Search Results - "Fischer, William J."

Constraining the Rate of Protostellar Accretion Outbursts in the Orion Molecular Clouds by Fischer, William J., Safron, Emily, Megeath, S. Thomas

“…Outbursts due to dramatic increases in the mass accretion rate are the most extreme type of variability in young stellar objects. We searched for outbursts…”
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Gaps and Rings in an ALMA Survey of Disks in the Taurus Star-forming Region by Long, Feng, Pinilla, Paola, Herczeg, Gregory J., Harsono, Daniel, Dipierro, Giovanni, Pascucci, Ilaria, Hendler, Nathan, Tazzari, Marco, Ragusa, Enrico, Salyk, Colette, Edwards, Suzan, Lodato, Giuseppe, van de Plas, Gerrit, Johnstone, Doug, Liu, Yao, Boehler, Yann, Cabrit, Sylvie, Manara, Carlo F., Menard, Francois, Mulders, Gijs D., Nisini, Brunella, Fischer, William J., Rigliaco, Elisabetta, Banzatti, Andrea, Avenhaus, Henning, Gully-Santiago, Michael

“…Rings are the most frequently revealed substructure in Atacama Large Millimeter/submillimeter Array (ALMA) dust observations of protoplanetary disks, but their…”
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Compact Disks in a High-resolution ALMA Survey of Dust Structures in the Taurus Molecular Cloud by Long, Feng, Herczeg, Gregory J., Harsono, Daniel, Pinilla, Paola, Tazzari, Marco, Manara, Carlo F., Pascucci, Ilaria, Cabrit, Sylvie, Nisini, Brunella, Johnstone, Doug, Edwards, Suzan, Salyk, Colette, Menard, Francois, Lodato, Giuseppe, Boehler, Yann, Mace, Gregory N., Liu, Yao, Mulders, Gijs D., Hendler, Nathanial, Ragusa, Enrico, Fischer, William J., Banzatti, Andrea, Rigliaco, Elisabetta, van de Plas, Gerrit, Dipierro, Giovanni, Gully-Santiago, Michael, Lopez-Valdivia, Ricardo

“…We present a high-resolution (∼0 12, ∼16 au, mean sensitivity of 50 Jy beam−1 at 225 GHz) snapshot survey of 32 protoplanetary disks around young stars with…”
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300: An ACA 870 μm Continuum Survey of Orion Protostars and Their Evolution by Federman, Samuel, Megeath, S. Thomas, Tobin, John J., Sheehan, Patrick D., Pokhrel, Riwaj, Habel, Nolan, Stutz, Amelia M., Fischer, William J., Hartmann, Lee, Stanke, Thomas, Narang, Mayank, Osorio, Mayra, Atnagulov, Prabhani, Rahatgaonkar, Rohan

“…Abstract We present an 870 μ m continuum survey of 300 protostars from the Herschel Orion Protostar Survey using the Atacama Compact Array (ACA). These data…”
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The Herschel Orion Protostar Survey: Luminosity and Envelope Evolution by Fischer, William J., Megeath, S. Thomas, Furlan, Elise, Ali, Babar, Stutz, Amelia M., Tobin, John J., Osorio, Mayra, Stanke, Thomas, Manoj, P., Poteet, Charles A., Booker, Joseph J., Hartmann, Lee, Wilson, Thomas L., Myers, Philip C., Watson, Dan M.

“…The Herschel Orion Protostar Survey obtained well-sampled 1.2-870 m spectral energy distributions (SEDs) of over 300 protostars in the Orion molecular clouds,…”
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Star-Gas Surface Density Correlations in 12 Nearby Molecular Clouds. I. Data Collection and Star-sampled Analysis by Pokhrel, Riwaj, Gutermuth, Robert A., Betti, Sarah K., Offner, Stella S. R., Myers, Philip C., Megeath, S. Thomas, Sokol, Alyssa D., Ali, Babar, Allen, Lori, Allen, Thomas S., Dunham, Michael M., Fischer, William J., Henning, Thomas, Heyer, Mark, Hora, Joseph L., Pipher, Judith L., Tobin, John J., Wolk, Scott J.

“…We explore the relation between the stellar mass surface density and the mass surface density of molecular hydrogen gas in 12 nearby molecular clouds that are…”
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Extension of HOPS out to 500 pc (eHOPS). I. Identification and Modeling of Protostars in the Aquila Molecular Clouds by Pokhrel, Riwaj, Megeath, S. Thomas, Gutermuth, Robert A., Furlan, Elise, Fischer, William J., Federman, Samuel, Tobin, John J., Stutz, Amelia M., Hartmann, Lee, Osorio, Mayra, Watson, Dan M., Stanke, Thomas, Manoj, P., Narang, Mayank, Atnagulov, Prabhani, Habel, Nolan, Zakri, Wafa

“…Abstract We present a Spitzer/Herschel focused survey of the Aquila molecular clouds ( d ∼ 436 pc) as part of the eHOPS (extension of the Herschel orion…”
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Demographics of Protoplanetary Disks: A Simulated Population of Edge-on Systems by Angelo, Isabel, Duchene, Gaspard, Stapelfeldt, Karl, Telkamp, Zoie, Ménard, François, Padgett, Deborah, Van der Plas, Gerrit, Villenave, Marion, Pinte, Christophe, Wolff, Schuyler, Fischer, William J., Perrin, Marshall D.

