Journal ArticleDOI
Optimal Image Subtraction Method: Summary Derivations, Applications, and Publicly Shared Application Using IDL
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TLDR
Computer algorithms for the OIS method were developed, written using the Interactive Data Language (IDL) and applications demonstrating these algorithms are presented, and a complete description of the Gaussian components basis vectors used by Alard & Lupton to construct the convolution kernel is presented.Abstract:
To detect objects that vary in brightness or spatial coordinates over time, C. Alard and R. H. Lupton in 1998 proposed an "optimal image subtraction" (OIS) method that constructs a convolution kernel from a set of matching stars distributed across the two images to be subtracted. Using multivariable least squares, the kernel is derived and can be designed to vary by pixel coordinates across the convolved image. Local effects in the optics, including aberrations or other spatially sensitive perturbations to a perfect image, can be mitigated. This paper presents the specific systems of equations that originate from the OIS method. Also included is a complete description of the Gaussian components basis vectors used by Alard & Lupton to construct the convolution kernel. An alternative set of basis vectors, called the delta function basis, is also described. Important issues are addressed, including the selection of the matching stars, differential background correction, constant photometric flux, contaminated pixel masking, and alignment at the subpixel level. Computer algorithms for the OIS method were developed, written using the Interactive Data Language (IDL), and applications demonstrating these algorithms are presented.read more
Citations
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Journal ArticleDOI
Difference image analysis: extension to a spatially varying photometric scale factor and other considerations
D. M. Bramich,Keith Horne,Michael D. Albrow,Yiannis Tsapras,Colin Snodgrass,Rachel Street,M. Hundertmark,N. Kains,A. Arellano Ferro,R. Figuera Jaimes,Sunetra Giridhar +10 more
TL;DR: The new concept of a spatially varying photometric scale factor is introduced which will be important for DIA applied to wide-field imaging data in order to adapt to transparency and airmass variations across the field-of-view.
Journal ArticleDOI
Optical observations of LIGO source GW 170817 by the Antarctic Survey Telescopes at Dome A, Antarctica
Lei Hu,Lei Hu,Xue-Feng Wu,Xue-Feng Wu,Igor Andreoni,Igor Andreoni,Igor Andreoni,Michael C. B. Ashley,Jeff Cooke,Jeff Cooke,Xiangqun Cui,Fujia Du,Zi-Gao Dai,Bozhong Gu,Yi Hu,Haiping Lu,Xiaoyan Li,Zhengyang Li,En-Si Liang,Liang-Duan Liu,Bin Ma,Zhaohui Shang,Zhaohui Shang,Tianrui Sun,Tianrui Sun,Nicholas B. Suntzeff,Charling Tao,Charling Tao,Syed Uddin,Syed Uddin,Lifan Wang,Lifan Wang,Xiaofeng Wang,Haikun Wen,Di Xiao,Jin Xu,Ji Yang,Shihai Yang,Xiangyan Yuan,Hongyan Zhou,Hui Zhang,Ji-Lin Zhou,Zonghong Zhu,Zonghong Zhu +43 more
TL;DR: In this article, the authors report optical observations of the GW source (GW 170817) in the nearby galaxy NGC 4993 using AST3, and infer from their data that the merging process ejected about 10−2 solar mass of radioactive material at a speed of up to 30% the speed of light.
Journal ArticleDOI
Cluster Difference Imaging Photometric Survey. I. Light Curves of Stars in Open Clusters from TESS Sectors 6 & 7
TL;DR: The Cluster Difference Imaging Photometric Survey (CDIPS) as mentioned in this paper uses the TESS images to find giant transiting planets with known ages and to provide light curves suitable for studies in stellar astrophysics.
Journal ArticleDOI
Precision Light Curves from TESS Full-Frame Images: A Difference Imaging Approach
TL;DR: A difference image analysis pipeline that achieves the mission specification noise floor of 60~ppm~hr, and is provided as an open-source tool at this https URL in both IDL and PYTHON.
Journal ArticleDOI
The secondary eclipses of WASP-19b as seen by the ASTEP 400 telescope from Antarctica
Lyu Abe,Ivan Gonçalves,A. Agabi,A. Alapini,Tristan Guillot,Tristan Guillot,Djamel Mékarnia,Jean-Pierre Rivet,François-Xavier Schmider,Nicolas Crouzet,Jonathan J. Fortney,Frederic Pont,M. Barbieri,Jean-Baptiste Daban,Yan Fanteï-Caujolle,Carole Gouvret,Y. Bresson,A. Roussel,S. Bonhomme,A. Robini,M. Dugué,E. Bondoux,S. Peron,P.-Y. Petit,Judit Szulágyi,Thomas Fruth,Anders Erikson,Heike Rauer,Francois Fressin,F. Valbousquet,Pierre-Eric Blanc,A. Le Van Suu,Suzanne Aigrain +32 more
TL;DR: In this article, the authors used the optimal image subtraction (OIS) algorithm to detect the secondary transits of the transiting exoplanet WASP-19b in the visible.
References
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Journal ArticleDOI
A Method for Optimal Image Subtraction
TL;DR: In this paper, a new method was proposed for image subtraction using a simple least-squares analysis using all the pixels of both images, and also showed that it is possible to fit the differential background variation at the same time.
Journal ArticleDOI
Image subtraction using a space-varying kernel
TL;DR: In this paper, the authors generalize the theory to the case of space-varying kernels and show that the CPU cost required for this new extension of the method is almost the same as for fitting a constant kernel solution.
Journal ArticleDOI
The ALADIN interactive sky atlas - A reference tool for identification of astronomical sources
François Bonnarel,Pierre Fernique,Olivier Bienaymé,Daniel Egret,Françoise Genova,M. Louys,François Ochsenbein,Marc Wenger,James G. Bartlett +8 more
TL;DR: The Aladin interactive sky atlas as mentioned in this paper provides simultaneous access to digitized images of the sky, astronomical catalogues, and databases, and facilitates direct, visual comparison of observational data at any wavelength with images of optical sky, and with reference catalogues.
Journal ArticleDOI
Real-time difference imaging analysis of moa galactic bulge observations during 2000
Ian A. Bond,Ian A. Bond,Fumio Abe,R. J. Dodd,R. J. Dodd,R. J. Dodd,John B. Hearnshaw,Morihiro Honda,Jun Jugaku,P. M. Kilmartin,P. M. Kilmartin,A. Marles,Kimiaki Masuda,Yutaka Matsubara,Yasushi Muraki,Takashi Nakamura,G. Nankivell,S. Noda,C. Noguchi,Kouji Ohnishi,Nicholas J. Rattenbury,M. Reid,To. Saito,Hiroshi Sato,Maki Sekiguchi,J. Skuljan,D. J. Sullivan,Takahiro Sumi,Mine Takeuti,Yoshiyuki Watase,S. Wilkinson,R. Yamada,T. Yanagisawa,Philip Yock +33 more
TL;DR: In this paper, the authors describe observations carried out by the MOA group of the Galactic bulge during 2000 that were designed to detect efficiently gravitational microlensing of faint stars in which the magnification is high and/or of short duration.
Journal ArticleDOI
Expanding the Realm of Microlensing Surveys with Difference Image Photometry
TL;DR: In this paper, the authors present a new technique for monitoring microlensing activity even in highly crowded fields, and use this technique to place limits on low-mass MACHOs in the haloes of M31 and the Galaxy.
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