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Evidence for localized onset of episodic mass loss in Mira
G. Perrin, S. T. Ridgway, S. Lacour +9
We report Multi-telescope interferometric measurements taken with the Interferometric Optical Telescope Array (IOTA) to provide imagery of the LPV Mira in the H-band. This waveleng…
Structure of Herbig AeBe disks at the milliarcsecond scale A statistical survey in the H band using PIONIER-VLTI
B. Lazareff, J. -P. Berger, J. Kluska +26
Context. It is now generally accepted that the near-infrared excess of Herbig AeBe stars originates in the dust of a circumstellar disk. Aims. The aims of this article are to infer…
Sculpting the disk around T Cha: an interferometric view
Johan Olofsson, Myriam Benisty, Jean-Baptiste Le Bouquin +13
(Abridged) Circumstellar disks are believed to be the birthplace of planets and are expected to dissipate on a timescale of a few Myr. The processes responsible for the removal of…
Hot circumstellar material resolved around beta Pic with VLTI/PIONIER
D. Defrère, J. Lebreton, J. -B. Le Bouquin +11
We aim at resolving the circumstellar environment around beta Pic in the near-infrared in order to study the inner planetary system (< 200 mas, i.e., ~4 AU). Precise interferometri…
First Keck Nulling Observations of a Young Stellar Object: Probing the Circumstellar Environment of the Herbig Ae star MWC 325
S. Ragland, K. Ohnaka, L. Hillenbrand +8
We present the first N-band nulling plus K- and L-band V2 observations of a young stellar object, MWC325, taken with the 85 m baseline Keck Interferometer. The Keck nuller was desi…
Exo--Zodiacal Dust Levels for Nearby Main Sequence Stars
R. Millan-Gabet, E. Serabyn, B. Mennesson +11
The Keck Interferometer Nuller (KIN) was used to survey 25 nearby main sequence stars in the mid-infrared, in order to assess the prevalence of warm circumstellar (exozodiacal) dus…
Imaging the spotty surface of Betelgeuse in the H band
X. Haubois, G. Perrin, S. Lacour +9
This paper reports on H-band interferometric observations of Betelgeuse made at the three-telescope interferometer IOTA. We image Betelgeuse and its asymmetries to understand the s…
The Pulsation of Chi Cygni Imaged by Optical Interferometry; a Novel Technique to Derive Distance and Mass of Mira Stars
S. Lacour, E. Thiébaut, G. Perrin +13
We present infrared interferometric imaging of the S-type Mira star Chi Cygni. The object was observed at four different epochs in 2005-2006 with the IOTA optical interferometer (H…
51 Ophiuchus: A Possible Beta Pictoris Analog Measured with the Keck Interferometer Nuller
Christopher C. Stark, Marc J. Kuchner, Wesley A. Traub +6
We present observations of the 51 Ophiuchi circumstellar disk made with the Keck interferometer operating in nulling mode at N-band. We model these data simultaneously with VLTI-MI…
First L-band Interferometric Observations of a Young Stellar Object: Probing the Circumstellar Environment of MWC 419
S. Ragland, R. L. Akeson, T. Armandroff +7
We present spatially-resolved K- and L-band spectra (at spectral resolution R = 230 and R = 60, respectively) of MWC 419, a Herbig Ae/Be star. The data were obtained simultaneously…