“…Abstract The structure of protoplanetary disks plays an essential role in planet formation. A disk that is highly inclined, or “edge-on,” is of particular…”
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Far-infrared Luminosity Bursts Trace Mass Accretion onto Protostars by Fischer, William J., Battersby, Cara, Johnstone, Doug, Lee, Rachel, Sewiło, Marta, Beuther, Henrik, Hasegawa, Yasuhiro, Ginsburg, Adam, Pontoppidan, Klaus

“…Abstract Evidence abounds that young stellar objects undergo luminous bursts of intense accretion that are short compared to the time it takes to form a star…”
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Lyα Scattering Models Trace Accretion and Outflow Kinematics in T Tauri Systems by Arulanantham, Nicole, Gronke, Max, Fiorellino, Eleonora, Gameiro, Jorge Filipe, Frasca, Antonio, Green, Joel, Chang, Seok-Jun, Claes, Rik A. B., Espaillat, Catherine C., France, Kevin, Herczeg, Gregory J., Manara, Carlo F., Venuti, Laura, Ábrahám, Péter, Alexander, Richard, Bouvier, Jerome, Campbell-White, Justyn, Eislöffel, Jochen, Fischer, William J., Kóspál, Ágnes, Vioque, Miguel

“…Abstract T Tauri stars produce broad Ly α emission lines that contribute ∼88% of the total UV flux incident on the inner circumstellar disks. Ly α photons are…”
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An HST Survey of Protostellar Outflow Cavities: Does Feedback Clear Envelopes? by Habel, Nolan M., Thomas Megeath, S., Jon Booker, Joseph, Fischer, William J., Kounkel, Marina, Poteet, Charles, Furlan, Elise, Stutz, Amelia, Manoj, P., Tobin, John J., Nagy, Zsofia, Pokhrel, Riwaj, Watson, Dan

“…Abstract We study protostellar envelope and outflow evolution using Hubble Space Telescope NICMOS or WFC3 images of 304 protostars in the Orion molecular…”
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Investigating the Impact of Metallicity on Star Formation in the Outer Galaxy. I. VLT/KMOS Survey of Young Stellar Objects in Canis Major by Itrich, Dominika, Karska, Agata, Sewiło, Marta, Kristensen, Lars E., Herczeg, Gregory J., Ramsay, Suzanne, Fischer, William J., Tabone, Benoît, Rocha, Will R. M., Koprowski, Maciej, Lê, Ngân, Deka-Szymankiewicz, Beata

“…The effects of metallicity on the evolution of protoplanetary disks may be studied in the outer Galaxy where the metallicity is lower than in the solar…”
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CHARACTERIZING THE YOUNGEST HERSCHEL-DETECTED PROTOSTARS. II. MOLECULAR OUTFLOWS FROM THE MILLIMETER AND THE FAR-INFRARED by Tobin, John J., Stutz, Amelia M., Manoj, P., Megeath, S. Thomas, Karska, Agata, Nagy, Zsofia, Wyrowski, Friedrich, Fischer, William J., Watson, Dan M., Stanke, Thomas

“…ABSTRACT We present Combined Array for Research in Millimeter-wave Astronomy (CARMA) CO ( ) observations and Herschel PACS spectroscopy, characterizing the…”
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A Multiwavelength, Multiepoch Monitoring Campaign of Accretion Variability in T Tauri Stars from the ODYSSEUS Survey. I. HST Far-UV and Near-UV Spectra by Wendeborn, John, Espaillat, Catherine C., Lopez, Sophia, Thanathibodee, Thanawuth, Robinson, Connor E., Pittman, Caeley V., Calvet, Nuria, Flors, Nicole, Walter, Fredrick M., Kóspál, Ágnes, Grankin, Konstantin N., Mendigutía, Ignacio, Günther, Hans Moritz, Eislöffel, Jochen, Guo, Zhen, France, Kevin, Fiorellino, Eleonora, Fischer, William J., Ábrahám, Péter, Herczeg, Gregory J.

