Search Results - "Poppenhaeger, Katja"

Explaining the coexistence of large-scale and small-scale magnetic fields in fully convective stars by Yadav, Rakesh K., Christensen, Ulrich R., Morin, Julien, Gastine, Thomas, Reiners, Ansgar, Poppenhaeger, Katja, Wolk, Scott J.

“…Despite the lack of a shear-rich tachocline region low-mass fully convective stars are capable of generating strong magnetic fields, indicating that a dynamo…”
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A Chandra/LETGS Survey of Main-sequence Stars by Wood, Brian E., Laming, J. Martin, Warren, Harry P., Poppenhaeger, Katja

“…We analyze the X-ray spectra of 19 main-sequence stars observed by Chandra using its LETGS configuration. Emission measure (EM) distributions are computed…”
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The PEPSI Exoplanet Transit Survey (PETS). II. A Deep Search for Thermal Inversion Agents in KELT-20 b/MASCARA-2 b with Emission and Transmission Spectroscopy by Johnson, Marshall C., Wang 吉, Ji 王, Asnodkar, Anusha Pai, Bonomo, Aldo S., Gaudi, B. Scott, Henning, Thomas, Ilyin, Ilya, Keles, Engin, Malavolta, Luca, Mallonn, Matthias, Molaverdikhani, Karan, Nascimbeni, Valerio, Patience, Jennifer, Poppenhaeger, Katja, Scandariato, Gaetano, Schlawin, Everett, Shkolnik, Evgenya, Sicilia, Daniela, Sozzetti, Alessandro, Strassmeier, Klaus G., Veillet, Christian, Yan, Fei

“…Abstract Recent observations have shown that the atmospheres of ultrahot Jupiters (UHJs) commonly possess temperature inversions, where the temperature…”
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Centroid vetting of transiting planet candidates from the Next Generation Transit Survey by Günther, Maximilian N., Queloz, Didier, Gillen, Edward, McCormac, James, Bayliss, Daniel, Bouchy, Francois, Walker, Simon. R., West, Richard G., Eigmüller, Philipp, Smith, Alexis M. S., Armstrong, David J., Burleigh, Matthew, Casewell, Sarah L., Chaushev, Alexander P., Goad, Michael R., Grange, Andrew, Jackman, James, Jenkins, James S., Louden, Tom, Moyano, Maximiliano, Pollacco, Don, Poppenhaeger, Katja, Rauer, Heike, Raynard, Liam, Thompson, Andrew P. G., Udry, Stéphane, Watson, Christopher A., Wheatley, Peter J.

“…Abstract The Next Generation Transit Survey (NGTS), operating in Paranal since 2016, is a wide-field survey to detect Neptunes and super-Earths transiting…”
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How stars and planets interact: A look through the high‐energy window by Poppenhaeger, Katja

“…The architecture of exoplanetary systems is often different from the solar system, with some exoplanets being in close orbits around their host stars and…”
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Estimating photoevaporative mass loss of exoplanets with PLATYPOS by Ketzer, Laura, Poppenhaeger, Katja

“…We develop PLATYPOS (PLAneTarY PhOtoevaporation Simulator), a python code to perform planetary photoevaporative mass‐loss calculations for close‐in planets…”
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Identifying interesting planetary systems for future X‐ray observations by Foster, Grace, Poppenhaeger, Katja

“…X‐ray observations of star–planet systems are important to grow our understanding of exoplanets; these observations allow for studies of photoevaporation of…”
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Approaching a realistic force balance in geodynamo simulations by Yadav, Rakesh K., Gastine, Thomas, Christensen, Ulrich R., Wolk, Scott J., Poppenhaeger, Katja

“…Earth sustains its magnetic field by a dynamo process driven by convection in the liquid outer core. Geodynamo simulations have been successful in reproducing…”
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The Next Generation Transit Survey (NGTS) by Wheatley, Peter J, West, Richard G, Goad, Michael R, Jenkins, James S, Pollacco, Don L, Queloz, Didier, Rauer, Heike, Udry, Stéphane, Watson, Christopher A, Chazelas, Bruno, Eigmüller, Philipp, Lambert, Gregory, Genolet, Ludovic, McCormac, James, Walker, Simon, Armstrong, David J, Bayliss, Daniel, Bento, Joao, Bouchy, François, Burleigh, Matthew R, Cabrera, Juan, Casewell, Sarah L, Chaushev, Alexander, Chote, Paul, Csizmadia, Szilárd, Erikson, Anders, Faedi, Francesca, Foxell, Emma, Gänsicke, Boris T, Gillen, Edward, Grange, Andrew, Günther, Maximilian N, Hodgkin, Simon T, Jackman, James, Jordán, Andrés, Louden, Tom, Metrailler, Lionel, Moyano, Maximiliano, Nielsen, Louise D, Osborn, Hugh P, Poppenhaeger, Katja, Raddi, Roberto, Raynard, Liam, Smith, Alexis M S, Soto, Maritza, Titz-Weider, Ruth

“…Abstract We describe the Next Generation Transit Survey (NGTS), which is a ground-based project searching for transiting exoplanets orbiting bright stars. NGTS…”
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Numerical quantification of the wind properties of cool main sequence stars by Chebly, Judy J, Alvarado-Gómez, Julián D, Poppenhäger, Katja, Garraffo, Cecilia

“…ABSTRACT As a cool star evolves, it loses mass and angular momentum due to magnetized stellar winds that affect its rotational evolution. This change has…”
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Simulating the Space Weather in the AU Mic System: Stellar Winds and Extreme Coronal Mass Ejections by Alvarado-Gómez, Julián D., Cohen, Ofer, Drake, Jeremy J., Fraschetti, Federico, Poppenhaeger, Katja, Garraffo, Cecilia, Chebly, Judy, Ilin, Ekaterina, Harbach, Laura, Kochukhov, Oleg

