New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs

Autor: Burgasser, Adam J., Schneider, Adam C., Meisner, Aaron M., Caselden, Dan, Hsu, Chih-Chun, Gerasimov, Roman, Aganze, Christian, Softich, Emma, Karpoor, Preethi, Theissen, Christopher A., Brooks, Hunter, Bickle, Thomas P., Gagné, Jonathan, Artigau, Étienne, Marsset, Michaël, Rothermich, Austin, Faherty, Jacqueline K., Kirkpatrick, J. Davy, Kuchner, Marc J., Andersen, Nikolaj Stevnbak, Beaulieu, Paul, Colin, Guillaume, Gantier, Jean Marc, Gramaize, Leopold, Hamlet, Les, Hinckley, Ken, Kabatnik, Martin, Kiwy, Frank, Martin, David W., Massat, Diego H., Pendrill, William, Sainio, Arttu, Schümann, Jörg, Thévenot, Melina, Walla, Jim, Wędracki, Zbigniew, Worlds, the Backyard, Collaboration, Planet 9

We report the results of a spectroscopic survey of candidate T subdwarfs identified by the Backyard Worlds: Planet 9 program. Near-infrared spectra of 31 sources with red $J-W2$ colors and large $J$-band reduced proper motions show varying signatures

Externí odkaz: http://arxiv.org/abs/2411.01378

The Initial Mass Function Based on the Full-sky 20-pc Census of $\sim$3,600 Stars and Brown Dwarfs

Autor: Kirkpatrick, J. Davy, Marocco, Federico, Gelino, Christopher R., Raghu, Yadukrishna, Faherty, Jacqueline K., Gagliuffi, Daniella C. Bardalez, Schurr, Steven D., Apps, Kevin, Schneider, Adam C., Meisner, Aaron M., Kuchner, Marc J., Caselden, Dan, Smart, R. L., Casewell, S. L., Raddi, Roberto, Kesseli, Aurora, Andersen, Nikolaj Stevnbak, Antonini, Edoardo, Beaulieu, Paul, Bickle, Thomas P., Bilsing, Martin, Chieng, Raymond, Colin, Guillaume, Deen, Sam, Dereveanco, Alexandru, Doll, Katharina, Luca, Hugo A. Durantini, Frazer, Anya, Gantier, Jean Marc, Gramaize, Léopold, Grant, Kristin, Hamlet, Leslie K., Higashimura, Hiro, Hyogo, Michiharu, Jałowiczor, Peter A., Jonkeren, Alexander, Kabatnik, Martin, Kiwy, Frank, Martin, David W., Michaels, Marianne N., Pendrill, William, Machado, Celso Pessanha, Pumphrey, Benjamin, Rothermich, Austin, Russwurm, Rebekah, Sainio, Arttu, Sanchez, John, Sapelkin-Tambling, Fyodor Theo, Schümann, Jörg, Selg-Mann, Karl, Singh, Harshdeep, Stenner, Andres, Sun, Guoyou, Tanner, Christopher, Thévenot, Melina, Ventura, Maurizio, Voloshin, Nikita V., Walla, Jim, Wedracki, Zbigniew, Adorno, Jose I., Aganze, Christian, Allers, Katelyn N., Brooks, Hunter, Burgasser, Adam J., Calamari, Emily, Connor, Thomas, Costa, Edgardo, Eisenhardt, Peter R., Gagné, Jonathan, Gerasimov, Roman, Gonzales, Eileen C., Hsu, Chih-Chun, Kiman, Rocio, Li, Guodong, Low, Ryan, Mamajek, Eric, Pantoja, Blake M., Popinchalk, Mark, Rees, Jon M., Stern, Daniel, Suárez, Genaro, Theissen, Christopher, Tsai, Chao-Wei, Vos, Johanna M., Zurek, David, Worlds, The Backyard, Collaboration, Planet 9

A complete accounting of nearby objects -- from the highest-mass white dwarf progenitors down to low-mass brown dwarfs -- is now possible, thanks to an almost complete set of trigonometric parallax determinations from Gaia, ground-based surveys, and

Externí odkaz: http://arxiv.org/abs/2312.03639

Spitzer Follow-up of Extremely Cold Brown Dwarfs Discovered by the Backyard Worlds: Planet 9 Citizen Science Project

Autor: Meisner, Aaron M., Faherty, Jacqueline K., Kirkpatrick, J. Davy, Schneider, Adam C., Caselden, Dan, Gagne, Jonathan, Kuchner, Marc J., Burgasser, Adam J., Casewell, Sarah L., Debes, John H., Artigau, Etienne, Gagliuffi, Daniella C. Bardalez, Logsdon, Sarah E., Kiman, Rocio, Allers, Katelyn, Hsu, Chih-Chun, Wisniewski, John P., Allen, Michaela B., Beaulieu, Paul, Colin, Guillaume, Luca, Hugo A. Durantini, Goodman, Sam, Gramaize, Leopold, Hamlet, Leslie K., Hinckley, Ken, Kiwy, Frank, Martin, David W., Pendrill, William, Rothermich, Austin, Sainio, Arttu, Schumann, Jorg, Andersen, Nikolaj Stevnbak, Tanner, Christopher, Thakur, Vinod, Thevenot, Melina, Walla, Jim, Wedracki, Zbigniew, Aganze, Christian, Gerasimov, Roman, Theissen, Christopher, Worlds, The Backyard, Collaboration, Planet 9

We present Spitzer follow-up imaging of 95 candidate extremely cold brown dwarfs discovered by the Backyard Worlds: Planet 9 citizen science project, which uses visually perceived motion in multi-epoch WISE images to identify previously unrecognized

Externí odkaz: http://arxiv.org/abs/2008.06396

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W0830: an extremely cold, missing-link planetary-mass object at the low-mass end of the IMF

Autor: Bardalez Gagliuffi, Daniella, Faherty, Jacqueline, Schneider, Adam, Meisner, Aaron, Caselden, Dan, Colin, Guillaume, Goodman, Sam, Kirkpatrick, Davy, Kuchner, Marc, Gagne, Jonathan, Logsdon, Sarah, Burgasser, Adam, Allers, Katelyn, Debes, John, Wisniewski, John, Rothermich, Austin, Andersen, Nikolaj, Thevenot, Melina, Walla, Jim

Here we present an extremely cold, planetary-mass brown dwarf which bridges the temperature gap between the warmer Y dwarf population and the coldest brown dwarf ever discovered. W0830 was identified through the Backyard Worlds: Planet 9 citizen scie

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cd50fc98f52302620c59fbaffeddc903