Results 61 to 70 of about 111,632 (351)

Evidence for accretion in a nearby, young brown dwarf

, 2009
We report on the discovery of the young, nearby, brown dwarf 2MASS J0041353$-$562112. The object has a spectral type of M7.5, it shows Li absorption and signatures of accretion, which implies that it still has a disk and suggests an age below 10 Myr. The
Aarnio, Ansgar Reiners, Baraffe, Burrows, Faherty, Golimowski, Herczeg, Jayawardhana, Jayawardhana, Lowrance, Mamajek, McGehee, Millan-Gabet, Mohanty, Mohanty, Muzerolle, Muzerolle, Muzerolle, Padoan, Phan Bao, Reiners, Reipurth, Schmidt, Scholz, Torres, Whelan   +25 more
core   +1 more source

A Panchromatic View of Brown Dwarf Aurorae [PDF]

, 2017
Stellar coronal activity has been shown to persist into the low-mass star regime, down to late M-dwarf spectral types. However, there is now an accumulation of evidence suggesting that at the end of the main sequence there is a transition in the nature ...
Hallinan, Gregg, Kao, Melodie M., Pineda, J. Sebastian   +2 more
core   +3 more sources

Description of the skull, braincase, and dentition of Moschognathus whaitsi (Dinocephalia, Tapinocephalia), and its palaeobiological and behavioral implications

The Anatomical Record, EarlyView.
Abstract A subadult Moschognathus whaitsi from the Eastern Cape Province, South Africa, was scanned using synchrotron radiation X‐ray computed tomography (SRXCT). Its subadult state allowed the cranial bones and teeth to be identified and individually reconstructed in 3D.
Tristen Lafferty, Luke A. Norton, Aliénor Duhamel, Julien Benoit   +3 more
wiley   +1 more source

Long-term 4.6 μm Variability in Brown Dwarfs and a New Technique for Identifying Brown Dwarf Binary Candidates

The Astronomical Journal, 2023
Using a sample of 361 nearby brown dwarfs, we have searched for 4.6 μ m variability, indicative of large-scale rotational modulations or large-scale, long-term changes on timescales of over 10 yr.
Hunter Brooks, J. Davy Kirkpatrick, Aaron M. Meisner, Christopher R. Gelino, Daniella C. Bardalez Gagliuffi, Federico Marocco, Adam C. Schneider, Jacqueline K. Faherty, S. L. Casewell, Yadukrishna Raghu, Marc J. Kuchner, The Backyard Worlds: Planet 9 Collaboration   +11 more
doaj   +1 more source

A possible dividing line between massive planets and brown-dwarf companions

, 2010
Brown dwarfs are intermediate objects between planets and stars. The lower end of the brown-dwarf mass range overlaps with the one of massive planets and therefore the distinction between planets and brown-dwarf companions may require to trace the ...
Correia, Damien Ségransan, Didier Queloz, Halbwachs, Johannes Sahlmann, Leconte, Lindegren, Sahlmann, Santos, Sozzetti, Stéphane Udry, Ségransan, Udry, Udry   +13 more
core   +1 more source

The Extreme Microlensing Event OGLE-2007-BLG-224: Terrestrial Parallax Observation of a Thick-Disk Brown Dwarf [PDF]