“…Abstract Two close-in planets have been recently found around the M-dwarf flare star AU Microscopii (AU Mic). These Neptune-sized planets (AU Mic b and c) seem…”
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Planetary perturbers: flaring star–planet interactions in Kepler and TESS by Ilin, Ekaterina, Poppenhäger, Katja, Chebly, Judy, Ilić, Nikoleta, Alvarado-Gómez, Julián D

“…ABSTRACT In many star–planet systems discovered so far, the innermost planet orbits within only a few stellar radii. In these systems, planets could become in…”
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Constraining stellar tidal quality factors from planet‐induced stellar spin‐up by Ilić, Nikoleta, Poppenhaeger, Katja, Queiroz, Anna Barbara, Chiappini, Cristina

“…The dynamical evolution of tight star‐planet systems is influenced by tidal interactions between the star and the planet, as was shown recently. The rate at…”
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The first evidence of tidally induced activity in a brown dwarf-M dwarf pair: a Chandra study of the NLTT 41135/41136 system by Ilić, Nikoleta, Poppenhaeger, Katja, Dsouza, Desmond, Wolk, Scott J, Agüeros, Marcel A, Stelzer, Beate

“…ABSTRACT The magnetic activity of low-mass stars changes as they age. The primary process decreasing the stellar activity level is the angular momentum loss…”
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Giant white-light flares on fully convective stars occur at high latitudes by Ilin, Ekaterina, Poppenhaeger, Katja, Schmidt, Sarah J, Järvinen, Silva P, Newton, Elisabeth R, Alvarado-Gómez, Julián D, Pineda, J Sebastian, Davenport, James R A, Oshagh, Mahmoudreza, Ilyin, Ilya

“…ABSTRACT White-light flares are magnetically driven localized brightenings on the surfaces of stars. Their temporal, spectral, and statistical properties…”
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Simulated Coronal Mass Ejections on a Young Solar-type Star and the Associated Instantaneous Angular Momentum Loss by Xu, Yu, Alvarado-Gómez, Julián D., Tian, Hui, Poppenhäger, Katja, Guerrero, Gustavo, Liu, Xianyu

“…Abstract Coronal mass ejections (CMEs) on stars can change the stars’ magnetic field configurations and mass-loss rates during the eruption and propagation and…”
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The potassium absorption on HD189733b and HD209458b by Keles, Engin, Mallonn, Matthias, von Essen, Carolina, Carroll, Thorsten A, Alexoudi, Xanthippi, Pino, Lorenzo, Ilyin, Ilya, Poppenhäger, Katja, Kitzmann, Daniel, Nascimbeni, Valerio, Turner, Jake D, Strassmeier, Klaus G

“…ABSTRACT In this work, we investigate the potassium excess absorption around 7699 Å of the exoplanets HD189733b and HD209458b. For this purpose, we used…”
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The PEPSI exoplanet transit survey (PETS) I: investigating the presence of a silicate atmosphere on the super-earth 55 Cnc e by Keles, Engin, Mallonn, Matthias, Kitzmann, Daniel, Poppenhaeger, Katja, Hoeijmakers, H Jens, Ilyin, Ilya, Alexoudi, Xanthippi, Carroll, Thorsten A, Alvarado-Gomez, Julian, Ketzer, Laura, Bonomo, Aldo S, Borsa, Francesco, Gaudi, B Scott, Henning, Thomas, Malavolta, Luca, Molaverdikhani, Karan, Nascimbeni, Valerio, Patience, Jennifer, Pino, Lorenzo, Scandariato, Gaetano, Schlawin, Everett, Shkolnik, Evgenya, Sicilia, Daniela, Sozzetti, Alessandro, Foster, Mary G, Veillet, Christian, Wang, Ji, Yan, Fei, Strassmeier, Klaus G

“…ABSTRACT The study of exoplanets and especially their atmospheres can reveal key insights on their evolution by identifying specific atmospheric species. For…”
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The PEPSI Exoplanet Transit Survey (PETS). II. A Deep Search for Thermal Inversion Agents in KELT-20 b/MASCARA-2 b with Emission and Transmission Spectroscopy Based on data acquired with the Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) using the Large Binocular Telescope (LBT) in Arizona by Johnson, Marshall C., Wang, Ji, Asnodkar, Anusha Pai, Bonomo, Aldo S., Gaudi, B. Scott, Henning, Thomas, Ilyin, Ilya, Keles, Engin, Malavolta, Luca, Mallonn, Matthias, Molaverdikhani, Karan, Nascimbeni, Valerio, Patience, Jennifer, Poppenhaeger, Katja, Scandariato, Gaetano, Schlawin, Everett, Shkolnik, Evgenya, Sicilia, Daniela, Sozzetti, Alessandro, Strassmeier, Klaus G., Veillet, Christian, Yan, Fei

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The PEPSI Exoplanet Transit Survey (PETS) – IV. Assessing the atmospheric chemistry of KELT-20b by Petz, Sydney, Johnson, Marshall C, Asnodkar, Anusha Pai, Wang, Ji, Gaudi, B Scott, Henning, Thomas, Keles, Engin, Molaverdikhani, Karan, Poppenhaeger, Katja, Scandariato, Gaetano, Shkolnik, Evgenya K, Sicilia, Daniela, Strassmeier, Klaus G, Yan, Fei

“…ABSTRACT Most ultra-hot Jupiters (UHJs) show evidence of temperature inversions, in which temperature increases with altitude over a range of pressures…”
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