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16 results on '"Grady, Carol A"'

1. Wavelength-dependent Extinction and Grain Sizes in “Dippers”

Author

Sitko, Michael L., primary, Russell, Ray W., additional, Long, Zachary C., additional, Assani, Korash, additional, Pikhartova, Monika, additional, Bayyari, Ammar, additional, Grady, Carol A., additional, Lisse, Carey M., additional, Marengo, Massimo, additional, Wisniewski, John P., additional, and Danchi, William C., additional

Published
2023
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2. Near-Infrared Imaging Polarimetry of Inner Region of GG Tau A Disk

Author

Yang, Yi, Hashimoto, Jun, Hayashi, Saeko S, Tamura, Motohide, Mayama, Satoshi, Rafikov, Roman, Akiyama, Eiji, Carson, Joseph C, Janson, Markus, Kwon, Jungmi, de Leon, Jerome, Oh, Daehyeon, Takami, Michihiro, Tang, Ya-wen, Kudo, Tomoyuki, Kusakabe, Nobuhiko, Abe, Lyu, Brandner, Wolfgang, Brandt, Timothy D, Egner, Sebastian, Feldt, Markus, Goto, Miwa, Grady, Carol A, Guyon, Olivier, Hayano, Yutaka, Hayashi, Masahiko, Henning, Thomas, Hodapp, Klaus W, Ishii, Miki, Iye, Masanori, Kandori, Ryo, Knapp, Gillian R, Kuzuhara, Masayuki, Matsuo, Taro, Mcelwain, Michael W, Miyama, Shoken, Morino, Jun-Ichi, Moro-martin, Amaya, Nishimura, Tetsuo, Pyo, Tae-Soo, Serabyn, Eugene, Suenaga, Takuya, Suto, Hiroshi, Suzuki, Ryuji, Takahashi, Yasuhiro H, Takato, Naruhisa, Terada, Hiroshi, Thalmann, Christian, Turner, Edwin L, Watanabe, Makoto, Wisniewski, John, Yamada, Toru, Takami, Hideki, and Usuda, Tomonori

Subjects
Astrophysics
Abstract

By performing non-masked polarization imaging with Subaru HiCIAO, polarized scattered light from the inner region of the disk around the GGTau A system was successfully detected in the H band, with a spatial resolution of approximately0 07, revealing the complicated inner disk structures around this young binary. This paper reports the observation of an arc-like structure to the north of GG Tau Ab, and part of a circumstellar structure that is noticeable around GG Tau Aa, extending to a distance of approximately 28 au from the primary star. The speckle noise around GG Tau Ab constrains its disk radius to 13 au. Based on the size of the circumbinary ring and the circumstellar disk around GG Tau Aa, these mimajor axis of the binary's orbit is likely to be 62 au. A comparison of the present observations with previous Atacama Large Millimeter Array and near-infrared H2 emission observations suggests that the north arc could be part of a large streamer flowing from the circumbinary ring to sustain the circumstellar disks. According to the previous studies,the circumstellar disk around GG Tau Aa has enough mass and can sustain itself for a duration sufficient for planet formation; thus, our study indicates that planets can form within close (separation 100 au) young binary systems.

Published
2016
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3. Spiral Structure and Differential Dust Size Distribution in the LkH(alpha) 330 Disk

Author

Akiyama, Eiji, Hashimoto, Jun, Liu, Hauyu Baobabu, Li, Jennifer I-hsiu, Bonnefoy, Michael, Dong, Ruobing, Hasegawa, Yasuhiro, Henning, Thomas, Sitko, Michael L, Janson, Markus, Feldt, Markus, Wisniewski, John, Kudo, Tomoyuki, Kusakabe, Nobuhiko, Tsukagoshi, Takashi, Momose, Munetake, Muto, Takayuki, Taki, Tetsuo, Kuzuhara, Masayuki, Satoshi, Mayama, Takami, Michihiro, Ohashi, Nagayoshi, Grady, Carol A, Kwon, Jungmi, Thalmann,Christian, Abe, Lyo, Brandner, Wolfgang, Brandt, Timothy D, Carson, Joseph C, Egner, Sebastian, Goto, Miwa, Guyon, Olivier, Hayano, Yutaka, Hayashi, Masahiko, Hayashi, Saeko S, Hodapp, Klaus W, Ishii, Miki, Iye, Masanori, Knapp, Gillian R, Kandori, Ryo, Matsuo, Taro, McElwain, Michael W, Miyama, Shoken, Morino, Jun-Ichi, Moro-Martin, Amaya, Nishimura,Tetsuo, Pyo, Tae-Soo, Serabyn, Eugene, Suenaga,Takuya, Suto, Hiroshi, Suzuki, Ryuji, Takahashi,Yasuhiro H, Takato, Naruhisa, Terada, Hiroshi, Tomono, Daigo, Turner, Edwin L, Watanabe, Makoto, Yamada, Toru, Takami, Hideki, Usuda, Tomonori, and Tamura, Motohide

