Search Results - "Theissen, Christopher A."

Early Time Spectropolarimetry of the Aspherical Type II Supernova SN 2023ixf by Vasylyev, Sergiy S., Yang, Yi, Filippenko, Alexei V., Patra, Kishore C., Brink, Thomas G., Wang, Lifan, Chornock, Ryan, Margutti, Raffaella, Gates, Elinor L., Burgasser, Adam J., Karpoor, Preethi R., LeBaron, Natalie, Softich, Emma, Theissen, Christopher A., Wiston, Eli, Zheng, WeiKang

“…Abstract We present six epochs of optical spectropolarimetry of the Type II supernova (SN) 2023ixf ranging from ∼2 to 15 days after the explosion. Polarimetry…”
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Discovery of the Exceptionally Short Period Ultracool Dwarf Binary LP 413-53AB by Hsu, Chih-Chun, Burgasser, Adam J., Theissen, Christopher A.

“…Abstract We report the detection of large-amplitude, rapid radial velocity (RV) variations and line-splitting in high-resolution Keck/NIRSPEC spectra of the M9…”
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Assessing the C/O Ratio Formation Diagnostic: A Potential Trend with Companion Mass by Hoch, Kielan K. W., Konopacky, Quinn M., Theissen, Christopher A., Ruffio, Jean-Baptiste, Barman, Travis S., Rickman, Emily L., Perrin, Marshall D., Macintosh, Bruce, Marois, Christian

“…Abstract The carbon-to-oxygen (C/O) ratio in an exoplanet atmosphere has been suggested as a potential diagnostic of planet formation. Now that a number of…”
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The 3D Kinematics of the Orion Nebula Cluster: NIRSPEC-AO Radial Velocities of the Core Population by Theissen, Christopher A., Konopacky, Quinn M., Lu, Jessica R., Kim, Dongwon, Zhang, Stella Y., Hsu, Chih-Chun, Chu, Laurie, Wei, Lingfeng

“…Abstract The kinematics and dynamics of stellar and substellar populations within young, still-forming clusters provide valuable information for constraining…”
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The 3D Kinematics of the Orion Nebula Cluster. II. Mass-dependent Kinematics of the Inner Cluster by Wei, Lingfeng, Theissen, Christopher A., Konopacky, Quinn M., Lu, Jessica R., Hsu, Chih-Chun, Kim, Dongwon

“…Abstract We present the kinematic analysis of 246 stars within 4 ′ from the center of Orion Nebula Cluster (ONC), the closest massive star cluster with active…”
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Astrometric Accelerations as Dynamical Beacons: A Giant Planet Imaged inside the Debris Disk of the Young Star AF Lep by Franson, Kyle, Bowler, Brendan P., Zhou, Yifan, Pearce, Tim D., Bardalez Gagliuffi, Daniella C., Biddle, Lauren I., Brandt, Timothy D., Crepp, Justin R., Dupuy, Trent J., Faherty, Jacqueline, Jensen-Clem, Rebecca, Morgan, Marvin, Sanghi, Aniket, Theissen, Christopher A., Tran, Quang H., Wolf, Trevor N.

“…Abstract We present the direct-imaging discovery of a giant planet orbiting the young star AF Lep, a 1.2 M ⊙ member of the 24 ± 3 Myr β Pic moving group. AF…”
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The Brown Dwarf Kinematics Project (BDKP). VI. Ultracool Dwarf Radial and Rotational Velocities from SDSS/APOGEE High-resolution Spectroscopy by Hsu, Chih-Chun, Burgasser, Adam J., Theissen, Christopher A., Birky, Jessica L., Aganze, Christian, Gerasimov, Roman, Schmidt, Sarah J., Blake, Cullen H., Covey, Kevin R., Moreno-Hilario, Elizabeth, Gelino, Christopher R., Serna, Javier, Brownstein, Joel R., Cunha, Katia

“…Abstract We present precise measurements of radial (RV) and projected rotational ( v sin i ) velocities of a sample of 258 M6 to L2 dwarfs with multiepoch,…”
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JWST-TST High Contrast: Spectroscopic Characterization of the Benchmark Brown Dwarf HD 19467 B with the NIRSpec Integral Field Spectrograph by Hoch, Kielan K. W., Theissen, Christopher A., Barman, Travis S., Perrin, Marshall D., Ruffio, Jean-Baptiste, Rickman, Emily, Konopacky, Quinn M., Manjavacas, Elena, Balmer, William O., Pueyo, Laurent, Kammerer, Jens, van der Marel, Roeland P., Lewis, Nikole K., Girard, Julien H., Seager, Sara, Clampin, Mark, Mountain, C. Matt

