The Diversity of Cold Worlds: a blended-light binary straddling the T/Y transition in brown dwarfs

Authors: Gagliuffi, Daniella C. Bardalez, Faherty, Jacqueline K., Suarez, Genaro, Merchan, Sherelyn Alejandro, Lacy, Brianna, Burningham, Ben, Matuszewska, Klara, Kiman, Rocio, Vos, Johanna M., Rothermich, Austin, Gagne, Jonathan, Morley, Caroline, Rowland, Melanie J., Caselden, Dan, Meisner, Aaron, Schneider, Adam C., Kuchner, Marc J., Beichman, Charles A., Eisenhardt, Peter R., Gelino, Christopher R., Gharib-Nezhad, Ehsan, Gonzales, Eileen C., Marocco, Federico, Whiteford, Niall, Kirkpatrick, J. Davy

Subject Terms: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/2503.02025

Protosolar D-to-H abundance and one part-per-billion PH$_{3}$ in the coldest brown dwarf

Authors: Rowland, Melanie J., Morley, Caroline V., Miles, Brittany E., Suárez, Genaro, Faherty, Jacqueline K., Skemer, Andrew J., Beiler, Samuel A., Line, Michael R., Bjoraker, Gordon L., Fortney, Jonathan J., Vos, Johanna M., Merchan, Sherelyn Alejandro, Marley, Mark, Burningham, Ben, Freedman, Richard, Gharib-Nezhad, Ehsan, Batalha, Natasha, Lupu, Roxana, Visscher, Channon, Schneider, Adam C., Geballe, T. R., Carter, Aarynn, Allers, Katelyn, Mang, James, Apai, Dániel, Limbach, Mary Anne, Wilson, Mikayla J.

Subject Terms: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/2411.14541

Generative AI for Overall Mission Effectiveness at the Habitable Worlds Observatory

Authors: Shabram, Megan, McClelland, Ryan, Wu, John, Venkataram, Hamsa Shwetha, Segars, Heidi, Dean, Bruce, Ye, Christine, Moin, Aquib, Ansdell, Megan, Moussa, Mark, Rebbapragada, Umaa, Valizadegan, Hamed, Perini, Dominick, Ko, Glenn, Da Poian, Victoria, Gharib-Nezhad, Sam, Cataldo, Giuseppe

Subject Terms: Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2410.16609

TelescopeML -- I. An End-to-End Python Package for Interpreting Telescope Datasets through Training Machine Learning Models, Generating Statistical Reports, and Visualizing Results

Authors: Ehsan, Gharib-Nezhad, Batalha, Natasha E., Valizadegan, Hamed, Martinho, Miguel J. S., Habibi, Mahdi, Nookula, Gopal

Source: Journal of Open Source Software, 9(99), 6346 (2024)

Subject Terms: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics, Computer Science - Machine Learning

Access URL: http://arxiv.org/abs/2407.16917

Methane Emission From a Cool Brown Dwarf

Authors: Faherty, Jacqueline K., Burningham, Ben, Gagné, Jonathan, Suárez, Genaro, Vos, Johanna M., Merchan, Sherelyn Alejandro, Morley, Caroline V., Rowland, Melanie, Lacy, Brianna, Kiman, Rocio, Caselden, Dan, Kirkpatrick, J. Davy, Meisner, Aaron, Schneider, Adam C., Kuchner, Marc Jason, Gagliuffi, Daniella Carolina Bardalez, Beichman, Charles, Eisenhardt, Peter, Gelino, Christopher R., Gharib-Nezhad, Ehsan, Gonzales, Eileen, Marocco, Federico, Rothermich, Austin James, Whiteford, Niall

Subject Terms: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/2404.10977

Data availability and requirements relevant for the Ariel space mission and other exoplanet atmosphere applications

Authors: Chubb, Katy L., Robert, Séverine, Sousa-Silva, Clara, Yurchenko, Sergei N., Allard, Nicole F., Boudon, Vincent, Buldyreva, Jeanna, Bultel, Benjamin, Coustenis, Athena, Foltynowicz, Aleksandra, Gordon, Iouli E., Hargreaves, Robert J., Helling, Christiane, Hill, Christian, Hrodmarsson, Helgi Rafn, Karman, Tijs, Lecoq-Molinos, Helena, Migliorini, Alessandra, Rey, Michaël, Richard, Cyril, Sadiek, Ibrahim, Schmidt, Frédéric, Sokolov, Andrei, Stefani, Stefania, Tennyson, Jonathan, Venot, Olivia, Wright, Sam O. M., Arenales-Lope, Rosa, Barstow, Joanna K., Bocchieri, Andrea, Carrasco, Nathalie, Dubey, Dwaipayan, Egorov, Oleg, Muñoz, Antonio García, Ehsan, Gharib-Nezhad, Gkouvelis, Leonardos, Grübel, Fabian, Irwin, Patrick Gerard Joseph, Knížek, Antonín, Lewis, David A., Lodge, Matt G., Ma, Sushuang, Martins, Zita, Molaverdikhani, Karan, Morello, Giuseppe, Nikitin, Andrei, Panek, Emilie, Rengel, Miriam, Rinaldi, Giovanna, Skinner, Jack W., Tinetti, Giovanna, van Kempen, Tim A., Yang, Jingxuan, Zingales, Tiziano

