Search Results - "Cunha, Katia"

A Spectroscopic Analysis of the California-Kepler Survey Sample. I. Stellar Parameters, Planetary Radii, and a Slope in the Radius Gap by Martinez, Cintia F., Cunha, Katia, Ghezzi, Luan, Smith, Verne V.

“…We present results from a quantitative spectroscopic analysis conducted on archival Keck/HIRES high-resolution spectra from the California-Kepler Survey (CKS)…”
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Mapping the Galactic Metallicity Gradient with Open Clusters: The State-of-the-Art and Future Challenges by Spina, Lorenzo, Magrini, Laura, Cunha, Katia

“…In this paper, we make use of data collected for open cluster members by high-resolution spectroscopic surveys and programmes (i.e., APOGEE, Gaia-ESO, GALAH,…”
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A Metallicity Study of F, G, K, and M Dwarfs in the Coma Berenices Open Cluster from the APOGEE Survey by Souto, Diogo, Cunha, Katia, Smith, Verne V.

“…Abstract We present a study of metallicities in a sample of main-sequence stars with spectral types M , K , G , and F ( T eff ∼3200–6500K and log g ∼ 4.3–5.0…”
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The Lazy Giants: APOGEE Abundances Reveal Low Star Formation Efficiencies in the Magellanic Clouds by Nidever, David L., Hasselquist, Sten, Hayes, Christian R., Hawkins, Keith, Povick, Joshua, Majewski, Steven R., Smith, Verne V., Anguiano, Borja, Stringfellow, Guy S., Sobeck, Jennifer S., Cunha, Katia, Beers, Timothy C., Bestenlehner, Joachim M., Cohen, Roger E., Garcia-Hernandez, D. A., Jönsson, Henrik, Nitschelm, Christian, Shetrone, Matthew, Lacerna, Ivan, Allende Prieto, Carlos, Beaton, Rachael L., Dell'Agli, Flavia, Fernández-Trincado, José G., Feuillet, Diane, Gallart, Carme, Hearty, Fred R., Holtzman, Jon, Manchado, Arturo, Muñoz, Ricardo R., O'Connell, Robert, Rosado, Margarita

“…We report the first APOGEE metallicities and -element abundances measured for 3600 red giant stars spanning a large radial range of both the Large (LMC) and…”
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A Comprehensive Study of Open Cluster Chemical Homogeneity Using APOGEE and Milky Way Mapper Abundances by Sinha, Amaya, Zasowski, Gail, Frinchaboy, Peter, Cunha, Katia, Souto, Diogo, Tayar, Jamie, Stassun, Keivan

“…Abstract Stars in an open cluster are assumed to have formed from a broadly homogeneous distribution of gas, implying that they should be chemically…”
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Abundances of Planetary Nebulae and Evolved Stars: Iron and Sulfur Depletion, and Carbon and Nitrogen Enrichment, in Low- and Intermediate-mass Stellar Populations in the Milky Way by Stanghellini, Letizia, Smith, Verne V., Cunha, Katia, Prantzos, Nikos

“…Abstract We research the elemental abundances in Galactic planetary nebulae (PNe) compared with those of their stellar progenitors (red giant branch and…”
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Boron Abundances in Early B Dwarfs of the Galactic Open Cluster NGC 3293 by Proffitt, Charles R., Jin, Harim, Daflon, Simone, Lennon, Daniel J., Langer, Norbert, Cunha, Katia, Monroe, Talawanda

“…Abstract New boron abundances or upper limits have been determined for eight early B stars in the young Galactic open cluster NGC 3293, using UV spectra…”
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LITHIUM-RICH GIANTS IN GLOBULAR CLUSTERS by Kirby, Evan N, Guhathakurta, Puragra, Zhang, Andrew J, Hong, Jerry, Guo, Michelle, Guo, Rachel, Cohen, Judith G, Cunha, Katia