Subjects
Astrophysics
Abstract

Dust trapping accelerates the coagulation of dust particles, and, thus, it represents an initial step toward the formation of planetesimals. We report H-band (1.6 microns) linear polarimetric observations and 0.87 mm interferometric continuum observations toward a transitional disk around LkH(alpha) 330. As a result, a pair of spiral arms were detected in the H-band emission, and an asymmetric (potentially arm-like) structure was detected in the 0.87 mm continuum emission. We discuss the origin of the spiral arm and the asymmetric structure and suggest that a massive unseen planet is the most plausible explanation. The possibility of dust trapping and grain growth causing the asymmetric structure was also investigated through the opacity index (beta) by plotting the observed spectral energy distribution slope between 0.87 mm from our Submillimeter Array observation and1.3 mm from literature. The results imply that grains are indistinguishable from interstellar medium-like dust in the east side (beta = 2.0 +/- 0.5) but are much smaller in the west side beta = 0.7+0.5 -0.4, indicating differential dust size distribution between the two sides of the disk. Combining the results of near-infrared and submillimeter observations, we conjecture that the spiral arms exist at the upper surface and an asymmetric structure resides in the disk interior. Future observations at centimeter wavelengths and differential polarization imaging in other bands (Y-K) with extreme AO imagers are required to understand how large dust grains form and to further explore the dust distribution in the disk.

Published
2016
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4. Deep HST/STIS Visible-Light Imaging of Debris Systems Around Solar Analog Hosts

Author

Schneider, Glenn, Grady, Carol A, Stark, Christopher C, Gaspar, Andras, Carson, Joseph, Debes, John H, Henning, Thomas, Hines, Dean C, Jang-Condell, Hannah, and Kuchner, Marc J

Subjects
Astrophysics
Abstract

We present new Hubble Space Telescope observations of three a priori known starlight-scattering circumstellar debris systems (CDSs) viewed at intermediate inclinations around nearby close-solar analog stars: HD 207129, HD202628, and HD 202917. Each of these CDSs possesses ring-like components that are more massive analogs of our solar systems Edgeworth Kuiper Belt. These systems were chosen for follow-up observations to provide imaging with higher fidelity and better sensitivity for the sparse sample of solar-analog CDSs that range over two decades in systemic ages, with HD 202628 and HD 207129 (both approx. 2.3 Gyr) currently the oldest CDSs imaged in visible or near-IR light. These deep (10-14 ks) observations, made with six-roll point-spread-function template visible-light coronagraphy using the Space Telescope Imaging Spectrograph, were designed to better reveal their angularly large debris rings of diffuse low surface brightness, and for all targets probe their exo-ring environments for starlight-scattering materials that present observational challenges for current ground-based facilities and instruments. Contemporaneously also observing with a narrower occulter position, these observations additionally probe the CDS endo-ring environments that are seen to be relatively devoid of scatterers. We discuss the morphological, geometrical, and photometric properties of these CDSs also in the context of other CDSs hosted by FGK stars that we have previously imaged as a homogeneously observed ensemble. From this combined sample we report a general decay in quiescent-disk F disk /F star optical brightness approx. t( exp.-0.8), similar to what is seen at thermal IR wavelengths, and CDSs with a significant diversity in scattering phase asymmetries, and spatial distributions of their starlight-scattering grains.

Published
2016
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5. A Radiatively Driven Wind from the η Tel Debris Disk

Author

Youngblood, Allison, primary, Roberge, Aki, additional, MacGregor, Meredith A., additional, Brandeker, Alexis, additional, Weinberger, Alycia J., additional, Pérez, Sebastián, additional, Grady, Carol, additional, and Welsh, Barry, additional

Published
2021
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6. Near-IR Polarized Scattered Light Imagery of the DoAr 28 Transitional Disk

Author

Rich, Evan A, Wisiniewski, John P, Mayama, Satoshi, Brandt, Timothy D, Hashimoto, Jun, Kudo, Tomoyuki, Kusakabe, Nobuhiko, Espaillat, Catherine, Serabyn, Eugene, Grady, Carol A, and McElwain, Michael W

