منابع مشابه
ASTRONOMY AND ASTROPHYSICS Circumstellar disk variations around β Pictoris
We present high resolution spectral observations of the absorption lines of Ca II and Na I associated with the circumstellar disk surrounding the starβ Pictoris. The observations were taken over a four night period in January 1996 and reveal substantial profile variability between successive nights. High velocity absorption features at velocities of +58 km s−1 were observed in the Ca II data, b...
متن کاملThe Dust and Gas around Pictoris
We have obtained Spitzer IRS 5.5Y35 m spectroscopy of the debris disk around Pictoris. In addition to the 10 m silicate emission feature originally observed from the ground, we also detect the crystalline silicate emission bands at 28 and 33.5 m. This is the first time that the silicate bands at wavelengths longer than 10 mhave ever been seen in the Pictoris disk. The observed dust emission is ...
متن کاملDeep near-infrared interferometric search for low-mass companions around β Pictoris*
Aims. We search for low-mass companions in the innermost region (<300 mas, i.e., 6 AU) of the β Pic planetary system. Methods. We obtained interferometric closure phase measurements in the K-band with the VLTI/AMBER instrument used in its medium spectral resolution mode. Fringe stabilization was provided by the FINITO fringe tracker. Results. In a search region of between 2 and 60 mas in radius...
متن کاملThe Planet around 51 Pegasi
Doppler measurements of 51 Pegasi have been made from 1995 October through 1996 August, with a precision of 5 m s~1. We Ðnd a period of 4.231 days, a velocity amplitude of 56^ 1 m s~1, and a velocity curve that is essentially sinusoidal, all in excellent agreement with Mayor & Queloz. The only viable interpretation is a companion having minimum mass, m sin i \ 0.45 in a circular orbit of MJupit...
متن کاملA search for β Pictoris - like Ca II circumstellar gas around Ursa Major Stream stars ?
We carried out an optical spectroscopic survey of twenty one stars to search for Ca ii circumstellar gas at the stellar velocity similar to that found in the β Pictoris disk. The surveyed stars are A-type stars with large v sin i in the Ursa Major stellar kinematic group. No evidence of circumstellar gas was found around any of the stars. This result suggests that β Pictoris either is a very pe...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2010
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921311019946