Results 21 to 30 of about 1,220,192 (373)

The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au [PDF]

Astronomical Journal, 2019
We present a statistical analysis of the first 300 stars observed by the Gemini Planet Imager Exoplanet Survey. This subsample includes six detected planets and three brown dwarfs; from these detections and our contrast curves we infer the underlying ...
E. Nielsen, R. D. de Rosa, B. Macintosh, Jason J. Wang, J. Ruffio, E. Chiang, M. Marley, D. Saumon, D. Savransky, S. Mark Ammons, V. Bailey, T. Barman, C. Blain, J. Bulger, A. Burrows, J. Chilcote, T. Cotten, I. Czekala, R. Doyon, G. Duchêne, T. Esposito, D. Fabrycky, M. Fitzgerald, K. Follette, J. Fortney, B. Gerard, S. Goodsell, J. Graham, A. Greenbaum, P. Hibon, S. Hinkley, L. Hirsch, J. Hom, L. Hung, Rebekah Ilene Dawson, P. Ingraham, P. Kalas, Q. Konopacky, J. Larkin, Eve J. Lee, Jonathan W. Lin, J. Maire, F. Marchis, C. Marois, S. Metchev, M. Millar-Blanchaer, K. Morzinski, R. Oppenheimer, D. Palmer, J. Patience, M. Perrin, L. Poyneer, L. Pueyo, R. Rafikov, A. Rajan, J. Rameau, F. Rantakyrö, B. Ren, A. Schneider, A. Sivaramakrishnan, I. Song, R. Soummer, M. Tallis, Sandrine Thomas, K. Ward-Duong, S. Wolff   +65 more
semanticscholar   +1 more source

WD1032 + 011, an inflated brown dwarf in an old eclipsing binary with a white dwarf [PDF]

, 2020
We present the discovery of only the third brown dwarf known to eclipse a non-accreting white dwarf. Gaia parallax information and multi-colour photometry confirm that the white dwarf is cool (9950$\pm$150K) and has a low mass (0.45$\pm$0.05~MSun), and ...
S. Casewell, C. Belardi, S. Parsons, S. Littlefair, I. Braker, J. Hermes, J. Debes, Z. Vanderbosch, M. Burleigh, B. Gänsicke, V. Dhillon, V. Dhillon, T. Marsh, D. Winget, K. I. Winget   +14 more
semanticscholar   +1 more source

The formation of brown dwarfs [PDF]

Astronomische Nachrichten, 2005
AbstractWe review four mechanisms for forming brown dwarfs: (i) turbulent fragmentation (producing very low‐mass prestellar cores); (ii) gravitational instabilities in discs; (iii) dynamical ejection of stellar embryos from their placental cores; and (iv) photo‐erosion of pre‐existing cores in HII regions.
Anthony Peter Whitworth, Simon P. Goodwin   +1 more
openaire   +4 more sources

Population-level Eccentricity Distributions of Imaged Exoplanets and Brown Dwarf Companions: Dynamical Evidence for Distinct Formation Channels [PDF]

Astronomical Journal, 2019
The orbital eccentricities of directly imaged exoplanets and brown dwarf companions provide clues about their formation and dynamical histories. We combine new high-contrast imaging observations of substellar companions obtained primarily with Keck/NIRC2
B. Bowler, S. Blunt, E. Nielsen
semanticscholar   +1 more source

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
openaire   +4 more sources

NGTS-7Ab: an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf [PDF]

Monthly notices of the Royal Astronomical Society, 2019
We present the discovery of NGTS-7Ab, a high-mass brown dwarf transiting an M dwarf with a period of 16.2 h, discovered as part of the Next Generation Transit Survey (NGTS).
J. Jackman, P. Wheatley, D. Bayliss, S. Gill, S. Hodgkin, M. Burleigh, I. Braker, M. Günther, T. Louden, O. Turner, D. Anderson, C. Belardi, F. Bouchy, J. Briegal, E. Bryant, J. Cabrera, S. Casewell, A. Chaushev, J. Costes, S. Csizmadia, P. Eigmüller, A. Erikson, B. Gänsicke, E. Gillen, M. Goad, J. Jenkins, J. McCormac, M. Moyano, L. Nielsen, D. Pollacco, K. Poppenhaeger, D. Queloz, H. Rauer, L. Raynard, Alexis M. S. Smith, S. Udry, J. Vines, C. Watson, R. West   +38 more
semanticscholar   +1 more source

A measurement of the wind speed on a brown dwarf

Science, 2020
High winds in an extrasolar atmosphere Brown dwarfs are objects intermediate in mass between large planets and small stars, and their atmospheres share many characteristics with gas giant planets.
K. Allers, J. Vos, Beth A. Biller, P. K. G. Williams   +3 more
semanticscholar   +1 more source

Greening of the brown-dwarf desert [PDF]

Astronomy & Astrophysics, 2019
Context. Although more than 2000 brown dwarfs have been detected to date, mainly from direct imaging, their characterisation is difficult due to their faintness and model-dependent results.
C. Persson, S. Csizmadia, A. Mustill, M. Fridlund, A. Hatzes, G. Nowak, I. Georgieva, D. Gandolfi, M. Davies, J. Livingston, E. Pallé, P. Montañés Rodríguez, M. Endl, T. Hirano, J. Prieto-Arranz, J. Korth, S. Grziwa, M. Esposito, S. Albrecht, Marshall C. Johnson, O. Barrag'an, H. Parviainen, V. Van Eylen, Roi Alonso Sobrino, P. Beck, J. Cabrera, I. Carleo, W. Cochran, F. Dai, H. Deeg, J. D. de Leon, P. Eigmüller, A. Erikson, A. Fukui, L. González-Cuesta, E. Guenther, D. Hidalgo, M. Hjorth, P. Kabáth, E. Knudstrup, N. Kusakabe, K. Lam, M. Lund, R. Luque, S. Mathur, F. Murgas, N. Narita, D. Nespral, P. Niraula, A. Olofsson, M. Pätzold, H. Rauer, S. Redfield, I. Ribas, M. Skarka, Alexis M. S. Smith, J. Šubjak, M. Tamura   +57 more
semanticscholar   +1 more source

Brown Dwarf Atmospheres as the Potentially Most Detectable and Abundant Sites for Life [PDF]

Astrophysical Journal, 2019
We show that the total habitable volume in the atmospheres of cool brown dwarfs with effective temperatures of ∼250–350 K is possibly larger by 2 orders of magnitude than that of Earth-like planets.
M. Lingam, A. Loeb
semanticscholar   +1 more source

The abundance of brown dwarfs [PDF]

Monthly Notices of the Royal Astronomical Society, 1999
The amount of mass contained in low-mass objects is investigated anew. Instead of using a mass-luminosity relation to convert a luminosity function to a mass function, I predict the mass-luminosity relation from assumed mass functions and the luminosity functions of Jahreiss & Wielen (1997) and Gould et al (1997).
openaire   +6 more sources