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

Kühn, Jonas and Mennesson, Bertrand and Liewer, Kurt and Martin, Stefan and Loya, Frank and Millan-Gabet, Rafael and Serabyn, Eugene (2014) Exploring 5-40 AU scales around AB Aurigae with an upgraded Palomar Fiber Nuller. In: Optical and Infrared Interferometry IV. Proceedings of SPIE. No.9146. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 914606. ISBN 978-0-8194-9614-0. http://resolver.caltech.edu/CaltechAUTHORS:20150605-081545655

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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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.2056798 DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1891897PublisherArticle
ORCID:
AuthorORCID
Millan-Gabet, Rafael0000-0003-0447-5866
Additional Information:© 2014 SPIE. This work was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. The data presented are based on observations obtained at the Hale Telescope, Palomar Observatory, as part of a continuing collaboration between Caltech, NASA/JPL, and Cornell University. We particularly thank the Palomar Observatory and p3k AO staff for their assistance in mounting the PFN and conducting the observations at the Hale Telescope. JK is supported by a Swiss National Science Foundation Advanced Postdoc Mobility fellowship (PA00P2136416).
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
Swiss National Science Foundation (SNSF)PA00P2136416
Subject Keywords:Nulling interferometer; Interferometry; AB Aurigae; Herbig star; Planet formation; Protoplanetary disk
Record Number:CaltechAUTHORS:20150605-081545655
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150605-081545655
Official Citation:Jonas Kühn ; Bertrand Mennesson ; Kurt Liewer ; Stefan Martin ; Frank Loya, et al. " Exploring 5-40 AU scales around AB Aurigae with an upgraded Palomar Fiber Nuller ", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 914606 (July 24, 2014); doi:10.1117/12.2056798
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58029
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Jun 2015 18:19
Last Modified:19 Apr 2017 16:35

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