“…Abstract We present the atmospheric characterization of the substellar companion HD 19467 B as part of the pioneering James Webb Space Telescope Guaranteed…”
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Discovery of a Hypervelocity L Subdwarf at the Star/Brown Dwarf Mass Limit by Burgasser, Adam J., Gerasimov, Roman, Kremer, Kyle, Brooks, Hunter, Alvarado, Efrain, Schneider, Adam C., Meisner, Aaron M., Theissen, Christopher A., Softich, Emma, Karpoor, Preethi, Bickle, Thomas P., Kabatnik, Martin, Rothermich, Austin, Caselden, Dan, Kirkpatrick, J. Davy, Faherty, Jacqueline K., Casewell, Sarah L., Kuchner, Marc J.

“…Abstract We report the discovery of a high-velocity, very low-mass star or brown dwarf whose kinematics suggest it is unbound to the Milky Way. CWISE…”
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Parallaxes of Cool Objects with WISE: Filling in for Gaia by Theissen, Christopher A.

“…This paper uses the multi-epoch astrometry from the Wide-field Infrared Survey Explorer (WISE) to demonstrate a method to measure proper motions and…”
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WARM DUST AROUND COOL STARS: FIELD M DWARFS WITH WISE 12 OR 22 μm EXCESS EMISSION by Theissen, Christopher A, West, Andrew A

“…Using the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) spectroscopic catalog, we searched the WISE AllWISE catalog to investigate the occurrence of warm…”
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Moderate-resolution K-band Spectroscopy of the Substellar Companion VHS 1256 b by Hoch, Kielan K. W., Konopacky, Quinn M., Barman, Travis S., Theissen, Christopher A., Brock, Laci, Perrin, Marshall D., Ruffio, Jean-Baptiste, Macintosh, Bruce, Marois, Christian

“…Abstract We present moderate-resolution ( R ∼ 4000) K -band spectra of the planetary-mass companion VHS 1256 b. The data were taken with the OSIRIS integral…”
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Beyond the Local Volume. I. Surface Densities of Ultracool Dwarfs in Deep HST/WFC3 Parallel Fields by Aganze, Christian, Burgasser, Adam J., Malkan, Mathew, Theissen, Christopher A., Tejada Arevalo, Roberto A., Hsu, Chih-Chun, Bardalez Gagliuffi, Daniella C., Ryan, Russell E., Holwerda, Benne

“…Abstract Ultracool dwarf stars and brown dwarfs provide a unique probe of large-scale Galactic structure and evolution; however, until recently spectroscopic…”
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Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades by Franson, Kyle, Bowler, Brendan P., Bonavita, Mariangela, Brandt, Timothy D., Chen, Minghan, Samland, Matthias, Zhang, Zhoujian, Lueber, Anna, Heng, Kevin, Kitzmann, Daniel, Wolf, Trevor, Jones, Brandon A., Tran, Quang H., Bardalez Gagliuffi, Daniella C., Biller, Beth, Chilcote, Jeffrey, Crepp, Justin R., Dupuy, Trent J., Faherty, Jacqueline, Fontanive, Clémence, Groff, Tyler D., Gratton, Raffaele, Guyon, Olivier, Jensen-Clem, Rebecca, Jovanovic, Nemanja, Kasdin, N. Jeremy, Lozi, Julien, Magnier, Eugene A., Mužić, Koraljka, Sanghi, Aniket, Theissen, Christopher A.

“…Abstract Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and…”
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Beyond the Local Volume. II. Population Scaleheights and Ages of Ultracool Dwarfs in Deep HST/WFC3 Parallel Fields by Aganze, Christian, Burgasser, Adam J., Malkan, Mathew, Theissen, Christopher A., Tejada Arevalo, Roberto A., Hsu, Chih-Chun, Bardalez Gagliuffi, Daniella C., Ryan, Russell E., Holwerda, Benne

“…Abstract Ultracool dwarfs (UCDs) represent a significant proportion of stars in the Milky Way, and deep samples of these sources have the potential to…”
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RUNAWAY M DWARF CANDIDATES FROM THE SLOAN DIGITAL SKY SURVEY by Favia, Andrej, West, Andrew A., Theissen, Christopher A.

