Making high-accuracy null depth measurements for the LBTI exozodi survey

Bertrand Mennesson; Denis Defrère; Matthias Nowak; Philip Hinz; Rafael Millan-Gabet; Olivier Absil; Vanessa Bailey; Geoffrey Bryden; William Danchi; Grant M. Kennedy; Lindsay Marion; Aki Roberge; Eugene Serabyn; Andy J. Skemer; Karl Stapelfeldt; Alycia J. Weinberger; Mark Wyatt

doi:10.1117/12.2231839

4 August 2016 Making high-accuracy null depth measurements for the LBTI exozodi survey

Bertrand Mennesson, Denis Defrère, Matthias Nowak, Philip Hinz, Rafael Millan-Gabet, Olivier Absil, Vanessa Bailey, Geoffrey Bryden, William Danchi, Grant M. Kennedy, Lindsay Marion, Aki Roberge, Eugene Serabyn, Andy J. Skemer, Karl Stapelfeldt, Alycia J. Weinberger, Mark Wyatt

Author Affiliations +

Proceedings Volume 9907, Optical and Infrared Interferometry and Imaging V; 99070X (2016) https://doi.org/10.1117/12.2231839
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The characterization of exozodiacal light emission is both important for the understanding of planetary systems evolution and for the preparation of future space missions aiming to characterize low mass planets in the habitable zone of nearby main sequence stars. The Large Binocular Telescope Interferometer (LBTI) exozodi survey aims at providing a ten-fold improvement over current state of the art, measuring dust emission levels down to a typical accuracy of ~12 zodis per star, for a representative ensemble of ~30+ high priority targets. Such measurements promise to yield a final accuracy of about 2 zodis on the median exozodi level of the targets sample. Reaching a 1 σ measurement uncertainty of 12 zodis per star corresponds to measuring interferometric cancellation (“null”) levels, i.e visibilities at the few 100 ppm uncertainty level. We discuss here the challenges posed by making such high accuracy mid-infrared visibility measurements from the ground and present the methodology we developed for achieving current best levels of 500 ppm or so. We also discuss current limitations and plans for enhanced exozodi observations over the next few years at LBTI.

Citation Download Citation

Bertrand Mennesson, Denis Defrère, Matthias Nowak, Philip Hinz, Rafael Millan-Gabet, Olivier Absil, Vanessa Bailey, Geoffrey Bryden, William Danchi, Grant M. Kennedy, Lindsay Marion, Aki Roberge, Eugene Serabyn, Andy J. Skemer, Karl Stapelfeldt, Alycia J. Weinberger, and Mark Wyatt "Making high-accuracy null depth measurements for the LBTI exozodi survey", Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99070X (4 August 2016); https://doi.org/10.1117/12.2231839

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