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We present observations of a circumstellar disk that is inclined close to edge-on around a young brown dwarf in the Taurus star-forming region. Using data obtained with SpeX at the NASA Infrared Telescope Facility, we find that the slope of…

We study the inner region of the circumstellar disk around the TTauri star RY Tau. Our aim is to find a physical description satisfying the available interferometric data, obtained with the mid-infrared interferometric instrument at the…

Astrophysics · Physics 2009-11-13 A. A. Schegerer , S. Wolf , Th. Ratzka , Ch. Leinert

The combination of mid-infrared and recent submm/mm measurements allows us to set up the first comprehensive spectral energy distribution (SED) of the circumstellar material around a young Brown Dwarf. Simple arguments suggest that the dust…

Astrophysics · Physics 2009-11-07 I. Pascucci , D. Apai , Th. Henning , C. P. Dullemond

Recent sub-millimetric observations at the Plateau de Bure interferometer evidenced a cavity at ~ 46 AU in radius into the proto-planetary disk around the T Tauri star LkCa15 (V1079 Tau), located in the Taurus molecular cloud. Additional…

Earth and Planetary Astrophysics · Physics 2015-05-18 M. Bonavita , G. Chauvin , A. Boccaletti , V. Pietu , P. Baudoz , J. L. Beuzit , A. Dutrey , S. Guilloteau , A. M. Lagrange , D. Mouillet , G. Niccolini

We seek to establish the presence and properties of gas in the circumstellar disk orbiting T Cha, a nearby (d~110 pc), relatively evolved (age ~5-7 Myr) yet actively accreting 1.5 Msun T Tauri star. We used the APEX 12 m radiotelescope to…

Solar and Stellar Astrophysics · Physics 2015-06-17 G. G. Sacco , J. H. Kastner , T. Forveille , D. Principe , R. Montez , B. Zuckerman , P. Hily-Blant

We present SCUBA-2 850um observations for 7 very low mass stars (VLMS) and brown dwarfs (BDs): 3 in Taurus, 4 in the TWA, and all classical T Tauri (cTT) analogs. We detect 2 of the 3 Taurus disks, but none of the TWA ones. Our 3sigma…

We present new spatially resolved 1.3 mm imaging with CARMA of the GV Tau system. GV Tau is a Class I binary protostar system in the Taurus Molecular Cloud, the components of which are separated by 1.2". Each protostar is surrounded by a…

Solar and Stellar Astrophysics · Physics 2015-06-19 Patrick Sheehan , Josh Eisner

We present a study of 15 new brown dwarfs belonging to the $\sim7$ Myr old 25 Orionis group and Orion OB1a sub-association with spectral types between M6 and M9 and estimated masses between $\sim0.07$M$_\odot$ and $\sim0.01$ M$_\odot$. By…

Recent observations of the Rho Ophiuchi cluster with the Herschel Space Observatory allow us to probe the spectral energy distribution (SED) of the brown dwarf population in the far-IR, where the disk emission peaks. We performed aperture…

Astrophysics of Galaxies · Physics 2015-06-17 C. Alves de Oliveira , P. Ábrahám , G. Marton , C. Pinte , Cs. Kiss , M. Kun , Á. Kóspál , Ph. André , V. Könyves

We present three-dimensional Monte Carlo radiative transfer models of a very young (<10^5 years old) low mass (50 Msun) stellar cluster containing 23 stars and 27 brown dwarfs. The models use the density and the stellar mass distributions…

Astrophysics · Physics 2009-11-10 Ryuichi Kurosawa , Tim J. Harries , Matthew R. Bate , Neil H. Symington

We present the results of ALMA band 7 observations of dust and CO gas in the disks around 7 objects with spectral types ranging between M5.5 and M7.5 in Upper Scorpius OB1, and one M3 star in Ophiuchus. We detect unresolved continuum…

Solar and Stellar Astrophysics · Physics 2016-09-09 G. van der Plas , F. Menard , K. Ward-Duong , J. Bulger , P. M Harvey , C. Pinte , J. Patience , A. Hales , S. Casassus

We present high spatial resolution (< 0.3" = 40$ AU) Submillimeter Array observations of the 865 micron continuum emission from the circumstellar disk around the young star DoAr 25. Despite its bright millimeter emission, this source…

Astrophysics · Physics 2009-11-13 Sean M. Andrews , A. M. Hughes , D. J. Wilner , Chunhua Qi

We present new ALMA observations of CO $J$=2$-$1 line emission from the DQ Tau circumbinary disk. These data are used to tomographically reconstruct the Keplerian disk velocity field in a forward-modeling inference framework, and thereby…

Solar and Stellar Astrophysics · Physics 2016-03-09 Ian Czekala , S. M. Andrews , G. Torres , E. L. N. Jensen , K. G. Stassun , D. J. Wilner , D. W. Latham

We present new high spatial resolution (<~ 0.1") 1-5 micron adaptive optics images, interferometric 1.3 mm continuum and 12CO 2-1 maps, and 350 micron, 2.8 and 3.3 mm fluxes measurements of the HV Tau system. Our adaptive optics images…

We present a multi-wavelength analysis of the dust of BP Tau's protoplanetary disk. We use new optical spectra of BP Tau, taken with the Magellan/MIKE spectrograph in tandem with archival UV and mid-infrared observations. We use the…

Aims. The brown dwarf (BD) formation process has not yet been completely understood. To shed more light on the differences and similarities between star and BD formation processes, we study and compare the disk fraction among both kinds of…

We report the discovery of a dwarf protoplanetary disk around the star XZ Tau B that shows all the features of a classical transitional disk but on a much smaller scale. The disk has been imaged with the Atacama Large…

We present high resolution millimeter continuum and CO line observations for the circumbinary disk around V892 Tau to constrain the stellar and disk properties. The total mass of the two near-equal-mass A stars is estimated to be…

Understanding the evolution and dissipation of protoplanetary disks are crucial in star and planet formation studies. We report the protoplanetary disk population in the nearby young $\sigma$ Orionis cluster (d$\sim$408 pc; age$\sim$1.8…

Solar and Stellar Astrophysics · Physics 2023-05-30 Belinda Damian , Jessy Jose , Beth Biller , KT Paul

We present new far-ultraviolet observations of the young M8 brown dwarf 2MASS J12073346-3932539, which is surrounded by an accretion disk. The data were obtained using the Hubble Space Telescope-Cosmic Origins Spectrograph. Moderate…

Solar and Stellar Astrophysics · Physics 2015-05-18 Kevin France , Jeffrey L. Linksy , Alexander Brown , Cynthia S. Froning , Stephane Beland