BRITE Constellation: Data processing and photometry

A. Popowicz, A. Pigulski, K. Bernacki, R. Kuschnig, H. Pablo, T. Ramiaramanantsoa, E. Zocłońska, D. Baade, G. Handler, A. F.J. Moffat, G. A. Wade, C. Neiner, S. M. Rucinski, W. W. Weiss, O. Koudelka, P. Orleański, A. Schwarzenberg-Czerny, K. Zwintz

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

Context. The BRIght Target Explorer (BRITE) mission is a pioneering space project aimed at the long-term photometric monitoring of the brightest stars in the sky by means of a constellation of nanosatellites. Its main advantage is high photometric accuracy and time coverage which are inaccessible from the ground. Its main drawback is the lack of cooling of the CCD detectors and the absence of good shielding that would protect them from energetic particles. Aims. The main aim of this paper is the presentation of procedures used to obtain high-precision photometry from a series of images acquired by the BRITE satellites in two modes of observing, stare and chopping. The other aim is a comparison of the photometry obtained with two different pipelines and a comparison of the real scatter with expectations. Methods. We developed two pipelines corresponding to the two modes of observing. They are based on aperture photometry with a constant aperture, circular for stare mode of observing and thresholded for chopping mode. Impulsive noise is a serious problem for observations made in the stare mode of observing and therefore in the pipeline developed for observations made in this mode, hot pixels are replaced using the information from shifted images in a series obtained during a single orbit of a satellite. In the other pipeline, the hot pixel replacement is not required because the photometry is made in difference images. Results. The assessment of the performance of both pipelines is presented. It is based on two comparisons, which use data from six runs of the UniBRITE satellite: (i) comparison of photometry obtained by both pipelines on the same data, which were partly affected by charge transfer inefficiency (CTI), (ii) comparison of real scatter with theoretical expectations. It is shown that for CTI-affected observations, the chopping pipeline provides much better photometry than the other pipeline. For other observations, the results are comparable only for data obtained shortly after switching to chopping mode. Starting from about 2.5 years in orbit, the chopping mode of observing provides significantly better photometry for UniBRITE data than the stare mode. Conclusions. This paper shows that high-precision space photometry with low-cost nanosatellites is achievable. The proposed methods, used to obtain photometry from images affected by high impulsive noise, can be applied to data from other space missions or even to data acquired from ground-based observations.

Spracheenglisch
AufsatznummerA26
FachzeitschriftAstronomy & Astrophysics
Jahrgang605
DOIs
StatusVeröffentlicht - 1 Sep 2017

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constellations
photometry
nanosatellites
pixel
apertures
pixels
charge transfer
Explorer satellites
orbits
space missions
energetic particles
shielding
energetics
sky
replacement
charge coupled devices
comparison
cooling
stars
monitoring

Schlagwörter

    ASJC Scopus subject areas

    • !!Astronomy and Astrophysics
    • !!Space and Planetary Science

    Dies zitieren

    Popowicz, A., Pigulski, A., Bernacki, K., Kuschnig, R., Pablo, H., Ramiaramanantsoa, T., ... Zwintz, K. (2017). BRITE Constellation: Data processing and photometry. Astronomy & Astrophysics, 605, [A26]. https://doi.org/10.1051/0004-6361/201730806

    BRITE Constellation : Data processing and photometry. / Popowicz, A.; Pigulski, A.; Bernacki, K.; Kuschnig, R.; Pablo, H.; Ramiaramanantsoa, T.; Zocłońska, E.; Baade, D.; Handler, G.; Moffat, A. F.J.; Wade, G. A.; Neiner, C.; Rucinski, S. M.; Weiss, W. W.; Koudelka, O.; Orleański, P.; Schwarzenberg-Czerny, A.; Zwintz, K.

    in: Astronomy & Astrophysics, Jahrgang 605, A26, 01.09.2017.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

    Popowicz, A, Pigulski, A, Bernacki, K, Kuschnig, R, Pablo, H, Ramiaramanantsoa, T, Zocłońska, E, Baade, D, Handler, G, Moffat, AFJ, Wade, GA, Neiner, C, Rucinski, SM, Weiss, WW, Koudelka, O, Orleański, P, Schwarzenberg-Czerny, A & Zwintz, K 2017, 'BRITE Constellation: Data processing and photometry', Astronomy & Astrophysics, Jg. 605, A26. https://doi.org/10.1051/0004-6361/201730806
    Popowicz A, Pigulski A, Bernacki K, Kuschnig R, Pablo H, Ramiaramanantsoa T et al. BRITE Constellation: Data processing and photometry. Astronomy & Astrophysics. 2017 Sep 1;605. A26. https://doi.org/10.1051/0004-6361/201730806
    Popowicz, A. ; Pigulski, A. ; Bernacki, K. ; Kuschnig, R. ; Pablo, H. ; Ramiaramanantsoa, T. ; Zocłońska, E. ; Baade, D. ; Handler, G. ; Moffat, A. F.J. ; Wade, G. A. ; Neiner, C. ; Rucinski, S. M. ; Weiss, W. W. ; Koudelka, O. ; Orleański, P. ; Schwarzenberg-Czerny, A. ; Zwintz, K. / BRITE Constellation : Data processing and photometry. in: Astronomy & Astrophysics. 2017 ; Jahrgang 605.
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    T2 - Astronomy & Astrophysics

    AU - Popowicz, A.

    AU - Pigulski, A.

    AU - Bernacki, K.

    AU - Kuschnig, R.

    AU - Pablo, H.

    AU - Ramiaramanantsoa, T.

    AU - Zocłońska, E.

    AU - Baade, D.

    AU - Handler, G.

    AU - Moffat, A. F.J.

    AU - Wade, G. A.

    AU - Neiner, C.

    AU - Rucinski, S. M.

    AU - Weiss, W. W.

    AU - Koudelka, O.

    AU - Orleański, P.

    AU - Schwarzenberg-Czerny, A.

    AU - Zwintz, K.

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    KW - Techniques: image processing

    KW - Techniques: photometric

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