Subjects
Astrophysics
Abstract

We present the first spatially resolved polarized scattered light H-band detection of the DoAr 28 transitional disk. Our two epochs of imagery detect the scattered light disk from our effective inner working angle of 0 double prime.10 (13 AU) out to 0double prime.50 (65 AU). This inner working angle is interior to the location of the system's gap inferred by previous studies using spectral energy distribution modeling (15 AU). We detected a candidate point source companion 1 double prime.08 northwest of the system; however, our second epoch of imagery strongly suggests that this object is a background star. We constructed a grid of Monte Carlo Radiative Transfer models of the system, and our best fit models utilize a modestly inclined (50 degrees), 0.01 solar mass disk that has a partially depleted inner gap from the dust sublimation radius out to approximately 8 AU. Subtracting this best fit, axi-symmetric model from our polarized intensity data reveals evidence for two small asymmetries in the disk, which could be attributable to a variety of mechanisms.

Published
2015
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7. Subaru Near-infrared Imaging Polarimetry of Misaligned Disks around the SR 24 Hierarchical Triple System*

Author

Mayama, Satoshi, primary, Pérez, Sebastián, additional, Kusakabe, Nobuhiko, additional, Muto, Takayuki, additional, Tsukagoshi, Takashi, additional, Sitko, Michael L., additional, Takami, Michihiro, additional, Hashimoto, Jun, additional, Dong, Ruobing, additional, Kwon, Jungmi, additional, Hayashi, Saeko S., additional, Kudo, Tomoyuki, additional, Kuzuhara, Masayuki, additional, Follette, Katherine, additional, Fukagawa, Misato, additional, Momose, Munetake, additional, Oh, Daehyeon, additional, de Leon, Jerome, additional, Akiyama, Eiji, additional, Wisniewski, John P., additional, Yang, Yi, additional, Abe, Lyu, additional, Brandner, Wolfgang, additional, Brandt, Timothy D., additional, Bonnefoy, Michael, additional, Carson, Joseph C., additional, Chilcote, Jeffrey, additional, Currie, Thayne, additional, Feldt, Markus, additional, Goto, Miwa, additional, Grady, Carol A., additional, Groff, Tyler, additional, Guyon, Olivier, additional, Hayano, Yutaka, additional, Hayashi, Masahiko, additional, Henning, Thomas, additional, Hodapp, Klaus W., additional, Ishii, Miki, additional, Iye, Masanori, additional, Janson, Markus, additional, Jovanovic, Nemanja, additional, Kandori, Ryo, additional, Kasdin, Jeremy, additional, Knapp, Gillian R., additional, Lozi, Julien, additional, Martinache, Frantz, additional, Matsuo, Taro, additional, McElwain, Michael W., additional, Miyama, Shoken, additional, Morino, Jun-Ichi, additional, Moro-Martin, Amaya, additional, Nakagawa, Takao, additional, Nishimura, Tetsuo, additional, Pyo, Tae-Soo, additional, Rich, Evan A., additional, Serabyn, Eugene, additional, Suto, Hiroshi, additional, Suzuki, Ryuji, additional, Takato, Naruhisa, additional, Terada, Hiroshi, additional, Thalmann, Christian, additional, Tomono, Daigo, additional, Turner, Edwin L., additional, Watanabe, Makoto, additional, Yamada, Toru, additional, Takami, Hideki, additional, Usuda, Tomonori, additional, Uyama, Taichi, additional, and Tamura, Motohide, additional

Published
2019
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8. SCExAO/CHARIS Near-infrared Direct Imaging, Spectroscopy, and Forward-Modeling of κ And b: A Likely Young, Low-gravity Superjovian Companion

Author

Currie, Thayne, primary, Brandt, Timothy D., additional, Uyama, Taichi, additional, Nielsen, Eric L., additional, Blunt, Sarah, additional, Guyon, Olivier, additional, Tamura, Motohide, additional, Marois, Christian, additional, Mede, Kyle, additional, Kuzuhara, Masayuki, additional, Groff, Tyler D., additional, Jovanovic, Nemanja, additional, Kasdin, N. Jeremy, additional, Lozi, Julien, additional, Hodapp, Klaus, additional, Chilcote, Jeffrey, additional, Carson, Joseph, additional, Martinache, Frantz, additional, Goebel, Sean, additional, Grady, Carol, additional, McElwain, Michael, additional, Akiyama, Eiji, additional, Asensio-Torres, Ruben, additional, Hayashi, Masa, additional, Janson, Markus, additional, Knapp, Gillian R., additional, Kwon, Jungmi, additional, Nishikawa, Jun, additional, Oh, Daehyeon, additional, Schlieder, Joshua, additional, Serabyn, Eugene, additional, Sitko, Michael, additional, and Skaf, Nour, additional

