|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
The frequency of snowline-region planets from four-years of OGLE-MOA-Wise second-generation microlensing | | Y. Shvartzvald
; D. Maoz
; A. Udalski
; T. Sumi
; M. Friedmann
; S. Kaspi
; R. Poleski
; M.K. Szymański
; J. Skowron
; S. Kozłowski
; Ł. Wyrzykowski
; P. Mróz
; P. Pietrukowicz
; G. Pietrzyński
; I. Soszyński
; K. Ulaczyk
; F. Abe
; R.K. Barry
; D.P. Bennett
; A. Bhattacharya
; I.A. Bond
; M. Freeman
; K. Inayama
; Y. Itow
; N. Koshimoto
; C.H. Ling
; K. Masuda
; A. Fukui
; Y. Matsubara
; Y. Muraki
; K. Ohnishi
; N.J. Rattenbury
; To. Saito
; D.J. Sullivan
; D. Suzuki
; P.J. Tristram
; Y. Wakiyama
; A. Yonehara
; | | Date: |
14 Oct 2015 | | Abstract: | We present a statistical analysis of the first four seasons from a
"second-generation" microlensing survey for extrasolar planets, consisting of
near-continuous time coverage of 8 deg$^2$ of the Galactic bulge by the OGLE,
MOA, and Wise microlensing surveys. During this period, 224 microlensing events
were observed by all three groups. Over 12% of the events showed a deviation
from single-lens microlensing, and for $sim$1/3 of those the anomaly is likely
caused by a planetary companion. For each of the 224 events we have performed
numerical ray-tracing simulations to calculate the detection efficiency of
possible companions as a function of companion-to-host mass ratio and
separation. Accounting for the detection efficiency, we find that
$55^{+34}_{-22}\%$ of microlensed stars host a snowline planet. Moreover, we
find that Neptunes-mass planets are $sim10$ times more common than
Jupiter-mass planets. The companion-to-host mass ratio distribution shows a
deficit at $qsim10^{-2}$, separating the distribution into two companion
populations, analogous to the stellar-companion and planet populations, seen in
radial-velocity surveys around solar-like stars. Our survey, however, which
probes mainly lower-mass stars, suggests a minimum in the distribution in the
super-Jupiter mass range, and a relatively high occurrence of brown-dwarf
companions. | | Source: | arXiv, 1510.4297 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER