Journal article · Preprint article
OGLE‐2008‐BLG‐510: first automated real‐time detection of a weak microlensing anomaly – brown dwarf or stellar binary?★ : OGLE-2008-BLG-510 - weak microlensing anomaly
University of Salerno1
Université Fédérale Toulouse Midi-Pyrénées2
Okayama Astrophysical Observatory3
Chungbuk National University4
Ohio State University5
University of Exeter6
University of Manchester7
South African Astronomical Observatory8
Nagoya University9
University of Stuttgart10
National Space Institute, Technical University of Denmark11
University of St Andrews12
Astrophysics, National Space Institute, Technical University of Denmark13
IT-Department, National Space Institute, Technical University of Denmark14
Centre for Backyard Astrophysics15
Sharif University of Technology16
Institut d'Astrophysique et de Géophysique17
Max Planck Institute18
Keele University19
Liverpool John Moores University20
Instituto de Astrofísica de Andalucía21
University of Canterbury22
The University of Auckland23
Institut d’Astrophysique de Paris24
University of Notre Dame25
University of Texas at Austin26
University of Tasmania27
Lawrence Livermore National Laboratory28
University of Rijeka29
Vienna University of Technology30
California Institute of Technology31
Perth Observatory32
Space Telescope Science Institute33
University of Copenhagen34
Texas A&M University35
Korea Astronomy and Space Science Institute36
University of Canterbury Mount John Observatory37
Victoria University of Wellington38
Konan University39
Nagano National College of Technology40
Tokyo Metropolitan College of Industrial Technology41
Osaka University42
National Taiwan Normal University43
Las Cumbres Observatory Global Telescope Network, Inc.44
ESO Headquarters45
University of Warsaw46
Massey University47
Heidelberg University 48
...and 38 moreThe microlensing event OGLE‐2008‐BLG‐510 is characterized by an evident asymmetric shape of the peak, promptly detected by the Automated Robotic Terrestrial Exoplanet Microlensing Search (ARTEMiS) system in real time. The skewness of the light curve appears to be compatible both with binary‐lens and binary‐source models, including the possibility that the lens system consists of an M dwarf orbited by a brown dwarf.
The detection of this microlensing anomaly and our analysis demonstrate that: (1) automated real‐time detection of weak microlensing anomalies with immediate feedback is feasible, efficient and sensitive, (2) rather common weak features intrinsically come with ambiguities that are not easily resolved from photometric light curves, (3) a modelling approach that finds all features of parameter space rather than just the ‘favourite model’ is required and (4) the data quality is most crucial, where systematics can be confused with real features, in particular small higher order effects such as orbital motion signatures.
It moreover becomes apparent that events with weak signatures are a silver mine for statistical studies, although not easy to exploit. Clues about the apparent paucity of both brown‐dwarf companions and binary‐source microlensing events might hide here.
| Language: | English |
|---|---|
| Publisher: | Royal Astronomical Society |
| Year: | 2012 |
| Pages: | 902-918 |
| ISSN: | 13652966 and 00358711 |
| Types: | Journal article and Preprint article |
| DOI: | 10.1111/j.1365-2966.2012.21233.x |
| ORCIDs: | 0000-0001-7303-914X and Hornstrup, Allan |