Published
2018
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9. SCExAO/CHARIS Near-IR High-contrast Imaging and Integral Field Spectroscopy of the HIP 79977 Debris Disk

Author

Goebel, Sean, primary, Currie, Thayne, additional, Guyon, Olivier, additional, Brandt, Timothy D., additional, Groff, Tyler D., additional, Jovanovic, Nemanja, additional, Kasdin, N. Jeremy, additional, Lozi, Julien, additional, Hodapp, Klaus, additional, Martinache, Frantz, additional, Grady, Carol, additional, Hayashi, Masa, additional, Kwon, Jungmi, additional, McElwain, Michael W., additional, Yang, Yi, additional, and Tamura, Motohide, additional

Published
2018
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10. Subaru/HiCIAO HK s Imaging of LKHa 330: Multi-band Detection of the Gap and Spiral-like Structures

Author

Uyama, Taichi, primary, Hashimoto, Jun, additional, Muto, Takayuki, additional, Akiyama, Eiji, additional, Dong, Ruobing, additional, Leon, Jerome de, additional, Sakon, Itsuki, additional, Kudo, Tomoyuki, additional, Kusakabe, Nobuhiko, additional, Kuzuhara, Masayuki, additional, Bonnefoy, Mickael, additional, Abe, Lyu, additional, Brandner, Wolfgang, additional, Brandt, Timothy D., additional, Carson, Joseph C., additional, Currie, Thayne, additional, Egner, Sebastian, additional, Feldt, Markus, additional, Fung, Jeffrey, additional, Goto, Miwa, additional, Grady, Carol A., additional, Guyon, Olivier, additional, Hayano, Yutaka, additional, Hayashi, Masahiko, additional, Hayashi, Saeko S., additional, Henning, Thomas, additional, Hodapp, Klaus W., additional, Ishii, Miki, additional, Iye, Masanori, additional, Janson, Markus, additional, Kandori, Ryo, additional, Knapp, Gillian R., additional, Kwon, Jungmi, additional, Matsuo, Taro, additional, Mayama, Satoshi, additional, Mcelwain, Michael W., additional, Miyama, Shoken, additional, Morino, Jun-Ichi, additional, Moro-Martin, Amaya, additional, Nishimura, Tetsuo, additional, Pyo, Tae-Soo, additional, Serabyn, Eugene, additional, Sitko, Michael L., additional, Suenaga, Takuya, additional, Suto, Hiroshi, additional, Suzuki, Ryuji, additional, Takahashi, Yasuhiro H., additional, Takami, Michihiro, additional, Takato, Naruhisa, additional, Terada, Hiroshi, additional, Thalmann, Christian, additional, Turner, Edwin L., additional, Watanabe, Makoto, additional, Wisniewski, John, additional, Yamada, Toru, additional, Yang, Yi, additional, Takami, Hideki, additional, Usuda, Tomonori, additional, and Tamura, Motohide, additional

Published
2018
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12. The SEEDS High-Contrast Imaging Survey of Exoplanets Around Young Stellar Objects

Author

Uyama, Taichi, primary, Hashimoto, Jun, additional, Kuzuhara, Masayuki, additional, Mayama, Satoshi, additional, Akiyama, Eiji, additional, Currie, Thayne, additional, Livingston, John, additional, Kudo, Tomoyuki, additional, Kusakabe, Nobuhiko, additional, Abe, Lyu, additional, Brandner, Wolfgang, additional, Brandt, Timothy D., additional, Carson, Joseph C., additional, Egner, Sebastian, additional, Feldt, Markus, additional, Goto, Miwa, additional, Grady, Carol A., additional, Guyon, Olivier, additional, Hayano, Yutaka, additional, Hayashi, Masahiko, additional, Hayashi, Saeko S., additional, Henning, Thomas, additional, Hodapp, Klaus W., additional, Ishii, Miki, additional, Iye, Masanori, additional, Janson, Markus, additional, Kandori, Ryo, additional, Knapp, Gillian R., additional, Kwon, Jungmi, additional, Matsuo, Taro, additional, Mcelwain, Michael W., additional, Miyama, Shoken, additional, Morino, Jun-Ichi, additional, Moro-Martin, Amaya, additional, Nishimura, Tetsuo, additional, Pyo, Tae-Soo, additional, Serabyn, Eugene, additional, Suenaga, Takuya, additional, Suto, Hiroshi, additional, Suzuki, Ryuji, additional, Takahashi, Yasuhiro H., additional, Takami, Michihiro, additional, Takato, Naruhisa, additional, Terada, Hiroshi, additional, Thalmann, Christian, additional, Turner, Edwin L., additional, Watanabe, Makoto, additional, Wisniewski, John, additional, Yamada, Toru, additional, Takami, Hideki, additional, Usuda, Tomonori, additional, and Tamura, Motohide, additional

