Results 51 to 60 of about 10,855,464 (193)

Euclid: Quick Data Release (Q1) – A photometric search for ultracool dwarfs in the Euclid Deep Fields★

Astronomy & Astrophysics
We present a catalogue of 5306 new ultracool dwarf (UCD) candidates in the three Euclid Deep Fields in the Q1 data release. They range from late M to late T dwarfs, and include 1200 L and T dwarfs.
Žerjal M., Dominguez-Tagle C., Vitas N., Sedighi N., Martín E. L., Zapatero Osorio M. R., Olivares J., Muñoz Torres S., Tsilia S., Zhang J.-Y., Barrado D., Béjar V. J. S., Bouy H., Burgasser A., Cruz P., Lodieu N., Mas Buitrago P., Phan-Bao N., Solano E., Tata R., Goldman B., Mohandasan A., Reylé C., Smart R. L., Aghanim N., Altieri B., Amara A., Andreon S., Auricchio N., Baccigalupi C., Baldi M., Balestra A., Bardelli S., Battaglia P., Biviano A., Bonchi A., Branchini E., Brescia M., Brinchmann J., Camera S., Cañas-Herrera G., Capobianco V., Carbone C., Carretero J., Casas S., Castellano M., Castignani G., Cavuoti S., Chambers K. C., Cimatti A., Colodro-Conde C., Congedo G., Conselice C. J., Conversi L., Copin Y., Courbin F., Courtois H. M., Cropper M., Cuby J.-G., Da Silva A., Degaudenzi H., De Lucia G., Dolding C., Dole H., Douspis M., Dubath F., Dupac X., Dusini S., Escoffier S., Farina M., Faustini F., Ferriol S., Fotopoulou S., Frailis M., Franceschi E., Galeotta S., George K., Gillis B., Giocoli C., Gómez-Alvarez P., Gracia-Carpio J., Granett B. R., Grazian A., Grupp F., Haugan S. V. H., Hoar J., Holmes W., Hormuth F., Hornstrup A., Jahnke K., Jhabvala M., Keihänen E., Kermiche S., Kiessling A., Kubik B., Kuijken K., Kümmel M., Kunz M., Kurki-Suonio H., Le Boulc’h Q., Le Brun A. M. C., Ligori S., Lilje P. B., Lindholm V., Lloro I., Mainetti G., Maino D., Maiorano E., Mansutti O., Marggraf O., Martinelli M., Martinet N., Marulli F., Massey R., Medinaceli E., Mei S., Mellier Y., Meneghetti M., Merlin E., Meylan G., Mora A., Moresco M., Moscardini L., Nakajima R., Neissner C., Niemi S.-M., Padilla C., Paltani S., Pasian F., Pedersen K., Percival W. J., Pettorino V., Pires S., Polenta G., Poncet M., Popa L. A., Pozzetti L., Raison F., Rebolo R., Renzi A., Rhodes J., Riccio G., Romelli E., Roncarelli M., Saglia R., Sakr Z., Sapone D., Sartoris B., Schewtschenko J. A., Schirmer M., Schneider P., Secroun A., Seidel G., Seiffert M., Serrano S., Simon P., Sirignano C., Sirri G., Stanco L., Steinwagner J., Tallada-Crespí P., Taylor A. N., Tereno I., Toft S., Toledo-Moreo R., Torradeflot F., Tsyganov A., Tutusaus I., Valenziano L., Valiviita J., Vassallo T., Verdoes Kleijn G., Veropalumbo A., Wang Y., Weller J., Zacchei A., Zamorani G., Zerbi F. M., Zucca E., Martín-Fleitas J., Scottez V.   +180 more
doaj   +1 more source

WIYN Open Cluster Study 89. M48 (NGC 2548) 2: Lithium Abundances in the 420 Myr Open Cluster M48 from Giants through K Dwarfs