“…ABSTRACT Although red giants deplete lithium on their surfaces, some giants are Li-rich. Intermediate-mass asymptotic giant branch (AGB) stars can generate Li…”
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Magnetic Fields in a Sample of Planet-hosting M Dwarf Stars from Kepler, K2, and TESS Observed by APOGEE by Wanderley, Fábio, Cunha, Katia, Smith, Verne V., Kochukhov, Oleg, Souto, Diogo, Allende Prieto, C., Mahadevan, Suvrath, Majewski, Steven R., Muirhead, Philip S., Pinsonneault, Marc, Terrien, Ryan

“…Abstract Stellar magnetic fields have a major impact on space weather around exoplanets orbiting low-mass stars. From an analysis of Zeeman-broadened Fe i…”
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Stellar Characterization and a Chromospheric Activity Analysis of a K2 Sample of Planet-hosting Stars by Loaiza-Tacuri, V., Cunha, Katia, Smith, Verne V., Quispe-Huaynasi, F., Costa-Almeida, Ellen, Ghezzi, Luan, Melendez, Jorge

“…Abstract Effective temperatures, surface gravities, and iron abundances were derived for 109 stars observed by the K2 mission using equivalent width…”
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IDENTIFICATION OF NEODYMIUM IN THE APOGEE H-BAND SPECTRA by Hasselquist, Sten, Shetrone, Matthew, Cunha, Katia, Smith, Verne V., Holtzman, Jon, Lawler, J. E., Prieto, Carlos Allende, Beers, Timothy C., Chojnowski, Drew, Fernández-Trincado, J. G., García-Hernández, D. A., Hearty, Fred R., Majewski, Steven R., Pereira, C. B., Placco, Vinicius M., Villanova, Sandro, Zamora, Olga

“…ABSTRACT We present the detection of 10 lines of singly ionized neodymium (Nd ii, Z = 60) in H-band spectra using observations from the SDSS-III Apache Point…”
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A Tale of Two Disks: Mapping the Milky Way with the Final Data Release of APOGEE by Imig, Julie, Price, Cathryn, Holtzman, Jon A., Stone-Martinez, Alexander, Majewski, Steven R., Weinberg, David H., Johnson, Jennifer A., Allende Prieto, Carlos, Beaton, Rachael L., Beers, Timothy C., Bizyaev, Dmitry, Blanton, Michael R., Brownstein, Joel R., Cunha, Katia, Fernández-Trincado, José G., Feuillet, Diane K., Hasselquist, Sten, Hayes, Christian R., Jönsson, Henrik, Lane, Richard R., Lian, Jianhui, Mészáros, Szabolcs, Nidever, David L., Robin, Annie C., Shetrone, Matthew, Smith, Verne, Wilson, John C.

“…Abstract We present new maps of the Milky Way disk showing the distribution of metallicity ([Fe/H]), α -element abundances ([Mg/Fe]), and stellar age, using a…”
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Fluorine in the Solar Neighborhood: The Need for Several Cosmic Sources by Ryde, Nils, Jönsson, Henrik, Mace, Gregory, Cunha, Katia, Spitoni, Emanuele, Af ar, Melike, Jaffe, Daniel, Forsberg, Rebecca, Kaplan, Kyle F., Kidder, Benjamin T., Lee, Jae-Joon, Oh, Heeyoung, Smith, Verne V., Sneden, Christopher, Sokal, Kimberly R., Strickland, Emily, Thorsbro, Brian

“…The cosmic origin of fluorine is still not well constrained. Several nucleosynthetic channels at different phases of stellar evolution have been suggested, but…”
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Using Photometrically Derived Properties of Young Stars to Refine TESS’s Transiting Young Planet Survey Completeness by Fernandes, Rachel B., Hardegree-Ullman, Kevin K., Pascucci, Ilaria, Bergsten, Galen J., Mulders, Gijs D., Cunha, Katia, Mamajek, Eric E., Pearson, Kyle A., Feiden, Gregory A., Curtis, Jason L.