Source: RAS Techniques and Instruments, Volume 3, Issue 1, January 2024, Pages 636-690

Subject Terms: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/2404.02188

The Sonora Substellar Atmosphere Models. III. Diamondback: Atmospheric Properties, Spectra, and Evolution for Warm Cloudy Substellar Objects

Authors: Morley, Caroline V., Mukherjee, Sagnick, Marley, Mark S., Fortney, Jonathan J., Visscher, Channon, Lupu, Roxana, Gharib-Nezhad, Ehsan, Thorngren, Daniel, Freedman, Richard

Subject Terms: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/2402.00758

The Sonora Substellar Atmosphere Models. IV. Elf Owl: Atmospheric Mixing and Chemical Disequilibrium with Varying Metallicity and C/O Ratios

Authors: Mukherjee, Sagnick, Fortney, Jonathan J., Morley, Caroline V., Batalha, Natasha E., Marley, Mark S., Karalidi, Theodora, Visscher, Channon, Lupu, Roxana, Freedman, Richard, Gharib-Nezhad, Ehsan

Source: The Astrophysical Journal, Volume 963, Issue 1, id.73, 26 pp, March 2024

Subject Terms: Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics

Access URL: http://arxiv.org/abs/2402.00756

The impact of spectral line wing cut-off: Recommended standard method with application to MAESTRO opacity database

Authors: Ehsan, Gharib-Nezhad, Batalha, Natasha E., Chubb, Katy, Freedman, Richard, Gordon, Iouli E., Gamache, Robert R., Hargreaves, Robert J., Lewis, Nikole K., Tennyson, Jonathan, Yurchenko, Sergei N.

Source: RAS Techniques and Instruments, 2023, rzad058

Subject Terms: Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2401.03056

The SPHINX M-dwarf Spectral Grid. I. Benchmarking New Model Atmospheres to Derive Fundamental M-Dwarf Properties

Authors: Iyer, Aishwarya R., Line, Michael R., Muirhead, Philip S., Fortney, Jonathan J., Gharib-Nezhad, Ehsan

Subject Terms: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/2206.12010

A unique hot Jupiter spectral sequence with evidence for compositional diversity

Authors: Mansfield, Megan, Line, Michael R., Bean, Jacob L., Fortney, Jonathan J., Parmentier, Vivien, Wiser, Lindsey, Kempton, Eliza M. -R., Gharib-Nezhad, Ehsan, Sing, David K., López-Morales, Mercedes, Baxter, Claire, Désert, Jean-Michel, Swain, Mark R., Roudier, Gael M.

Subject Terms: Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/2110.11272

The Diversity of Cold Worlds: A Blended-light Binary Straddling the T/Y Transition in Brown Dwarfs

Authors: Daniella C. Bardalez Gagliuffi, Jacqueline K. Faherty, Genaro Suárez, Sherelyn Alejandro Merchan, Brianna Lacy, Ben Burningham, Klara Matuszewska, Rocio Kiman, Johanna M. Vos, Austin Rothermich, Jonathan Gagné, Caroline Morley, Melanie J. Rowland, Dan Caselden, Aaron Meisner, Adam C. Schneider, Marc J. Kuchner, Charles A. Beichman, Peter R. Eisenhardt, Christopher R. Gelino, Ehsan Gharib-Nezhad, Eileen C. Gonzales, Federico Marocco, Niall Whiteford, J. Davy Kirkpatrick

Source: The Astrophysical Journal, Vol 984, Iss 1, p 74 (2025)

Subject Terms: Y dwarfs, James Webb Space Telescope, Spectroscopy, Binary stars, Brown dwarfs, Astrophysics, QB460-466

File Description: electronic resource

Relation: https://doaj.org/toc/1538-4357

Access URL: https://doaj.org/article/36a23c9a6b80420aaf24beccd69d5361

TelescopeML. II. Convolutional Neural Networks for Predicting Brown Dwarf Atmospheric Parameters

Authors: Ehsan (Sam) Gharib-Nezhad, Hamed Valizadegan, Natasha E. Batalha, Miguel J. S. Martinho, Ben W.P. Lew

Source: The Astrophysical Journal, Vol 981, Iss 1, p 67 (2025)

Subject Terms: Brown dwarfs, Convolutional neural networks, T dwarfs, Atmospheric composition, Astrophysics, QB460-466

File Description: electronic resource

Relation: https://doaj.org/toc/1538-4357

Access URL: https://doaj.org/article/bef827ec34b04cbc920fa970b4820cf4

Following the Lithium: Tracing Li-bearing Molecules Across Age, Mass, and Gravity in Brown Dwarfs

Authors: Gharib-Nezhad, Ehsan, Marley, Mark S., Batalha, Natasha E., Visscher, Channon, Freedman, Richard S., Lupu, Roxana E.

