Exploring 5-40 AU scales around AB Aurigae with an upgraded Palomar Fiber Nuller

Jonas Kühn; Bertrand Mennesson; Kurt Liewer; Stefan Martin; Frank Loya; Rafael Millan-Gabet; Eugene Serabyn

doi:10.1117/12.2056798

24 July 2014 Exploring 5-40 AU scales around AB Aurigae with an upgraded Palomar Fiber Nuller

Jonas Kühn, Bertrand Mennesson, Kurt Liewer, Stefan Martin, Frank Loya, Rafael Millan-Gabet, Eugene Serabyn

Proceedings Volume 9146, Optical and Infrared Interferometry IV; 914606 (2014) https://doi.org/10.1117/12.2056798
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

With a null precision of a few 10^-4 at all azimuth angles inside a field-of-view extending from 35 to 275 mas, the Palomar Fiber Nuller (PFN) is able to explore angular scales intermediate between those accessed by coronagraphic imaging and by long baseline interferometry. We first briefly summarize the recent performance improvements of the PFN (sensitivity, azimuthal coverage, duty cycle efficiency on-sky) over the 2011-2014 time period. Then we report on recent K-band observations of the young pre-main sequence star AB Aurigae obtained with the PFN. It is shown that a mean astrophysical null of 1.52% was detected around AB Aur at all probed azimuthal angles, and this inside a field-of-view corresponding to projected separations between 5 and 40 AU. In addition, we also report a slight ±0.2% modulation in addition to this average null level. The isotropic astrophysical null is indicative of circumstellar emission dominated by an azimuthally extended source, possibly a halo or one or more rings of dust. The modest azimuthal variation may be explained by some skewness or anisotropy of the spatially-extended source, e.g. with an elliptical or spiral geometry, or clumping, but it could also be due to the presence of a point-source located at a separation of ~120 mas (17AU) and carrying ~6*10-3 of the stellar flux.

Citation Download Citation

Jonas Kühn, Bertrand Mennesson, Kurt Liewer, Stefan Martin, Frank Loya, Rafael Millan-Gabet, and Eugene Serabyn "Exploring 5-40 AU scales around AB Aurigae with an upgraded Palomar Fiber Nuller", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 914606 (24 July 2014); https://doi.org/10.1117/12.2056798

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available