic Activity on the Determination of Stellar Parameters Through Asteroseismology by Pérez Hernández, Fernando, García, Rafael A., Mathur, Savita, Santos, Angela R. G., Régulo, Clara

“…Magnetic activity changes the gravito-acoustic modes of solar-like stars and in particular their frequencies. There is an angular-degree dependence that is…”
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Magnetic Activity Evolution of Solar-like Stars. I. Sph–Age Relation Derived from Kepler Observations by Mathur, Savita, Claytor, Zachary R, Santos, Ângela R G, García, Rafael A, Amard, Louis, Bugnet, Lisa, Corsaro, Enrico, Bonanno, Alfio, Breton, Sylvain N, Godoy-Rivera, Diego, Pinsonneault, Marc H, Jennifer van Saders

“…The ages of solar-like stars have been at the center of many studies such as exoplanet characterization or Galactic-archeology. While ages are usually computed…”
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Robust asteroseismic properties of the bright planet host HD 38529 by Ball, Warrick H, Chaplin, William J, Nielsen, Martin B, González-Cuesta, Lucia, Mathur, Savita, Santos, Ângela R. G, García, Rafael, Buzasi, Derek, Mosser, Benoît, Deal, Morgan, Stokholm, Amalie, Mosumgaard, Jakob Rørsted, Aguirre, Victor Silva, Nsamba, Benard, Campante, Tiago, Cunha, Margarida S, Ong, Joel, Basu, Sarbani, Örtel, Sibel, Orhan, Z. Çelik, Yıldız, Mutlu, Stassun, Keivan, Kane, Stephen R, Huber, Daniel

“…The Transiting Exoplanet Survey Satellite (TESS) is recording short-cadence, high duty-cycle timeseries across most of the sky, which presents the opportunity…”
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