Published
2017
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13. SPIRAL STRUCTURE AND DIFFERENTIAL DUST SIZE DISTRIBUTION IN THE LkHα330 DISK

Author

Akiyama, Eiji, primary, Hashimoto, Jun, additional, Liu, Hauyu baobabu, additional, Li, Jennifer i-hsiu, additional, Bonnefoy, Michael, additional, Dong, Ruobing, additional, Hasegawa, Yasuhiro, additional, Henning, Thomas, additional, Sitko, Michael L., additional, Janson, Markus, additional, Feldt, Markus, additional, Wisniewski, John, additional, Kudo, Tomoyuki, additional, Kusakabe, Nobuhiko, additional, Tsukagoshi, Takashi, additional, Momose, Munetake, additional, Muto, Takayuki, additional, Taki, Tetsuo, additional, Kuzuhara, Masayuki, additional, Satoshi, Mayama, additional, Takami, Michihiro, additional, Ohashi, Nagayoshi, additional, Grady, Carol A., additional, Kwon, Jungmi, additional, Thalmann, Christian, additional, Abe, Lyu, additional, Brandner, Wolfgang, additional, Brandt, Timothy D., additional, Carson, Joseph C., additional, Egner, Sebastian, additional, Goto, Miwa, additional, Guyon, Olivier, additional, Hayano, Yutaka, additional, Hayashi, Masahiko, additional, Hayashi, Saeko S., additional, Hodapp, Klaus W., additional, Ishii, Miki, additional, Iye, Masanori, additional, Knapp, Gillian R., additional, Kandori, Ryo, additional, Matsuo, Taro, additional, Mcelwain, Michael W., additional, Miyama, Shoken, additional, Morino, Jun-Ichi, additional, Moro-Martin, Amaya, additional, Nishimura, Tetsuo, additional, Pyo, Tae-Soo, additional, Serabyn, Eugene, additional, Suenaga, Takuya, additional, Suto, Hiroshi, additional, Suzuki, Ryuji, additional, Takahashi, Yasuhiro H., additional, Takato, Naruhisa, additional, Terada, Hiroshi, additional, Tomono, Daigo, additional, Turner, Edwin L., additional, Watanabe, Makoto, additional, Yamada, Toru, additional, Takami, Hideki, additional, Usuda, Tomonori, additional, and Tamura, Motohide, additional

Published
2016
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14. DEEPHST/STIS VISIBLE-LIGHT IMAGING OF DEBRIS SYSTEMS AROUND SOLAR ANALOG HOSTS

Author

Schneider, Glenn, primary, Grady, Carol A., additional, Stark, Christopher C., additional, Gaspar, Andras, additional, Carson, Joseph, additional, Debes, John H., additional, Henning, Thomas, additional, Hines, Dean C., additional, Jang-Condell, Hannah, additional, Kuchner, Marc J., additional, Perrin, Marshall, additional, Rodigas, Timothy J., additional, Tamura, Motohide, additional, and Wisniewski, John P., additional

Published
2016
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15. PROBING FOR EXOPLANETS HIDING IN DUSTY DEBRIS DISKS: DISK IMAGING, CHARACTERIZATION, AND EXPLORATION WITHHST/STIS MULTI-ROLL CORONAGRAPHY

Author

Schneider, Glenn, primary, Grady, Carol A., additional, Hines, Dean C., additional, Stark, Christopher C., additional, Debes, John H., additional, Carson, Joe, additional, Kuchner, Marc J., additional, Perrin, Marshall D., additional, Weinberger, Alycia J., additional, Wisniewski, John P., additional, Silverstone, Murray D., additional, Jang-Condell, Hannah, additional, Henning, Thomas, additional, Woodgate, Bruce E., additional, Serabyn, Eugene, additional, Moro-Martin, Amaya, additional, Tamura, Motohide, additional, Hinz, Phillip M., additional, and Rodigas, Timothy J., additional

Published
2014
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