2020MNRAS.498.3077W

Query : 2020MNRAS.498.3077W

2020MNRAS.498.3077W - Mon. Not. R. Astron. Soc., 498, 3077-3094 (2020/November-1)

Unsupervised machine learning for transient discovery in deeper, wider, faster light curves.

WEBB S., LOCHNER M., MUTHUKRISHNA D., COOKE J., FLYNN C., MAHABAL A., GOODE S., ANDREONI I., PRITCHARD T. and ABBOTT T.M.C.

Abstract (from CDS):

Identification of anomalous light curves within time-domain surveys is often challenging. In addition, with the growing number of wide-field surveys and the volume of data produced exceeding astronomers' ability for manual evaluation, outlier and anomaly detection is becoming vital for transient science. We present an unsupervised method for transient discovery using a clustering technique and the ASTRONOMALY package. As proof of concept, we evaluate 85 553 min-cadenced light curves collected over two ∼1.5 h periods as part of the Deeper, Wider, Faster program, using two different telescope dithering strategies. By combining the clustering technique HDBSCAN with the isolation forest anomaly detection algorithm via the visual interface of ASTRONOMALY, we are able to rapidly isolate anomalous sources for further analysis. We successfully recover the known variable sources, across a range of catalogues from within the fields, and find a further seven uncatalogued variables and two stellar flare events, including a rarely observed ultrafast flare (∼5 min) from a likely M-dwarf.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): methods: data analysis - methods: observational - techniques: photometric

Nomenclature: Tables 2+4+5: DWF JHHMMSS.sss+DDMMSS.sss N=7+6+10.

