St Andrews Research Repository

St Andrews University Home
View Item 
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.

OGLE-2014-BLG-1186 : gravitational microlensing providing evidence for a planet orbiting the foreground star or for a close binary source?

Thumbnail
View/Open
Dominik_2019_OGLE_2014_BLG_1186_MRNAS_5608.pdf (6.383Mb)
Date
21/04/2019
Author
Dominik, M.
Bachelet, E.
Bozza, V.
Street, R. A.
Han, C.
Hundertmark, M.
Udalski, A.
Bramich, D. M.
Alsubai, K. A.
Calchi Novati, S.
Ciceri, S.
D'Ago, G.
Jaimes, R. Figuera
Haugbølle, T.
Hinse, T. C.
Horne, K.
Jørgensen, U. G.
Juncher, D.
Kains, N.
Korhonen, H.
Mancini, L.
Menzies, J.
Popovas, A.
Rabus, M.
Rahvar, S.
Scarpetta, G.
Schmidt, R.
Skottfelt, J.
Snodgrass, C.
Southworth, J.
Starkey, D.
Steele, I. A.
Surdej, J.
Tsapras, Y.
Wambsganss, J.
Wertz, O.
Pietrukowicz, P.
Szymański, M. K.
Mróz, P.
Skowron, J.
Soszyński, I.
Ulaczyk, K.
Poleski, R.
Wyrzykowski, Ł.
Kozłowski, S.
Funder
Science & Technology Facilities Council
Science & Technology Facilities Council
Grant ID
ST/R00824/1
ST/M001296/1
Keywords
Gravitational lensing: micro
Methods: data analysis
Methods: statistical
Planets and satellites: detection
(Stars:) binaries: eclipsing
Galaxy: kinematics and dynamics
QB Astronomy
QC Physics
3rd-DAS
Metadata
Show full item record
Altmetrics Handle Statistics
Altmetrics DOI Statistics
Abstract
Discussing the particularly long gravitational microlensing event OGLE-2014-BLG-1186 with a time-scale tE ∼ 300 d, we present a methodology for identifying the nature of localised deviations from single-lens point-source light curves, which ensures that (1) the claimed signal is substantially above the noise floor, (2) the inferred properties are robustly determined and their estimation is not subject to confusion with systematic noise in the photometry, (3) alternative viable solutions within the model framework are not missed. Annual parallax and binarity could be separated and robustly measured from the wing and the peak data, respectively. We find matching model light curves that involve either a binary lens or a binary source, and discover hitherto unknown model ambiguities. Our binary-lens models indicate a planet of mass M2 = (45 ± 9) M⊕, orbiting a star of mass M1 = (0.35 ± 0.06) M⊙, located at a distance DL = (1.7 ± 0.3) kpc from Earth, whereas our binary-source models suggest a brown-dwarf lens of M = (0.046 ± 0.007) M⊙, located at a distance DL = (5.7 ± 0.9) kpc, with the source potentially being a (partially) eclipsing binary involving stars predicted to be of similar colour given the ratios between the luminosities and radii. Further observations might resolve the ambiguity in the interpretation in favour of either a lens or a source binary. We experienced that close binary source stars pose a challenge for claiming the detection of planets by microlensing in events where the source passes very close to the lens star hosting the planet.
Citation
Dominik , M , Bachelet , E , Bozza , V , Street , R A , Han , C , Hundertmark , M , Udalski , A , Bramich , D M , Alsubai , K A , Calchi Novati , S , Ciceri , S , D'Ago , G , Jaimes , R F , Haugbølle , T , Hinse , T C , Horne , K , Jørgensen , U G , Juncher , D , Kains , N , Korhonen , H , Mancini , L , Menzies , J , Popovas , A , Rabus , M , Rahvar , S , Scarpetta , G , Schmidt , R , Skottfelt , J , Snodgrass , C , Southworth , J , Starkey , D , Steele , I A , Surdej , J , Tsapras , Y , Wambsganss , J , Wertz , O , Pietrukowicz , P , Szymański , M K , Mróz , P , Skowron , J , Soszyński , I , Ulaczyk , K , Poleski , R , Wyrzykowski , Ł & Kozłowski , S 2019 , ' OGLE-2014-BLG-1186 : gravitational microlensing providing evidence for a planet orbiting the foreground star or for a close binary source? ' , Monthly Notices of the Royal Astronomical Society , vol. 484 , no. 4 , pp. 5608-5632 . https://doi.org/10.1093/mnras/stz306
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stz306
ISSN
0035-8711
Type
Journal article
Rights
© 2019, the Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with the publisher's policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stz306
Description
Funding: UK STFC grant ST/R000824/1 (KH).
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/17097

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

Advanced Search

Browse

All of RepositoryCommunities & CollectionsBy Issue DateNamesTitlesSubjectsClassificationTypeFunderThis CollectionBy Issue DateNamesTitlesSubjectsClassificationTypeFunder

My Account

Login

Open Access

To find out how you can benefit from open access to research, see our library web pages and Open Access blog. For open access help contact: openaccess@st-andrews.ac.uk.

Accessibility

Read our Accessibility statement.

How to submit research papers

The full text of research papers can be submitted to the repository via Pure, the University's research information system. For help see our guide: How to deposit in Pure.

Electronic thesis deposit

Help with deposit.

Repository help

For repository help contact: Digital-Repository@st-andrews.ac.uk.

Give Feedback

Cookie policy

This site may use cookies. Please see Terms and Conditions.

Usage statistics

COUNTER-compliant statistics on downloads from the repository are available from the IRUS-UK Service. Contact us for information.

© University of St Andrews Library

University of St Andrews is a charity registered in Scotland, No SC013532.

  • Facebook
  • Twitter