“…ABSTRACT We present a sample of 20 runaway M dwarf candidates (RdMs) within 1 kpc of the Sun whose Galactocentric (GC) velocities exceed 400 km s−1. The…”
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A Wide Planetary Mass Companion Discovered through the Citizen Science Project Backyard Worlds: Planet 9 by Faherty, Jacqueline K., Gagné, Jonathan, Popinchalk, Mark, Vos, Johanna M., Burgasser, Adam J., Schümann, Jörg, Schneider, Adam C., Kirkpatrick, J. Davy, Meisner, Aaron M., Kuchner, Marc J., Bardalez Gagliuffi, Daniella C., Marocco, Federico, Caselden, Dan, Gonzales, Eileen C., Rothermich, Austin, Casewell, Sarah L., Debes, John H., Aganze, Christian, Ayala, Andrew, Hsu, Chih-Chun, Cooper, William J., Smart, R. L., Gerasimov, Roman, Theissen, Christopher A.

“…Abstract Through the Backyard Worlds: Planet 9 citizen science project we discovered a late-type L dwarf co-moving with the young K0 star BD+60 1417 at a…”
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JWST-TST High Contrast: Achieving Direct Spectroscopy of Faint Substellar Companions Next to Bright Stars with the NIRSpec Integral Field Unit by Ruffio, Jean-Baptiste, Perrin, Marshall D., Hoch, Kielan K. W., Kammerer, Jens, Konopacky, Quinn M., Pueyo, Laurent, Madurowicz, Alex, Rickman, Emily, Theissen, Christopher A., Agrawal, Shubh, Greenbaum, Alexandra Z., Miles, Brittany E., Barman, Travis S., Balmer, William O., Llop-Sayson, Jorge, Girard, Julien H., Rebollido, Isabel, Soummer, Rémi, Allen, Natalie H., Anderson, Jay, Beichman, Charles A., Bellini, Andrea, Bryden, Geoffrey, Espinoza, Néstor, Glidden, Ana, Huang, Jingcheng, Lewis, Nikole K., Libralato, Mattia, Louie, Dana R., Sohn, Sangmo Tony, Seager, Sara, van der Marel, Roeland P., Wakeford, Hannah R., Watkins, Laura L., Ygouf, Marie, Mountain, C. Matt

“…Abstract The JWST NIRSpec integral field unit (IFU) presents a unique opportunity to observe directly imaged exoplanets from 3 to 5 μ m at moderate spectral…”
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89 New Ultracool Dwarf Comoving Companions Identified with the Backyard Worlds: Planet 9 Citizen Science Project by Rothermich, Austin, Faherty, Jacqueline K., Bardalez-Gagliuffi, Daniella, Schneider, Adam C., Kirkpatrick, J. Davy, Meisner, Aaron M., Burgasser, Adam J., Kuchner, Marc, Allers, Katelyn, Gagné, Jonathan, Caselden, Dan, Calamari, Emily, Popinchalk, Mark, Suárez, Genaro, Gerasimov, Roman, Aganze, Christian, Softich, Emma, Hsu, Chin-Chun, Karpoor, Preethi, Theissen, Christopher A., Rees, Jon, Cecilio-Flores-Elie, Rosario, Cushing, Michael C., Marocco, Federico, Casewell, Sarah, Bickle, Thomas P., Hamlet, Les, Allen, Michaela B., Beaulieu, Paul, Colin, Guillaume, Gantier, Jean Marc, Gramaize, Leopold, Jalowiczor, Peter, Kabatnik, Martin, Kiwy, Frank, Martin, David W., Pendrill, Billy, Pumphrey, Ben, Sainio, Arttu, Schumann, Jorg, Stevnbak, Nikolaj, Sun, Guoyou, Tanner, Christopher, Thakur, Vinod, Thevenot, Melina, Wedracki, Zbigniew

“…Abstract We report the identification of 89 new systems containing ultracool dwarf companions to main-sequence stars and white dwarfs, using the citizen…”
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JWST/NIRCam 4–5 μm Imaging of the Giant Planet AF Lep b by Franson, Kyle, Balmer, William O., Bowler, Brendan P., Pueyo, Laurent, Zhou, Yifan, Rickman, Emily, Zhang, Zhoujian, Mukherjee, Sagnick, Pearce, Tim D., Bardalez Gagliuffi, Daniella C., Biddle, Lauren I., Brandt, Timothy D., Bowens-Rubin, Rachel, Crepp, Justin R., Davidson, James W., Faherty, Jacqueline, Ginski, Christian, Horch, Elliott P., Morgan, Marvin, Morley, Caroline V., Perrin, Marshall D., Sanghi, Aniket, Salama, Maïssa, Theissen, Christopher A., Tran, Quang H., Wolf, Trevor N.

“…Abstract With a dynamical mass of 3 M Jup , the recently discovered giant planet AF Lep b is the lowest-mass imaged planet with a direct mass measurement. Its…”
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