Results 11 to 20 of about 5,171 (308)

Brown Dwarf Companions to White Dwarfs [PDF]

AIP Conference Proceedings, 2011
Brown dwarf companions to white dwarfs are rare, but recent infra-red surveys are slowly reveal- ing examples. We present new observations of the post-common envelope binary WD0137-349, which reveals the effects of irradiation on the ~ 0.05M* secondary, and new observations of GD 1400 which show that it too is a close, post-comon envelope system.
Matt R. Burleigh, Paul R. Steele, Paul D. Dobbie, Jay Farihi, Ralf Napiwotzki, Pierre F. L. Maxted, Martin A. Barstow, Richard F. Jameson, Sarah L. Casewell, Boris T. Gaensicke, Tom R. Marsh, Sonja Schuh, Horst Drechsel, Ulrich Heber   +13 more
core   +5 more sources

Binary brown dwarfs in the Galactic halo? [PDF]

Monthly Notices of the Royal Astronomical Society, 1998
Microlensing events towards the Large Magellanic Cloud entail that a sizable fraction of dark matter is in the form of MACHOs (Massive Astrophysical Compact Halo Objects), presumably located in the halo of the Galaxy. Within the present uncertainties, brown dwarfs are a viable candidate for MACHOs.
DE PAOLIS, Francesco, INGROSSO, Gabriele, P.H. JETZER, M. RONCADELLI   +3 more
openaire   +6 more sources

37 NEW T-TYPE BROWN DWARFS IN THE CANADA-FRANCE BROWN DWARFS SURVEY

The Astronomical Journal, 2011
The Canada-France Brown Dwarfs Survey is an i'- and z'-band survey realized with MegaCam at the Canada-France-Hawaii Telescope that covers a surface area of 780 deg2. Image analysis is now completed while J-band follow-up campaigns are ~90% done. The survey identified about 70 T dwarf candidates, of which 43 now have near-infrared spectra obtained with
Albert, L., Artigau, E., Delorme, P., Reylé, C., Forveille, T., Delfosse, X., Willott, C.   +6 more
openaire   +5 more sources

Three new brown dwarfs and a massive hot Jupiter revealed by TESS around early-type stars [PDF]

, 2022
Context. The detection and characterization of exoplanets and brown dwarfs around massive AF-type stars is essential to investigate and constrain the impact of stellar mass on planet properties.
Kevin I. Collins, Adrien Deline, Grieves, Nolan, Srdoc, Gregor, Richard P. Schwarz, Giacalone, Steven, James S. Jenkins, Don J. Radford, Alexander Rudat, Duncan J. Wright, Galland, Franck, Alexis Heitzmann, Ting, Eric B., Matthew J. Hooton, Tianjun Gan, Jon Otegi, Heitzmann, Alexis, Yinan Zhao, Ian J. M. Crossfield, Peña Rojas, Pablo A., Eric B. Ting, Gan, Tianjun, Galland, Frank, Steven Giacalone, François Bouchy, Jon M. Jenkins, Michael B. Lund, Radford, Don J., Courtney D. Dressing, Addison, Brett, Ulmer-Moll, Solène, Theron Carmichael, Bieryla, Allyson, Deline, Adrien, Zhao, Yinan, Stéphane Udry, Rafael Brahm, Ismael Mireles, George Zhou, Yanzhe Zhang, Monika Lendl, Cointepas, Marion, Franck Galland, Jessie L. Christiansen, Samuel Gill, Latham, David W., Phil Evans, Collins, Kevin I., Wittenmyer, Robert A., Brahm, Rafael, Crossfield, Ian J. M., Christiansen, Jessie L., Robert A. Wittenmyer, Pablo A. Peña Rojas, Olga Suarez, Keivan G. Stassun, David W. Latham, Gill, Samuel, Psaridi, Angelica, Collins, Karen A., Carmichael, Theron, Hooton, Matthew J., Angelica Psaridi, Hooton, Matthew J., Dressing, Courtney D., Rudat, Alexander, Joseph E. Rodriguez, Addison Brett, Lund, Michael B., Lendl, Monika, Zhou, George, Brett Addison, Dany Mounzer, Jenkins, Jon M., Schlieder, Joshua E., Wright, Duncan J., Allyson Bieryla, Suarez, Olga, Karen A. Collins, Marion Cointepas, Wittenmyer Robert A., Shporer, Avi, Schwarz, Richard P., Otegi, Jon, Gregor Srdoc, Stassun, Keivan G., Avi Shporer, Solène Ulmer-Moll, Bouchy, François, Brahm, Rafael, Mireles, Ismael, Stockdale, Chris, Zhang, Yanzhe, Jenkins, James S., Chris Stockdale, Rodriguez, Joseph E., Nolan Grieves, Evans, Phil, Joshua E. Schlieder, Udry, Stéphane, Mounzer, Dany   +100 more
core   +1 more source

Constraints on the formation of brown dwarfs by turbulent compression [PDF]

, 2019
We perform radiation hydrodynamical simulations in spherical symmetry in order to investigate the formation of very low mass objects, i.e. brown dwarfs, by external compression.
Inutsuka, Shu-ichiro, Stamer, Torsten
core   +1 more source

DA white dwarfs in Sloan Digital Sky Survey Data Release 7 and a search for infrared excess emission [PDF]

, 2011
We present a method which uses colour–colour cuts on the Sloan Digital Sky Survey (SDSS) photometry to select white dwarfs with hydrogen-rich (DA) atmospheres without the recourse to spectroscopy.
Farihi, J., Breedt, E, J. Girven, Koester, Detlev, Gänsicke, B. T., Gänsicke, BT, Farihi, J, Koester, D, Steeghs, D., Gaensicke, B. T., Koester, D., Girven, Jonathan, Breedt, E., D. Koester, Parsons, S. G., D. Steeghs, Parsons, SG, Girven, J., B. T. Gänsicke, Girven, J   +19 more
core   +1 more source

Discovery of the substellar transition zone of transitional brown dwarfs between stars and degenerate brown dwarfs

, 2021
The destiny of a star is depending on the status of hydrogen fusion that it can reach after its formation. Stars have steady hydrogen fusion and can maintain their luminosity. Degenerate brown dwarfs (D-BD) have no energy supply from hydrogen fusion thus
Zhang, ZengHua
core   +1 more source

Atmosphere Models of Highly Irradiated Brown Dwarfs

, 2021
While highly irradiated brown dwarfs are rare, the handful of known systems provide a unique lens into irradiated atmospheres. Ultra-short-period brown dwarfs around white dwarfs can reach atmospheric temperatures hotter than many stars. Such objects are
Lothringer, Joshua D., Casewell, Sarah L.   +1 more
core   +1 more source

BROWN DWARF DISKS WITH ALMA

The Astrophysical Journal, 2014
15 pages, 10 figures, accepted for publication in ...
L. Ricci, L. Testi, A. Natta, A. Scholz, I. de Gregorio-Monsalvo, A. Isella   +5 more
openaire   +5 more sources

THE LUMINOSITIES OF THE COLDEST BROWN DWARFS [PDF]

The Astrophysical Journal, 2014
Accepted for publication in The Astrophysical Journal (Oct 2, 2014).
C. G. Tinney, Jacqueline K. Faherty, J. Davy Kirkpatrick, Mike Cushing, Caroline V. Morley, Edward L. Wright   +5 more
openaire   +3 more sources