Simbad objects: 46

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Number of rows : 46
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ASAS J040237-5502.5 EB* 04 02 37.1026251672 -55 02 27.478572936   12.19 11.50 11.07   ~ 10 0
2 CRTS J040348.1-552845 EB* 04 03 48.1378681594 -55 28 44.673673763   15.027 14.408 14.579   ~ 3 0
3 ASASSN-V J040350.67-545214.6 V* 04 03 50.6716214849 -54 52 14.574578698   14.297 13.375 13.367   ~ 1 0
4 CRTS J040421.3-551639 EB* 04 04 21.4429750867 -55 16 38.630144362   15.339 14.573 14.663   ~ 2 0
5 ASASSN-V J040449.48-552715.9 EB* 04 04 49.4751358827 -55 27 15.897005788   16.850 16.117     ~ 2 0
6 CRTS J040635.9-543325 RR* 04 06 36.1715217936 -54 33 22.405739868     16.44     ~ 7 0
7 2MASS J04065766-5416258 V* 04 06 57.6666988128 -54 16 25.885206300           ~ 1 0
8 ASASSN-V J040807.97-541827.2 EB* 04 08 07.9748096254 -54 18 27.207061221   15.279 14.841 14.742   ~ 1 0
9 ASAS J040958-5520.2 Ce* 04 09 58.2522455357 -55 20 07.260731028   15.159 14.131 13.867   ~ 1 0
10 UCAC4 173-004085 EB* 04 10 06.8555308080 -55 33 02.934405720   16.19 16.05     ~ 2 0
11 CRTS J041109.9-544851 EB* 04 11 09.8813243552 -54 48 51.298103662   15.753 15.179 15.148   ~ 3 0
12 WISEA J041127.48-543854.9 EB* 04 11 27.4710123641 -54 38 54.895771937           ~ 2 0
13 CRTS J041229.7-543444 RR* 04 12 29.6697518592 -54 34 42.343173768     16.41     ~ 5 0
14 ASASSN-V J041337.83-554819.5 V* 04 13 37.8253679526 -55 48 19.527540188   16.693 15.793 15.928   ~ 1 0
15 ASAS J041436-5441.9 EB* 04 14 35.8499560705 -54 41 57.438571804   12.486 12.161 12.347 11.605 ~ 2 0
16 2MASS J10255232-3544186 EB* 10 25 52.4152904856 -35 44 18.493298160           ~ 2 0
17 2MASS J10260634-3542492 V* 10 26 06.3545633040 -35 42 49.242979584           ~ 1 0
18 CRTS J102615.2-351023 RR* 10 26 15.1785602256 -35 10 23.492348004     16.02     ~ 6 0
19 CRTS J102641.7-355130 EB* 10 26 41.7235691441 -35 51 31.301291326           ~ 3 0
20 CRTS J102712.4-353219 RR* 10 27 12.4099379112 -35 32 19.323644892     14.80     ~ 6 0
21 CRTS J102717.6-353645 EB* 10 27 17.6919092169 -35 36 46.397067829   16.869 16.334 16.306   ~ 3 0
22 CRTS J102734.7-353154 EB* 10 27 34.7152360180 -35 31 54.363387483           ~ 3 0
23 CRTS J102742.4-343933 EB* 10 27 42.4758510989 -34 39 32.727616198   17.639 16.637     ~ 3 0
24 CRTS J102906.8-360355 EB* 10 29 06.8099509954 -36 03 56.179190341   17.010 16.131 15.983   ~ 3 0
25 CRTS J102919.0-355133 EB* 10 29 19.1109567617 -35 51 33.283852541           ~ 3 0
26 CRTS J102933.7-354152 EB* 10 29 33.8120621688 -35 41 52.330744151           ~ 2 0
27 CRTS J102938.8-345416 EB* 10 29 38.9087977141 -34 54 15.827292423   15.023 14.225 14.161   ~ 4 0
28 ACO S 636 ClG 10 29 41.0957 -35 19 32.908           ~ 248 0
29 DWF J102955.559-360035.170 Er* 10 29 55.5665706024 -36 00 35.208600228           ~ 2 0
30 ASAS J103038-3558.0 EB* 10 30 37.9919598312 -35 58 00.722176572   12.70 11.85     G2/4:V+M0/K5:V 8 0
31 CRTS J103047.5-354047 RR* 10 30 47.5864606848 -35 40 46.875464184     18.58     ~ 5 0
32 CRTS J103105.8-360742 EB* 10 31 05.9292933607 -36 07 44.049352517   16.521 15.999 15.729   ~ 3 0
33 CRTS J103109.1-350150 No* 10 31 09.07 -35 01 50.3           ~ 3 0
34 CRTS J103114.5-343834 RR* 10 31 14.7143333208 -34 38 32.860281408     16.97     ~ 5 0
35 CRTS J103120.8-354209 EB* 10 31 20.9585754128 -35 42 09.022662782           ~ 3 0
36 DWF J103147.030-354553.653 * 10 31 47.0217804768 -35 45 53.642206332           ~ 1 0
37 CRTS J103157.1-351718 EB* 10 31 57.2455511046 -35 17 17.324427834           ~ 3 0
38 CRTS J103200.4-353401 EB* 10 32 00.6121271537 -35 34 00.719495573   15.618 15.177 15.084   ~ 3 0
39 CRTS J103237.3-345913 EB* 10 32 37.1855720630 -34 59 13.389128807           ~ 3 0
40 2MASS J10324098-3445232 EB* 10 32 40.9713967656 -34 45 22.934952396           ~ 2 0
41 UCAC4 273-056543 gD* 10 33 25.5355856544 -35 32 59.324918100   16.84 16.13 16.03   ~ 1 0
42 2MASS J10335529-3521241 Or* 10 33 55.2511758288 -35 21 24.215485500           ~ 2 0
43 CRTS J103425.0-350405 EB* 10 34 25.0220539105 -35 04 05.643885241   14.018 13.846 14.049   ~ 3 0
44 CRTS J103436.8-352812 EB* 10 34 36.8097382701 -35 28 12.540080164   16.948 16.313 16.176   ~ 3 0
45 CRTS J103440.2-351511 EB* 10 34 40.2529690280 -35 15 11.670789432   17.185 16.309 16.255   ~ 3 0
46 GSC 03162-00665 Er* 20 06 15.4526521026 +44 27 24.790869158   12.82 12.01 11.75   F3V 159 0

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