Multiple reference star differential imaging with VLT/SPHERE: Influence of the reference frame selection and library

被引：0

作者：

Romero, C. ^{[1
,2
]}

Milli, J. ^{[1
]}

Lagrange, A.-M. ^{[1
,3
]}

De Rosa, R. ^{[1
]}

Ertel, S. ^{[4
,5
]}

Del Burgo, C. ^{[6
,7
]}

机构：

[1] Univ. Grenoble Alpes, Cnrs, Ipag, Grenoble,38000, France

[2] European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla, Santiago de Chile,19001, Chile

[3] Lesia, Observatoire De Paris, Psl Research University, Cnrs, Sorbonne Universités, Upmc Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, France

[4] Department Of Astronomy And Steward Observatory, University Of Arizona, 933 N. Cherry Avenue, Tucson,AZ,85721-0065, United States

[5] Large Binocular Telescope Observatory, University Of Arizona, 933 N. Cherry Avenue, Tucson,AZ,85721-0065, United States

[6] Instituto De Astrofísica De Canarias, Calle Vía Láctea S/N, Tenerife, La Laguna,38205, Spain

[7] Instituto Nacional De Astrofésica, Optica Y Electrónica, Luis Enrique Erro 1, Sta. Ma. Tonantzintla, Puebla, Mexico

来源：

Astronomy and Astrophysics | 2024年 / 691卷

关键词：

Context. High-contrast imaging observations mostly rely on angular differential imaging; a successful technique for detecting point-sources; such as planets. However; in the vicinity of the star (typically below 300 mas); this technique suffers from signal self-subtraction when there is not enough field rotation. Building large libraries of reference stars from archival data later used to optimally subtract the stellar halo is a powerful technique known as reference star differential imaging (RSDI) that can overcome this limitation. Aims. We aim at investigating new methods for creating reference libraries composed of multiple stars when applying reference star differential imaging to VLT/SPHERE data. We used for that purpose a data set from the SPHERE High Angular Resolution Debris Disk Survey (SHARDDS); composed of 55 targets observed in broad-band H with the InfraRed Dual-band Imager and Spectrograph (IRDIS) during 2015-2016; with a total of ~20 000 frames. We consider HD 206893; known to host a close-in bound substellar companion HD 206893 B; as a benchmark science target to demonstrate the improved sensitivity provided by this method. Methods. We created libraries of reference frames based on different image similarity metrics: the cosine distance between descriptors created by a convolutional neural network; the Pearson correlation coefficient; the Structural Similarity Index; the Strehl ratio; and raw contrast criteria. We used principal component analysis (PCA) to subtract the stellar halo and tested various normalization options. Results. We obtained the best signal-to-noise ratio (S/N) on HD 206893 B by using the Pearson correlation coefficient (PCC) applied to an annulus between 245 and 612 mas to select reference frames. The ten reference libraries with the highest S/N on the substellar companion HD 206893 B were all based on the PCC method; outperforming other similarity metrics. While the Strehl ratio is the environment variable most correlated to the contrast; it is insufficient to select similar images. We also show that having multiple reference stars in the reference library produces better results than using a single well-chosen reference star. Conclusions. Using the Pearson correlation computed on a specific area of interest to select reference frames is a promising alternative to improve the detectability of faint point-sources when applying reference star differential imaging. In the future; reducing all the data available in the SPHERE archive using this technique might offer interesting results in the search for previously undetected planets. © The Authors 2024;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Journal article (JA)

引用

共 50 条

[31] Optimized Reference Frame Selection for Video Coding by Cloud
Li, Bin
Xu, Jizheng
Li, Houqiang
Wu, Feng
2011 IEEE 13TH INTERNATIONAL WORKSHOP ON MULTIMEDIA SIGNAL PROCESSING (MMSP), 2011,
[32] Selection of spatial frame of reference and postural control variability
B. Isableu
Théophile Ohlmann
Jacques Crémieux
Bernard Amblard
Experimental Brain Research, 1997, 114 : 584 - 589
[33] Combining reference-star and angular differential imaging for high-contrast imaging of extended sources
Juillard, S.
Christiaens, V.
Absil, O.
Stasevic, S.
Milli, J.
ASTRONOMY & ASTROPHYSICS, 2024, 688
[34] DIFFERENTIAL LEARNING AND FORGETTING AS A FUNCTION OF THE SOCIAL FRAME OF REFERENCE
KANUNGO, R
DAS, JP
JOURNAL OF ABNORMAL AND SOCIAL PSYCHOLOGY, 1960, 61 (01): : 82 - 86
[35] Fast multiple reference frame selection method for motion estimation in JVT/H.264
Li, HJ
Hsu, CT
Chen, MJ
PROCEEDINGS OF THE 2004 IEEE ASIA-PACIFIC CONFERENCE ON CIRCUITS AND SYSTEMS, VOL 1 AND 2: SOC DESIGN FOR UBIQUITOUS INFORMATION TECHNOLOGY, 2004, : 605 - 608
[36] Fast multiple reference frame selection algorithm for H.264 based on spatial correlation
Xu, Jing
Zhou, Bing
Huang, Xue-Li
Li, Wei
Cao, Lei
Tongxin Xuebao/Journal on Communications, 2010, 31 (07): : 40 - 45
[37] MULTIPLE REFERENCE FRAME ANALYSIS OF AN UNSYMMETRICAL INDUCTION MACHINE
SUDHOFF, SD
IEEE TRANSACTIONS ON ENERGY CONVERSION, 1993, 8 (03) : 425 - 432
[38] Global optimization-based reference star differential imaging for high-contrast exoplanet imaging survey
Ren, Deqing
Chen, Yili
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2021, 502 (02) : 2158 - 2171
[39] High resolution imaging with reference to a widely separated star
Baba, N
Miura, N
Norimoto, Y
Cuevas, S
RuelasMayorga, A
17TH CONGRESS OF THE INTERNATIONAL COMMISSION FOR OPTICS: OPTICS FOR SCIENCE AND NEW TECHNOLOGY, PTS 1 AND 2, 1996, 2778 : 1004 - 1005
[40] The Strategy of Datum Reference Frame Selection Based on Statistical Learning
Cao, Yanlong
Zhao, Qijian
Liu, Ting
Ren, Lifei
Yang, Jiangxin
JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING, 2018, 18 (02)

← 1 2 3 4 5 →