The Astrophysical Journal, 2023
We consider WIYN/Hydra spectra of 329 photometric candidate members of the 420 Myr old open cluster M48 and report lithium detections or upper limits for 234 members and likely members.
Qinghui Sun, Constantine P. Deliyannis, Aaron Steinhauer, Barbara J. Anthony-Twarog, Bruce A. Twarog   +4 more
doaj   +1 more source

THE PHYSICAL PROPERTIES OF FOUR ∼600 K T DWARFS [PDF]

The Astrophysical Journal, 2009
26 pages, including 2 Tables and 9 Figures, accepted for publication in Astrophysical ...
Leggett, S. K., Cushing, Michael C., Saumon, D., Marley, M. S., Roellig, T. L., Warren, S. J., Burningham, Ben, Jones, H. R. A., Kirkpatrick, J. D., Lodieu, N., Lucas, P. W., Mainzer, A. K., Martín, E.L., McCaughrean, M. J., Pinfield, D. J., Sloan, G. C., Smart, R. L., Tamura, M., Van Cleve, J.   +18 more
openaire   +3 more sources

L and T Dwarf Models and the L to T Transition [PDF]

The Astrophysical Journal, 2006
accepted to the Astrophysical Journal, 21 figures (20 in color); spectral models in electronic form available at http://zenith.as.arizona.edu ...
Burrows, Adam, Sudarsky, David, Hubeny, Ivan   +2 more
openaire   +2 more sources

New y and T Dwarfs from WISE Identified by Methane Imaging [PDF]

, 2018
We identify new Y- and T-type brown dwarfs from the WISE All Sky data release using images obtained in filters that divide the traditional near-infrared H and J bands into two halves—specifically CH_(4s) and CH_4l in the H and J2, and J3 in the J.
Kirkpatrick, JD, Faherty, JK, Cushing, M, Gelino, CR, Burgasser, AJ, Tinney, CG ; https://orcid.org/, Mace, GN, Wright, EL, Sheppard, SS   +8 more
core   +1 more source

Identifying nearby field T dwarfs in the UKIDSS Galactic Clusters Survey [PDF]

, 2009
We present the discovery of two new late-T dwarfs identified in the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Clusters Survey (GCS) Data Release 2 (DR2).
Lodieu, N., Pinfield, D.J., Burningham, B., Hambly, N.C.   +3 more
core   +1 more source

The 2MASS Wide-Field T Dwarf Search. V. Discovery of a T Dwarf via Methane Imaging [PDF]

The Astronomical Journal, 2005
Accepted for publication in AJ.
Ellis, SC, Tinney, CG, Burgasser, A, Kirkpatrick, JD, Mcelwain, M   +4 more
openaire   +3 more sources

The Coldest Known Y Dwarfs: Estimates of Their Effective Temperatures

The Astrophysical Journal
For a decade there has been a factor of 2.5 gap in luminosity between the 275 K WISE J085510.83-071442.5 and all other Y dwarfs, with T _eff  ≳ 350 K. Recently, three objects were found that may fall in this gap.
S. K. Leggett
doaj   +1 more source

Investigating Possible Binarity for GJ 229B

The Astrophysical Journal Letters, 2023
GJ 229B, the first type-T brown dwarf to be discovered, has presented a tension between comparisons with evolutionary models and the larger-than-expected mass and radius values derived from spectroscopic and astrometric observations.
Alex R. Howe, Avi M. Mandell, Michael W. McElwain   +2 more
doaj   +1 more source

Constraining the Distribution of L and T Dwarfs in the Galaxy

The Astrophysical Journal, 2005
We estimate the thin disk scale height of the Galactic population of L- & T-dwarfs based on star counts from 15 deep parallel fields from the Hubble Space Telescope. From these observations, we have identified 28 candidate L- & T- dwarfs based on their (i'-z') color and morphology.
Ryan Jr., Russell E., Hathi, Nimish P., Cohen, Seth H., Windhorst, Rogier A.   +3 more
openaire   +2 more sources