Results 91 to 100 of about 10,855,464 (193)

Near-Infrared Photometry and Spectroscopy of L and T Dwarfs: The Effects of Temperature, Clouds, and Gravity [PDF]

, 2017
We present new JHK photometry on the MKO-NIR system and JHK spectroscopy for a large sample of L and T dwarfs. Photometry has been obtained for 71 dwarfs, and spectroscopy for 56.
Chiu, K., Williams, C. C., Ivezi?, Z., Finkbeiner, Douglas, Vrba, F. J., Guetter, H. H., Hennawi, J., Canzian, B., Schlegel, D. J., Strauss, M. A., Luginbuhl, C. B., Glazebrook, K., Munn, J. A., Leggett, S. K., Geballe, T. R., Marley, M. S., Tsvetanov, Z. I., Knapp, G. R., Fan, X., Schneider, Donald P., Zheng, W., Henden, A. A., Hoversten, E. A., Brinkmann, J., Lupton, R. H., Golimowski, D. A., Hendrickson, M., Uomoto, A., Gunn, J. E.   +28 more
core   +1 more source

SPHEREx 0.75–5 μm Spectra for a Sequence of Nearby Brown Dwarfs

The Astrophysical Journal
The SPHEREx all-sky survey has now measured the R ∼ 40–100 infrared spectra of thousands of nearby brown dwarfs in the chemically rich 0.75–5 μ m range.
Zafar Rustamkulov, J. Davy Kirkpatrick, Rachel Akeson, Michael W. Werner, Matthew L. N. Ashby, Tzu-Ching Chang, Shuang-Shuang Chen, Asantha Cooray, Brendan P. Crill, Olivier Doré, C. Darren Dowell, Andreas L. Faisst, Howard Hui, Woong-Seob Jeong, Miju Kang, Phil M. Korngut, Carey M. Lisse, Daniel C. Masters, Gary J. Melnick, Chi H. Nguyen, Roberta Paladini, Volker Tolls, Yujin Yang, Michael Zemcov   +23 more
doaj   +1 more source

Discovery of the Remarkably Red L/T Transition Object VHS J183135.58-551355.9

The Astronomical Journal
We present the discovery of VHS J183135.58−551355.9 (hereafter VHS J1831−5513), an L/T transition dwarf identified as a result of its unusually red near-infrared colors ( J − K _S = 3.633 ± 0.277 mag; J − W 2 = 6.249 ± 0.245 mag) from the VISTA ...
Thomas P. Bickle, Adam C. Schneider, Jonathan Gagné, Jacqueline K. Faherty, Austin Rothermich, Johanna M. Vos, Genaro Suárez, J. Davy Kirkpatrick, Aaron M. Meisner, Marc J. Kuchner, Adam J. Burgasser, Federico Marocco, Sarah L. Casewell, Dan Caselden, Daniella C. Bardalez Gagliuffi, The Backyard Worlds: Planet 9 Collaboration   +15 more
doaj   +1 more source

The 100 pc White Dwarf Sample in the SDSS Footprint. II. A New Look at the Spectral Evolution of White Dwarfs

The Astrophysical Journal
We increase the spectroscopic completeness of the 100 pc white dwarf sample in the Sloan Digital Sky Survey footprint with 840 additional spectra. Our spectroscopy is 86% complete for white dwarfs hotter than T _eff  = 5000 K, where H α remains visible ...
Mukremin Kilic, Pierre Bergeron, Simon Blouin, Adam Moss, Warren R. Brown, Antoine Bédard, Gracyn Jewett, Marcel A. Agüeros   +7 more
doaj   +1 more source

A Large Sample of JWST/NIRSpec Brown Dwarfs: New Distant Discoveries

The Astrophysical Journal Supplement Series
Brown dwarfs are essential probes of stellar and planetary formation, yet their low luminosities pose challenges for detection at large Galactic distances.
Zhijun Tu, Shu Wang, Xiaodian Chen, Jifeng Liu   +3 more
doaj   +1 more source

Two late-T dwarfs at kiloparsec distances revealed by JWST UNCOVER survey [PDF]

We conducted a search for brown dwarf candidates in a James Webb Space Telescope deep field around A2744 to investigate the space density of these objects at kiloparsec distances. Our methodology employed an initial selection based on photometric colours,
Galvez-Ortiz, M. C., Zhou, S. Y., Peng, H. H., Li, D. H., Jones, H. R. A., Zhang, Z. H.   +5 more
core   +1 more source

An Image-based Search for L and T Dwarf Candidates in Pan-STARRS with Object Detection

The Astrophysical Journal Supplement Series
Ultracool dwarfs are faint at optical wavelengths, and catalog-based color selection can therefore miss sources with low signal-to-noise ratios or incomplete photometry.
Yuechang Liu, Meng Liu, Kai Wang, Yude Bu   +3 more
doaj   +1 more source

Spitzer + Hubble Space Telescope Parallaxes of 13 Late T and Y Dwarfs

The Astronomical Journal
We present astrometric measurements for 13 cold brown dwarfs in the solar neighborhood ( d  
Federico Marocco, J. Davy Kirkpatrick, Richard L. Smart, Adam C. Schneider, Dan Caselden, Edgardo Costa, Michael C. Cushing, Maximiliano Dirk, Peter R. M. Eisenhardt, Jacqueline K. Faherty, Christopher R. Gelino, Marc J. Kuchner, Aaron M. Meisner, Rene A. Mendez, Robert A. Stiller, Edward L. Wright   +15 more
doaj   +1 more source

Infrared Colors of L and T Dwarfs

, 2001
We discuss the behaviour of the JHKL'M' colors of L and T dwarfs, based on photometric and spectroscopic data obtained at the United Kingdom Infrared Telescope in Hawaii. We have measured the first accurate M' photometry for L and T dwarfs. The K-M' colors of T dwarfs are much bluer than predicted by published models, suggesting that CO may be more ...
Leggett, S. K., Golimowski, D. A., Fan, X., Geballe, T. R., Knapp, G. R.   +4 more
openaire   +2 more sources

The GALAH Survey : Lithium-strong KM dwarfs [PDF]

, 2019
Identifying and characterizing young stars in the Solar neighbourhood is essential to find and describe planets in the early stages of their evolution. This work seeks to identify nearby young stars showing a lithium 6708 Å absorption line in the GALAH ...
Martell, S.,, Traven, G., Zwitter, T., Casagrande, L., De Silva, G., Horner, J., De Silva, G.,, Martell, S., Nordlander, T., Buder, S.,, Zerjal, M., GALAH Collaboration, Nordlander, T.,, Buder, S., Casagrande, L.,, Lin, J., Čotar, K., Åotar, K.,, Zwitter, T.,, Ireland, M. J.,, Collaboration, G., Åotar, K., Ireland, M., Ireland, M. J., Zerjal, M.,, Horner, J.,, Lin, J.,, Buder, Sven, De Silva, Gayandhi, Žerjal, Maruša, Casagrande, Luca, Nordlander, Thomas, Ireland, Michael, Lin, Jane, Martell, Sarah, Horner, Jonathan   +35 more
core   +1 more source