“…Abstract The classical T Tauri star (CTTS) stage is a critical phase of the star and planet formation process. In an effort to better understand the mass…”
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EVOLUTION OF MASS OUTFLOW IN PROTOSTARS by Watson, Dan M., Calvet, Nuria P., Fischer, William J., Forrest, W. J., Manoj, P., Megeath, S. Thomas, Melnick, Gary J., Najita, Joan, Neufeld, David A., Sheehan, Patrick D., Stutz, Amelia M., Tobin, John J.

“…ABSTRACT We have surveyed 84 Class 0, Class I, and flat-spectrum protostars in mid-infrared [Si ii], [Fe ii], and [S i] line emission, and 11 of these in…”
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Star Formation Under the Outflow: The Discovery of a Non-thermal Jet from OMC-2 FIR 3 and Its Relationship to the Deeply Embedded FIR 4 Protostar by Osorio, Mayra, Díaz-Rodríguez, Ana K., Anglada, Guillem, Megeath, S. Thomas, Rodríguez, Luis F., Tobin, John J., Stutz, Amelia M., Furlan, Elise, Fischer, William J., Manoj, P., Gómez, José F., González-García, Beatriz, Stanke, Thomas, Watson, Dan M., Loinard, Laurent, Vavrek, Roland, Carrasco-González, Carlos

“…We carried out multiwavelength (0.7-5 cm), multi-epoch (1994-2015) Very Large Array (VLA) observations toward the region enclosing the bright far-IR sources…”
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JWST/MIRI Detection of Suprathermal OH Rotational Emissions: Probing the Dissociation of the Water by Lyα Photons near the Protostar HOPS 370 by Neufeld, David A., Manoj, P., Tyagi, Himanshu, Narang, Mayank, Watson, Dan M., Megeath, S. Thomas, Van Dishoeck, Ewine F., Gutermuth, Robert A., Stanke, Thomas, Yang, Yao-Lun, Rubinstein, Adam E., Anglada, Guillem, Beuther, Henrik, Caratti o Garatti, Alessio, Evans, Neal J., Federman, Samuel, Fischer, William J., Green, Joel, Klaassen, Pamela, Looney, Leslie W., Osorio, Mayra, Nazari, Pooneh, Tobin, John J., Tychoniec, Łukasz, Wolk, Scott

“…Abstract Using the MIRI medium-resolution spectrometer on JWST, we have detected pure rotational, suprathermal OH emissions from the vicinity of the…”
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THE MID-INFRARED EVOLUTION OF THE FU ORIONIS DISK by Green, Joel D., Jones, Olivia C., Keller, Luke D., Poteet, Charles A., Yang, Yao-Lun, Fischer, William J., Evans II, Neal J., Sargent, Benjamin A., Rebull, Luisa M.

“…ABSTRACT We present new SOFIA-FORCAST observations obtained in 2016 February of the archetypal outbursting low-mass young stellar object FU Orionis, and we…”
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The newborn planet population emerging from ring-like structures in discs by Lodato, Giuseppe, Dipierro, Giovanni, Ragusa, Enrico, Long, Feng, Herczeg, Gregory J, Pascucci, Ilaria, Pinilla, Paola, Manara, Carlo F, Tazzari, Marco, Liu, Yao, Mulders, Gijs D, Harsono, Daniel, Boehler, Yann, Ménard, François, Johnstone, Doug, Salyk, Colette, van der Plas, Gerrit, Cabrit, Sylvie, Edwards, Suzan, Fischer, William J, Hendler, Nathan, Nisini, Brunella, Rigliaco, Elisabetta, Avenhaus, Henning, Banzatti, Andrea, Gully-Santiago, Michael

“…Abstract ALMA has observed a plethora of ring-like structures in planet-forming discs at distances of 10–100 au from their host star. Although several…”
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The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. II. A Statistical Characterization of Class 0 and Class I Protostellar Disks by Tobin, John J., Sheehan, Patrick D., Megeath, S. Thomas, Díaz-Rodríguez, Ana Karla, Offner, Stella S. R., Murillo, Nadia M., van 't Hoff, Merel L. R., van Dishoeck, Ewine F., Osorio, Mayra, Anglada, Guillem, Furlan, Elise, Stutz, Amelia M., Reynolds, Nickalas, Karnath, Nicole, Fischer, William J., Persson, Magnus, Looney, Leslie W., Li, Zhi-Yun, Stephens, Ian, Chandler, Claire J., Cox, Erin, Dunham, Michael M., Tychoniec, ukasz, Kama, Mihkel, Kratter, Kaitlin, Kounkel, Marina, Mazur, Brian, Maud, Luke, Patel, Lisa, Perez, Laura, Sadavoy, Sarah I., Segura-Cox, Dominique, Sharma, Rajeeb, Stephenson, Brian, Watson, Dan M., Wyrowski, Friedrich

“…We have conducted a survey of 328 protostars in the Orion molecular clouds with the Atacama Large Millimeter/submillimeter Array at 0.87 mm at a resolution of…”
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