Reaching sub-milimag photometric precision on Beta Pictoris with a nanosat: the PicSat mission

M. Nowak; S. Lacour; V. Lapeyrère; L. David; A. Crouzier; C. Dufoing; H. Faiz; T. Lemoult; P. Trébuchet

doi:10.1117/12.2232508

29 July 2016 Reaching sub-milimag photometric precision on Beta Pictoris with a nanosat: the PicSat mission

M. Nowak, S. Lacour, V. Lapeyrère, L. David, A. Crouzier, C. Dufoing, H. Faiz, T. Lemoult, P. Trébuchet

Proceedings Volume 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave; 99044L (2016) https://doi.org/10.1117/12.2232508
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

PicSat is a nanosatellite currently being developed to observe the transit of the giant planet β Pictoris, expected some time between July 2017 and June 2018. The mission is based on a Cubesat architecture, with a small but ambitious 2 kg opto-mechanical payload specifically designed for high precision photometry. The satellite will be launched in early 2017, probably on a 600 km Sun synchronous orbit. The main objective of the mission is the constant monitoring of the brightness of Pic at an unprecedented combination of reliability and precision (200 ppm per hour, with interruptions of at most 30 minutes) to finely characterize the transiting exoplanet and detect exocomets in the Pictoris system. To achieve this difficult objective, the payload is designed with a 3.5 cm effective aperture telescope which injects the light in a single-mode optical fiber linked to an avalanche photodioode. A two-axis piezoelectric actuation system, driven by a tailor-made feedback loop control algorithm, is used to lock the fiber on the center of the star in the focal plane. These actuators complement the attitude determination and control system of the satellite to maintain the sub-arcsecond pointing accuracy required to reach the excellent level of photometric precision. Overall, the mission raises multiple very difficult challenges: high temperature stability of the avalanche detector (achieved with a thermoelectric colling device), high pointing accuracy and stability, and short timeframe for the development.

Citation Download Citation

M. Nowak, S. Lacour, V. Lapeyrère, L. David, A. Crouzier, C. Dufoing, H. Faiz, T. Lemoult, and P. Trébuchet "Reaching sub-milimag photometric precision on Beta Pictoris with a nanosat: the PicSat mission", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99044L (29 July 2016); https://doi.org/10.1117/12.2232508

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