Kepler K2 Campaign 9 - I. Candidate short-duration events from the first space-based survey for planetary microlensing - Archive ouverte HAL Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2021

Kepler K2 Campaign 9 - I. Candidate short-duration events from the first space-based survey for planetary microlensing

, , , , , , (1) , ,
1
I. Mcdonald
  • Function : Author
E. Kerins
  • Function : Author
R. Poleski
  • Function : Author
M. T. Penny
  • Function : Author
D. Specht
  • Function : Author
S. Mao
  • Function : Author
W. Zhu
  • Function : Author
W. Zang
  • Function : Author

Abstract

We present the first short-duration candidate microlensing events from the Kepler K2 mission. From late April to early July 2016, Campaign 9 of K2 obtained high temporal cadence observations over a 3.7 deg2 region of the Galactic bulge. Its primary objectives were to look for evidence of a free-floating planet (FFP) population using microlensing, and demonstrate the feasibility of space-based planetary microlensing surveys. Though Kepler K2 is far from optimal for microlensing, the recently developed MCPM photometric pipeline enables us to identify and model microlensing events. We describe our blind event-selection pipeline in detail and use it to recover 22 short-duration events with effective time-scales teff < 10 d previously announced by the OGLE and KMTNet ground-based surveys. We also announce five new candidate events. One of these is a caustic-crossing binary event, modelled in a companion study. The other four have very short durations (teff < 0.1 d) typical of an Earth-mass FFP population. Whilst Kepler was not designed for crowded-field photometry, the K2C9 data set clearly demonstrates the feasibility of conducting blind space-based microlensing surveys towards the Galactic bulge.
Fichier principal
Vignette du fichier
stab1377.pdf (3.72 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03672405 , version 1 (19-05-2022)

Identifiers

Cite

I. Mcdonald, E. Kerins, R. Poleski, M. T. Penny, D. Specht, et al.. Kepler K2 Campaign 9 - I. Candidate short-duration events from the first space-based survey for planetary microlensing. Monthly Notices of the Royal Astronomical Society, 2021, 505, pp.5584-5602. ⟨10.1093/mnras/stab1377⟩. ⟨insu-03672405⟩
19 View
6 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More