Subject Terms: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/2106.00781

Decomposing the Iron Cross-Correlation Signal of the Ultra-Hot Jupiter WASP-76b in Transmission using 3D Monte-Carlo Radiative Transfer

Authors: Wardenier, Joost P., Parmentier, Vivien, Lee, Elspeth K. H., Line, Michael R., Gharib-Nezhad, Ehsan

Subject Terms: Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/2105.11034

EXOPLINES: Molecular Absorption Cross-Section Database for Brown Dwarf and Giant Exoplanet Atmospheres

Authors: Gharib-Nezhad, Ehsan, Iyer, Aishwarya R., Line, Michael R., Freedman, Richard S., Marley, Mark S., Batalha, Natasha E.

Subject Terms: Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics

Access URL: http://arxiv.org/abs/2104.00264

Protosolar D-to-H Abundance and One Part per Billion PH3 in the Coldest Brown Dwarf

Authors: Melanie J. Rowland, Caroline V. Morley, Brittany E. Miles, Genaro Suarez, Jacqueline K. Faherty, Andrew J. Skemer, Samuel A. Beiler, Michael R. Line, Gordon L. Bjoraker, Jonathan J. Fortney, Johanna M. Vos, Sherelyn Alejandro Merchan, Mark Marley, Ben Burningham, Richard Freedman, Ehsan Gharib-Nezhad, Natasha Batalha, Roxana Lupu, Channon Visscher, Adam C. Schneider, T. R. Geballe, Aarynn Carter, Katelyn Allers, James Mang, Dániel Apai, Mary Anne Limbach, Mikayla J. Wilson

Source: The Astrophysical Journal Letters, Vol 977, Iss 2, p L49 (2024)

Subject Terms: Planetary atmospheres, Brown dwarfs, Y dwarfs, Exoplanet atmospheres, Exoplanet atmospheric composition, Astrophysics, QB460-466

File Description: electronic resource

Relation: https://doaj.org/toc/2041-8205

Access URL: https://doaj.org/article/ec648dfb09184b2aba804abcbe80f96b

H2-Induced Pressure Broadening and Pressure Shift in the P-Branch of the v3 Band of CH4 from 300 to 700 K

Authors: Gharib-Nezhad, Ehsan, Heays, Alan N., Bechtel, Hans A., Lyons, James R.

Subject Terms: Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/1905.11493

The Need for Laboratory Measurements and Ab Initio Studies to Aid Understanding of Exoplanetary Atmospheres

Authors: Fortney, Jonathan J., Robinson, Tyler D., Domagal-Goldman, Shawn, Del Genio, Anthony D., Gordon, Iouli E., Gharib-Nezhad, Ehsan, Lewis, Nikole, Sousa-Silva, Clara, Airapetian, Vladimir, Drouin, Brian, Hargreaves, Robert J., Huang, Xinchuan, Karman, Tijs, Ramirez, Ramses M., Rieker, Gregory B., Tennyson, Jonathan, Wordsworth, Robin, Yurchenko, Sergei N, Johnson, Alexandria V, Lee, Timothy J., Dong, Chuanfei, Kane, Stephen, Lopez-Morales, Mercedes, Fauchez, Thomas, Lee, Timothy, Marley, Mark S., Sung, Keeyoon, Haghighipour, Nader, Robinson, Tyler, Horst, Sarah, Gao, Peter, Kao, Der-you, Dressing, Courtney, Lupu, Roxana, Savin, Daniel Wolf, Fleury, Benjamin, Venot, Olivia, Ascenzi, Daniela, Milam, Stefanie, Linnartz, Harold, Gudipati, Murthy, Gronoff, Guillaume, Salama, Farid, Gavilan, Lisseth, Bouwman, Jordy, Turbet, Martin, Benilan, Yves, Henderson, Bryana, Batalha, Natalie, Jensen-Clem, Rebecca, Lyons, Timothy, Freedman, Richard, Schwieterman, Edward, Goyal, Jayesh, Mancini, Luigi, Irwin, Patrick, Desert, Jean-Michel, Molaverdikhani, Karan, Gizis, John, Taylor, Jake, Lothringer, Joshua, Pierrehumbert, Raymond, Zellem, Robert, Batalha, Natasha, Rugheimer, Sarah, Lustig-Yaeger, Jacob, Hu, Renyu, Kempton, Eliza, Arney, Giada, Line, Mike, Alam, Munazza, Moses, Julianne, Iro, Nicolas, Kreidberg, Laura, Blecic, Jasmina, Louden, Tom, Molliere, Paul, Stevenson, Kevin, Swain, Mark, Bott, Kimberly, Madhusudhan, Nikku, Krissansen-Totton, Joshua, Deming, Drake, Kitiashvili, Irina, Shkolnik, Evgenya, Rustamkulov, Zafar, Rogers, Leslie, Close, Laird

Subject Terms: Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/1905.07064

The Influence of H2O Pressure Broadening in High Metallicity Exoplanet Atmospheres

Authors: Gharib-Nezhad, Ehsan, Line, Michael R.

Subject Terms: Astrophysics - Earth and Planetary Astrophysics

Access URL: http://arxiv.org/abs/1809.02548