“…Abstract The demographics of young exoplanets can shed light on their formation and evolution processes. Exoplanet properties are derived from the properties…”
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Stellar Characterization of M Dwarfs from the APOGEE Survey: A Calibrator Sample for M-dwarf Metallicities by Souto, Diogo, Cunha, Katia, Smith, Verne V., Allende Prieto, C., Burgasser, Adam, Covey, Kevin, García-Hernández, D. A., Holtzman, Jon A., Johnson, Jennifer A., Jönsson, Henrik, Mahadevan, Suvrath, Majewski, Steven R., Masseron, Thomas, Shetrone, Matthew, Rojas-Ayala, Bárbara, Sobeck, Jennifer, Stassun, Keivan G., Terrien, Ryan, Teske, Johanna, Wanderley, Fábio, Zamora, Olga

“…We present spectroscopic determinations of the effective temperatures, surface gravities, and metallicities for 21 M dwarfs observed at high resolution (R ∼…”
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Stellar Characterization and Chemical Abundances of Exoplanet-hosting M Dwarfs from APOGEE Spectra: Future JWST Targets by Melo, Edypo, Souto, Diogo, Cunha, Katia, Smith, Verne V., Wanderley, Fábio, Grilo, Vinicius, Camara, Deusalete, Murta, Kely, Hejazi, Neda, Crossfield, Ian J. M., Teske, Johanna, Luque, Rafael, Zhang, Michael, Bean, Jacob

“…Abstract Exoplanets hosting M dwarfs are the best targets to characterize Earth-like or super-Earth planetary atmospheres with the James Webb Space Telescope…”
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High-resolution Elemental Abundance Measurements of Cool JWST Planet Hosts Using AutoSpecFit: An Application to the Sub-Neptune K2-18b’s Host M Dwarf by Hejazi, Neda, Crossfield, Ian J. M., Souto, Diogo, Brande, Jonathan, Nordlander, Thomas, Marfil, Emilio, Cunha, Katia, Coria, David R., Maas, Zachary G., Polanski, Alex S., Hinkel, Natalie R., Hand, Joseph E.

“…Abstract We present an in-depth, high-resolution spectroscopic analysis of the M dwarf K2-18, which hosts a sub-Neptune exoplanet in its habitable zone. We…”
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Magnetic Fields in M-dwarf Members of the Pleiades Open Cluster Using APOGEE Spectra by Wanderley, Fábio, Cunha, Katia, Kochukhov, Oleg, Smith, Verne V., Souto, Diogo, Cao, Lyra, Covey, Kevin, Majewski, Steven R., Martinez, Cintia, Muirhead, Philip S., Pinsonneault, Marc, Allende Prieto, C., Stassun, Keivan G.

“…Abstract Average magnetic field measurements are presented for 62 M-dwarf members of the Pleiades open cluster, derived from Zeeman-enhanced Fe i lines in the…”
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Galactic Metallicity Gradients Derived from a Sample of OB Stars by Daflon, Simone, Cunha, Katia

“…The distribution of stellar abundances along the Galactic disk is an important constraint for models of chemical evolution and Galaxy formation. In this study…”
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The Bulge Metallicity Distribution from the APOGEE Survey by García Pérez, Ana E., Ness, Melissa, Robin, Annie C., Martinez-Valpuesta, Inma, Sobeck, Jennifer, Zasowski, Gail, Majewski, Steven R., Bovy, Jo, Prieto, Carlos Allende, Cunha, Katia, Girardi, Léo, Mészáros, Szabolcs, Nidever, David, Schiavon, Ricardo P., Schultheis, Mathias, Shetrone, Matthew, Smith, Verne V.

“…The Apache Point Observatory Galactic Evolution Experiment (APOGEE) provides spectroscopic information of regions of the inner Milky Way, which are…”
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