, 2009
Parallax is the most fundamental technique to measure distances to astronomical objects. Although terrestrial parallax was pioneered over 2000 years ago by Hipparchus (ca.
A. Allan, A. Fukui, A. Gould, A. Korpela, A. Udalski, A. Williams, Alves, An, B. Monard, B. S. Gaudi, B.-G. Park, Bennett, Burgasser, Burgasser, Burgasser, Burrows, C. Coutures, C. H. Ling, C. Han, C. Mottram, C. S. Botzler, C. Snodgrass, C.-U. Lee, D. J. Sullivan, D. L. DePoy, D. M. Bramich, D. P. Bennett, Dong, Dong, E. Kerins, F. Abe, Faherty, Fukui, G. Pietrzyński, G. W. Christie, Gaudi, Gould, Gould, Gould, Gould, Gould, Gould, Gould, H. Calitz, Han, Hardy, Hipparchus of Nicaea, Holz, I. A. Bond, I. A. Steele, I. Soszyński, J. B. Hearnshaw, J. Caldwell, J. McCormick, J. P. Beaulieu, Jaroszynski, K. Furusawa, K. Horne, K. Kamiya, K. Masuda, K. Ohnishi, K. Sahu, K. Ulaczyk, L. Skuljan, M. Albrow, M. Dominik, M. F. Bode, M. J. Burgdorf, M. K. Szymański, M. Kubiak, M. Nagaya, Metchev, N. Miyake, N. Rattenbury, O. Szewczyk, P. C. M. Yock, P. Fouque, P. J. Tristram, P. M. Kilmartin, Poindexter, R. Martin, R. Street, R. W. Pogge, S. N. Fraser, Skruttskie, Snodgrass, Subo Dong, T. Natusch, T. Okumura, T. Sako, T. Sumi, To. Saito, Udalski, Udalski, W. Allen, W. L. Sweatman, W. Lin, Y. C. Perrott, Y. Itow, Y. Matsubara, Y. Muraki, Y. Tsapras, Yoo, Ł. Wyrzykowski   +103 more
core   +5 more sources

Searches for brown dwarfs [PDF]

International Astronomical Union Colloquium, 1994
AbstractThis review attempts a brief summary of the numerous and diverse searches for the so-called brown dwarfs, substellar objects having masses between giant planets and the lowest mass M dwarf stars.
openaire   +1 more source

Rethinking brachycephaly: Anatomical implications and health considerations in lagomorphs

The Anatomical Record, EarlyView.
Abstract Brachycephaly in domestic rabbits is increasingly perceived by welfare organizations as associated with significant health complications, particularly oral pathologies. Despite this perception, comparative anatomical research into rabbit brachycephaly is limited compared to that of dogs and cats, compelling an in‐depth examination of its ...
Helaina Cressy, Alice Nishigaki, Matthew C. Gage, Renato L. Previdelli   +3 more
wiley   +1 more source

The Minimum Jeans Mass, Brown Dwarf Companion IMF, and Predictions for Detection of Y-type Dwarfs

, 2008
Cool L- and T-type objects were discovered first as companions to stars in 1988 and 1995, respectively. A certain example of the yet cooler Y-type spectral class (Teff
Allen, Allen, B. Zuckerman, Baraffe, Barnes, Bate, Becklin, Bessell, Boyd, Burgasser, Burgasser, Burgasser, Burrows, Chauvin, Chauvin, Chauvin, Chauvin, Chen, Close, Delorme, Els, Farihi, Fischer, Gaidos, Geballe, Geballe, Gizis, Golimowski, I. Song, Itoh, Kasper, Kasper, Kirkpatrick, Kirkpatrick, Kirkpatrick, Konopacky, Lafrenière, Lane, Liu, Low, Lowrance, Lowrance, Luhman, Luhman, Marcy, Marois, Masciadri, McElwain, McElwain, Metchev, Metchev, Mohanty, Mugrauer, Nakajima, Neuhauser, Nielsen, Nordström, Norman, Padoan, Padoan, Potter, Rafikov, Rebolo, Rice, Scholz, Seifahrt, Song, Song, Tokovinin, Warren, White, Whitworth, Wilson, Zuckerman, Zuckerman   +74 more
core   +1 more source

Confirmation of a Non‐Transiting Planet in the Habitable Zone of the Nearby M Dwarf L 98‐59

Astronomische Nachrichten, EarlyView.
ABSTRACT Only 40 exoplanetary systems with five or more planets are currently known. These systems are crucial for our understanding of planet formation and planet‐planet interaction. The M dwarf L 98‐59 has previously been found to show evidence of five planets, three of which are transiting.
Paul I. Schwarz, Stefan Dreizler, René Heller   +2 more
wiley   +1 more source